The S-Lang C Library Reference
John E. Davis <www.jedsoft.org>
Jul 4, 2018
____________________________________________________________
1. Functions dealing with UTF-8 encoded strings
1.1. SLutf8_skip_char
Synopsis
Skip past a UTF-8 encoded character
Usage
SLuchar_Type *SLutf8_skip_char (SLuchar_Type *u, SLuchar_Type
*umax)
Description
The SLutf8_skip_char function returns a pointer to the character
immediately following the UTF-8 encoded character at u. It will
make no attempt to examine the bytes at the position umax and
beyond. If the bytes at u do not represent a valid or legal
UTF-8 encoded sequence, a pointer to the byte following u will
be returned.
Notes
Unicode combining characters are treated as distinct characters
by this function.
See Also
SLutf8_skip_chars, SLutf8_bskip_char, SLutf8_strlen
1.2. SLutf8_skip_chars
Synopsis
Skip past a specified number of characters in a UTF-8 encoded
string
Usage
SLuchar_Type *SLutf8_skip_chars (u, umax, num, dnum,
ignore_combining)
SLuchar_Type *u, *umax;
unsigned int num;
unsigned int *dnum;
int ignore_combining;
Description
This functions attempts to skip forward past num UTF-8 encoded
characters at u returning the actual number skipped via the
parameter dnum. It will make no attempt to examine bytes at umax
and beyond. Unicode combining characters will not be counted if
ignore_combining is non-zero, otherwise they will be treated as
distinct characters. If the input contains an invalid or illegal
UTF-8 sequence, then each byte in the sequence will be treated
as a single character.
See Also
SLutf8_skip_char, SLutf8_bskip_chars
1.3. SLutf8_bskip_char
Synopsis
Skip backward past a UTF-8 encoded character
Usage
SLuchar_Type *SLutf8_bskip_char (SLuchar_Type *umin,
SLuchar_Type *u)
Description
The SLutf8_bskip_char skips backward to the start of the UTF-8
encoded character immediately before the position u. The
function will make no attempt to examine characters before the
position umin. UTF-8 combining characters are treated as
distinct characters.
See Also
SLutf8_bskip_chars, SLutf8_skip_char
1.4. SLutf8_bskip_chars
Synopsis
Skip backward past a specified number of UTF-8 encoded
characters
Usage
SLuchar_Type *SLutf8_bskip_chars (umin, u, num, dnum,
ignore_combining)
SLuchar_Type *umin, *u;
unsigned int num;
unsigned int *dnum;
int ignore_combining;
Description
This functions attempts to skip backward past num UTF-8 encoded
characters occurring immediately before u. It returns the the
actual number skipped via the parameter dnum. No attempt will be
made to examine the bytes occurring before umin. Unicode
combining characters will not be counted if ignore_combining is
non-zero, otherwise they will be treated as distinct characters.
If the input contains an invalid or illegal UTF-8 sequence, then
each byte in the sequence will be treated as a single character.
See Also
SLutf8_skip_char, SLutf8_bskip_chars
1.5. SLutf8_decode
Synopsis
Decode a UTF-8 encoded character sequence
Usage
SLuchar_Type *SLutf8_decode (u, umax, w, nconsumedp
SLuchar_Type *u, *umax;
SLwchar_Type *w;
unsigned int *nconsumedp;
Description
The SLutf8_decode function decodes the UTF-8 encoded character
occurring at u and returns the decoded character via the
parameter w. No attempt will be made to examine the bytes at
umax and beyond. If the parameter nconsumedp is non-NULL, then
the number of bytes consumed by the function will be returned to
it. If the sequence at u is invalid or illegal, the function
will return NULL and with the number of bytes consumed by the
function equal to the size of the invalid sequence. Otherwise
the function will return a pointer to byte following encoded
sequence.
See Also
SLutf8_decode, SLutf8_strlen, SLutf8_skip_char
1.6. SLutf8_encode
Synopsis
UTF-8 encode a character
Usage
SLuchar_Type *SLutf8_encode (w, u, ulen)
SLwchar_Type w;
SLuchar_Type *u;
unsigned int ulen;
Description
This function UTF-8 encodes the Unicode character represented by
w and stored the encoded representation in the buffer of size
ulen bytes at u. The function will return NULL if the size of
the buffer is too small to represent the UTF-8 encoded
character, otherwise it will return a pointer to the byte
following encoded representation.
Notes
This function does not null terminate the resulting byte
sequence. The function SLutf8_encode_null_terminate may be used
for that purpose.
To guarantee that the buffer is large enough to hold the encoded
bytes, its size should be at least SLUTF8_MAX_BLEN bytes.
The function will encode illegal Unicode characters, i.e.,
characters in the range 0xD800-0xFFFF (the UTF-16 surrogates)
and 0xFFFE-0xFFFF.
See Also
SLutf8_decode, SLutf8_encode_bytes, SLutf8_encode_null_terminate
1.7. SLutf8_strlen
Synopsis
Determine the number of characters in a UTF-8 sequence
Usage
unsigned int SLutf8_strlen (SLuchar_Type *s, int
ignore_combining)
Description
This function may be used to determine the number of characters
represented by the null-terminated UTF-8 byte sequence. If the
ignore_combining parameter is non-zero, then Unicode combining
characters will not be counted.
See Also
SLutf8_skip_chars, SLutf8_decode
1.8. SLutf8_extract_utf8_char
Synopsis
Extract a UTF-8 encoded character
Usage
SLuchar_Type *SLutf8_extract_utf8_char (u, umax, buf)
SLuchar_Type *u, *umax, *buf;
Description
This function extracts the bytes representing UTF-8 encoded
character at u and places them in the buffer buf, and then null
terminates the result. The buffer is assumed to consist of at
least SLUTF8_MAX_BLEN+1 bytes, where the extra byte may be
necessary for null termination. No attempt will be made to
examine the characters at umax and beyond. If the byte-sequence
at u is an illegal or invalid UTF-8 sequence, then the byte at u
will be copied to the buffer. The function returns a pointer to
the byte following copied bytes.
Notes
One may think of this function as the single byte analogue of
if (u < umax)
{
buf[0] = *u++;
buf[1] = 0;
}
See Also
SLutf8_decode, SLutf8_skip_char
1.9. SLutf8_encode_null_terminate
Synopsis
UTF-8 encode a character and null terminate the result
Usage
SLuchar_Type *SLutf8_encode_null_terminate (w, buf)
SLwchar_Type w;
SLuchar_Type *buf;
Description
This function has the same functionality as SLutf8_encode,
except that it also null terminates the encoded sequences. The
buffer buf, where the encoded sequence is placed, is assumed to
consist of at least SLUTF8_MAX_BLEN+1 bytes.
See Also
SLutf8_encode
1.10. SLutf8_strup
Synopsis
Uppercase a UTF-8 encoded string
Usage
SLuchar_Type *SLutf8_strup (SLuchar_Type *u, SLuchar_Type *umax)
Description
The SLutf8_strup function returns the uppercase equivalent of
UTF-8 encoded sequence of umax-u bytes at u. The result will be
returned as a null-terminated SLstring and should be freed with
SLang_free_slstring when it is nolonger needed. If the function
encounters an invalid of illegal byte sequence, then the byte-
sequence will be copied as as-is.
See Also
SLutf8_strlow, SLwchar_toupper
1.11. SLutf8_strlo
Synopsis
Lowercase a UTF-8 encoded string
Usage
SLuchar_Type *SLutf8_strlo (SLuchar_Type *u, SLuchar_Type *umax)
Description
The SLutf8_strlo function returns the lowercase equivalent of
UTF-8 encoded sequence of umax-u bytes at u. The result will be
returned as a null-terminated SLstring and should be freed with
SLang_free_slstring when it is nolonger needed. If the function
encounters an invalid of illegal byte sequence, then the byte-
sequence will be copied as as-is.
See Also
SLutf8_strlow, SLwchar_toupper
1.12. SLutf8_subst_wchar
Synopsis
Replace a character in a UTF-8 encoded string
Usage
SLstr_Type *SLutf8_subst_wchar (u, umax, wch,
nth,ignore_combining)
SLuchar_Type *u, *umax;
SLwchar_Type wch;
unsigned int nth;
int ignore_combining;
Description
The SLutf8_subst_wchar function replaces the UTF-8 sequence
representing the nth character of u by the UTF-8 representation
of the character wch. If the value of the ignore_combining
parameter is non-zero, then combining characters will not be
counted when computing the position of the nth character. In
addition, if the nth character contains any combining
characters, then the byte-sequence associated with those
characters will also be replaced.
Since the byte sequence representing wch could be longer than
the sequence of the nth character, the function returns a new
copy of the resulting string as an SLSTRING. Hence, the calling
function should call SLang_free_slstring when the result is
nolonger needed.
See Also
SLutf8_strup, SLutf8_strlow, SLutf8_skip_chars, SLutf8_strlen
1.13. SLutf8_compare
Synopsis
Compare two UTF-8 encoded sequences
Usage
int SLutf8_compare (a, amax, b, bmax, nchars, case_sensitive)
SLuchar_Type *a, *amax;
SLuchar_Type *b, *bmax;
unsigned int nchars;
int case_sensitive;
Description
This function compares nchars of one UTF-8 encoded character
sequence to another by performing a character by character
comparison. The function returns 0, +1, or -1 according to
whether the string a is is equal to, greater than, or less than
the string at b. At most nchars characters will be tested. The
parameters amax and bmax serve as upper boundaries of the
strings a and b, resp.
If the value of the case_sensitive parameter is non-zero, then a
case-sensitive comparison will be performed, otherwise
characters will be compared in a case-insensitive manner.
Notes
For case-sensitive comparisons, this function is analogous to
the standard C library's strncmp function. However,
SLutf8_compare can also cope with invalid or illegal UTF-8
sequences.
See Also
SLutf8_strup, SLutf8_strlen, SLutf8_strlen
2. Character classification functions
2.1. SLwchar_toupper
Synopsis
Uppercase a Unicode character
Usage
SLwchar_Type SLwchar_toupper (SLwchar_Type wc)
Description
SLwchar_toupper returns the uppercase equivalent of the
specified character.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_tolower, SLwchar_isupper, SLutf8_strup
2.2. SLwchar_tolower
Synopsis
Lowercase a Unicode character
Usage
SLwchar_Type SLwchar_tolower (SLwchar_Type wc)
Description
SLwchar_tolower returns the lowercase equivalent of the
specified character.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_toupper, SLwchar_islower, SLutf8_strlow
2.3. SLwchar_wcwidth
Synopsis
Determine the displayable width of a wide character
Usage
int SLwchar_wcwidth (SLwchar_Type wc)
Description
This function returns the number of columns necessary to display
the specified Unicode character. Combining characters are meant
to be combined with other characters and, as such, have 0 width.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isspace, SLwchar_iscntrl
2.4. SLwchar_isalnum
Synopsis
Determine if a Unicode character is alphanumeric
Usage
int SLwchar_isalnum (SLwchar_Type wc)
Description
SLwchar_isalnum returns a non-zero value if the Unicode
character is alphanumeric, otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isalpha, SLwchar_isdigit, SLwchar_iscntrl
2.5. SLwchar_isalpha
Synopsis
Determine if a Unicode character is an alphabetic character
Usage
int SLwchar_isalpha (SLwchar_Type wc)
Description
SLwchar_isalpha returns a non-zero value if the Unicode
character is alphabetic, otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isalnum, SLwchar_isalpha, SLwchar_isdigit,
SLwchar_iscntrl
2.6. SLwchar_isblank
Synopsis
Determine if a Unicode character is a blank
Usage
int SLwchar_isblank (SLwchar_Type wc)
Description
SLwchar_isblank returns a non-zero value if the Unicode
character is a blank one (space or tab), otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit,
SLwchar_iscntrl
2.7. SLwchar_iscntrl
Synopsis
Determine if a Unicode character is a control character
Usage
int SLwchar_iscntrl (SLwchar_Type wc)
Description
SLwchar_isblank returns a non-zero value if the Unicode
character is a control character, otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit,
SLwchar_isprint
2.8. SLwchar_isdigit
Synopsis
Determine if a Unicode character is a digit
Usage
int SLwchar_isdigit (SLwchar_Type wc)
Description
This function returns a non-zero value if the specified Unicode
character is a digit, otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isspace, SLwchar_isalpha, SLwchar_isxdigit,
SLwchar_isprint
2.9. SLwchar_isgraph
Synopsis
Determine if a non-space Unicode character is printable
Usage
int SLwchar_isgraph (SLwchar_Type wc)
Description
This function returns a non-zero value if the specified Unicode
character is a non-space printable character, otherwise it
returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit,
SLwchar_isprint
2.10. SLwchar_islower
Synopsis
Determine if a Unicode character is alphanumeric
Usage
int SLwchar_islower (SLwchar_Type wc)
Description
This function returns a non-zero value if the specified Unicode
character is a lowercase one, otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isupper, SLwchar_isspace, SLwchar_isalpha,
SLwchar_isdigit, SLwchar_iscntrl
2.11. SLwchar_isprint
Synopsis
Determine if a Unicode character is printable
Usage
int SLwchar_isprint (SLwchar_Type wc)
Description
This function returns a non-zero value if the specified Unicode
character is a printable one (includes space), otherwise it
returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isgraph, SLwchar_isspace, SLwchar_isalpha,
SLwchar_isdigit
2.12. SLwchar_ispunct
Synopsis
Determine if a Unicode character is a punctuation character
Usage
int SLwchar_ispunct (SLwchar_Type wc)
Description
This function returns a non-zero value if the specified Unicode
character is a punctuation character, otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit,
SLwchar_isprint
2.13. SLwchar_isspace
Synopsis
Determine if a Unicode character is a whitespace character
Usage
int SLwchar_isspace (SLwchar_Type wc)
Description
This function returns a non-zero value if the specified Unicode
character is a whitespace character, otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isblank, SLwchar_isalpha, SLwchar_isdigit,
SLwchar_ispunct
2.14. SLwchar_isupper
Synopsis
Determine if a Unicode character is uppercase
Usage
int SLwchar_isupper (SLwchar_Type wc)
Description
This function returns a non-zero value if the specified Unicode
character is an uppercase character, otherwise it returns 0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_islower, SLwchar_isspace, SLwchar_isalpha,
SLwchar_isdigit
2.15. SLwchar_isxdigit
Synopsis
Determine if a Unicode character is a hexidecimal digit
Usage
int SLwchar_isxdigit (SLwchar_Type wc)
Description
This function returns a non-zero value if the specified Unicode
character is a hexadecimal digit character, otherwise it returns
0.
Notes
If the library is not in UTF-8 mode, then the current locale
will be used.
See Also
SLwchar_isdigit, SLwchar_isspace, SLwchar_isalpha,
SLwchar_ispunct
3. SLsearch interface Functions
3.1. SLsearch_new
Synopsis
Create an SLsearch_Type object
Usage
SLsearch_Type *SLsearch_new (SLuchar_Type *key, int
search_flags)
Description
The SLsearch_new function instantiates an SLsearch_Type object
for use in ordinary searches (non-regular expression) by the
functions in the SLsearch interface. The first argument key is a
pointer to a null terminated string that specifies the character
string to be searched. This character string may not contain any
embedded null characters.
The second argument search_flags is used to specify how the
search is to be performed. It is a bit-mapped integer whose
value is constructed by the bitwise-or of zero or more of the
following:
SLSEARCH_CASELESS
The search shall be performed in a case-insensitive manner.
SLSEARCH_UTF8
Both the search string and the text to be searched is UTF-8
encoded.
Upon sucess, the function returns the newly created object, and
NULL otherwise. When the search object is nolonger needed, it
should be freed via the SLsearch_delete function.
See Also
SLsearch_delete, SLsearch_forward, SLsearch_backward
3.2. SLsearch_delete
Synopsis
Free the memory associated with a SLsearch_Type object
Usage
SLsearch_delete (SLsearch_Type *)
Description
This function should be called to free the memory associated
with a SLsearch_Type object created by the SLsearch_new
function. Failure to do so will result in a memory leak.
See Also
SLsearch_new, SLsearch_forward, SLsearch_backward
3.3. SLsearch_forward
Synopsis
Search forward in a buffer
Usage
SLuchar_Type SLsearch_forward (st, pmin, pmax)
SLsearch_Type *st;
SLuchar_Type *pmin, *pmax;
Description
The SLsearch_forward function searches forward in the buffer
defined by the pointers pmin and pmax. The starting point for
the search is at the beginning of the buffer at pmin. At no
point will the bytes at pmax and beyond be examined. The first
parameter st, obtained by a prior call to SLsearch_new,
specifies the object to found. be found from a previous call to
SLsearch_new.
If the object was found, the pointer to the beginning of it will
be returned. Otherwise, SLsearch_forward will return NULL. The
length of the object may be obtained via the SLsearch_match_len
function.
Notes
This function uses the Boyer-Moore search algorithm when
possible.
See Also
SLsearch_new, SLsearch_backward, SLsearch_delete,
SLsearch_match_len
3.4. SLsearch_backward
Synopsis
Search backward in a buffer
Usage
SLuchar_Type SLsearch_forward (st, pmin, pstart, pmax)
SLsearch_Type *st;
SLuchar_Type *pmin, *pstart, *pmax;
Description
The SLsearch_forward function searches backward in the buffer
defined by the pointers pmin and pmax. The starting point for
the search is at the position pstart. At no point will the bytes
at pmax and beyond be examined. The first parameter st, obtained
by a prior call to SLsearch_new, specifies the object to found.
If the object was found, the pointer to the beginning of it will
be returned. Otherwise, SLsearch_forward will return NULL. The
length of the object may be obtained via the SLsearch_match_len
function.
Notes
This function uses the Boyer-Moore search algorithm when
possible.
It is possible for the end of match to appear after the point
where the search began (pstart).
See Also
SLsearch_new, SLsearch_forward, SLsearch_delete,
SLsearch_match_len
3.5. SLsearch_match_len
Synopsis
Get the length of the previous match
Usage
unsigned int SLsearch_match_len (SLsearch_Type *st)
Description
The SLsearch_match_len function returns the length of the match
from the most recent search involving the specified
SLsearch_Type object. If the most recent search was
unsuccessful, the function will return 0.
See Also
SLsearch_forward, SLsearch_backward, SLsearch_new,
SLsearch_delete
4. Screen Management (SLsmg) functions
4.1. SLsmg_fill_region
Synopsis
Fill a rectangular region with a character
Usage
void SLsmg_fill_region (r, c, nr, nc, ch)
int r
int c
unsigned int nr
unsigned int nc
unsigned char ch
Description
The SLsmg_fill_region function may be used to a rectangular
region with the character ch in the current color. The
rectangle's upper left corner is at row r and column c, and
spans nr rows and nc columns. The position of the virtual cursor
will be left at (r, c).
See Also
SLsmg_write_char, SLsmg_set_color
4.2. SLsmg_set_char_set
Synopsis
Turn on or off line drawing characters
Usage
void SLsmg_set_char_set (int a);
Description
SLsmg_set_char_set may be used to select or deselect the line
drawing character set as the current character set. If a is non-
zero, the line drawing character set will be selected.
Otherwise, the standard character set will be selected.
Notes
There is no guarantee that this function will actually enable
the use of line drawing characters. All it does is cause
subsequent characters to be rendered using the terminal's
alternate character set. Such character sets usually contain
line drawing characters.
See Also
SLsmg_write_char, SLtt_get_terminfo
4.3. int SLsmg_Scroll_Hash_Border;
Synopsis
Set the size of the border for the scroll hash
Usage
int SLsmg_Scroll_Hash_Border = 0;
Description
This variable may be used to ignore the characters that occur at
the beginning and the end of a row when performing the hash
calculation to determine whether or not a line has scrolled. The
default value is zero which means that all the characters on a
line will be used.
See Also
SLsmg_refresh
4.4. SLsmg_suspend_smg
Synopsis
Suspend screen management
Usage
int SLsmg_suspend_smg (void)
Description
SLsmg_suspend_smg can be used to suspend the state of the screen
management facility during suspension of the program. Use of
this function will reset the display back to its default state.
The funtion SLsmg_resume_smg should be called after suspension.
It returns zero upon success, or -1 upon error.
This function is similar to SLsmg_reset_smg except that the
state of the display prior to calling SLsmg_suspend_smg is
saved.
See Also
SLsmg_resume_smg, SLsmg_reset_smg
4.5. SLsmg_resume_smg
Synopsis
Resume screen management
Usage
int SLsmg_resume_smg (void)
Description
SLsmg_resume_smg should be called after SLsmg_suspend_smg to
redraw the display exactly like it was before SLsmg_suspend_smg
was called. It returns zero upon success, or -1 upon error.
See Also
SLsmg_suspend_smg
4.6. SLsmg_erase_eol
Synopsis
Erase to the end of the row
Usage
void SLsmg_erase_eol (void);
Description
SLsmg_erase_eol erases all characters from the current position
to the end of the line. The newly created space is given the
color of the current color. This function has no effect on the
position of the virtual cursor.
See Also
SLsmg_gotorc, SLsmg_erase_eos, SLsmg_fill_region
4.7. SLsmg_gotorc
Synopsis
Move the virtual cursor
Usage
void SLsmg_gotorc (int r, int c)
Description
The SLsmg_gotorc function moves the virtual cursor to the row r
and column c. The first row and first column is specified by r =
0 and c = 0.
See Also
SLsmg_refresh
4.8. SLsmg_erase_eos
Synopsis
Erase to the end of the screen
Usage
void SLsmg_erase_eos (void);
Description
The SLsmg_erase_eos is like SLsmg_erase_eol except that it
erases all text from the current position to the end of the
display. The current color will be used to set the background of
the erased area.
See Also
SLsmg_erase_eol
4.9. SLsmg_reverse_video
Synopsis
Set the current color to 1
Usage
void SLsmg_reverse_video (void);
Description
This function is nothing more than SLsmg_set_color(1).
See Also
SLsmg_set_color
4.10. SLsmg_set_color (int)
Synopsis
Set the current color
Usage
void SLsmg_set_color (int c);
Description
SLsmg_set_color is used to set the current color. The parameter
c is really a color object descriptor. Actual foreground and
background colors as well as other visual attributes may be
associated with a color descriptor via the SLtt_set_color
function.
Example
This example defines color 7 to be green foreground on black
background and then displays some text in this color:
SLtt_set_color (7, NULL, "green", "black");
SLsmg_set_color (7);
SLsmg_write_string ("Hello");
SLsmg_refresh ();
Notes
It is important to understand that the screen managment routines
know nothing about the actual colors associated with a color
descriptor. Only the descriptor itself is used by the SLsmg
routines. The lower level SLtt interface converts the color
descriptors to actual colors. Thus
SLtt_set_color (7, NULL, "green", "black");
SLsmg_set_color (7);
SLsmg_write_string ("Hello");
SLtt_set_color (7, NULL, "red", "blue");
SLsmg_write_string ("World");
SLsmg_refresh ();
will result in "hello" displayed in red on blue and not green on
black.
See Also
SLtt_set_color, SLtt_set_color_object
4.11. SLsmg_normal_video
Synopsis
Set the current color to 0
Usage
void SLsmg_normal_video (void);
Description
SLsmg_normal_video sets the current color descriptor to 0.
See Also
SLsmg_set_color
4.12. SLsmg_printf
Synopsis
Format a string on the virtual display
Usage
void SLsmg_printf (char *fmt, ...)
Description
SLsmg_printf format a printf style variable argument list and
writes it on the virtual display. The virtual cursor will be
moved to the end of the string.
See Also
SLsmg_write_string, SLsmg_vprintf
4.13. SLsmg_vprintf
Synopsis
Format a string on the virtual display
Usage
void SLsmg_vprintf (char *fmt, va_list ap)
Description
SLsmg_vprintf formats a string in the manner of vprintf and
writes the result to the display. The virtual cursor is advanced
to the end of the string.
See Also
SLsmg_write_string, SLsmg_printf
4.14. SLsmg_write_string
Synopsis
Write a character string on the display
Usage
void SLsmg_write_string (char *s)
Description
The function SLsmg_write_string displays the string s on the
virtual display at the current position and moves the position
to the end of the string.
See Also
SLsmg_printf, SLsmg_write_nstring
4.15. SLsmg_write_nstring
Synopsis
Write the first n characters of a string on the display
Usage
void SLsmg_write_nstring (char *s, unsigned int n);
Description
SLsmg_write_nstring writes the first n characters of s to this
virtual display. If the length of the string s is less than n,
the spaces will used until n characters have been written. s can
be NULL, in which case n spaces will be written.
See Also
SLsmg_write_string, SLsmg_write_nchars
4.16. SLsmg_write_char
Synopsis
Write a character to the virtual display
Usage
void SLsmg_write_char (char ch);
Description
SLsmg_write_char writes the character ch to the virtual display.
See Also
SLsmg_write_nchars, SLsmg_write_string
4.17. SLsmg_write_nchars
Synopsis
Write n characters to the virtual display
Usage
void SLsmg_write_nchars (char *s, unsigned int n);
Description
SLsmg_write_nchars writes at most n characters from the string s
to the display. If the length of s is less than n, the whole
length of the string will get written.
This function differs from SLsmg_write_nstring in that
SLsmg_write_nstring will pad the string to write exactly n
characters. SLsmg_write_nchars does not perform any padding.
See Also
SLsmg_write_nchars, SLsmg_write_nstring
4.18. SLsmg_write_wrapped_string
Synopsis
Write a string to the display with wrapping
Usage
void SLsmg_write_wrapped_string (s, r, c, nr, nc, fill)
char *s
int r, c
unsigned int nr, nc
int fill
Description
SLsmg_write_wrapped_string writes the string s to the virtual
display. The string will be confined to the rectangular region
whose upper right corner is at row r and column c, and consists
of nr rows and nc columns. The string will be wrapped at the
boundaries of the box. If fill is non-zero, the last line to
which characters have been written will get padded with spaces.
Notes
This function does not wrap on word boundaries. However, it will
wrap when a newline charater is encountered.
See Also
SLsmg_write_string
4.19. SLsmg_cls
Synopsis
Clear the virtual display
Usage
void SLsmg_cls (void)
Description
SLsmg_cls erases the virtual display using the current color.
This will cause the physical display to get cleared the next
time SLsmg_refresh is called.
Notes
This function is not the same as
SLsmg_gotorc (0,0); SLsmg_erase_eos ();
since these statements do not guarantee that the physical screen
will get cleared.
See Also
SLsmg_refresh, SLsmg_erase_eos
4.20. SLsmg_refresh
Synopsis
Update physical screen
Usage
void SLsmg_refresh (void)
Description
The SLsmg_refresh function updates the physical display to look
like the virtual display.
See Also
SLsmg_suspend_smg, SLsmg_init_smg, SLsmg_reset_smg
4.21. SLsmg_touch_lines
Synopsis
Mark lines on the virtual display for redisplay
Usage
void SLsmg_touch_lines (int r, unsigned int nr)
Description
SLsmg_touch_lines marks the nr lines on the virtual display
starting at row r for redisplay upon the next call to
SLsmg_refresh.
Notes
This function should rarely be called, if ever. If you find that
you need to call this function, then your application should be
modified to properly use the SLsmg screen management routines.
This function is provided only for curses compatibility.
See Also
SLsmg_refresh
4.22. SLsmg_init_smg
Synopsis
Initialize the SLsmg routines
Usage
int SLsmg_init_smg (void)
Description
The SLsmg_init_smg function initializes the SLsmg screen
management routines. Specifically, this function allocates space
for the virtual display and calls SLtt_init_video to put the
terminal's physical display in the proper state. It is up to the
caller to make sure that the SLtt routines are initialized via
SLtt_get_terminfo before calling SLsmg_init_smg.
This function should also be called any time the size of the
physical display has changed so that it can reallocate a new
virtual display to match the physical display.
It returns zero upon success, or -1 upon failure.
See Also
SLsmg_reset_smg
4.23. SLsmg_reset_smg
Synopsis
Reset the SLsmg routines
Usage
int SLsmg_reset_smg (void);
Description
SLsmg_reset_smg resets the SLsmg screen management routines by
freeing all memory allocated while it was active. It also calls
SLtt_reset_video to put the terminal's display in it default
state.
See Also
SLsmg_init_smg
4.24. SLsmg_char_at
Synopsis
Get the character at the current position on the virtual display
Usage
unsigned short SLsmg_char_at(void)
Description
The SLsmg_char_at function returns the character and its color
at the current position on the virtual display.
See Also
SLsmg_read_raw, SLsmg_write_char
4.25. SLsmg_set_screen_start
Synopsis
Set the origin of the virtual display
Usage
void SLsmg_set_screen_start (int *r, int *c)
Description
SLsmg_set_screen_start sets the origin of the virtual display to
the row *r and the column *c. If either r or c is NULL, then the
corresponding value will be set to 0. Otherwise, the location
specified by the pointers will be updated to reflect the old
origin.
See slang/demo/pager.c for how this function may be used to
scroll horizontally.
See Also
SLsmg_init_smg
4.26. SLsmg_draw_hline
Synopsis
Draw a horizontal line
Usage
void SLsmg_draw_hline (unsigned int len)
Description
The SLsmg_draw_hline function draws a horizontal line of length
len on the virtual display. The position of the virtual cursor
is left at the end of the line.
See Also
SLsmg_draw_vline
4.27. SLsmg_draw_vline
Synopsis
Draw a vertical line
Usage
void SLsmg_draw_vline (unsigned int len);
Description
The SLsmg_draw_vline function draws a vertical line of length
len on the virtual display. The position of the virtual cursor
is left at the end of the line.
See Also
??
4.28. SLsmg_draw_object
Synopsis
Draw an object from the alternate character set
Usage
void SLsmg_draw_object (int r, int c, unsigned char obj)
Description
The SLsmg_draw_object function may be used to place the object
specified by obj at row r and column c. The object is really a
character from the alternate character set and may be specified
using one of the following constants:
SLSMG_HLINE_CHAR Horizontal line
SLSMG_VLINE_CHAR Vertical line
SLSMG_ULCORN_CHAR Upper left corner
SLSMG_URCORN_CHAR Upper right corner
SLSMG_LLCORN_CHAR Lower left corner
SLSMG_LRCORN_CHAR Lower right corner
SLSMG_CKBRD_CHAR Checkboard character
SLSMG_RTEE_CHAR Right Tee
SLSMG_LTEE_CHAR Left Tee
SLSMG_UTEE_CHAR Up Tee
SLSMG_DTEE_CHAR Down Tee
SLSMG_PLUS_CHAR Plus or Cross character
See Also
SLsmg_draw_vline, SLsmg_draw_hline, SLsmg_draw_box
4.29. SLsmg_draw_box
Synopsis
Draw a box on the virtual display
Usage
void SLsmg_draw_box (int r, int c, unsigned int dr, unsigned int
dc)
Description
SLsmg_draw_box uses the SLsmg_draw_hline and SLsmg_draw_vline
functions to draw a rectangular box on the virtual display. The
box's upper left corner is placed at row r and column c. The
width and length of the box is specified by dc and dr,
respectively.
See Also
SLsmg_draw_vline, SLsmg_draw_hline, SLsmg_draw_object
4.30. SLsmg_set_color_in_region
Synopsis
Change the color of a specifed region
Usage
void SLsmg_set_color_in_region (color, r, c, dr, dc)
int color;
int r, c;
unsigned int dr, dc;
Description
SLsmg_set_color_in_region may be used to change the color of a
rectangular region whose upper left corner is given by (r,c),
and whose width and height is given by dc and dr, respectively.
The color of the region is given by the color parameter.
See Also
SLsmg_draw_box, SLsmg_set_color
4.31. SLsmg_get_column
Synopsis
Get the column of the virtual cursor
Usage
int SLsmg_get_column(void);
Description
The SLsmg_get_column function returns the current column of the
virtual cursor on the virtual display.
See Also
SLsmg_get_row, SLsmg_gotorc
4.32. SLsmg_get_row
Synopsis
Get the row of the virtual cursor
Usage
int SLsmg_get_row(void);
Description
The SLsmg_get_row function returns the current row of the
virtual cursor on the virtual display.
See Also
SLsmg_get_column, SLsmg_gotorc
4.33. SLsmg_forward
Synopsis
Move the virtual cursor forward n columns
Usage
void SLsmg_forward (int n);
Description
The SLsmg_forward function moves the virtual cursor forward n
columns.
See Also
SLsmg_gotorc
4.34. SLsmg_write_color_chars
Synopsis
Write characters with color descriptors to virtual display
Usage
void SLsmg_write_color_chars (unsigned short *s, unsigned int
len)
Description
The SLsmg_write_color_chars function may be used to write len
characters, each with a different color descriptor to the
virtual display. Each character and its associated color are
encoded as an unsigned short such that the lower eight bits form
the character and the next eight bits form the color.
See Also
SLsmg_char_at, SLsmg_write_raw
4.35. SLsmg_read_raw
Synopsis
Read characters from the virtual display
Usage
unsigned int SLsmg_read_raw (SLsmg_Char_Type *buf, unsigned int
len)
Description
SLsmg_read_raw attempts to read len characters from the current
position on the virtual display into the buffer specified by
buf. It returns the number of characters actually read. This
number will be less than len if an attempt is made to read past
the right margin of the display.
Notes
The purpose of the pair of functions, SLsmg_read_raw and
SLsmg_write_raw, is to permit one to copy the contents of one
region of the virtual display to another region.
See Also
SLsmg_char_at, SLsmg_write_raw
4.36. SLsmg_write_raw
Synopsis
Write characters directly to the virtual display
Usage
unsigned int SLsmg_write_raw (unsigned short *buf, unsigned int
len)
Description
The SLsmg_write_raw function attempts to write len characters
specified by buf to the display at the current position. It
returns the number of characters successfully written, which
will be less than len if an attempt is made to write past the
right margin.
Notes
The purpose of the pair of functions, SLsmg_read_raw and
SLsmg_write_raw, is to permit one to copy the contents of one
region of the virtual display to another region.
See Also
SLsmg_read_raw
5. Functions that deal with the interpreter
5.1. SLallocate_load_type
Synopsis
Allocate a SLang_Load_Type object
Usage
SLang_Load_Type *SLallocate_load_type (char *name)
Description
The SLallocate_load_type function allocates and initializes
space for a SLang_Load_Type object and returns it. Upon failure,
the function returns NULL. The parameter name must uniquely
identify the object. For example, if the object represents a
file, then name could be the absolute path name of the file.
See Also
SLdeallocate_load_type, SLang_load_object
5.2. SLdeallocate_load_type
Synopsis
Free a SLang_Load_Type object
Usage
void SLdeallocate_load_type (SLang_Load_Type *slt)
Description
This function frees the memory associated with a SLang_Load_Type
object that was acquired from a call to the SLallocate_load_type
function.
See Also
SLallocate_load_type, SLang_load_object
5.3. SLang_load_object
Synopsis
Load an object into the interpreter
Usage
int SLang_load_object (SLang_Load_Type *obj)
Description
The function SLang_load_object is a generic function that may be
used to loaded an object of type SLang_Load_Type into the
interpreter. For example, the functions SLang_load_file and
SLang_load_string are wrappers around this function to load a
file and a string, respectively.
See Also
SLang_load_file, SLang_load_string, SLallocate_load_type
5.4. SLclass_allocate_class
Synopsis
Allocate a class for a new data type
Usage
SLang_Class_Type *SLclass_allocate_class (char *name)
Description
The purpose of this function is to allocate and initialize space
that defines a new data type or class called name. If
successful, a pointer to the class is returned, or upon failure
the function returns NULL.
This function does not automatically create the new data type.
Callback functions must first be associated with the data type
via functions such as SLclass_set_push_function, and the data
type must be registered with the interpreter via
SLclass_register_class. See the S-Lang library programmer's
guide for more information.
See Also
SLclass_register_class, SLclass_set_push_function
5.5. SLclass_register_class
Synopsis
Register a new data type with the interpreter
Usage
int SLclass_register_class (cl, type, sizeof_type, class_type)
SLang_Class_Type *cl
SLtype type
unsigned int sizeof_type
SLclass_Type class_type
Description
The SLclass_register_class function is used to register a new
class or data type with the interpreter. If successful, the
function returns 0, or upon failure, it returns -1.
The first parameter, cl, must have been previously obtained via
the SLclass_allocate_class function.
The second parameter, type specifies the data type of the new
class. If set to SLANG_VOID_TYPE then the library will
automatically allocate an unused value for the class (the
allocated value can then be found using the SLclass_get_class_id
function), otherwise a value greater than 255 should be used.
The values in the range 0-255 are reserved for internal use by
the library.
The size that the data type represents in bytes is specified by
the third parameter, sizeof_type. This value should not be
confused with the sizeof the structure that represents the data
type, unless the data type is of class SLANG_CLASS_TYPE_VECTOR
or SLANG_CLASS_TYPE_SCALAR. For pointer objects, the value of
this parameter is just sizeof(void *).
The final parameter specifies the class type of the data type.
It must be one of the values:
SLANG_CLASS_TYPE_SCALAR
SLANG_CLASS_TYPE_VECTOR
SLANG_CLASS_TYPE_PTR
SLANG_CLASS_TYPE_MMT
The SLANG_CLASS_TYPE_SCALAR indicates that the new data type is a
scalar. Examples of scalars in SLANG_INT_TYPE and SLANG_DOU-
BLE_TYPE.
Setting class_type to SLANG_CLASS_TYPE_VECTOR implies that the new
data type is a vector, or a 1-d array of scalar types. An example
of a data type of this class is the SLANG_COMPLEX_TYPE, which
represents complex numbers.
SLANG_CLASS_TYPE_PTR specifies the data type is of a pointer type.
Examples of data types of this class include SLANG_STRING_TYPE and
SLANG_ARRAY_TYPE. Such types must provide for their own memory
management.
Data types of class SLANG_CLASS_TYPE_MMT are pointer types except
that the memory management, i.e., creation and destruction of the
type, is handled by the interpreter. Such a type is called a memory
managed type. An example of this data type is the
SLANG_FILEPTR_TYPE.
Notes
See the S-Lang Library C Programmer's Guide for more
information.
See Also
SLclass_allocate_class, SLclass_get_class_id
5.6. SLclass_set_string_function
Synopsis
Set a data type's string representation callback
Usage
int SLclass_set_string_function (cl, sfun)
SLang_Class_Type *cl
char *(*sfun) (SLtype, VOID_STAR);
Description
The SLclass_set_string_function routine is used to define a
callback function, sfun, that will be used when a string
representation of an object of the data type represented by cl
is needed. cl must have already been obtained via a call to
SLclass_allocate_class. When called, sfun will be passed two
arguments: an SLtype which represents the data type, and the
address of the object for which a string represetation is
required. The callback function must return a malloced string.
Upon success, SLclass_set_string_function returns zero, or upon
error it returns -1.
Example
A callback function that handles both SLANG_STRING_TYPE and
SLANG_INT_TYPE variables looks like:
char *string_and_int_callback (SLtype type, VOID_STAR addr)
{
char buf[64];
switch (type)
{
case SLANG_STRING_TYPE:
return SLmake_string (*(char **)addr);
case SLANG_INTEGER_TYPE:
sprintf (buf, "%d", *(int *)addr);
return SLmake_string (buf);
}
return NULL;
}
Notes
The default string callback simply returns the name of the data
type.
See Also
SLclass_allocate_class, SLclass_register_class
5.7. SLclass_set_destroy_function
Synopsis
Set the destroy method callback for a data type
Usage
int SLclass_set_destroy_function (cl, destroy_fun)
SLang_Class_Type *cl
void (*destroy_fun) (SLtype, VOID_STAR);
Description
SLclass_set_destroy_function is used to set the destroy callback
for a data type. The data type's class cl must have been
previously obtained via a call to SLclass_allocate_class. When
called, destroy_fun will be passed two arguments: an SLtype
which represents the data type, and the address of the object to
be destroyed.
SLclass_set_destroy_function returns zero upon success, and -1
upon failure.
Example
The destroy method for SLANG_STRING_TYPE looks like:
static void string_destroy (SLtype type, VOID_STAR ptr)
{
char *s = *(char **) ptr;
if (s != NULL) SLang_free_slstring (*(char **) s);
}
Notes
Data types of class SLANG_CLASS_TYPE_SCALAR do not require a
destroy callback. However, other classes do.
See Also
SLclass_allocate_class, SLclass_register_class
5.8. SLclass_set_push_function
Synopsis
Set the push callback for a new data type
Usage
int SLclass_set_push_function (cl, push_fun)
SLang_Class_Type *cl
int (*push_fun) (SLtype, VOID_STAR);
Description
SLclass_set_push_function is used to set the push callback for a
new data type specified by cl, which must have been previously
obtained via SLclass_allocate_class.
The parameter push_fun is a pointer to the push callback. It is
required to take two arguments: an SLtype representing the data
type, and the address of the object to be pushed. It must return
zero upon success, or -1 upon failure.
SLclass_set_push_function returns zero upon success, or -1 upon
failure.
Example
The push callback for SLANG_COMPLEX_TYPE looks like:
static int complex_push (SLtype type, VOID_STAR ptr)
{
double *z = *(double **) ptr;
return SLang_push_complex (z[0], z[1]);
}
See Also
SLclass_allocate_class, SLclass_register_class
5.9. SLclass_set_pop_function
Synopsis
Set the pop callback for a new data type
Usage
int SLclass_set_pop_function (cl, pop_fun)
SLang_Class_Type *cl
int (*pop_fun) (SLtype, VOID_STAR);
Description
SLclass_set_pop_function is used to set the callback for popping
an object from the stack for a new data type specified by cl,
which must have been previously obtained via
SLclass_allocate_class.
The parameter pop_fun is a pointer to the pop callback function,
which is required to take two arguments: an unsigned character
representing the data type, and the address of the object to be
popped. It must return zero upon success, or -1 upon failure.
SLclass_set_pop_function returns zero upon success, or -1 upon
failure.
Example
The pop callback for SLANG_COMPLEX_TYPE looks like:
static int complex_push (SLtype type, VOID_STAR ptr)
{
double *z = *(double **) ptr;
return SLang_pop_complex (&z[0], &z[1]);
}
See Also
SLclass_allocate_class, SLclass_register_class
5.10. SLclass_get_datatype_name
Synopsis
Get the name of a data type
Usage
char *SLclass_get_datatype_name (SLtype type)
Description
The SLclass_get_datatype_name function returns the name of the
data type specified by type. For example, if type is
SLANG_INT_TYPE, the string "Integer_Type" will be returned.
This function returns a pointer that should not be modified or
freed.
See Also
SLclass_allocate_class, SLclass_register_class
5.11. SLang_free_mmt
Synopsis
Free a memory managed type
Usage
void SLang_free_mmt (SLang_MMT_Type *mmt)
Description
The SLang_MMT_Type function is used to free a memory managed
data type.
See Also
SLang_object_from_mmt, SLang_create_mmt
5.12. SLang_object_from_mmt
Synopsis
Get a pointer to the value of a memory managed type
Usage
VOID_STAR SLang_object_from_mmt (SLang_MMT_Type *mmt)
Description
The SLang_object_from_mmt function returns a pointer to the
actual object whose memory is being managed by the interpreter.
See Also
SLang_free_mmt, SLang_create_mmt
5.13. SLang_create_mmt
Synopsis
Create a memory managed data type
Usage
SLang_MMT_Type *SLang_create_mmt (SLtype t, VOID_STAR ptr)
Description
The SLang_create_mmt function returns a pointer to a new memory
managed object. This object contains information necessary to
manage the memory associated with the pointer ptr which
represents the application defined data type of type t.
See Also
SLang_object_from_mmt, SLang_push_mmt, SLang_free_mmt
5.14. SLang_push_mmt
Synopsis
Push a memory managed type
Usage
int SLang_push_mmt (SLang_MMT_Type *mmt)
Description
This function is used to push a memory managed type onto the
interpreter stack. It returns zero upon success, or -1 upon
failure.
See Also
SLang_create_mmt, SLang_pop_mmt
5.15. SLang_pop_mmt
Synopsis
Pop a memory managed data type
Usage
SLang_MMT_Type *SLang_pop_mmt (SLtype t)
Description
The SLang_pop_mmt function may be used to pop a memory managed
type of type t from the stack. It returns a pointer to the
memory managed object upon success, or NULL upon failure. The
function SLang_object_from_mmt should be used to access the
actual pointer to the data type.
See Also
SLang_object_from_mmt, SLang_push_mmt
5.16. SLang_inc_mmt
Synopsis
Increment a memory managed type reference count
Usage
void SLang_inc_mmt (SLang_MMT_Type *mmt);
Description
The SLang_inc_mmt function may be used to increment the
reference count associated with the memory managed data type
given by mmt.
See Also
SLang_free_mmt, SLang_create_mmt, SLang_pop_mmt, SLang_pop_mmt
5.17. SLadd_intrin_fun_table
Synopsis
Add a table of intrinsic functions to the interpreter
Usage
int SLadd_intrin_fun_table(SLang_Intrin_Fun_Type *tbl, char
*pp_name);
Description
The SLadd_intrin_fun_table function adds an array, or table, of
SLang_Intrin_Fun_Type objects to the interpreter. The first
parameter, tbl specifies the table to be added. The second
parameter pp_name, if non-NULL will be added to the list of
preprocessor symbols.
This function returns -1 upon failure or zero upon success.
Notes
A table should only be loaded one time and it is considered to
be an error on the part of the application if it loads a table
more than once.
See Also
SLadd_intrin_var_table, SLadd_intrinsic_function,
SLdefine_for_ifdef
5.18. SLadd_intrin_var_table
Synopsis
Add a table of intrinsic variables to the interpreter
Usage
int SLadd_intrin_var_table (SLang_Intrin_Var_Type *tbl, char
*pp_name);
Description
The SLadd_intrin_var_table function adds an array, or table, of
SLang_Intrin_Var_Type objects to the interpreter. The first
parameter, tbl specifies the table to be added. The second
parameter pp_name, if non-NULL will be added to the list of
preprocessor symbols.
This function returns -1 upon failure or zero upon success.
Notes
A table should only be loaded one time and it is considered to
be an error on the part of the application if it loads a table
more than once.
See Also
SLadd_intrin_var_table, SLadd_intrinsic_function,
SLdefine_for_ifdef
5.19. SLang_load_file
Synopsis
Load a file into the interpreter
Usage
int SLang_load_file (char *fn)
Description
The SLang_load_file function opens the file whose name is
specified by fn and feeds it to the interpreter, line by line,
for execution. If fn is NULL, the function will take input from
stdin.
If no error occurs, it returns 0; otherwise, it returns -1, and
sets SLang_Error accordingly. For example, if it fails to open
the file, it will return -1 with SLang_Error set to
SL_OBJ_NOPEN.
Notes
If the hook SLang_Load_File_Hook declared as
int (*SLang_Load_File_Hook)(char *);
is non-NULL, the function point to by it will be used to load the
file. For example, the jed editor uses this hook to load files via
its own routines.
See Also
SLang_load_object, SLang_load_string
5.20. SLang_restart
Synopsis
Reset the interpreter after an error
Usage
void SLang_restart (int full)
Description
The SLang_restart function should be called by the application
at top level if an error occurs. If the parameter full is non-
zero, any objects on the S-Lang run time stack will be removed
from the stack; otherwise, the stack will be left intact. Any
time the stack is believed to be trashed, this routine should be
called with a non-zero argument (e.g., if setjmp/longjmp is
called).
Calling SLang_restart does not reset the global variable
SLang_Error to zero. It is up to the application to reset that
variable to zero after calling SLang_restart.
Example
while (1)
{
if (SLang_Error)
{
SLang_restart (1);
SLang_Error = 0;
}
(void) SLang_load_file (NULL);
}
See Also
SLang_init_slang, SLang_load_file
5.21. SLang_byte_compile_file
Synopsis
Byte-compile a file for faster loading
Usage
int SLang_byte_compile_file(char *fn, int reserved)
Description
The SLang_byte_compile_file function ``byte-compiles'' the file
fn for faster loading by the interpreter. This produces a new
file whose filename is equivalent to the one specified by fn,
except that a 'c' is appended to the name. For example, if fn is
set to init.sl, then the new file will have the name init.slc.
The meaning of the second parameter, reserved, is reserved for
future use. For now, set it to 0.
The function returns zero upon success, or -1 upon error and
sets SLang_Error accordingly.
See Also
SLang_load_file, SLang_init_slang
5.22. SLang_autoload
Synopsis
Autoload a function from a file
Usage
int SLang_autoload(char *funct, char *filename)
Description
The SLang_autoload function may be used to associate a slang
function name funct with the file filename such that if funct
has not already been defined when needed, it will be loaded from
filename.
SLang_autoload has no effect if funct has already been defined.
Otherwise it declares funct as a user-defined S-Lang function.
It returns 0 upon success, or -1 upon error.
See Also
SLang_load_file, SLang_is_defined
5.23. SLang_load_string
Synopsis
Interpret a string
Usage
int SLang_load_string(char *str)
Description
The SLang_load_string function feeds the string specified by str
to the interpreter for execution. It returns zero upon success,
or -1 upon failure.
See Also
SLang_load_file, SLang_load_object
5.24. SLdo_pop
Synopsis
Delete an object from the stack
Usage
int SLdo_pop(void)
Description
This function removes an object from the top of the interpeter's
run-time stack and frees any memory associated with it. It
returns zero upon success, or -1 upon error (most likely due to
a stack-underflow).
See Also
SLdo_pop_n, SLang_pop_integer, SLang_pop_string
5.25. SLdo_pop_n
Synopsis
Delete n objects from the stack
Usage
int SLdo_pop_n (unsigned int n)
Description
The SLdo_pop_n function removes the top n objects from the
interpreter's run-time stack and frees all memory associated
with the objects. It returns zero upon success, or -1 upon error
(most likely due to a stack-underflow).
See Also
SLdo_pop, SLang_pop_integer, SLang_pop_string
5.26. SLang_pop_integer
Synopsis
Pop an integer off the stack
Usage
int SLang_pop_integer (int *i)
Description
The SLang_pop_integer function removes an integer from the top
of the interpreter's run-time stack and returns its value via
the pointer i. If successful, it returns zero. However, if the
top stack item is not of type SLANG_INT_TYPE, or the stack is
empty, the function will return -1 and set SLang_Error
accordingly.
See Also
SLang_push_integer, SLang_pop_double
5.27. SLpop_string
Synopsis
Pop a string from the stack
Usage
int SLpop_string (char **strptr);
Description
The SLpop_string function pops a string from the stack and
returns it as a malloced pointer. It is up to the calling
routine to free this string via a call to free or SLfree. If
successful, SLpop_string returns zero. However, if the top stack
item is not of type SLANG_STRING_TYPE, or the stack is empty,
the function will return -1 and set SLang_Error accordingly.
Example
define print_string (void)
{
char *s;
if (-1 == SLpop_string (&s))
return;
fputs (s, stdout);
SLfree (s);
}
Notes
This function should not be confused with SLang_pop_slstring,
which pops a hashed string from the stack.
See Also
SLang_pop_slstring. SLfree
5.28. SLang_pop_string
Synopsis
Pop a string from the stack
Usage
int SLang_pop_string(char **strptr, int *do_free)
Description
The SLpop_string function pops a string from the stack and
returns it as a malloced pointer via strptr. After the function
returns, the integer pointed to by the second parameter will be
set to a non-zero value if *strptr should be freed via free or
SLfree. If successful, SLpop_string returns zero. However, if
the top stack item is not of type SLANG_STRING_TYPE, or the
stack is empty, the function will return -1 and set SLang_Error
accordingly.
Notes
This function is considered obsolete and should not be used by
applications. If one requires a malloced string for
modification, SLpop_string should be used. If one requires a
constant string that will not be modifed by the application,
SLang_pop_slstring should be used.
See Also
SLang_pop_slstring, SLpop_string
5.29. SLang_pop_slstring
Synopsis
Pop a hashed string from the stack
Usage
int SLang_pop_slstring (char **s_ptr)
Description
The SLang_pop_slstring function pops a hashed string from the S-
Lang run-time stack and returns it via s_ptr. It returns zero if
successful, or -1 upon failure. The resulting string should be
freed via a call to SLang_free_slstring after use.
Example
void print_string (void)
{
char *s;
if (-1 == SLang_pop_slstring (&s))
return;
fprintf (stdout, "%s\n", s);
SLang_free_slstring (s);
}
Notes
SLang_free_slstring is the preferred function for popping
strings. This is a result of the fact that the interpreter uses
hashed strings as the native representation for string data.
One must never free a hashed string using free or SLfree. In
addition, one must never make any attempt to modify a hashed
string and doing so will result in memory corruption.
See Also
SLang_free_slstring, SLpop_string
5.30. SLang_pop_double
Synopsis
Pop a double from the stack
Usage
int SLang_pop_double (double *dptr)
Description
The SLang_pop_double function pops a double precision number
from the stack and returns it via dptr. This function returns 0
upon success, otherwise it returns -1 and sets SLang_Error
accordingly.
See Also
SLang_pop_integer, SLang_push_double
5.31. SLang_pop_complex
Synopsis
Pop a complex number from the stack
Usage
int SLang_pop_complex (double *re, double *im)
Description
SLang_pop_complex pops a complex number from the stack and
returns it via the parameters re and im as the real and
imaginary parts of the complex number, respectively. This
function automatically converts objects of type
SLANG_DOUBLE_TYPE and SLANG_INT_TYPE to SLANG_COMPLEX_TYPE, if
necessary. It returns zero upon success, or -1 upon error
setting SLang_Error accordingly.
See Also
SLang_pop_integer, SLang_pop_double, SLang_push_complex
5.32. SLang_push_complex
Synopsis
Push a complex number onto the stack
Usage
int SLang_push_complex (double re, double im)
Description
SLang_push_complex may be used to push the complex number whose
real and imaginary parts are given by re and im, respectively.
It returns zero upon success, or -1 upon error setting
SLang_Error accordingly.
See Also
SLang_pop_complex, SLang_push_double
5.33. SLang_push_double
Synopsis
Push a double onto the stack
Usage
int SLang_push_double(double d)
Description
SLang_push_double may be used to push the double precision
floating point number d onto the interpreter's run-time stack.
It returns zero upon success, or -1 upon error setting
SLang_Error accordingly.
See Also
SLang_pop_double, SLang_push_integer
5.34. SLang_push_string
Synopsis
Push a string onto the stack
Usage
int SLang_push_string (char *s)
Description
SLang_push_string pushes a copy of the string specified by s
onto the interpreter's run-time stack. It returns zero upon
success, or -1 upon error setting SLang_Error accordingly.
Notes
If s is NULL, this function pushes NULL (SLANG_NULL_TYPE) onto
the stack.
See Also
SLang_push_malloced_string
5.35. SLang_push_integer
Synopsis
Push an integer onto the stack
Usage
int SLang_push_integer (int i)
Description
SLang_push_integer the integer i onto the interpreter's run-time
stack. It returns zero upon success, or -1 upon error setting
SLang_Error accordingly.
See Also
SLang_pop_integer, SLang_push_double, SLang_push_string
5.36. SLang_push_malloced_string
Synopsis
Push a malloced string onto the stack
Usage
int SLang_push_malloced_string (char *s);
Description
SLang_push_malloced_string may be used to push a malloced string
onto the interpreter's run-time stack. It returns zero upon
success, or -1 upon error setting SLang_Error accordingly.
Example
The following example illustrates that it is up to the calling
routine to free the string if SLang_push_malloced_string fails:
int push_hello (void)
{
char *s = malloc (6);
if (s == NULL) return -1;
strcpy (s, "hello");
if (-1 == SLang_push_malloced_string (s))
{
free (s);
return -1;
}
return 0;
}
Example
The function SLang_create_slstring returns a hashed string.
Such a string may not be malloced and should not be passed to
SLang_push_malloced_string.
Notes
If s is NULL, this function pushes NULL (SLANG_NULL_TYPE) onto
the stack.
See Also
SLang_push_string, SLmake_string
5.37. SLang_is_defined
Synopsis
Check to see if the interpreter defines an object
Usage
int SLang_is_defined (char *nm)
Description
The SLang_is_defined function may be used to determine whether
or not a variable or function whose name is given by em has been
defined. It returns zero if no such object has been defined.
Otherwise it returns a non-zero value according to the following
table:
1 intrinsic function
2 user-defined slang function
-1 intrinsic variable
-2 user-defined global variable
Note that variables correspond to negative numbers and functions
are represented by positive numbers.
See Also
SLadd_intrinsic_function, SLang_run_hooks,
SLang_execute_function
5.38. SLang_run_hooks
Synopsis
Run a user-defined hook with arguments
Usage
int SLang_run_hooks (char *fname, unsigned int n, ...)
Description
The SLang_run_hooks function may be used to execute a user-
defined function named fname. Before execution of the function,
the n string arguments specified by the variable parameter list
are pushed onto the stack. If the function fname does not exist,
SLang_run_hooks returns zero; otherwise, it returns 1 upon
successful execution of the function, or -1 if an error
occurred.
Example
The jed editor uses SLang_run_hooks to setup the mode of a
buffer based on the filename extension of the file associated
with the buffer:
char *ext = get_filename_extension (filename);
if (ext == NULL) return -1;
if (-1 == SLang_run_hooks ("mode_hook", 1, ext))
return -1;
return 0;
See Also
SLang_is_defined, SLang_execute_function
5.39. SLang_execute_function
Synopsis
Execute a user or intrinsic function
Usage
int SLang_execute_function (char *fname)
Description
This function may be used to execute either a user-defined
function or an intrinisic function. The name of the function is
specified by fname. It returns zero if fname is not defined, or
1 if the function was successfully executed, or -1 upon error.
Notes
The function SLexecute_function may be a better alternative for
some uses.
See Also
SLang_run_hooks, SLexecute_function, SLang_is_defined
5.40. SLang_get_function
Synopsis
Get a pointer to a S-Lang function
Usage
SLang_Name_Type *SLang_get_function (char *fname)
Description
This function returns a pointer to the internal S-Lang table
entry of a function whose name is given by fname. It returns
NULL upon failure. The value returned by this function can be
used SLexecute_function to call the function directly from C.
See Also
SLexecute_function
5.41. SLexecute_function
Synopsis
Execute a S-Lang or intrinsic function
Usage
int SLexecute_function (SLang_Name_Type *nt)
Description
The SLexecute_function allows an application to call the S-Lang
function specified by the SLang_Name_Type pointer nt. This
parameter must be non NULL and must have been previously
obtained by a call to SLang_get_function.
Example
Consider the S-Lang function:
define my_fun (x)
{
return x^2 - 2;
}
Suppose that it is desired to call this function many times with
different values of x. There are at least two ways to do this. The
easiest way is to use SLang_execute_function by passing the string
"my_fun". A better way that is much faster is to use SLexe-
cute_function:
int sum_a_function (char *fname, double *result)
{
double sum, x, y;
SLang_Name_Type *nt;
if (NULL == (nt = SLang_get_function (fname)))
return -1;
sum = 0;
for (x = 0; x < 10.0; x += 0.1)
{
SLang_start_arg_list ();
if (-1 == SLang_push_double (x))
return -1;
SLang_end_arg_list ();
if (-1 == SLexecute_function (nt))
return -1;
if (-1 == SLang_pop_double (&y))
return -1;
sum += y;
}
return sum;
}
Although not necessary in this case, SLang_start_arg_list and
SLang_end_arg_list were used to provide the function with informa-
tion about the number of parameters passed to it.
See Also
SLang_get_function, SLang_start_arg_list, SLang_end_arg_list
5.42. SLang_peek_at_stack
Synopsis
Find the type of object on the top of the stack
Usage
int SLang_peek_at_stack (void)
Description
The SLang_peek_at_stack function is useful for determining the
data type of the object at the top of the stack. It returns the
data type, or -1 upon a stack-underflow error. It does not
remove anything from the stack.
See Also
SLang_pop_string, SLang_pop_integer
5.43. SLang_pop_fileptr
Synopsis
Pop a file pointer
Usage
int SLang_pop_fileptr (SLang_MMT_Type **mmt, FILE **fp)
Description
SLang_pop_fileptr pops a file pointer from the S-Lang run-time
stack. It returns zero upon success, or -1 upon failure.
A S-Lang file pointer (SLANG_FILEPTR_TYPE) is actually a memory
managed object. For this reason, SLang_pop_fileptr also returns
the memory managed object via the argument list. It is up to the
calling routine to call SLang_free_mmt to free the object.
Example
The following example illustrates an application defined
intrinsic function that writes a user defined double precision
number to a file. Note the use of SLang_free_mmt:
int write_double (void)
{
double t;
SLang_MMT_Type *mmt;
FILE *fp;
int status;
if (-1 == SLang_pop_double (&d, NULL, NULL))
return -1;
if (-1 == SLang_pop_fileptr (&mmt, &fp))
return -1;
status = fwrite (&d, sizeof (double), 1, fp);
SLang_free_mmt (mmt);
return status;
}
This function can be used by a S-Lang function as follows:
define write_some_values ()
{
variable fp, d;
fp = fopen ("myfile.dat", "wb");
if (fp == NULL)
error ("file failed to open");
for (d = 0; d < 10.0; d += 0.1)
{
if (-1 == write_double (fp, d))
error ("write failed");
}
if (-1 == fclose (fp))
error ("fclose failed");
}
See Also
SLang_free_mmt, SLang_pop_double
5.44. SLadd_intrinsic_function
Synopsis
Add a new intrinsic function to the interpreter
Usage
int SLadd_intrinsic_function (name, f, type, nargs, ...)
char *name
FVOID_STAR f
SLtype type
unsigned int nargs
Description
The SLadd_intrinsic_function function may be used to add a new
intrinsic function. The S-Lang name of the function is specified
by name and the actual function pointer is given by f, cast to
FVOID_STAR. The third parameter, type specifies the return type
of the function and must be one of the following values:
SLANG_VOID_TYPE (returns nothing)
SLANG_INT_TYPE (returns int)
SLANG_DOUBLE_TYPE (returns double)
SLANG_STRING_TYPE (returns char *)
The nargs parameter specifies the number of parameters to pass to
the function. The variable argument list following nargs must con-
sists of nargs integers which specify the data type of each argu-
ment.
The function returns zero upon success or -1 upon failure.
Example
The jed editor uses this function to change the system intrinsic
function to the following:
static int jed_system (char *cmd)
{
if (Jed_Secure_Mode)
{
msg_error ("Access denied.");
return -1;
}
return SLsystem (cmd);
}
After initializing the interpreter with SLang_init_slang, jed calls
SLadd_intrinsic_function to substitute the above definition for the
default S-Lang definition:
if (-1 == SLadd_intrinsic_function ("system", (FVOID_STAR)jed_system,
SLANG_INT_TYPE, 1,
SLANG_STRING_TYPE))
return -1;
See Also
SLadd_intrinsic_variable, SLadd_intrinsic_array
5.45. SLadd_intrinsic_variable
Synopsis
Add an intrinsic variable to the interpreter
Usage
int SLadd_intrinsic_variable (name, addr, type, rdonly)
char *name
VOID_STAR addr
SLtype type
int rdonly
Description
The SLadd_intrinsic_variable function adds an intrinsic variable
called name to the interpeter. The second parameter addr
specifies the address of the variable (cast to VOID_STAR). The
third parameter, type, specifies the data type of the variable.
If the fourth parameter, rdonly, is non-zero, the variable will
interpreted by the interpreter as read-only.
If successful, SLadd_intrinsic_variable returns zero, otherwise
it returns -1.
Example
Suppose that My_Global_Int is a global variable (at least not a
local one):
int My_Global_Int;
It can be added to the interpreter via the function call
if (-1 == SLadd_intrinsic_variable ("MyGlobalInt",
(VOID_STAR)&My_Global_Int,
SLANG_INT_TYPE, 0))
exit (1);
Notes
The current implementation requires all pointer type intrinsic
variables to be read-only. For example,
char *My_Global_String;
is of type SLANG_STRING_TYPE, and must be declared as read-only.
Finally, not that
char My_Global_Char_Buf[256];
is not a SLANG_STRING_TYPE object. This difference is very impor-
tant because internally the interpreter dereferences the address
passed to it to get to the value of the variable.
See Also
SLadd_intrinsic_function, SLadd_intrinsic_array
5.46. SLclass_add_unary_op
Synopsis
??
Usage
int SLclass_add_unary_op (SLtype,int (*) (int, SLtype,
VOID_STAR, unsigned int, VOID_STAR), int (*) (int, SLtype,
SLtype *));
Description
??
See Also
??
5.47. SLclass_add_app_unary_op
Synopsis
??
Usage
int SLclass_add_app_unary_op (SLtype, int (*) (int,SLtype,
VOID_STAR, unsigned int,VOID_STAR),int (*) (int, SLtype, SLtype
*));
Description
??
See Also
??
5.48. SLclass_add_binary_op
Synopsis
??
Usage
int SLclass_add_binary_op (SLtype, SLtype,int (*)(int, SLtype,
VOID_STAR, unsigned int,SLtype, VOID_STAR, unsigned
int,VOID_STAR),int (*) (int, SLtype, SLtype, SLtype *));
Description
??
See Also
??
5.49. SLclass_add_math_op
Synopsis
??
Usage
int SLclass_add_math_op (SLtype,int (*)(int,SLtype, VOID_STAR,
unsigned int,VOID_STAR),int (*)(int, SLtype, SLtype *));
Description
??
See Also
??
5.50. SLclass_add_typecast
Synopsis
??
Usage
int SLclass_add_typecast (SLtype, SLtype int (*)_PROTO((SLtype,
VOID_STAR, unsigned int,SLtype, VOID_STAR)),int);
Description
??
See Also
??
6. Library Initialization Functions
6.1. SLang_init_slang
Synopsis
Initialize the interpreter
Usage
int SLang_init_slang (void)
Description
The SLang_init_slang function must be called by all applications
that use the S-Lang interpreter. It initializes the interpreter,
defines the built-in data types, and adds a set of core
intrinsic functions.
The function returns 0 upon success, or -1 upon failure.
See Also
SLang_init_slfile, SLang_init_slmath, SLang_init_slunix
6.2. SLang_init_slfile
Synopsis
Initialize the interpreter file I/O intrinsics
Usage
int SLang_init_slfile (void)
Description
This function initializes the interpreters file I/O intrinsic
functions. This function adds intrinsic functions such as fopen,
fclose, and fputs to the interpreter. It returns 0 if
successful, or -1 upon error.
Notes
Before this function can be called, it is first necessary to
call SLang_init_slang. It also adds the preprocessor symbol
__SLFILE__ to the interpreter.
See Also
SLang_init_slang, SLang_init_slunix, SLang_init_slmath
6.3. SLang_init_slmath
Synopsis
Initialize the interpreter math intrinsics
Usage
int SLang_init_slmath (void)
Description
The SLang_init_slmath function initializes the interpreter's
mathematical intrinsic functions and makes them available to the
language. The intrinsic functions include sin, cos, tan, etc...
It returns 0 if successful, or -1 upon failure.
Notes
This function must be called after SLang_init_slang. It adds the
preprocessor symbol __SLMATH__ to the interpreter.
See Also
SLang_init_slang, SLang_init_slfile, SLang_init_slunix
6.4. SLang_init_slunix
Synopsis
Make available some unix system calls to the interpreter
Usage
int SLang_init_slunix (void)
Description
The SLang_init_slunix function initializes the interpreter's
unix system call intrinsic functions and makes them available to
the language. Examples of functions made available by
SLang_init_slunix include chmod, chown, and stat_file. It
returns 0 if successful, or -1 upon failure.
Notes
This function must be called after SLang_init_slang. It adds the
preprocessor symbol __SLUNIX__ to the interpreter.
See Also
SLang_init_slang, SLang_init_slfile, SLang_init_slmath
7. Miscellaneous Functions
7.1. SLcurrent_time_string
Synopsis
Get the current time as a string
Usage
char *SLcurrent_time_string (void)
Description
The SLcurrent_time_string function uses the C library function
ctime to obtain a string representation of the current date and
time in the form
"Wed Dec 10 12:50:28 1997"
However, unlike the ctime function, a newline character is not
present in the string.
The returned value points to a statically allocated memory block
which may get overwritten on subsequent function calls.
See Also
SLmake_string
7.2. SLatoi
Synopsis
Convert a text string to an integer
Usage
int SLatoi(unsigned char *str
Description
SLatoi parses the string str to interpret it as an integer
value. Unlike atoi, SLatoi can also parse strings containing
integers expressed in hexidecimal (e.g., "0x7F") and octal
(e.g., "012".) notation.
See Also
SLang_guess_type
7.3. SLextract_list_element
Synopsis
Extract a substring of a delimited string
Usage
int SLextract_list_element (dlist, nth, delim, buf, buflen)
char *dlist;
unsigned int nth;
char delim;
char *buf;
unsigned int buflen;
Description
SLextract_list_element may be used to obtain the nth element of
a list of strings, dlist, that are delimited by the character
delim. The routine copies the nth element of dlist to the buffer
buf whose size is buflen characters. It returns zero upon
success, or -1 if dlist does not contain an nth element.
Example
A delimited list of strings may be turned into an array of
strings as follows. For conciseness, all malloc error checking
has been omitted.
int list_to_array (char *list, char delim, char ***ap)
{
unsigned int nth;
char **a;
char buf[1024];
/* Determine the size of the array */
nth = 0;
while (0 == SLextract_list_element (list, nth, delim, buf, sizeof(buf)))
nth++;
ap = (char **) SLmalloc ((nth + 1) * sizeof (char **));
nth = 0;
while (0 == SLextract_list_element (list, nth, delim, buf, sizeof(buf)))
{
a[nth] = SLmake_string (buf);
nth++;
}
a[nth] = NULL;
*ap = a;
return 0;
}
See Also
SLmalloc, SLmake_string
8. Error and Messaging Functions
8.1. SLang_verror
Synopsis
Signal an error with a message
Usage
void SLang_verror (int code, char *fmt, ...);
Description
The SLang_verror function sets SLang_Error to code if
SLang_Error is 0. It also displays the error message implied by
the printf variable argument list using fmt as the format.
Example
FILE *open_file (char *file)
{
char *file = "my_file.dat";
if (NULL == (fp = fopen (file, "w")))
SLang_verror (SL_INTRINSIC_ERROR, "Unable to open %s", file);
return fp;
}
See Also
SLang_vmessage, SLang_exit_error
8.2. SLang_doerror
Synopsis
Signal an error
Usage
void SLang_doerror (char *err_str)
Description
The SLang_doerror function displays the string err_str to the
error device and signals a S-Lang error.
Notes
SLang_doerror is considered to obsolete. Applications should use
the SLang_verror function instead.
See Also
SLang_verror, SLang_exit_error
8.3. SLang_vmessage
Synopsis
Display a message to the message device
Usage
void SLang_vmessage (char *fmt, ...)
Description
This function prints a printf style formatted variable argument
list to the message device. The default message device is
stdout.
See Also
SLang_verror
8.4. SLang_exit_error
Synopsis
Exit the program and display an error message
Usage
void SLang_exit_error (char *fmt, ...)
Description
The SLang_exit_error function terminates the program and
displays an error message using a printf type variable argument
list. The default behavior to this function is to write the
message to stderr and exit with the exit system call.
If the function pointer SLang_Exit_Error_Hook is non-NULL, the
function to which it points will be called. This permits an
application to perform whatever cleanup is necessary. This hook
has the prototype:
void (*SLang_Exit_Error_Hook)(char *, va_list);
See Also
SLang_verror, exit
9. String and Memory Allocation Functions
9.1. SLmake_string
Synopsis
Duplicate a string
Usage
char *SLmake_string (char *s)
Description
The SLmake_string function creates a new copy of the string s,
via malloc, and returns it. Upon failure it returns NULL. Since
the resulting string is malloced, it should be freed when
nolonger needed via a call to either free or SLfree.
Notes
SLmake_string should not be confused with the function
SLang_create_slstring, which performs a similar function.
See Also
SLmake_nstring, SLfree, SLmalloc, SLang_create_slstring
9.2. SLmake_nstring
Synopsis
Duplicate a substring
Usage
char *SLmake_nstring (char *s, unsigned int n)
Description
This function is like SLmake_string except that it creates a
null terminated string formed from the first n characters of s.
Upon failure, it returns NULL, otherwise it returns the new
string. When nolonger needed, the returned string should be
freed with SLfree.
See Also
SLmake_string, SLfree, SLang_create_nslstring
9.3. SLang_create_nslstring
Synopsis
Created a hashed substring
Usage
char *SLang_create_nslstring (char *s, unsigned int n)
Description
SLang_create_nslstring is like SLang_create_slstring except that
only the first n characters of s are used to create the hashed
string. Upon error, it returns NULL, otherwise it returns the
hashed substring. Such a string must be freed by the function
SLang_free_slstring.
Notes
Do not use free or SLfree to free the string returned by
SLang_create_slstring or SLang_create_nslstring. Also it is
important that no attempt is made to modify the hashed string
returned by either of these functions. If one needs to modify a
string, the functions SLmake_string or SLmake_nstring should be
used instead.
See Also
SLang_free_slstring, SLang_create_slstring, SLmake_nstring
9.4. SLang_create_slstring
Synopsis
Create a hashed string
Usage
char *SLang_create_slstring (char *s)
Description
The SLang_create_slstring creates a copy of s and returns it as
a hashed string. Upon error, the function returns NULL,
otherwise it returns the hashed string. Such a string must only
be freed via the SLang_free_slstring function.
Notes
Do not use free or SLfree to free the string returned by
SLang_create_slstring or SLang_create_nslstring. Also it is
important that no attempt is made to modify the hashed string
returned by either of these functions. If one needs to modify a
string, the functions SLmake_string or SLmake_nstring should be
used instead.
See Also
SLang_free_slstring, SLang_create_nslstring, SLmake_string
9.5. SLang_free_slstring
Synopsis
Free a hashed string
Usage
void SLang_free_slstring (char *s)
Description
The SLang_free_slstring function is used to free a hashed string
such as one returned by SLang_create_slstring,
SLang_create_nslstring, or SLang_create_static_slstring. If s
is NULL, the routine does nothing.
See Also
SLang_create_slstring, SLang_create_nslstring,
SLang_create_static_slstring
9.6. SLang_concat_slstrings
Synopsis
Concatenate two strings to produce a hashed string
Usage
char *SLang_concat_slstrings (char *a, char *b)
Description
The SLang_concat_slstrings function concatenates two strings, a
and b, and returns the result as a hashed string. Upon failure,
NULL is returned.
Notes
A hashed string can only be freed using SLang_free_slstring.
Never use free or SLfree to free a hashed string, otherwise
memory corruption will result.
See Also
SLang_free_slstring, SLang_create_slstring
9.7. SLang_create_static_slstring
Synopsis
Create a hashed string
Usage
char *SLang_create_static_slstring (char *s_literal)
Description
The SLang_create_static_slstring creates a hashed string from
the string literal s_literal and returns the result. Upon
failure it returns NULL.
Example
char *create_hello (void)
{
return SLang_create_static_slstring ("hello");
}
Notes
This function should only be used with string literals.
See Also
SLang_create_slstring, SLang_create_nslstring
9.8. SLmalloc
Synopsis
Allocate some memory
Usage
char *SLmalloc (unsigned int nbytes)
Description
This function uses malloc to allocate nbytes of memory. Upon
error it returns NULL; otherwise it returns a pointer to the
allocated memory. One should use SLfree to free the memory after
use.
See Also
SLfree, SLrealloc, SLcalloc
9.9. SLcalloc
Synopsis
Allocate some memory
Usage
char *SLcalloc (unsigned int num_elem, unsigned int elem_size)
Description
This function uses calloc to allocate memory for num_elem
objects with each of size elem_size and returns the result. In
addition, the newly allocated memory is zeroed. Upon error it
returns NULL; otherwise it returns a pointer to the allocated
memory. One should use SLfree to free the memory after use.
See Also
SLmalloc, SLrealloc, SLfree
9.10. SLfree
Synopsis
Free some allocated memory
Usage
void SLfree (char *ptr)
Description
The SLfree function deallocates the memory specified by ptr,
which may be NULL in which case the function does nothing.
Notes
Never use this function to free a hashed string returned by one
of the family of slstring functions, e.g., SLang_pop_slstring.
See Also
SLmalloc, SLcalloc, SLrealloc, SLmake_string
9.11. SLrealloc
Synopsis
Resize a dynamic memory block
Usage
char *SLrealloc (char *ptr, unsigned int new_size)
Description
The SLrealloc uses the realloc function to resize the memory
block specified by ptr to the new size new_size. If ptr is
NULL, the function call is equivalent to SLmalloc(new_size).
Similarly, if new_size is zero, the function call is equivalent
to SLfree(ptr).
If the function fails, or if new_size is zero, NULL is returned.
Otherwise a pointer is returned to the (possibly moved) new
block of memory.
See Also
SLfree, SLmalloc, SLcalloc
10. Keyboard Input Functions
10.1. SLang_init_tty
Synopsis
Initialize the terminal keyboard interface
Usage
int SLang_init_tty (int intr_ch, int no_flow_ctrl, int opost)
Description
SLang_init_tty initializes the terminal for single character
input. If the first parameter intr_ch is in the range 0-255, it
will be used as the interrupt character, e.g., under Unix this
character will generate a SIGINT signal. Otherwise, if it is -1,
the interrupt character will be left unchanged.
If the second parameter no_flow_ctrl is non-zero, flow control
(XON/XOFF) processing will be enabled.
If the last parmeter opost is non-zero, output processing by the
terminal will be enabled. If one intends to use this function in
conjunction with the S-Lang screen management routines (SLsmg),
this paramete shold be set to zero.
SLang_init_tty returns zero upon success, or -1 upon error.
Notes
Terminal I/O is a complex subject. The S-Lang interface presents
a simplification that the author has found useful in practice.
For example, the only special character processing that
SLang_init_tty enables is that of the SIGINT character, and the
generation of other signals via the keyboard is disabled.
However, generation of the job control signal SIGTSTP is
possible via the SLtty_set_suspend_state function.
Under Unix, the integer variable SLang_TT_Read_FD is used to
specify the input descriptor for the terminal. If
SLang_TT_Read_FD represents a terminal device as determined via
the isatty system call, then it will be used as the terminal
file descriptor. Otherwise, the terminal device /dev/tty will
used as the input device. The default value of SLang_TT_Read_FD
is -1 which causes /dev/tty to be used. So, if you prefer to use
stdin for input, then set SLang_TT_Read_FD to fileno(stdin)
before calling SLang_init_tty.
If the variable SLang_TT_Baud_Rate is zero when this function is
called, the function will attempt to determine the baud rate by
querying the terminal driver and set SLang_TT_Baud_Rate to that
value.
See Also
SLang_reset_tty, SLang_getkey, SLtty_set_suspend_state
10.2. SLang_reset_tty
Synopsis
Reset the terminal
Usage
void SLang_reset_tty (void)
Description
SLang_reset_tty resets the terminal interface back to the state
it was in before SLang_init_tty was called.
See Also
SLang_init_tty
10.3. SLtty_set_suspend_state
Synopsis
Enable or disable keyboard suspension
Usage
void SLtty_set_suspend_state (int s)
Description
The SLtty_set_suspend_state function may be used to enable or
disable keyboard generation of the SIGTSTP job control signal.
If s is non-zero, generation of this signal via the terminal
interface will be enabled, otherwise it will be disabled.
This function should only be called after the terminal driver
has be initialized via SLang_init_tty. The SLang_init_tty always
disables the generation of SIGTSTP via the keyboard.
See Also
SLang_init_tty
10.4. SLang_getkey
Synopsis
Read a character from the keyboard
Usage
unsigned int SLang_getkey (void);
Description
The SLang_getkey reads a single character from the terminal and
returns it. The terminal must first be initialized via a call to
SLang_init_tty before this function can be called. Upon success,
SLang_getkey returns the character read from the terminal,
otherwise it returns SLANG_GETKEY_ERROR.
See Also
SLang_init_tty, SLang_input_pending, SLang_ungetkey
10.5. SLang_ungetkey_string
Synopsis
Unget a key string
Usage
int SLang_ungetkey_string (unsigned char *buf, unsigned int n)
Description
The SLang_ungetkey_string function may be used to push the n
characters pointed to by buf onto the buffered input stream that
SLgetkey uses. If there is not enough room for the characters,
-1 is returned and none are buffered. Otherwise, it returns
zero.
Notes
The difference between SLang_buffer_keystring and
SLang_ungetkey_string is that the SLang_buffer_keystring appends
the characters to the end of the getkey buffer, whereas
SLang_ungetkey_string inserts the characters at the beginning of
the input buffer.
See Also
SLang_ungetkey, SLang_getkey
10.6. SLang_buffer_keystring
Synopsis
Append a keystring to the input buffer
Usage
int SLang_buffer_keystring (unsigned char *b, unsigned int len)
Description
SLang_buffer_keystring places the len characters specified by b
at the end of the buffer that SLang_getkey uses. Upon success it
returns 0; otherwise, no characters are buffered and it returns
-1.
Notes
The difference between SLang_buffer_keystring and
SLang_ungetkey_string is that the SLang_buffer_keystring appends
the characters to the end of the getkey buffer, whereas
SLang_ungetkey_string inserts the characters at the beginning of
the input buffer.
See Also
SLang_getkey, SLang_ungetkey, SLang_ungetkey_string
10.7. SLang_ungetkey
Synopsis
Push a character back onto the input buffer
Usage
int SLang_ungetkey (unsigned char ch)
Description
SLang_ungetkey pushes the character ch back onto the SLgetkey
input stream. Upon success, it returns zero, otherwise it
returns 1.
Example
This function is implemented as:
int SLang_ungetkey (unsigned char ch)
{
return SLang_ungetkey_string(&ch, 1);
}
See Also
SLang_getkey, SLang_ungetkey_string
10.8. SLang_flush_input
Synopsis
Discard all keyboard input waiting to be read
Usage
void SLang_flush_input (void)
Description
SLang_flush_input discards all input characters waiting to be
read by the SLang_getkey function.
See Also
SLang_getkey
10.9. SLang_input_pending
Synopsis
Check to see if input is pending
Usage
int SLang_input_pending (int tsecs)
Description
SLang_input_pending may be used to see if an input character is
available to be read without causing SLang_getkey to block. It
will wait up to tsecs tenths of a second if no characters are
immediately available for reading. If tsecs is less than zero,
then SLang_input_pending will wait -tsecs milliseconds for
input, otherwise tsecs represents 1/10 of a second intervals.
Notes
Not all systems support millisecond resolution.
See Also
SLang_getkey
10.10. SLang_set_abort_signal
Synopsis
Set the signal to trap SIGINT
Usage
void SLang_set_abort_signal (void (*f)(int));
Description
SLang_set_abort_signal sets the function that gets triggered
when the user presses the interrupt key (SIGINT) to the function
f. If f is NULL the default handler will get installed.
Example
The default interrupt handler on a Unix system is:
static void default_sigint (int sig)
{
SLKeyBoard_Quit = 1;
if (SLang_Ignore_User_Abort == 0) SLang_Error = SL_USER_BREAK;
SLsignal_intr (SIGINT, default_sigint);
}
Notes
For Unix programmers, the name of this function may appear
misleading since it is associated with SIGINT and not SIGABRT.
The origin of the name stems from the original intent of the
function: to allow the user to abort the running of a S-Lang
interpreter function.
See Also
SLang_init_tty, SLsignal_intr
11. Keymap Functions
11.1. SLkm_define_key
Synopsis
Define a key in a keymap
Usage
int SLkm_define_key (char *seq, FVOID_STAR f, SLKeyMap_List_Type
*km)
Description
SLkm_define_key associates the key sequence seq with the
function pointer f in the keymap specified by km. Upon success,
it returns zero, otherwise it returns a negative integer upon
error.
See Also
SLkm_define_keysym, SLang_define_key
11.2. SLang_define_key
Synopsis
Define a key in a keymap
Usage
int SLang_define_key(char *seq, char *fun, SLKeyMap_List_Type
*km)
Description
SLang_define_key associates the key sequence seq with the
function whose name is fun in the keymap specified by km.
See Also
SLkm_define_keysym, SLkm_define_key
11.3. SLkm_define_keysym
Synopsis
Define a keysym in a keymap
Usage
int SLkm_define_keysym (seq, ks, km)
char *seq;
unsigned int ks;
SLKeyMap_List_Type *km;
Description
SLkm_define_keysym associates the key sequence seq with the
keysym ks in the keymap km. Keysyms whose value is less than or
equal to 0x1000 is reserved by the library and should not be
used.
See Also
SLkm_define_key, SLang_define_key
11.4. SLang_undefine_key
Synopsis
Undefined a key from a keymap
Usage
void SLang_undefine_key(char *seq, SLKeyMap_List_Type *km);
Description
SLang_undefine_key removes the key sequence seq from the keymap
km.
See Also
SLang_define_key
11.5. SLang_create_keymap
Synopsis
Create a new keymap
Usage
SLKeyMap_List_Type *SLang_create_keymap (name, km)
char *name;
SLKeyMap_List_Type *km;
Description
SLang_create_keymap creates a new keymap called name by copying
the key definitions from the keymap km. If km is NULL, the newly
created keymap will be empty and it is up to the calling routine
to initialize it via the SLang_define_key and SLkm_define_keysym
functions. SLang_create_keymap returns a pointer to the new
keymap, or NULL upon failure.
See Also
SLang_define_key, SLkm_define_keysym
11.6. SLang_do_key
Synopsis
Read a keysequence and return its keymap entry
Usage
SLang_Key_Type *SLang_do_key (kml, getkey)
SLKeyMap_List_Type *kml;
int (*getkey)(void);
Description
The SLang_do_key function reads characters using the function
specified by the getkey function pointer and uses the key
sequence to return the appropriate entry in the keymap specified
by kml.
SLang_do_key returns NULL if the key sequence is not defined by
the keymap, otherwise it returns a pointer to an object of type
SLang_Key_Type, which is defined in slang.h as
#define SLANG_MAX_KEYMAP_KEY_SEQ 14
typedef struct SLang_Key_Type
{
struct SLang_Key_Type *next;
union
{
char *s;
FVOID_STAR f;
unsigned int keysym;
}
f;
unsigned char type; /* type of function */
#define SLKEY_F_INTERPRET 0x01
#define SLKEY_F_INTRINSIC 0x02
#define SLKEY_F_KEYSYM 0x03
unsigned char str[SLANG_MAX_KEYMAP_KEY_SEQ + 1];/* key sequence */
}
SLang_Key_Type;
The type field specifies which field of the union f should be used.
If type is SLKEY_F_INTERPRET, then f.s is a string that should be
passed to the interpreter for evaluation. If type is SLKEY_F_IN-
TRINSIC, then f.f refers to function that should be called. Other-
wise, type is SLKEY_F_KEYSYM and f.keysym represents the value of
the keysym that is associated with the key sequence.
See Also
SLkm_define_keysym, SLkm_define_key
11.7. SLang_find_key_function
Synopsis
Obtain a function pointer associated with a keymap
Usage
FVOID_STAR SLang_find_key_function (fname, km);
char *fname;
SLKeyMap_List_Type *km;
Description
The SLang_find_key_function routine searches through the
SLKeymap_Function_Type list of functions associated with the
keymap km for the function with name fname. If a matching
function is found, a pointer to the function will be returned,
otherwise SLang_find_key_function will return NULL.
See Also
SLang_create_keymap, SLang_find_keymap
11.8. SLang_find_keymap
Synopsis
Find a keymap
Usage
SLKeyMap_List_Type *SLang_find_keymap (char *keymap_name);
Description
The SLang_find_keymap function searches through the list of
keymaps looking for one whose name is keymap_name. If a matching
keymap is found, the function returns a pointer to the keymap.
It returns NULL if no such keymap exists.
See Also
SLang_create_keymap, SLang_find_key_function
11.9. SLang_process_keystring
Synopsis
Un-escape a key-sequence
Usage
char *SLang_process_keystring (char *kseq);
Description
The SLang_process_keystring function converts an escaped key
sequence to its raw form by converting two-character
combinations such as ^A to the single character Ctrl-A (ASCII
1). In addition, if the key sequence contains constructs such as
^(XX), where XX represents a two-character termcap specifier,
the termcap escape sequence will be looked up and substituted.
Upon success, SLang_process_keystring returns a raw key-sequence
whose first character represents the total length of the key-
sequence, including the length specifier itself. It returns NULL
upon failure.
Example
Consider the following examples:
SLang_process_keystring ("^X^C");
SLang_process_keystring ("^[[A");
The first example will return a pointer to a buffer of three char-
acters whose ASCII values are given by {3,24,3}. Similarly, the
second example will return a pointer to the four characters
{4,27,91,65}. Finally, the result of
SLang_process_keystring ("^[^(ku)");
will depend upon the termcap/terminfo capability "ku", which repre-
sents the escape sequence associated with the terminal's UP arrow
key. For an ANSI terminal whose UP arrow produces "ESC [ A", the
result will be 5,27,27,91,65.
Notes
SLang_process_keystring returns a pointer to a static area that
will be overwritten on subsequent calls.
See Also
SLang_define_key, SLang_make_keystring
11.10. SLang_make_keystring
Synopsis
Make a printable key sequence
Usage
char *SLang_make_keystring (unsigned char *ks);
Description
The SLang_make_keystring function takes a raw key sequence ks
and converts it to a printable form by converting characters
such as ASCII 1 (ctrl-A) to ^A. That is, it performs the
opposite function of SLang_process_keystring.
Notes
This function returns a pointer to a static area that will be
overwritten on the next call to SLang_make_keystring.
See Also
SLang_process_keystring
12. Undocumented Functions
The following functions are not yet documented:
12.1. SLprep_open_prep
Synopsis
??
Usage
int SLprep_open_prep (SLPreprocess_Type *);
Description
??
See Also
??
12.2. SLprep_close_prep
Synopsis
??
Usage
void SLprep_close_prep (SLPreprocess_Type *);
Description
??
See Also
??
12.3. SLprep_line_ok
Synopsis
??
Usage
int SLprep_line_ok (char *, SLPreprocess_Type *);
Description
??
See Also
??
12.4. SLdefine_for_ifdef
Synopsis
??
Usage
int SLdefine_for_ifdef (char *);
Description
??
See Also
??
12.5. SLang_Read_Line_Type * SLang_rline_save_line
(SLang_RLine_Info_Type *);
Synopsis
??
Usage
SLang_Read_Line_Type * SLang_rline_save_line
(SLang_RLine_Info_Type *);
Description
??
See Also
??
12.6. int SLang_init_readline (SLang_RLine_Info_Type *);
Synopsis
??
Usage
int SLang_init_readline (SLang_RLine_Info_Type *);
Description
??
See Also
??
12.7. int SLang_read_line (SLang_RLine_Info_Type *);
Synopsis
??
Usage
int SLang_read_line (SLang_RLine_Info_Type *);
Description
??
See Also
??
12.8. int SLang_rline_insert (char *);
Synopsis
??
Usage
int SLang_rline_insert (char *);
Description
??
See Also
??
12.9. void SLrline_redraw (SLang_RLine_Info_Type *);
Synopsis
??
Usage
void SLrline_redraw (SLang_RLine_Info_Type *);
Description
??
See Also
??
12.10. int SLtt_flush_output (void);
Synopsis
??
Usage
int SLtt_flush_output (void);
Description
??
See Also
??
12.11. void SLtt_set_scroll_region(int, int);
Synopsis
??
Usage
void SLtt_set_scroll_region(int, int);
Description
??
See Also
??
12.12. void SLtt_reset_scroll_region(void);
Synopsis
??
Usage
void SLtt_reset_scroll_region(void);
Description
??
See Also
??
12.13. void SLtt_reverse_video (int);
Synopsis
??
Usage
void SLtt_reverse_video (int);
Description
??
See Also
??
12.14. void SLtt_bold_video (void);
Synopsis
??
Usage
void SLtt_bold_video (void);
Description
??
See Also
??
12.15. void SLtt_begin_insert(void);
Synopsis
??
Usage
void SLtt_begin_insert(void);
Description
??
See Also
??
12.16. void SLtt_end_insert(void);
Synopsis
??
Usage
void SLtt_end_insert(void);
Description
??
See Also
??
12.17. void SLtt_del_eol(void);
Synopsis
??
Usage
void SLtt_del_eol(void);
Description
??
See Also
??
12.18. void SLtt_goto_rc (int, int);
Synopsis
??
Usage
void SLtt_goto_rc (int, int);
Description
??
See Also
??
12.19. void SLtt_delete_nlines(int);
Synopsis
??
Usage
void SLtt_delete_nlines(int);
Description
??
See Also
??
12.20. void SLtt_delete_char(void);
Synopsis
??
Usage
void SLtt_delete_char(void);
Description
??
See Also
??
12.21. void SLtt_erase_line(void);
Synopsis
??
Usage
void SLtt_erase_line(void);
Description
??
See Also
??
12.22. void SLtt_normal_video(void);
Synopsis
??
Usage
void SLtt_normal_video(void);
Description
??
See Also
??
12.23. void SLtt_cls(void);
Synopsis
??
Usage
void SLtt_cls(void);
Description
??
See Also
??
12.24. void SLtt_beep(void);
Synopsis
??
Usage
void SLtt_beep(void);
Description
??
See Also
??
12.25. void SLtt_reverse_index(int);
Synopsis
??
Usage
void SLtt_reverse_index(int);
Description
??
See Also
??
12.26. void SLtt_smart_puts(unsigned short *, unsigned short *, int,
int);
Synopsis
??
Usage
void SLtt_smart_puts(unsigned short *, unsigned short *, int,
int);
Description
??
See Also
??
12.27. void SLtt_write_string (char *);
Synopsis
??
Usage
void SLtt_write_string (char *);
Description
??
See Also
??
12.28. void SLtt_putchar(char);
Synopsis
??
Usage
void SLtt_putchar(char);
Description
??
See Also
??
12.29. int SLtt_init_video (void);
Synopsis
??
Usage
int SLtt_init_video (void);
Description
??
See Also
??
12.30. int SLtt_reset_video (void);
Synopsis
??
Usage
int SLtt_reset_video (void);
Description
??
See Also
??
12.31. void SLtt_get_terminfo(void);
Synopsis
??
Usage
void SLtt_get_terminfo(void);
Description
??
See Also
??
12.32. void SLtt_get_screen_size (void);
Synopsis
??
Usage
void SLtt_get_screen_size (void);
Description
??
See Also
??
12.33. int SLtt_set_cursor_visibility (int);
Synopsis
??
Usage
int SLtt_set_cursor_visibility (int);
Description
??
See Also
??
12.34. int SLtt_initialize (char *);
Synopsis
??
Usage
int SLtt_initialize (char *);
Description
??
See Also
??
12.35. void SLtt_enable_cursor_keys(void);
Synopsis
??
Usage
void SLtt_enable_cursor_keys(void);
Description
??
See Also
??
12.36. void SLtt_set_term_vtxxx(int *);
Synopsis
??
Usage
void SLtt_set_term_vtxxx(int *);
Description
??
See Also
??
12.37. void SLtt_set_color_esc (int, char *);
Synopsis
??
Usage
void SLtt_set_color_esc (int, char *);
Description
??
See Also
??
12.38. void SLtt_wide_width(void);
Synopsis
??
Usage
void SLtt_wide_width(void);
Description
??
See Also
??
12.39. void SLtt_narrow_width(void);
Synopsis
??
Usage
void SLtt_narrow_width(void);
Description
??
See Also
??
12.40. int SLtt_set_mouse_mode (int, int);
Synopsis
??
Usage
int SLtt_set_mouse_mode (int, int);
Description
??
See Also
??
12.41. void SLtt_set_alt_char_set (int);
Synopsis
??
Usage
void SLtt_set_alt_char_set (int);
Description
??
See Also
??
12.42. int SLtt_write_to_status_line (char *, int);
Synopsis
??
Usage
int SLtt_write_to_status_line (char *, int);
Description
??
See Also
??
12.43. void SLtt_disable_status_line (void);
Synopsis
??
Usage
void SLtt_disable_status_line (void);
Description
??
See Also
??
12.44. char *SLtt_tgetstr (char *);
Synopsis
??
Usage
char *SLtt_tgetstr (char *);
Description
??
See Also
??
12.45. int SLtt_tgetnum (char *);
Synopsis
??
Usage
int SLtt_tgetnum (char *);
Description
??
See Also
??
12.46. int SLtt_tgetflag (char *);
Synopsis
??
Usage
int SLtt_tgetflag (char *);
Description
??
See Also
??
12.47. char *SLtt_tigetent (char *);
Synopsis
??
Usage
char *SLtt_tigetent (char *);
Description
??
See Also
??
12.48. char *SLtt_tigetstr (char *, char **);
Synopsis
??
Usage
char *SLtt_tigetstr (char *, char **);
Description
??
See Also
??
12.49. int SLtt_tigetnum (char *, char **);
Synopsis
??
Usage
int SLtt_tigetnum (char *, char **);
Description
??
See Also
??
12.50. SLtt_Char_Type SLtt_get_color_object (int);
Synopsis
??
Usage
SLtt_Char_Type SLtt_get_color_object (int);
Description
??
See Also
??
12.51. void SLtt_set_color_object (int, SLtt_Char_Type);
Synopsis
??
Usage
void SLtt_set_color_object (int, SLtt_Char_Type);
Description
??
See Also
??
12.52. void SLtt_set_color (int, char *, char *, char *);
Synopsis
??
Usage
void SLtt_set_color (int, char *, char *, char *);
Description
??
See Also
??
12.53. void SLtt_set_mono (int, char *, SLtt_Char_Type);
Synopsis
??
Usage
void SLtt_set_mono (int, char *, SLtt_Char_Type);
Description
??
See Also
??
12.54. void SLtt_add_color_attribute (int, SLtt_Char_Type);
Synopsis
??
Usage
void SLtt_add_color_attribute (int, SLtt_Char_Type);
Description
??
See Also
??
12.55. void SLtt_set_color_fgbg (int, SLtt_Char_Type,
SLtt_Char_Type);
Synopsis
??
Usage
void SLtt_set_color_fgbg (int, SLtt_Char_Type, SLtt_Char_Type);
Description
??
See Also
??
12.56. int SLkp_define_keysym (char *, unsigned int);
Synopsis
??
Usage
int SLkp_define_keysym (char *, unsigned int);
Description
??
See Also
??
12.57. int SLkp_init (void);
Synopsis
??
Usage
int SLkp_init (void);
Description
??
See Also
??
12.58. int SLkp_getkey (void);
Synopsis
??
Usage
int SLkp_getkey (void);
Description
??
See Also
??
12.59. int SLscroll_find_top (SLscroll_Window_Type *);
Synopsis
??
Usage
int SLscroll_find_top (SLscroll_Window_Type *);
Description
??
See Also
??
12.60. int SLscroll_find_line_num (SLscroll_Window_Type *);
Synopsis
??
Usage
int SLscroll_find_line_num (SLscroll_Window_Type *);
Description
??
See Also
??
12.61. unsigned int SLscroll_next_n (SLscroll_Window_Type *, unsigned
int);
Synopsis
??
Usage
unsigned int SLscroll_next_n (SLscroll_Window_Type *, unsigned
int);
Description
??
See Also
??
12.62. unsigned int SLscroll_prev_n (SLscroll_Window_Type *, unsigned
int);
Synopsis
??
Usage
unsigned int SLscroll_prev_n (SLscroll_Window_Type *, unsigned
int);
Description
??
See Also
??
12.63. int SLscroll_pageup (SLscroll_Window_Type *);
Synopsis
??
Usage
int SLscroll_pageup (SLscroll_Window_Type *);
Description
??
See Also
??
12.64. int SLscroll_pagedown (SLscroll_Window_Type *);
Synopsis
??
Usage
int SLscroll_pagedown (SLscroll_Window_Type *);
Description
??
See Also
??
12.65. SLSig_Fun_Type *SLsignal (int, SLSig_Fun_Type *);
Synopsis
??
Usage
SLSig_Fun_Type *SLsignal (int, SLSig_Fun_Type *);
Description
??
See Also
??
12.66. SLSig_Fun_Type *SLsignal_intr (int, SLSig_Fun_Type *);
Synopsis
??
Usage
SLSig_Fun_Type *SLsignal_intr (int, SLSig_Fun_Type *);
Description
??
See Also
??
12.67. int SLsig_block_signals (void);
Synopsis
??
Usage
int SLsig_block_signals (void);
Description
??
See Also
??
12.68. int SLsig_unblock_signals (void);
Synopsis
??
Usage
int SLsig_unblock_signals (void);
Description
??
See Also
??
12.69. int SLsystem (char *);
Synopsis
??
Usage
int SLsystem (char *);
Description
??
See Also
??
12.70. void SLadd_at_handler (long *, char *);
Synopsis
??
Usage
void SLadd_at_handler (long *, char *);
Description
??
See Also
??
12.71. void SLang_define_case(int *, int *);
Synopsis
??
Usage
void SLang_define_case(int *, int *);
Description
??
See Also
??
12.72. void SLang_init_case_tables (void);
Synopsis
??
Usage
void SLang_init_case_tables (void);
Description
??
See Also
??
12.73. unsigned char *SLang_regexp_match(unsigned char *, unsigned
int, SLRegexp_Type *);
Synopsis
??
Usage
unsigned char *SLang_regexp_match(unsigned char *, unsigned int,
SLRegexp_Type *);
Description
??
See Also
??
12.74. int SLang_regexp_compile (SLRegexp_Type *);
Synopsis
??
Usage
int SLang_regexp_compile (SLRegexp_Type *);
Description
??
See Also
??
12.75. char *SLregexp_quote_string (char *, char *, unsigned int);
Synopsis
??
Usage
char *SLregexp_quote_string (char *, char *, unsigned int);
Description
??
See Also
??
12.76. int SLcmd_execute_string (char *, SLcmd_Cmd_Table_Type *);
Synopsis
??
Usage
int SLcmd_execute_string (char *, SLcmd_Cmd_Table_Type *);
Description
??
See Also
??
12.77. SLcomplex_abs
Synopsis
Returns the norm of a complex number
Usage
double SLcomplex_abs (double *z)}
Description
The SLcomplex_abs function returns the absolute value or the
norm of the complex number given by z.
See Also
SLcomplex_times
12.78. double *SLcomplex_times (double *, double *, double *);
Synopsis
??
Usage
double *SLcomplex_times (double *, double *, double *);
Description
??
See Also
??
12.79. double *SLcomplex_divide (double *, double *, double *);
Synopsis
??
Usage
double *SLcomplex_divide (double *, double *, double *);
Description
??
See Also
??
12.80. double *SLcomplex_sin (double *, double *);
Synopsis
??
Usage
double *SLcomplex_sin (double *, double *);
Description
??
See Also
??
12.81. double *SLcomplex_cos (double *, double *);
Synopsis
??
Usage
double *SLcomplex_cos (double *, double *);
Description
??
See Also
??
12.82. double *SLcomplex_tan (double *, double *);
Synopsis
??
Usage
double *SLcomplex_tan (double *, double *);
Description
??
See Also
??
12.83. double *SLcomplex_asin (double *, double *);
Synopsis
??
Usage
double *SLcomplex_asin (double *, double *);
Description
??
See Also
??
12.84. double *SLcomplex_acos (double *, double *);
Synopsis
??
Usage
double *SLcomplex_acos (double *, double *);
Description
??
See Also
??
12.85. double *SLcomplex_atan (double *, double *);
Synopsis
??
Usage
double *SLcomplex_atan (double *, double *);
Description
??
See Also
??
12.86. double *SLcomplex_exp (double *, double *);
Synopsis
??
Usage
double *SLcomplex_exp (double *, double *);
Description
??
See Also
??
12.87. double *SLcomplex_log (double *, double *);
Synopsis
??
Usage
double *SLcomplex_log (double *, double *);
Description
??
See Also
??
12.88. double *SLcomplex_log10 (double *, double *);
Synopsis
??
Usage
double *SLcomplex_log10 (double *, double *);
Description
??
See Also
??
12.89. double *SLcomplex_sqrt (double *, double *);
Synopsis
??
Usage
double *SLcomplex_sqrt (double *, double *);
Description
??
See Also
??
12.90. double *SLcomplex_sinh (double *, double *);
Synopsis
??
Usage
double *SLcomplex_sinh (double *, double *);
Description
??
See Also
??
12.91. double *SLcomplex_cosh (double *, double *);
Synopsis
??
Usage
double *SLcomplex_cosh (double *, double *);
Description
??
See Also
??
12.92. double *SLcomplex_tanh (double *, double *);
Synopsis
??
Usage
double *SLcomplex_tanh (double *, double *);
Description
??
See Also
??
12.93. double *SLcomplex_pow (double *, double *, double *);
Synopsis
??
Usage
double *SLcomplex_pow (double *, double *, double *);
Description
??
See Also
??
12.94. double SLmath_hypot (double x, double y);
Synopsis
??
Usage
double SLmath_hypot (double x, double y);
Description
??
See Also
??
extern double *SLcomplex_asinh (double *, double *);
12.95. double *SLcomplex_acosh (double *, double *);
Synopsis
??
Usage
double *SLcomplex_acosh (double *, double *);
Description
??
See Also
??
12.96. double *SLcomplex_atanh (double *, double *);
Synopsis
??
Usage
double *SLcomplex_atanh (double *, double *);
Description
??
See Also
??
12.97. char *SLdebug_malloc (unsigned long);
Synopsis
??
Usage
char *SLdebug_malloc (unsigned long);
Description
??
See Also
??
12.98. char *SLdebug_calloc (unsigned long, unsigned long);
Synopsis
??
Usage
char *SLdebug_calloc (unsigned long, unsigned long);
Description
??
See Also
??
12.99. char *SLdebug_realloc (char *, unsigned long);
Synopsis
??
Usage
char *SLdebug_realloc (char *, unsigned long);
Description
??
See Also
??
12.100. void SLdebug_free (char *);
Synopsis
??
Usage
void SLdebug_free (char *);
Description
??
See Also
??
12.101. void SLmalloc_dump_statistics (void);
Synopsis
??
Usage
void SLmalloc_dump_statistics (void);
Description
??
See Also
??
12.102. char *SLstrcpy(register char *, register char *);
Synopsis
??
Usage
char *SLstrcpy(register char *, register char *);
Description
??
See Also
??
12.103. int SLstrcmp(register char *, register char *);
Synopsis
??
Usage
int SLstrcmp(register char *, register char *);
Description
??
See Also
??
12.104. char *SLstrncpy(char *, register char *, register int);
Synopsis
??
Usage
char *SLstrncpy(char *, register char *, register int);
Description
??
See Also
??
12.105. void SLmemset (char *, char, int);
Synopsis
??
Usage
void SLmemset (char *, char, int);
Description
??
See Also
??
12.106. void SLexpand_escaped_string (register char *, register char
*, register char *);
Synopsis
??
Usage
void SLexpand_escaped_string (register char *, register char *,
register char *);
Description
??
See Also
??
12.107. void SLmake_lut (unsigned char *, unsigned char *, unsigned
char);
Synopsis
??
Usage
void SLmake_lut (unsigned char *, unsigned char *, unsigned
char);
Description
??
See Also
??
12.108. int SLang_guess_type (char *);
Synopsis
??
Usage
int SLang_guess_type (char *);
Description
??
See Also
??
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