strchr
Section: C Library Functions (3)
Updated: 2023-02-05
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NAME
strchr, strrchr, strchrnul - locate character in string
LIBRARY
Standard C library
(libc, -lc)
SYNOPSIS
#include <string.h>
char *strchr(const char *s, int c);
char *strrchr(const char *s, int c);
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <string.h>
char *strchrnul(const char *s, int c);
DESCRIPTION
The
strchr()
function returns a pointer to the first occurrence
of the character
c
in the string
s.
The
strrchr()
function returns a pointer to the last occurrence
of the character
c
in the string
s.
The
strchrnul()
function is like
strchr()
except that if
c
is not found in
s,
then it returns a pointer to the null byte
at the end of
s,
rather than NULL.
Here "character" means "byte"; these functions do not work with
wide or multibyte characters.
RETURN VALUE
The
strchr()
and
strrchr()
functions return a pointer to
the matched character or NULL if the character is not found.
The terminating null byte is considered part of the string,
so that if
c
is specified as '\0',
these functions return a pointer to the terminator.
The
strchrnul()
function returns a pointer to the matched character,
or a pointer to the null byte at the end of
s
(i.e.,
s+strlen(s))
if the character is not found.
VERSIONS
strchrnul()
was added in glibc 2.1.1.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
Interface | Attribute | Value
|
strchr(),
strrchr(),
strchrnul()
| Thread safety | MT-Safe
|
STANDARDS
strchr(),
strrchr():
POSIX.1-2001, POSIX.1-2008, C99, SVr4, 4.3BSD.
strchrnul()
is a GNU extension.
SEE ALSO
memchr(3),
string(3),
strlen(3),
strpbrk(3),
strsep(3),
strspn(3),
strstr(3),
strtok(3),
wcschr(3),
wcsrchr(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- VERSIONS
-
- ATTRIBUTES
-
- STANDARDS
-
- SEE ALSO
-
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