strlen
Section: C Library Functions (3)
Updated: 2023-02-05
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NAME
strlen - calculate the length of a string
LIBRARY
Standard C library
(libc, -lc)
SYNOPSIS
#include <string.h>
size_t strlen(const char *s);
DESCRIPTION
The
strlen()
function calculates the length of the string pointed to by
s,
excluding the terminating null byte ('\0').
RETURN VALUE
The
strlen()
function returns the number of bytes in the string pointed to by
s.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
strlen()
| Thread safety | MT-Safe
|
STANDARDS
POSIX.1-2001, POSIX.1-2008, C99, C11, SVr4, 4.3BSD.
NOTES
In cases where the input buffer may not contain
a terminating null byte,
strnlen(3)
should be used instead.
SEE ALSO
string(3),
strnlen(3),
wcslen(3),
wcsnlen(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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