| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | SEE ALSO | COLOPHON | The Linux Programming Interface |
STRNLEN(3) Linux Programmer's Manual STRNLEN(3)
strnlen - determine the length of a fixed-size string
#define _GNU_SOURCE
#include <string.h>
size_t strnlen(const char *s, size_t maxlen);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
strnlen():
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_GNU_SOURCE
The strnlen() function returns the number of characters in the string pointed
to by s, not including the terminating '\0' character, but at most maxlen. In
doing this, strnlen() looks only at the first maxlen characters at s and never
beyond s+maxlen.
The strnlen() function returns strlen(s), if that is less than maxlen, or
maxlen if there is no '\0' character among the first maxlen characters pointed
to by s.
This function is a GNU extension.
strlen(3), feature_test_macros(7)
This page is part of release 3.29 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 2010-09-15 STRNLEN(3)
HTML rendering created 2010-10-19 by Michael Kerrisk, author of The Linux Programming Interface