linux man page for strnlen

STRNLEN(3)						     Linux Programmer's Manual							STRNLEN(3)

NAME
       strnlen - determine the length of a fixed-size string

SYNOPSIS
       #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

DESCRIPTION
       The strnlen() function returns the number of characters in the string pointed to by s, not including the terminating '' character, but at
       most maxlen.  In doing this, strnlen() looks only at the first maxlen characters at s and never beyond s+maxlen.

RETURN VALUE
       The strnlen() function returns strlen(s), if that is less than maxlen, or maxlen if there is no '' character among the first maxlen char-
       acters pointed to by s.

CONFORMING TO
       This function is a GNU extension.

SEE ALSO
       strlen(3), feature_test_macros(7)

COLOPHON
       This  page is part of release 3.27 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)