opendarwin man page for strnlen

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

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

SYNOPSIS
       #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:
	       _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, excluding the terminating null byte (''), but at
       most maxlen.  In doing this, strnlen() looks only at the first maxlen characters in the string pointed to by 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 null terminating  ('')  among	the  first
       maxlen characters pointed to by s.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |strnlen() | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO
       POSIX.1-2008.

SEE ALSO
       strlen(3)

COLOPHON
       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2016-03-15								STRNLEN(3)