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IEEE designed POSIX around the common structure of the major competing variants of the Unix system, publishing the first POSIX standard in 1988.
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strnlen(3) [freebsd man page]

STRLEN(3)						   BSD Library Functions Manual 						 STRLEN(3)

NAME
strlen, strnlen -- find length of string LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <string.h> size_t strlen(const char *s); size_t strnlen(const char *s, size_t maxlen); DESCRIPTION
The strlen() function computes the length of the string s. The strnlen() function attempts to compute the length of s, but never scans beyond the first maxlen bytes of s. RETURN VALUES
The strlen() function returns the number of characters that precede the terminating NUL character. The strnlen() function returns either the same result as strlen() or maxlen, whichever is smaller. SEE ALSO
string(3), wcslen(3), wcswidth(3) STANDARDS
The strlen() function conforms to ISO/IEC 9899:1990 (``ISO C90''). The strnlen() function conforms to IEEE Std 1003.1-2008 (``POSIX.1''). BSD
February 28, 2009 BSD

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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)

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