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

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)