freebsd man page for strlen

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