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/* 
FUNCTION
	<<strnlen>>---character string length
 
INDEX
	strnlen
 
ANSI_SYNOPSIS
	#include <string.h>
	size_t strnlen(const char *<[str]>, size_t <[n]>);
 
TRAD_SYNOPSIS
	#include <string.h>
	size_t strnlen(<[str]>, <[n]>)
	char *<[src]>;
	size_t <[n]>;
 
DESCRIPTION
	The <<strnlen>> function works out the length of the string
	starting at <<*<[str]>>> by counting chararacters until it
	reaches a NUL character or the maximum: <[n]> number of
        characters have been inspected.
 
RETURNS
	<<strnlen>> returns the character count or <[n]>.
 
PORTABILITY
<<strnlen>> is a GNU extension.
 
<<strnlen>> requires no supporting OS subroutines.
 
*/
 
#undef __STRICT_ANSI__
#include <_ansi.h>
#include <string.h>
 
size_t
_DEFUN (strnlen, (str, n),
	_CONST char *str _AND
	size_t n)
{
  _CONST char *start = str;
 
  while (n-- > 0 && *str)
    str++;
 
  return str - start;
}