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/*

/*

FUNCTION

FUNCTION

        <<strnlen>>---character string length

        <<strnlen>>---character string length

INDEX

INDEX

        strnlen

        strnlen

ANSI_SYNOPSIS

ANSI_SYNOPSIS

        #include <string.h>

        #include <string.h>

        size_t strnlen(const char *<[str]>, size_t <[n]>);

        size_t strnlen(const char *<[str]>, size_t <[n]>);

TRAD_SYNOPSIS

TRAD_SYNOPSIS

        #include <string.h>

        #include <string.h>

        size_t strnlen(<[str]>, <[n]>)

        size_t strnlen(<[str]>, <[n]>)

        char *<[src]>;

        char *<[src]>;

        size_t <[n]>;

        size_t <[n]>;

DESCRIPTION

DESCRIPTION

        The <<strnlen>> function works out the length of the string

        The <<strnlen>> function works out the length of the string

        starting at <<*<[str]>>> by counting chararacters until it

        starting at <<*<[str]>>> by counting chararacters until it

        reaches a NUL character or the maximum: <[n]> number of

        reaches a NUL character or the maximum: <[n]> number of

        characters have been inspected.

        characters have been inspected.

RETURNS

RETURNS

        <<strnlen>> returns the character count or <[n]>.

        <<strnlen>> returns the character count or <[n]>.

PORTABILITY

PORTABILITY

<<strnlen>> is a Gnu extension.

<<strnlen>> is a Gnu extension.

<<strnlen>> requires no supporting OS subroutines.

<<strnlen>> requires no supporting OS subroutines.

*/

*/

#undef __STRICT_ANSI__

#undef __STRICT_ANSI__

#include <_ansi.h>

#include <_ansi.h>

#include <string.h>

#include <string.h>

size_t

size_t

_DEFUN (strnlen, (str, n),

_DEFUN (strnlen, (str, n),

        _CONST char *str _AND

        _CONST char *str _AND

        size_t n)

        size_t n)

{

{

  _CONST char *start = str;

  _CONST char *start = str;

  while (*str && n-- > 0)

  while (*str && n-- > 0)

    str++;

    str++;

  return str - start;

  return str - start;

}

}