/*
    (C) 1995-96 AROS - The Amiga Replacement OS
    $Id: strncmp.c,v 1.3 1997/07/13 12:56:14 iaint Exp $

    Desc: ANSI C function strncmp()
    Lang: english
*/

/*****************************************************************************

    NAME */
#include <string.h>

	int strncmp (

/*  SYNOPSIS */
	const char * str1,
	const char * str2,
	size_t	     n)

/*  FUNCTION
	Calculate str1 - str2 for upto n chars or upto the first 0 byte.

    INPUTS
	str1, str2 - Strings to compare

    RESULT
	The difference of the strings. The difference is 0, if both are
	equal, < 0 if str1 < str2 and > 0 if str1 > str2. Note that
	it may be greater then 1 or less than -1.

    NOTES
	This function is not part of a library and may thus be called
	any time.

    EXAMPLE

    BUGS

    SEE ALSO

    INTERNALS

    HISTORY
	24-12-95    digulla created

******************************************************************************/
{
    /*
	If n == 0, then this will not be initialized, even though it is
	returned at the end, so we say two strings of 0 length are equal
    */
    int diff = 0;

    /* No need to check *str2 since: a) str1 is equal str2 (both are 0),
	then *str1 will terminate the loop b) str1 and str2 are not equal
	(eg. *str2 is 0), then the diff part will be FALSE. I calculate
	the diff first since a) it's more probable that the first chars
	will be different and b) I don't need to initialize diff then. */
    while (n && !(diff = *str1 - *str2) && *str1)
    {
	/* advance both strings. I do that here, since doing it in the
	    check above would mean to advance the strings once too often */
	str1 ++;
	str2 ++;
	n --;
    }

    /* Now return the difference. */
    return diff;
} /* strcmp */