strcmp.c

VXWORKS源代码

/* strcmp.c - compare two strings, string */

/* Copyright 1992-1993 Wind River Systems, Inc. */

/*
modification history
--------------------
01c,25feb93,jdi  documentation cleanup for 5.1.
01b,20sep92,smb  documentation additions
01a,08jul92,smb  written and documented.
*/

/*
DESCRIPTION

INCLUDE FILES: string.h

SEE ALSO: American National Standard X3.159-1989

NOMANUAL
*/

#include "vxWorks.h"
#include "string.h"


/*******************************************************************************
*
* strcmp - compare two strings lexicographically (ANSI)
*
* This routine compares string <s1> to string <s2> lexicographically.
*
* INCLUDE FILES: string.h
*
* RETURNS: An integer greater than, equal to, or less than 0,
* according to whether <s1> is lexicographically
* greater than, equal to, or less than <s2>, respectively.
*/

int strcmp
    (
    const char * s1,   /* string to compare */
    const char * s2    /* string to compare <s1> to */
    )
    {
    while (*s1++ == *s2++)
	if (s1 [-1] == EOS)
	    return (0);

    return ((s1 [-1]) - (s2 [-1]));
    }