strcmp.c

一组基础的C库的实现

/* $Id: strcmp.c 262 2006-11-16 07:34:57Z solar $ */

/* Release $Name$ */

/* strcmp( const char *, const char * )

   This file is part of the Public Domain C Library (PDCLib).
   Permission is granted to use, modify, and / or redistribute at will.
*/

#include <string.h>

#ifndef REGTEST

int strcmp( const char * s1, const char * s2 )
{
    while ( ( *s1 ) && ( *s1 == *s2 ) )
    {
        ++s1;
        ++s2;
    }
    return ( *s1 - *s2 );
}

#endif

#ifdef TEST
#include <_PDCLIB_test.h>

int main()
{
    char cmpabcde[] = "abcde";
    char empty[] = "";
    BEGIN_TESTS;
    TESTCASE( strcmp( abcde, cmpabcde ) == 0 );
    TESTCASE( strcmp( abcde, abcdx ) < 0 );
    TESTCASE( strcmp( abcdx, abcde ) > 0 );
    TESTCASE( strcmp( empty, abcde ) < 0 );
    TESTCASE( strcmp( abcde, empty ) > 0 );
    return TEST_RESULTS;
}
#endif