72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/***
|
|
*strcmp.c - routine to compare two strings (for equal, less, or greater)
|
|
*
|
|
* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* Compares two string, determining their lexical order.
|
|
*
|
|
*Revision History:
|
|
* 05-31-89 JCR C version created.
|
|
* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
|
|
* copyright.
|
|
* 10-01-90 GJF New-style function declarator.
|
|
* 04-01-91 SRW Add #pragma function for i386 _WIN32_ and _CRUISER_
|
|
* builds
|
|
* 10-11-91 GJF Bug fix! Comparison of final bytes must use unsigned
|
|
* chars.
|
|
* 09-01-93 GJF Replaced _CALLTYPE1 with __cdecl.
|
|
* 12-03-93 GJF Turn on #pragma function for all MS front-ends (esp.,
|
|
* Alpha compiler).
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <cruntime.h>
|
|
#include <string.h>
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma function(strcmp)
|
|
#endif
|
|
|
|
/***
|
|
*strcmp - compare two strings, returning less than, equal to, or greater than
|
|
*
|
|
*Purpose:
|
|
* STRCMP compares two strings and returns an integer
|
|
* to indicate whether the first is less than the second, the two are
|
|
* equal, or whether the first is greater than the second.
|
|
*
|
|
* Comparison is done byte by byte on an UNSIGNED basis, which is to
|
|
* say that Null (0) is less than any other character (1-255).
|
|
*
|
|
*Entry:
|
|
* const char * src - string for left-hand side of comparison
|
|
* const char * dst - string for right-hand side of comparison
|
|
*
|
|
*Exit:
|
|
* returns -1 if src < dst
|
|
* returns 0 if src == dst
|
|
* returns +1 if src > dst
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
int __cdecl strcmp (
|
|
const char * src,
|
|
const char * dst
|
|
)
|
|
{
|
|
int ret = 0 ;
|
|
|
|
while( ! (ret = *(unsigned char *)src - *(unsigned char *)dst) && *dst)
|
|
++src, ++dst;
|
|
|
|
if ( ret < 0 )
|
|
ret = -1 ;
|
|
else if ( ret > 0 )
|
|
ret = 1 ;
|
|
|
|
return( ret );
|
|
}
|