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