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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253/****strcmp.c - routine to compare two strings (for equal, less, or greater)** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Compares two string, determining their ordinal order.********************************************************************************/
#include <string.h>
#pragma function(strcmp)
/****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) == 0 && *dst) { ++src, ++dst; }
return ((-ret) < 0) - (ret < 0); // (if positive) - (if negative) generates branchless code}