strcmp源码

/****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;    <span style="font-family: Arial, Helvetica, sans-serif;">//直到src和dst当前数值不相等且dst不为\0时退出while</span>         if ( ret < 0 )                ret = -1 ;        else if ( ret > 0 )                ret = 1 ;         return( ret );}