strstr.c

来自「OMAP1030 处理器的ARM 侧硬件测试代码 OMAP1030 是TI」· C语言 代码 · 共 24 行

/****************************************************************************/
/*  strstr v2.24                                                           */
/*  Copyright (c) 1993-2002  Texas Instruments Incorporated                 */
/****************************************************************************/
#include <string.h>

_CODE_ACCESS char *strstr(register const char *string1, const char *string2)
{
     register char cp1, cp2;
     register const char *pos = string1;

     while (*string1)         /* FOR EACH STRING IN SOURCE STRING */
     {
         register const char *cmp = string2;

         while (((cp1 = *string1++) == (cp2 = *cmp++)) && cp1);
	 if (cp2 == 0) return (char *)pos;
	 string1 = ++pos;
     }
     return (0);
}