strstr.c

来自「这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统」· C语言 代码 · 共 25 行

#include <string.h>

/*
 * @implemented
 */
char *
strstr(const char *s, const char *find)
{
  char c, sc;
  size_t len;

  if ((c = *find++) != 0)
  {
    len = strlen(find);
    do {
      do {
	if ((sc = *s++) == 0)
	  return 0;
      } while (sc != c);
    } while (strncmp(s, find, len) != 0);
    s--;
  }
  return (char *)((size_t)s);
}