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- /* strstr function */
- #include <string.h>
-
- char *(strstr)(const char *s1, const char *s2)
- { /* find first occurrence of s2[] in s1[] */
- if (*s2 == '\0')
- return ((char *)s1);
- for (; (s1 = strchr(s1, *s2)) != NULL; ++s1)
- { /* match rest of prefix */
- const char *sc1, *sc2;
-
- for (sc1 = s1, sc2 = s2; ; )
- if (*++sc2 == '\0')
- return ((char *)s1);
- else if (*++sc1 != *sc2)
- break;
- }
- return (NULL);
- }
-
-