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#include <string.h>
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/* Return pointer to first occurrence of s2 in s1, NULL if none */
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char *
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strstr(const char *s1, const char *s2)
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{
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	char *p, *pa, *pb;
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	int c0, c;
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	c0 = *s2;
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	if(c0 == 0)
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		return (char *)s1;
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	s2++;
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	for(p=strchr(s1, c0); p; p=strchr(p+1, c0)) {
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		pa = p;
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		for(pb=(char *)s2;; pb++) {
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			c = *pb;
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			if(c == 0)
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				return p;
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			if(c != *++pa)
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				break;
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		}
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	}
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	return 0;
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}
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