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#include <string.h>
void *memmem(const void *haystack, size_t haystacklen, const void *needle,
size_t needlelen)
{
const unsigned char *p1 = haystack;
const unsigned char *p2 = needle;
while (haystacklen >= needlelen) {
if (!memcmp(p1, p2, needlelen))
return (void *)p1;
p1++;
haystacklen--;
}
return NULL;
}
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