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/* Some operating systems might not have memmem. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stddef.h>
#include <string.h>
#ifdef __cplusplus
extern "C" {
#endif
#define memmem my_memmem
void*
memmem(const void* haystack, size_t haystack_len,
const void* needle, size_t needle_len)
{
const unsigned char* s = (const unsigned char*) haystack;
const unsigned char* ends = s + haystack_len - needle_len;
const unsigned char* p = (const unsigned char*) needle;
void* try;
if (needle_len == 0)
return (void*) haystack;
while (s <= ends && (try = memchr(s, *p, ends - s + 1)))
if (memcmp(try, p, needle_len) == 0)
return (void*) try;
else
s = (const unsigned char*) try + 1;
return 0;
}
#ifdef __cplusplus
}
#endif
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