mirror of https://github.com/AxioDL/metaforce.git
37 lines
946 B
C++
37 lines
946 B
C++
|
#include <stdlib.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <string>
|
||
|
|
#include "HECL/winsupport.hpp"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The memmem() function finds the start of the first occurrence of the
|
||
|
|
* substring 'needle' of length 'nlen' in the memory area 'haystack' of
|
||
|
|
* length 'hlen'.
|
||
|
|
*
|
||
|
|
* The return value is a pointer to the beginning of the sub-string, or
|
||
|
|
* NULL if the substring is not found.
|
||
|
|
*/
|
||
|
|
void *memmem(const void *haystack, size_t hlen, const void *needle, size_t nlen)
|
||
|
|
{
|
||
|
|
int needle_first;
|
||
|
|
const uint8_t *p = static_cast<const uint8_t*>(haystack);
|
||
|
|
size_t plen = hlen;
|
||
|
|
|
||
|
|
if (!nlen)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
needle_first = *(unsigned char *)needle;
|
||
|
|
|
||
|
|
while (plen >= nlen && (p = static_cast<const uint8_t*>(memchr(p, needle_first, plen - nlen + 1))))
|
||
|
|
{
|
||
|
|
if (!memcmp(p, needle, nlen))
|
||
|
|
return (void *)p;
|
||
|
|
|
||
|
|
p++;
|
||
|
|
plen = hlen - (p - static_cast<const uint8_t*>(haystack));
|
||
|
|
}
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|