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/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
#ifndef TEST
void *
libsimple_memrelem(const void *hay_, size_t hayn, const void *sub_, size_t subn)
{
if (!subn)
return (void *)hay_;
switch (subn) {
case 1:
{
uint8_t *hay = (void *)hay_;
uint8_t sub = *(uint8_t *)sub_;
for (hay += hayn; hayn--;)
if (*--hay == sub)
return hay;
break;
}
case 2:
{
uint16_t *hay = (void *)hay_;
uint16_t sub = *(uint16_t *)sub_;
for (hay += hayn; hayn--;)
if (*--hay == sub)
return hay;
break;
}
case 4:
{
uint32_t *hay = (void *)hay_;
uint32_t sub = *(uint32_t *)sub_;
for (hay += hayn; hayn--;)
if (*--hay == sub)
return hay;
break;
}
case 8:
{
uint64_t *hay = (void *)hay_;
uint64_t sub = *(uint64_t *)sub_;
for (hay += hayn; hayn--;)
if (*--hay == sub)
return hay;
break;
}
default:
{
char *hay = (void *)hay_;
const char *sub = sub_;
for (hay += hayn * subn; hayn--;) {
hay -= subn;
if (!memcmp(hay, sub, subn))
return hay;
}
break;
}
}
return NULL;
}
#else
#include "test.h"
int
main(void)
{
assert(!strcmpnul(libsimple_memrelem("12345634", 4, "", 0), "12345634"));
assert(!strcmpnul(libsimple_memrelem("12345634", 4, "34", 2), "34"));
assert(!libsimple_memrelem("12345634", 4, "xx", 2));
assert(!libsimple_memrelem("13456342", 4, "34", 2));
assert(!libsimple_memrelem("12345634", 0, "34", 2));
assert(!strcmpnul(libsimple_memrelem("12345634", 0, "34", 0), "12345634"));
return 0;
}
#endif
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