/* 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)
{
switch (subn) {
case 0:
return (void *)hay_;
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_;
size_t i;
for (hay += hayn * subn; hayn--;) {
hay -= subn;
for (i = 0; i < subn; i++)
if (hay[i] != sub[i])
goto next;
return hay;
next:;
}
break;
}
}
return NULL;
}
#else
#include "test.h"
int
main(void)
{
assert(!strcmpnul(libsimple_memrelem("12345634", 8, "", 0), "12345634"));
assert(!strcmpnul(libsimple_memrelem("12345634", 0, "", 0), "12345634"));
assert(!strcmpnul(libsimple_memrelem("12345634", 8, "3", 1), "34"));
assert(!libsimple_memrelem("12345634", 8, "x", 1));
assert(!strcmpnul(libsimple_memrelem("13456342", 8, "3", 1), "342"));
assert(!libsimple_memrelem("12345634", 0, "3", 1));
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("abcd1234abcd1234", 4, "1234", 4), "1234"));
assert(!libsimple_memrelem("abcd1234abcd1234", 4, "zzzz", 4));
assert(!libsimple_memrelem("cd1234abcd1234ab", 4, "1234", 4));
assert(!libsimple_memrelem("abcd1234abcd1234", 0, "1234", 4));
assert(!strcmpnul(libsimple_memrelem("abcdefgh12345678abcdefgh12345678", 4, "12345678", 8), "12345678"));
assert(!libsimple_memrelem("abcdefgh12345678abcdefgh12345678", 4, "zzzzzzzz", 8));
assert(!libsimple_memrelem("efgh12345678abcdefgh12345678abcd", 4, "12345678", 8));
assert(!libsimple_memrelem("abcdefgh12345678abcdefgh12345678", 0, "12345678", 8));
assert(!strcmpnul(libsimple_memrelem("abc123abc123", 4, "123", 3), "123"));
assert(!libsimple_memrelem("abc123abc123", 4, "zzz", 3));
assert(!libsimple_memrelem("bc123abc123a", 4, "123", 3));
assert(!libsimple_memrelem("abc123abc123", 0, "123", 3));
assert(!strcmpnul(libsimple_memrelem("-a-aa--a", 4, "a-", 2), "a--a"));
assert(!strcmpnul(libsimple_memrelem("--a--aa----a", 4, "a--", 3), "a----a"));
assert(!strcmpnul(libsimple_memrelem("---a---aa------a", 4, "a---", 4), "a------a"));
assert(!strcmpnul(libsimple_memrelem("-------a-------aa--------------a", 4, "a-------", 8), "a--------------a"));
return 0;
}
#endif
