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/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
#ifndef TEST
void *
libsimple_memelem(const void *hay_, size_t hayn, const void *sub_, size_t subn)
{
if (!subn)
return (void *)hay_;
switch (subn) {
case 1:
return memchr(hay_, *(char *)sub_, hayn);
case 2:
{
uint16_t *hay = (void *)hay_;
uint16_t sub = *(uint16_t *)sub_;
for (; hayn--; hay++)
if (*hay == sub)
return hay;
break;
}
case 4:
{
uint32_t *hay = (void *)hay_;
uint32_t sub = *(uint32_t *)sub_;
for (; hayn--; hay++)
if (*hay == sub)
return hay;
break;
}
case 8:
{
uint64_t *hay = (void *)hay_;
uint64_t sub = *(uint64_t *)sub_;
for (; hayn--; hay++)
if (*hay == sub)
return hay;
break;
}
default:
{
char *hay = (void *)hay_;
const char *sub = sub_;
size_t i;
for (; 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_memelem("12345634", 8, "", 0), "12345634"));
assert(!strcmpnul(libsimple_memelem("12345634", 0, "", 0), "12345634"));
assert(!strcmpnul(libsimple_memelem("12345634", 8, "3", 1), "345634"));
assert(!libsimple_memelem("12345634", 8, "x", 1));
assert(!strcmpnul(libsimple_memelem("13456342", 8, "3", 1), "3456342"));
assert(!libsimple_memelem("12345634", 0, "3", 1));
assert(!strcmpnul(libsimple_memelem("12345634", 4, "34", 2), "345634"));
assert(!libsimple_memelem("12345634", 4, "xx", 2));
assert(!libsimple_memelem("13456342", 4, "34", 2));
assert(!libsimple_memelem("12345634", 0, "34", 2));
assert(!strcmpnul(libsimple_memelem("abcd1234abcd1234", 4, "1234", 4), "1234abcd1234"));
assert(!libsimple_memelem("abcd1234abcd1234", 4, "zzzz", 4));
assert(!libsimple_memelem("cd1234abcd1234ab", 4, "1234", 4));
assert(!libsimple_memelem("abcd1234abcd1234", 0, "1234", 4));
assert(!strcmpnul(libsimple_memelem("abcdefgh12345678abcdefgh12345678", 4, "12345678", 8), "12345678abcdefgh12345678"));
assert(!libsimple_memelem("abcdefgh12345678abcdefgh12345678", 4, "zzzzzzzz", 8));
assert(!libsimple_memelem("efgh12345678abcdefgh12345678abcd", 4, "12345678", 8));
assert(!libsimple_memelem("abcdefgh12345678abcdefgh12345678", 0, "12345678", 8));
assert(!strcmpnul(libsimple_memelem("abc123abc123", 4, "123", 3), "123abc123"));
assert(!libsimple_memelem("abc123abc123", 4, "zzz", 3));
assert(!libsimple_memelem("bc123abc123a", 4, "123", 3));
assert(!libsimple_memelem("abc123abc123", 0, "123", 3));
return 0;
}
#endif
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