/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
void *
libsimple_memcmove(void *d_, const void *s_, int c_, size_t n)
{
char *d = d_, c = (char)c_, *p;
const char *s = s_;
if (d <= s) {
for (; n; n--, s++)
if ((*d++ = *s) == c)
return d;
} else {
for (p = *(char **)(void *)&s; n; n--, p++) {
if (*p == c) {
n = (size_t)(p - s);
p = &d[n + 1];
do { d[n] = s[n]; } while (n--);
return p;
}
}
for (n = (size_t)(p - s); n;) {
n--;
d[n] = s[n];
}
}
return NULL;
}
#else
#include "test.h"
int
main(void)
{
char buf[1024];
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[5], &buf[5], 'o', 5) == &buf[5 + 5]);
assert(!strncmp(buf, "-----hello-", 11));
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[5], &buf[5], 'l', 5) == &buf[5 + 3]);
assert(!strncmp(buf, "-----hello-", 11));
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[5], &buf[5], 'x', 5) == NULL);
assert(!strncmp(buf, "-----hello-", 11));
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[3], &buf[5], 'o', 5) == &buf[3 + 5]);
assert(!strncmp(buf, "---hellolo-", 11));
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[3], &buf[5], 'l', 5) == &buf[3 + 3]);
assert(!strncmp(buf, "---helello-", 11));
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[3], &buf[5], 'x', 5) == NULL);
assert(!strncmp(buf, "---hellolo-", 11));
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[8], &buf[5], 'o', 5) == &buf[8 + 5]);
assert(!strncmp(buf, "-----helhello-", 14));
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[8], &buf[5], 'l', 5) == &buf[8 + 3]);
assert(!strncmp(buf, "-----helhel-", 12));
memset(buf, '-', sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
stpcpy(&buf[5], "hello")[0] = '-';
assert(libsimple_memcmove(&buf[8], &buf[5], 'x', 5) == NULL);
assert(!strncmp(buf, "-----helhello-", 14));
return 0;
}
#endif
