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#include <assert.h>
static const unsigned char data[] = {0xde, 0xca, 0xfa, 0xde};
static unsigned char buffer[4];
void *memset(void *s, int c, long unsigned n);
void *memcpy(void *restrict dest, const void *restrict src, long unsigned n);
int
main(void)
{
memset(buffer, 0xae, sizeof(data));
for (unsigned i = 0; i < sizeof(data); ++i) assert(buffer[i] == 0xae);
memcpy(buffer, data, sizeof(data));
for (unsigned i = 0; i < sizeof(data); ++i) assert(buffer[i] == data[i]);
}
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