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#include <string.h>
#include <assert.h>
int main() {
char buf[4];
// stpncpy
assert(stpncpy(buf, "", 4) == buf);
assert(!strcmp(buf, ""));
assert(stpncpy(buf, "123", 4) == buf + 3);
assert(!strcmp(buf, "123"));
assert(stpncpy(buf, "12", 4) == buf + 2);
assert(buf[0] == '1' && buf[1] == '2' && buf[2] == '\0' && buf[3] == '\0');
assert(stpncpy(buf, "123456", 4) == buf + 4);
assert(buf[0] == '1' && buf[1] == '2' && buf[2] == '3' && buf[3] == '4');
// stpcpy
assert(stpcpy(buf, "") == buf);
assert(!strcmp(buf, ""));
assert(stpcpy(buf, "12") == buf + 2);
assert(!strcmp(buf, "12"));
assert(stpcpy(buf, "123") == buf + 3);
assert(!strcmp(buf, "123"));
}
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