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#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <locale.h>
#if UINTPTR_MAX == UINT64_MAX
#define WCHAR_SPEC ""
#else
#define WCHAR_SPEC "l"
#endif
#define EXPECT(func) ({ \
if(res != expected_ret) { \
printf(#func " decoded %d bytes (expected %d bytes), at %s:%d\n", \
res, expected_ret, __FILE__, line); \
fflush(stdout); \
abort(); \
} \
if(wc != expected) { \
printf(#func " output cp %" WCHAR_SPEC "x (expected cp %" WCHAR_SPEC "x), at %s:%d\n", wc, \
expected, __FILE__, line); \
fflush(stdout); \
abort(); \
} \
})
void verify_decode(const char *input, wchar_t expected, int line) {
wchar_t wc;
int bytes = *input ? strlen(input) : 1;
int expected_ret = *input ? strlen(input) : 0;
// Check mbrtowc().
mbstate_t state;
memset(&state, 0, sizeof(state));
assert(mbrtowc(NULL, NULL, -1, &state) == 0);
int res = mbrtowc(&wc, input, bytes, &state);
EXPECT("mbrtowc");
res = mbrtowc(NULL, input, bytes, &state);
EXPECT("mbrtowc (pwc == NULL)");
// Check mbtowc().
assert(mbtowc(NULL, NULL, -1) == 0);
res = mbtowc(&wc, input, bytes);
EXPECT("mbtowc");
res = mbtowc(NULL, input, bytes);
EXPECT("mbtowc (pwc == NULL)");
}
int main() {
setlocale(LC_ALL, "C.UTF-8");
#define verify_decode(in, out) verify_decode(in, out, __LINE__)
verify_decode("\x24", 0x24);
verify_decode("\xC2\xA2", 0xA2);
verify_decode("\xE0\xA4\xB9", 0x939);
verify_decode("\xE2\x82\xAC", 0x20AC);
verify_decode("\xED\x95\x9C", 0xD55C);
verify_decode("\xF0\x90\x8D\x88", 0x10348);
verify_decode("", L'\0');
}
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