user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/tests/ansi/utf8.c

@@ -0,0 +1,78 @@
+#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');
+
+	// Check wcrtomb.
+	char representation[MB_CUR_MAX];
+	representation[0] = '\0';
+	mbstate_t state;
+	memset(&state, 0, sizeof(state));
+	assert(wcrtomb(representation, L'1', &state) == 1);
+	assert(wcrtomb(representation, L'ß', &state) == 2);
+	assert(!strncmp(representation, "\xC3\x9F", 2));
+	assert(wcrtomb(representation, L'ࠑ', &state) == 3);
+	assert(!strncmp(representation, "\xE0\xA0\x91", 3));
+	assert(wcrtomb(representation, L'𒂲', &state) == 4);
+	assert(!strncmp(representation, "\xF0\x92\x82\xB2", 4));
+
+	return 0;
+}