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libc: Add mbtowc()

--- a/include/stdlib.h

+++ b/include/stdlib.h

@@ -11,7 +11,7 @@

 #define _ATEXIT_MAX 32

-#define MB_CUR_MAX 1

+#define MB_CUR_MAX 6

 #define RAND_MAX 32767

 typedef struct {

--- a/src/libc/stdlib/Makefile

+++ b/src/libc/stdlib/Makefile

@@ -18,6 +18,7 @@

 	labs.$O\

 	llabs.$O\

 	malloc.$O\

+	mbtowc.$O\

 	qsort.$O\

 	rand.$O\

 	realloc.$O\

--- /dev/null

+++ b/src/libc/stdlib/mbtowc.c

@@ -1,0 +1,34 @@

+#include <stdlib.h>

+

+#undef mbtowc

+

+int

+mbtowc(wchar_t *restrict pwc, const char *restrict s, size_t n)

+{

+	const char *t = s;

+	unsigned long wc;

+	unsigned c;

+	size_t len;

+

+	if (s == NULL)

+		return 0;

+

+	wc = c = *t++;

+	for (len = 0; n > 0 && c & 0x80; --n, ++len)

+		c <<= 1;

+	if (n == 0 || len == 1 || len == 8)

+		return -1;

+	if (len == 0)

+		goto return_code;

+

+	for (wc = (c & 0xFF) >> len; len--; wc |= c & 0x3F) {

+		if ((c = *t++) & 0xC0 != 0x80)

+			return -1;

+		wc <<= 6;

+	}

+

+return_code:

+	if (pwc)

+		*pwc = wc;

+	return (*s) ? t - s : 0;

+}