1 files changed, 51 insertions, 0 deletions
diff --git a/src/stdio/fgetwc.c b/src/stdio/fgetwc.c
new file mode 100644
index 00000000..c990545f
--- /dev/null
+++ b/src/stdio/fgetwc.c
@@ -0,0 +1,51 @@
+#include "stdio_impl.h"
+
+wint_t __fgetwc_unlocked(FILE *f)
+{
+	mbstate_t st = { 0 };
+	wchar_t wc;
+	int c;
+	unsigned char b;
+	size_t l;
+
+	f->mode |= f->mode+1;
+
+	/* Convert character from buffer if possible */
+	if (f->rpos < f->rend) {
+		l = mbrtowc(&wc, f->rpos, f->rend - f->rpos, &st);
+		if (l+2 >= 2) {
+			f->rpos += l + !l; /* l==0 means 1 byte, null */
+			return wc;
+		}
+		if (l == -1) {
+			f->rpos++;
+			return WEOF;
+		}
+	} else l = -2;
+
+	/* Convert character byte-by-byte from __uflow */
+	while (l == -2) {
+		b = c = __uflow(f);
+		if (c < 0) {
+			if (!mbsinit(&st)) errno = EILSEQ;
+			return WEOF;
+		}
+		l = mbrtowc(&wc, &b, 1, &st);
+		if (l == -1) return WEOF;
+	}
+
+	FUNLOCK(f);
+	return wc;
+}
+
+wint_t fgetwc(FILE *f)
+{
+	wint_t c;
+	FLOCK(f);
+	c = __fgetwc_unlocked(f);
+	FUNLOCK(f);
+	return c;
+}
+
+weak_alias(__fgetwc_unlocked, fgetwc_unlocked);
+weak_alias(__fgetwc_unlocked, getwc_unlocked);