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-rw-r--r--src/stdio/fgetwc.c51
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);