Add mbio.h and freadrune()

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/mbio/freadrune.c b/lib/mbio/freadrune.c
new file mode 100644
index 0000000..efa42b3
--- /dev/null
+++ b/lib/mbio/freadrune.c
@@ -0,0 +1,23 @@
+#include <macros.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "mbio.h"
+#include "mbstring.h"
+
+int
+freadrune(rune *ch, u8_io_state *st, FILE *stream)
+{
+	size_t n, need;
+	need = lengthof(st->_buf) - st->_fill;
+	st->_fill += n = fread(st->_buf + st->_fill, 1, need, stream);
+	if (n < need && ferror(stream))
+		return -1;
+	if (st->_fill == 0)
+		return 0;
+
+	int w = u8tor(ch, st->_buf);
+	memmove(st->_buf, st->_buf + w, lengthof(st->_buf) - w);
+	st->_fill -= w;
+	return w;
+}