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-rw-r--r--lib/mbio/freadrune.c23
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;
+}