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-rw-r--r--src/stdio/vfscanf.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/stdio/vfscanf.c b/src/stdio/vfscanf.c
new file mode 100644
index 00000000..69f45081
--- /dev/null
+++ b/src/stdio/vfscanf.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "stdio_impl.h"
+#include "__scanf.h"
+
+static void f_read(rctx_t *r)
+{
+ FILE *f = r->opaque;
+ if ((r->c = __uflow(f)) >= 0) r->l++;
+}
+
+int vfscanf(FILE *f, const char *fmt, va_list ap)
+{
+ size_t l = strlen(fmt), i, result;
+ rctx_t r = { f_read, (void *)f, 0, isspace };
+ wchar_t fmt2[l+1];
+
+ if (l > 0x100000) {
+ errno = ENOMEM;
+ return -1;
+ }
+ for (i=0; i<=l; i++) fmt2[i] = (unsigned char)fmt[i];
+
+ FLOCK(f);
+
+ result = __scanf(&r, fmt2, ap);
+
+ if (r.u && r.c >= 0) {
+ /* This code takes care of the case where the caller performs
+ * a nonmatching scanf to leave a character in the unscan
+ * buffer, followed by an unget, followed by a scanf that
+ * matches zero characters. In this case the final 'unread'
+ * character must be returned to the unget buffer rather than
+ * the unscan buffer. */
+ f->rpos--;
+ }
+
+ FUNLOCK(f);
+ return result;
+}