1 files changed, 77 insertions, 0 deletions
diff --git a/stdio-common/tst-scanf-format-vs.h b/stdio-common/tst-scanf-format-vs.h
new file mode 100644
index 0000000..d49690d
--- /dev/null
+++ b/stdio-common/tst-scanf-format-vs.h
@@ -0,0 +1,77 @@
+/* Test feature wrapper for formatted 'vsscanf' input.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <support/support.h>
+
+static char *sscanf_buf;
+static size_t sscanf_buf_size;
+
+static void __attribute__ ((destructor))
+scanf_under_test_fini (void)
+{
+  free (sscanf_buf);
+}
+
+static int
+scanf_under_test (const char *restrict fmt, ...)
+{
+  size_t i = 0;
+  va_list ap;
+  int result;
+  int ch;
+
+  do
+    {
+      ch = read_input ();
+      if (ch < 0)
+	{
+	  result = ch;
+	  goto out;
+	}
+      if (i == sscanf_buf_size)
+	{
+	  sscanf_buf_size += SIZE_CHUNK;
+	  /* Add an extra byte for the terminating null character.  */
+	  sscanf_buf = xrealloc (sscanf_buf, sscanf_buf_size + 1);
+	}
+      sscanf_buf[i++] = ch;
+    }
+  while (ch != ':');
+  sscanf_buf[i++] = '\0';
+
+  ch = ungetc (ch, stdin);
+  if (ch == EOF)
+    {
+      result = INPUT_ERROR;
+      goto out;
+    }
+
+  va_start (ap, fmt);
+  result = vsscanf (sscanf_buf, fmt, ap);
+  va_end (ap);
+  if (result == EOF)
+    result = INPUT_EOF;
+
+out:
+  return result;
+}