1 files changed, 100 insertions, 0 deletions
diff --git a/gnulib-tests/test-freadptr.c b/gnulib-tests/test-freadptr.c
new file mode 100644
index 0000000..3d8f29e
--- /dev/null
+++ b/gnulib-tests/test-freadptr.c
@@ -0,0 +1,100 @@
+/* Test of freadptr() function.
+   Copyright (C) 2007-2022 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2008.  */
+
+#include <config.h>
+
+#include "freadptr.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "macros.h"
+
+int
+main (int argc, char **argv)
+{
+  int nbytes = atoi (argv[1]);
+  {
+    void *buf = malloc (nbytes);
+    ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
+    free (buf);
+  }
+
+  if (lseek (0, 0, SEEK_CUR) == nbytes)
+    {
+      /* An unbuffered stdio, such as BeOS or on uClibc compiled without
+         __STDIO_BUFFERS.  Or stdin is a pipe.  */
+      size_t size;
+      ASSERT (freadptr (stdin, &size) == NULL);
+    }
+  else
+    {
+      /* Normal buffered stdio.  */
+      const char stdin_contents[] =
+        "#!/bin/sh\n\n${CHECKER} ./test-freadptr${EXEEXT} 5 < \"$srcdir/test-freadptr.sh\" || exit 1\ncat \"$srcdir/test-freadptr.sh\" | ${CHECKER} ./test-freadptr${EXEEXT} 5 || exit 1\nexit 0\n";
+      const char *expected = stdin_contents + nbytes;
+      size_t available1;
+      size_t available2;
+      size_t available3;
+
+      /* Test normal behaviour.  */
+      {
+        const char *ptr = freadptr (stdin, &available1);
+
+        ASSERT (ptr != NULL);
+        ASSERT (available1 != 0);
+        ASSERT (available1 <= strlen (expected));
+        ASSERT (memcmp (ptr, expected, available1) == 0);
+      }
+
+      /* Test behaviour after normal ungetc.  */
+      ungetc (fgetc (stdin), stdin);
+      {
+        const char *ptr = freadptr (stdin, &available2);
+
+        if (ptr != NULL)
+          {
+            ASSERT (available2 == available1);
+            ASSERT (memcmp (ptr, expected, available2) == 0);
+          }
+      }
+
+      /* Test behaviour after arbitrary ungetc.  */
+      fgetc (stdin);
+      ungetc ('@', stdin);
+      {
+        const char *ptr = freadptr (stdin, &available3);
+
+        if (ptr != NULL)
+          {
+            ASSERT (available3 == 1 || available3 == available1);
+            ASSERT (ptr[0] == '@');
+            if (available3 > 1)
+              {
+                ASSERT (memcmp (ptr + 1, expected + 1, available3 - 1) == 0);
+              }
+          }
+      }
+    }
+
+  /* Free memory allocated during ungetc().  */
+  fclose (stdin);
+
+  return 0;
+}