1 files changed, 128 insertions, 0 deletions
diff --git a/REORG.TODO/stdio-common/test_rdwr.c b/REORG.TODO/stdio-common/test_rdwr.c
new file mode 100644
index 0000000000..c7e0c4da06
--- /dev/null
+++ b/REORG.TODO/stdio-common/test_rdwr.c
@@ -0,0 +1,128 @@
+/* Copyright (C) 1991-2017 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+int
+main (int argc, char **argv)
+{
+  static const char hello[] = "Hello, world.\n";
+  static const char replace[] = "Hewwo, world.\n";
+  static const size_t replace_from = 2, replace_to = 4;
+  char filename[FILENAME_MAX];
+  char *name = strrchr (*argv, '/');
+  char buf[BUFSIZ];
+  FILE *f;
+  int lose = 0;
+
+  if (name != NULL)
+    ++name;
+  else
+    name = *argv;
+
+  (void) sprintf (filename, "/tmp/%s.test", name);
+
+  f = fopen (filename, "w+");
+  if (f == NULL)
+    {
+      perror (filename);
+      exit (1);
+    }
+
+  (void) fputs (hello, f);
+  rewind (f);
+  (void) fgets (buf, sizeof (buf), f);
+  rewind (f);
+  (void) fputs (buf, f);
+  rewind (f);
+  {
+    size_t i;
+    for (i = 0; i < replace_from; ++i)
+      {
+	int c = getc (f);
+	if (c == EOF)
+	  {
+	    printf ("EOF at %Zu.\n", i);
+	    lose = 1;
+	    break;
+	  }
+	else if (c != hello[i])
+	  {
+	    printf ("Got '%c' instead of '%c' at %Zu.\n",
+		    (unsigned char) c, hello[i], i);
+	    lose = 1;
+	    break;
+	  }
+      }
+  }
+
+  {
+    long int where = ftell (f);
+    if (where == (long int) replace_from)
+      {
+	size_t i;
+	for (i = replace_from; i < replace_to; ++i)
+	  if (putc(replace[i], f) == EOF)
+	    {
+	      printf ("putc('%c') got %s at %Zu.\n",
+		      replace[i], strerror (errno), i);
+	      lose = 1;
+	      break;
+	    }
+      }
+    else if (where == -1L)
+      {
+	printf ("ftell got %s (should be at %Zu).\n",
+		strerror (errno), replace_from);
+	lose = 1;
+      }
+    else
+      {
+	printf ("ftell returns %lu; should be %Zu.\n", where, replace_from);
+	lose = 1;
+      }
+  }
+
+  if (!lose)
+    {
+      rewind (f);
+      if (fgets (buf, sizeof (buf), f) == NULL)
+	{
+	  printf ("fgets got %s.\n", strerror(errno));
+	  lose = 1;
+	}
+      else if (strcmp (buf, replace))
+	{
+	  printf ("Read \"%s\" instead of \"%s\".\n", buf, replace);
+	  lose = 1;
+	}
+    }
+
+  if (lose)
+    printf ("Test FAILED!  Losing file is \"%s\".\n", filename);
+  else
+    {
+      (void) remove (filename);
+      puts ("Test succeeded.");
+    }
+
+  return lose ? EXIT_FAILURE : EXIT_SUCCESS;
+}