Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 144 insertions, 0 deletions

diff --git a/REORG.TODO/stdio-common/tst-rndseek.c b/REORG.TODO/stdio-common/tst-rndseek.c
new file mode 100644
index 0000000000..cf53aa48e0
--- /dev/null
+++ b/REORG.TODO/stdio-common/tst-rndseek.c
@@ -0,0 +1,144 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+static char fname[] = "/tmp/rndseek.XXXXXX";
+static char tempdata[65 * 1024];
+
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#define TIMEOUT 10
+
+#include "../test-skeleton.c"
+
+
+static int
+fp_test (const char *name, FILE *fp)
+{
+  int result = 0;
+  int rounds = 10000;
+
+  do
+    {
+      int idx = random () % (sizeof (tempdata) - 2);
+      char ch1;
+      char ch2;
+
+      if (fseek (fp, idx, SEEK_SET) != 0)
+	{
+	  printf ("%s: %d: fseek failed: %m\n", name, rounds);
+	  result = 1;
+	  break;
+	}
+
+      ch1 = fgetc_unlocked (fp);
+      ch2 = tempdata[idx];
+      if (ch1 != ch2)
+	{
+	  printf ("%s: %d: character at index %d not what is expected ('%c' vs '%c')\n",
+		  name, rounds, idx, ch1, ch2);
+	  result = 1;
+	  break;
+	}
+
+      ch1 = fgetc (fp);
+      ch2 = tempdata[idx + 1];
+      if (ch1 != ch2)
+	{
+	  printf ("%s: %d: character at index %d not what is expected ('%c' vs '%c')\n",
+		  name, rounds, idx + 1, ch1, ch2);
+	  result = 1;
+	  break;
+	}
+    }
+  while (--rounds > 0);
+
+  fclose (fp);
+
+  return result;
+}
+
+
+static int
+do_test (void)
+{
+  int fd;
+  FILE *fp;
+  size_t i;
+  int result;
+
+  fd = mkstemp (fname);
+  if (fd == -1)
+    {
+      printf ("cannot open temporary file: %m\n");
+      return 1;
+    }
+  /* Make sure the file gets removed.  */
+  add_temp_file (fname);
+
+  /* Repeatability demands this.  */
+  srandom (42);
+
+  /* First create some temporary data.  */
+  for (i = 0; i < sizeof (tempdata); ++i)
+    tempdata[i] = 'a' + random () % 26;
+
+  /* Write this data to a file.  */
+  if (TEMP_FAILURE_RETRY (write (fd, tempdata, sizeof (tempdata)))
+      != sizeof (tempdata))
+    {
+      printf ("cannot wrote data to temporary file: %m\n");
+      return 1;
+    }
+
+  /* Now try reading the data.  */
+  fp = fdopen (dup (fd), "r");
+  if (fp == NULL)
+    {
+      printf ("cannot duplicate temporary file descriptor: %m\n");
+      return 1;
+    }
+
+  rewind (fp);
+  for (i = 0; i < sizeof (tempdata); ++i)
+    {
+      int ch0 = fgetc (fp);
+      char ch1 = ch0;
+      char ch2 = tempdata[i];
+
+      if (ch0 == EOF)
+	{
+	  puts ("premature end of file while reading data");
+	  return 1;
+	}
+
+      if (ch1 != ch2)
+	{
+	  printf ("%zd: '%c' vs '%c'\n", i, ch1, ch2);
+	  return 1;
+	}
+    }
+
+  result = fp_test ("fdopen(\"r\")", fp);
+
+  fp = fopen (fname, "r");
+  result |= fp_test ("fopen(\"r\")", fp);
+
+  fp = fopen64 (fname, "r");
+  result |= fp_test ("fopen64(\"r\")", fp);
+
+  /* The "rw" mode will prevent the mmap-using code from being used.  */
+  fp = fdopen (fd, "rw");
+  result = fp_test ("fdopen(\"rw\")", fp);
+
+  fp = fopen (fname, "rw");
+  result |= fp_test ("fopen(\"rw\")", fp);
+
+  fp = fopen64 (fname, "rw");
+  result |= fp_test ("fopen64(\"rw\")", fp);
+
+  return result;
+}