X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-fseek.c;h=6ba3788294a33a9a754b1dd949b6d7afab16f060;hb=b06da86eb05ed57e2861061ae5cacf4c7a3686f1;hp=c2d783f6bead4fb1578dede0d99323b184e111b3;hpb=57fdfd3f8ec62b105c53bcdf6f127c35c7fe7391;p=gnulib.git

diff --git a/tests/test-fseek.c b/tests/test-fseek.c
index c2d783f6b..6ba378829 100644
--- a/tests/test-fseek.c
+++ b/tests/test-fseek.c
@@ -1,5 +1,5 @@
 /* Test of fseek() function.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2008, 2009 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
@@ -19,11 +19,57 @@
 #include <config.h>
 
 #include <stdio.h>
+#include <stdlib.h>
+
+#define ASSERT(expr) \
+  do									     \
+    {									     \
+      if (!(expr))							     \
+        {								     \
+          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          fflush (stderr);						     \
+          abort ();							     \
+        }								     \
+    }									     \
+  while (0)
+
+#ifndef FUNC_UNGETC_BROKEN
+# define FUNC_UNGETC_BROKEN 0
+#endif
 
 int
 main (int argc, char **argv)
 {
-  /* Assume stdin is seekable iff argc > 1.  */
+  /* Assume stdin is non-empty, seekable, and starts with '#!/bin/sh'
+     iff argc > 1.  */
   int expected = argc > 1 ? 0 : -1;
-  return fseek (stdin, 0, SEEK_CUR) != expected;
+  ASSERT (fseek (stdin, 0, SEEK_CUR) == expected);
+  if (argc > 1)
+    {
+      /* Test that fseek discards previously read ungetc data.  */
+      int ch = fgetc (stdin);
+      ASSERT (ch == '#');
+      ASSERT (ungetc (ch, stdin) == ch);
+      ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
+      ch = fgetc (stdin);
+      ASSERT (ch == '/');
+      if (2 < argc)
+        {
+          if (FUNC_UNGETC_BROKEN)
+            {
+              fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
+                     stderr);
+              return 77;
+            }
+          /* Test that fseek discards random ungetc data.  */
+          ASSERT (ungetc (ch ^ 0xff, stdin) == (ch ^ 0xff));
+        }
+      ASSERT (fseek (stdin, 0, SEEK_END) == 0);
+      ASSERT (fgetc (stdin) == EOF);
+      /* Test that fseek resets end-of-file marker.  */
+      ASSERT (feof (stdin));
+      ASSERT (fseek (stdin, 0, SEEK_END) == 0);
+      ASSERT (!feof (stdin));
+    }
+  return 0;
 }