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diff lib/ftello.c @ 8868:90e71310a07f

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Fix fseeko/ftello on cygwin 1.5.24. * doc/functions/fseeko.texi (fseeko): Document the fix. * doc/functions/ftello.texi (ftello): Document the fix. * doc/functions/stdin.texi (stdin): Document the cygwin bug. * doc/functions/stdout.text (stdout): New file. * doc/functions/stderr.text (stderr): New file. * doc/gnulib.texi (Function Substitutes): Use new files. * tests/test-fseeko.c (main): Check for broken fseeko on cygwin prior to 1.7.0. * tests/test-ftello.c (main): Likewise for ftello. * tests/test-fseeko.sh: New file. * tests/test-ftello.sh: New file. * modules/fseeko-tests (Makefile.am): Ensure test-fseeko is run with seekable stdin. * modules/ftello-tests (Makefile.am): Likewise for test-ftello. * m4/fseeko.m4 (gl_FUNC_FSEEKO): Detect the cygwin bug. (gl_REPLACE_FSEEKO): New macro. * m4/ftello.m4 (gl_FUNC_FTELLO, gl_REPLACE_FTELLO): Likewise. * modules/fseeko (Files): Distribute fseeko.c. * modules/ftello (Files): Distribute ftello.c. * lib/fseeko.c (rpl_fseeko) [__CYGWIN__]: Convert stdin to 64-bit mode. * lib/ftello.c (rpl_ftello): New file. * m4/stdio_h.m4 (gl_STDIO_H_DEFAULTS): Allow replacement of fseeko, ftello. (gl_STDIN_LARGE_OFFSET): New macro. * modules/stdio (Makefile.am): Perform the replacement. * lib/stdio_.h (rpl_fseeko, rpl_ftello): Define when needed.
author Eric Blake <ebb9@byu.net>
date Thu, 24 May 2007 03:53:37 +0000
parents
children dfee3b4fd46c
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new file mode 100644
--- /dev/null
+++ b/lib/ftello.c
@@ -0,0 +1,45 @@
+/* An ftello() function that works around platform bugs.
+   Copyright (C) 2007 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 2, 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <stdio.h>
+
+#undef ftello
+#if !HAVE_FTELLO
+# define ftello ftell
+#endif
+
+off_t
+rpl_ftello (FILE *fp)
+{
+#if defined __SL64 && defined __SCLE /* Cygwin */
+  if ((fp->_flags & __SL64) == 0)
+    {
+      /* Cygwin 1.5.0 through 1.5.24 failed to open stdin in 64-bit
+	 mode; but has an ftello that requires 64-bit mode.  */
+      FILE *tmp = fopen ("/dev/null", "r");
+      if (!tmp)
+	return -1;
+      fp->_flags |= __SL64;
+      fp->_seek64 = tmp->_seek64;
+      fclose (tmp);
+    }
+#endif
+  return ftello (fp);
+}