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authorSiddhesh Poyarekar <siddhesh@redhat.com>2012-09-28 18:20:40 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2012-09-28 18:21:39 +0530
commit4573c6b09884a93fffa3a754678ef881cadebfb3 (patch)
tree89734fdb5480204f4bf4ad5c0977c39a5265ec2f /libio/tst-fseek.c
parent784421e72b926d027398ee93c6c2f1ddad549c6a (diff)
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Adjust wide data buffer pointers during fseek and ftell
[BZ #14543] Set the internal buffer state correctly whenever the external buffer state is modified by fseek by either computing the current _IO_read_ptr/end for the internal buffer based on the new _IO_read_ptr in the external buffer or converting the content read into the external buffer, up to the extent of the requested fseek offset.
Diffstat (limited to 'libio/tst-fseek.c')
-rw-r--r--libio/tst-fseek.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/libio/tst-fseek.c b/libio/tst-fseek.c
new file mode 100644
index 0000000..457a087
--- /dev/null
+++ b/libio/tst-fseek.c
@@ -0,0 +1,173 @@
+/* Verify that fseek/ftell combination works for wide chars.
+ Copyright (C) 2012 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 <stdio.h>
+#include <stdlib.h>
+#include <locale.h>
+#include <errno.h>
+#include <wchar.h>
+#include <unistd.h>
+#include <string.h>
+
+/* Defined in test-skeleton.c. */
+static int create_temp_file (const char *base, char **filename);
+
+
+static int
+do_seek_end (FILE *fp)
+{
+ long save;
+
+ if (fputws (L"abc\n", fp) == -1)
+ {
+ printf ("do_seek_end: fputws: %s\n", strerror (errno));
+ return 1;
+ }
+
+ save = ftell (fp);
+ rewind (fp);
+
+ if (fseek (fp, 0, SEEK_END) == -1)
+ {
+ printf ("do_seek_end: fseek: %s\n", strerror (errno));
+ return 1;
+ }
+
+ if (save != ftell (fp))
+ {
+ printf ("save = %ld, ftell = %ld\n", save, ftell (fp));
+ return 1;
+ }
+
+ return 0;
+}
+
+int
+do_seek_set (FILE *fp)
+{
+ long save1, save2;
+
+ if (fputws (L"ゅう\n", fp) == -1)
+ {
+ printf ("seek_set: fputws(1): %s\n", strerror (errno));
+ return 1;
+ }
+
+ save1 = ftell (fp);
+
+ if (fputws (L"ゅう\n", fp) == -1)
+ {
+ printf ("seek_set: fputws(2): %s\n", strerror (errno));
+ return 1;
+ }
+
+ save2 = ftell (fp);
+
+ if (fputws (L"ゅう\n", fp) == -1)
+ {
+ printf ("seek_set: fputws(3): %s\n", strerror (errno));
+ return 1;
+ }
+
+ if (fseek (fp, save1, SEEK_SET) == -1)
+ {
+ printf ("seek_set: fseek(1): %s\n", strerror (errno));
+ return 1;
+ }
+
+ if (save1 != ftell (fp))
+ {
+ printf ("save1 = %ld, ftell = %ld\n", save1, ftell (fp));
+ return 1;
+ }
+
+ if (fseek (fp, save2, SEEK_SET) == -1)
+ {
+ printf ("seek_set: fseek(2): %s\n", strerror (errno));
+ return 1;
+ }
+
+ if (save2 != ftell (fp))
+ {
+ printf ("save2 = %ld, ftell = %ld\n", save2, ftell (fp));
+ return 1;
+ }
+
+ return 0;
+}
+
+static int
+do_test (void)
+{
+ if (setlocale (LC_ALL, "ja_JP.UTF-8") == NULL)
+ {
+ printf ("Cannot set ja_JP.UTF-8 locale.\n");
+ exit (1);
+ }
+
+ /* Retain messages in English. */
+ if (setlocale (LC_MESSAGES, "en_US.ISO-8859-1") == NULL)
+ {
+ printf ("Cannot set LC_MESSAGES to en_US.ISO-8859-1 locale.\n");
+ exit (1);
+ }
+
+ int ret = 0;
+ char *filename;
+ int fd = create_temp_file ("tst-fseek.out", &filename);
+
+ if (fd == -1)
+ return 1;
+
+ FILE *fp = fdopen (fd, "w+");
+ if (fp == NULL)
+ {
+ printf ("seek_set: fopen: %s\n", strerror (errno));
+ close (fd);
+ return 1;
+ }
+
+ if (do_seek_set (fp))
+ {
+ printf ("SEEK_SET test failed\n");
+ ret = 1;
+ }
+
+ /* Reopen the file. */
+ fclose (fp);
+ fp = fopen (filename, "w+");
+ if (fp == NULL)
+ {
+ printf ("seek_end: fopen: %s\n", strerror (errno));
+ return 1;
+ }
+
+ if (do_seek_end (fp))
+ {
+ printf ("SEEK_END test failed\n");
+ ret = 1;
+ }
+
+ fclose (fp);
+
+ return ret;
+}
+
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"