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author | Siddhesh Poyarekar <siddhesh@redhat.com> | 2012-09-28 18:20:40 +0530 |
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committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2012-09-28 18:21:39 +0530 |
commit | 4573c6b09884a93fffa3a754678ef881cadebfb3 (patch) | |
tree | 89734fdb5480204f4bf4ad5c0977c39a5265ec2f /libio/tst-fseek.c | |
parent | 784421e72b926d027398ee93c6c2f1ddad549c6a (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.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/libio/tst-fseek.c b/libio/tst-fseek.c new file mode 100644 index 0000000000..457a087785 --- /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" |