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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.
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Siddhesh Poyarekar
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Sep 28, 2012
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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); | ||
|
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|
|
||
| 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; | ||
|
|
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| if (fputws (L"ゅう\n", fp) == -1) | ||
| { | ||
| printf ("seek_set: fputws(1): %s\n", strerror (errno)); | ||
| return 1; | ||
| } | ||
|
|
||
| save1 = ftell (fp); | ||
|
|
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| if (fputws (L"ゅう\n", fp) == -1) | ||
| { | ||
| printf ("seek_set: fputws(2): %s\n", strerror (errno)); | ||
| return 1; | ||
| } | ||
|
|
||
| save2 = ftell (fp); | ||
|
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| if (fputws (L"ゅう\n", fp) == -1) | ||
| { | ||
| printf ("seek_set: fputws(3): %s\n", strerror (errno)); | ||
| return 1; | ||
| } | ||
|
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||
| 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; | ||
| } | ||
|
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||
| return 0; | ||
| } | ||
|
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||
| 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); | ||
| } | ||
|
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| int ret = 0; | ||
| char *filename; | ||
| int fd = create_temp_file ("tst-fseek.out", &filename); | ||
|
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| if (fd == -1) | ||
| return 1; | ||
|
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| FILE *fp = fdopen (fd, "w+"); | ||
| if (fp == NULL) | ||
| { | ||
| printf ("seek_set: fopen: %s\n", strerror (errno)); | ||
| close (fd); | ||
| return 1; | ||
| } | ||
|
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| if (do_seek_set (fp)) | ||
| { | ||
| printf ("SEEK_SET test failed\n"); | ||
| ret = 1; | ||
| } | ||
|
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| /* Reopen the file. */ | ||
| fclose (fp); | ||
| fp = fopen (filename, "w+"); | ||
| if (fp == NULL) | ||
| { | ||
| printf ("seek_end: fopen: %s\n", strerror (errno)); | ||
| return 1; | ||
| } | ||
|
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| if (do_seek_end (fp)) | ||
| { | ||
| printf ("SEEK_END test failed\n"); | ||
| ret = 1; | ||
| } | ||
|
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| fclose (fp); | ||
|
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| return ret; | ||
| } | ||
|
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| #define TEST_FUNCTION do_test () | ||
| #include "../test-skeleton.c" |
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