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026a84a54d
Using write without cheks leads to warn unused result when __wur is enabled. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
/* Test program for ungetc/fseekpos interaction.
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Copyright (C) 2004-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <support/xunistd.h>
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static void do_prepare (void);
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#define PREPARE(argc, argv) do_prepare ()
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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static const char pattern[] = "abcdefghijklmnopqrstuvwxyz";
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static char *temp_file;
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static void
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do_prepare (void)
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{
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int fd = create_temp_file ("bug-ungetc.", &temp_file);
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if (fd == -1)
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{
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printf ("cannot create temporary file: %m\n");
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exit (1);
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}
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xwrite (fd, pattern, sizeof (pattern) - 1);
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close (fd);
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}
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#define TEST_POS 5
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static int
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do_one_test (int mode)
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{
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FILE *f = fopen (temp_file, "r");
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if (f == NULL)
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{
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printf ("%d: could not open temporary file: %m\n", mode);
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return 1;
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}
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int i;
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for (i = 0; i < TEST_POS; ++i)
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getc (f);
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fpos_t p;
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if (fgetpos (f, &p) != 0)
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{
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printf ("%d: fgetpos failed: %m\n", mode);
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return 1;
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}
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if (mode)
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{
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if (fseek (f, 0, SEEK_SET) != 0)
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{
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printf ("%d: fseek failed: %m\n", mode);
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return 1;
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}
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for (i = 0; i < TEST_POS - (mode >= 2); ++i)
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getc (f);
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}
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if (mode != 2 && ungetc ('X', f) != 'X')
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{
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printf ("%d: ungetc failed\n", mode);
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return 1;
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}
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if (mode == 3 && getc (f) != 'X')
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{
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printf ("%d: getc after ungetc did not return X\n", mode);
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return 1;
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}
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if (fsetpos (f, &p) != 0)
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{
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printf ("%d: fsetpos failed: %m\n", mode);
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return 1;
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}
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if (getc (f) != pattern[TEST_POS])
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{
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printf ("%d: getc did not return %c\n", mode, pattern[TEST_POS]);
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return 1;
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}
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fclose (f);
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return 0;
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}
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static int
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do_test (void)
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{
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int mode, ret = 0;
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for (mode = 0; mode <= 4; mode++)
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ret |= do_one_test (mode);
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return ret;
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}
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