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1/* Test program for ungetc/fseekpos interaction.
2 Copyright (C) 2004-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <stdio.h>
21
22static void do_prepare (void);
23#define PREPARE(argc, argv) do_prepare ()
24static int do_test (void);
25#define TEST_FUNCTION do_test ()
26#include "../test-skeleton.c"
27
28static const char pattern[] = "abcdefghijklmnopqrstuvwxyz";
29static char *temp_file;
30
31static void
32do_prepare (void)
33{
34 int fd = create_temp_file ("bug-ungetc.", &temp_file);
35 if (fd == -1)
36 {
37 printf ("cannot create temporary file: %m\n");
38 exit (1);
39 }
40 write (fd, pattern, sizeof (pattern) - 1);
41 close (fd);
42}
43
44#define TEST_POS 5
45
46static int
47do_one_test (int mode)
48{
49 FILE *f = fopen (temp_file, "r");
50 if (f == NULL)
51 {
52 printf ("%d: could not open temporary file: %m\n", mode);
53 return 1;
54 }
55
56 int i;
57 for (i = 0; i < TEST_POS; ++i)
58 getc (f);
59
60 fpos_t p;
61 if (fgetpos (f, &p) != 0)
62 {
63 printf ("%d: fgetpos failed: %m\n", mode);
64 return 1;
65 }
66
67 if (mode)
68 {
69 if (fseek (f, 0, SEEK_SET) != 0)
70 {
71 printf ("%d: fseek failed: %m\n", mode);
72 return 1;
73 }
74
75 for (i = 0; i < TEST_POS - (mode >= 2); ++i)
76 getc (f);
77 }
78
79 if (mode != 2 && ungetc ('X', f) != 'X')
80 {
81 printf ("%d: ungetc failed\n", mode);
82 return 1;
83 }
84
85 if (mode == 3 && getc (f) != 'X')
86 {
87 printf ("%d: getc after ungetc did not return X\n", mode);
88 return 1;
89 }
90
91 if (fsetpos (f, &p) != 0)
92 {
93 printf ("%d: fsetpos failed: %m\n", mode);
94 return 1;
95 }
96
97 if (getc (f) != pattern[TEST_POS])
98 {
99 printf ("%d: getc did not return %c\n", mode, pattern[TEST_POS]);
100 return 1;
101 }
102
103 fclose (f);
104
105 return 0;
106}
107
108static int
109do_test (void)
110{
111 int mode, ret = 0;
112 for (mode = 0; mode <= 4; mode++)
113 ret |= do_one_test (mode);
114 return ret;
115}
116

Warning: That file was not part of the compilation database. It may have many parsing errors.