1 | /* Test program for ungetc/fseekpos interaction. |
2 | Copyright (C) 2004-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdio.h> |
20 | |
21 | #include <support/xunistd.h> |
22 | |
23 | static void do_prepare (void); |
24 | #define PREPARE(argc, argv) do_prepare () |
25 | static int do_test (void); |
26 | #define TEST_FUNCTION do_test () |
27 | #include "../test-skeleton.c" |
28 | |
29 | static const char pattern[] = "abcdefghijklmnopqrstuvwxyz" ; |
30 | static char *temp_file; |
31 | |
32 | static void |
33 | do_prepare (void) |
34 | { |
35 | int fd = create_temp_file (base: "bug-ungetc." , filename: &temp_file); |
36 | if (fd == -1) |
37 | { |
38 | printf (format: "cannot create temporary file: %m\n" ); |
39 | exit (1); |
40 | } |
41 | xwrite (fd, pattern, sizeof (pattern) - 1); |
42 | close (fd: fd); |
43 | } |
44 | |
45 | #define TEST_POS 5 |
46 | |
47 | static int |
48 | do_one_test (int mode) |
49 | { |
50 | FILE *f = fopen (temp_file, "r" ); |
51 | if (f == NULL) |
52 | { |
53 | printf (format: "%d: could not open temporary file: %m\n" , mode); |
54 | return 1; |
55 | } |
56 | |
57 | int i; |
58 | for (i = 0; i < TEST_POS; ++i) |
59 | getc (stream: f); |
60 | |
61 | fpos_t p; |
62 | if (fgetpos (f, &p) != 0) |
63 | { |
64 | printf (format: "%d: fgetpos failed: %m\n" , mode); |
65 | return 1; |
66 | } |
67 | |
68 | if (mode) |
69 | { |
70 | if (fseek (f, 0, SEEK_SET) != 0) |
71 | { |
72 | printf (format: "%d: fseek failed: %m\n" , mode); |
73 | return 1; |
74 | } |
75 | |
76 | for (i = 0; i < TEST_POS - (mode >= 2); ++i) |
77 | getc (stream: f); |
78 | } |
79 | |
80 | if (mode != 2 && ungetc ('X', f) != 'X') |
81 | { |
82 | printf (format: "%d: ungetc failed\n" , mode); |
83 | return 1; |
84 | } |
85 | |
86 | if (mode == 3 && getc (stream: f) != 'X') |
87 | { |
88 | printf (format: "%d: getc after ungetc did not return X\n" , mode); |
89 | return 1; |
90 | } |
91 | |
92 | if (fsetpos (f, &p) != 0) |
93 | { |
94 | printf (format: "%d: fsetpos failed: %m\n" , mode); |
95 | return 1; |
96 | } |
97 | |
98 | if (getc (stream: f) != pattern[TEST_POS]) |
99 | { |
100 | printf (format: "%d: getc did not return %c\n" , mode, pattern[TEST_POS]); |
101 | return 1; |
102 | } |
103 | |
104 | fclose (f); |
105 | |
106 | return 0; |
107 | } |
108 | |
109 | static int |
110 | do_test (void) |
111 | { |
112 | int mode, ret = 0; |
113 | for (mode = 0; mode <= 4; mode++) |
114 | ret |= do_one_test (mode); |
115 | return ret; |
116 | } |
117 | |