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e9a37a83 | 1 | /* Test program for ungetc/fseekpos interaction. |
581c785b | 2 | Copyright (C) 2004-2022 Free Software Foundation, Inc. |
e9a37a83 | 3 | This file is part of the GNU C Library. |
e9a37a83 UD |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
e9a37a83 UD |
18 | |
19 | #include <stdio.h> | |
20 | ||
21 | static void do_prepare (void); | |
22 | #define PREPARE(argc, argv) do_prepare () | |
23 | static int do_test (void); | |
24 | #define TEST_FUNCTION do_test () | |
25 | #include "../test-skeleton.c" | |
26 | ||
27 | static const char pattern[] = "abcdefghijklmnopqrstuvwxyz"; | |
28 | static char *temp_file; | |
29 | ||
30 | static void | |
31 | do_prepare (void) | |
32 | { | |
33 | int fd = create_temp_file ("bug-ungetc.", &temp_file); | |
34 | if (fd == -1) | |
35 | { | |
36 | printf ("cannot create temporary file: %m\n"); | |
37 | exit (1); | |
38 | } | |
39 | write (fd, pattern, sizeof (pattern) - 1); | |
40 | close (fd); | |
41 | } | |
42 | ||
43 | #define TEST_POS 5 | |
44 | ||
45 | static int | |
46 | do_one_test (int mode) | |
47 | { | |
48 | FILE *f = fopen (temp_file, "r"); | |
49 | if (f == NULL) | |
50 | { | |
51 | printf ("%d: could not open temporary file: %m\n", mode); | |
52 | return 1; | |
53 | } | |
54 | ||
55 | int i; | |
56 | for (i = 0; i < TEST_POS; ++i) | |
57 | getc (f); | |
58 | ||
59 | fpos_t p; | |
60 | if (fgetpos (f, &p) != 0) | |
61 | { | |
62 | printf ("%d: fgetpos failed: %m\n", mode); | |
63 | return 1; | |
64 | } | |
65 | ||
66 | if (mode) | |
67 | { | |
68 | if (fseek (f, 0, SEEK_SET) != 0) | |
69 | { | |
70 | printf ("%d: fseek failed: %m\n", mode); | |
71 | return 1; | |
72 | } | |
73 | ||
74 | for (i = 0; i < TEST_POS - (mode >= 2); ++i) | |
75 | getc (f); | |
76 | } | |
77 | ||
78 | if (mode != 2 && ungetc ('X', f) != 'X') | |
79 | { | |
80 | printf ("%d: ungetc failed\n", mode); | |
81 | return 1; | |
82 | } | |
83 | ||
84 | if (mode == 3 && getc (f) != 'X') | |
85 | { | |
86 | printf ("%d: getc after ungetc did not return X\n", mode); | |
87 | return 1; | |
88 | } | |
89 | ||
90 | if (fsetpos (f, &p) != 0) | |
91 | { | |
92 | printf ("%d: fsetpos failed: %m\n", mode); | |
93 | return 1; | |
94 | } | |
95 | ||
96 | if (getc (f) != pattern[TEST_POS]) | |
97 | { | |
98 | printf ("%d: getc did not return %c\n", mode, pattern[TEST_POS]); | |
99 | return 1; | |
100 | } | |
101 | ||
102 | fclose (f); | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int | |
108 | do_test (void) | |
109 | { | |
110 | int mode, ret = 0; | |
111 | for (mode = 0; mode <= 4; mode++) | |
112 | ret |= do_one_test (mode); | |
113 | return ret; | |
114 | } |