1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2022 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 #define _DEFAULT_SOURCE
36 #include <stdio.h>
37 #include <stdlib.h>
38
39 #ifndef TEST_FILE_NAME
40 #define TEST_FILE_NAME "FOPEN.TXT"
41 #endif
42
43 #define check(condition, message) do { \
44 if (!(condition)) { \
45 printf("%s: %s\n", message, #condition); \
46 if (f) \
47 fclose(f); \
48 (void) remove(TEST_FILE_NAME); \
49 exit(1); \
50 } \
51 } while(0)
52
53 #define MESSAGE "hello, world\n"
54
55 void
check_contents(int repeats)56 check_contents(int repeats)
57 {
58 FILE *f;
59 char *s;
60 int r;
61 int c;
62
63 f = fopen(TEST_FILE_NAME, "r");
64 check(f != NULL, "fopen r");
65 for (r = 0; r < repeats; r++) {
66 for (s = MESSAGE; *s; s++) {
67 c = getc(f);
68 check((char) c == *s, "contents");
69 }
70 }
71 c = getc(f);
72 check(c == EOF, "EOF");
73 r = fclose(f);
74 f = NULL;
75 check(r == 0, "fclose r");
76 }
77
78 int
main(void)79 main(void)
80 {
81 FILE *f;
82
83 /* Make sure we can create a file, write contents and read them back */
84 f = fopen(TEST_FILE_NAME, "w");
85 check(f != NULL, "fopen w");
86 fputs(MESSAGE, f);
87 fclose(f);
88 check_contents(1);
89
90 /* Make sure we can append contents to a file and read them back */
91 f = fopen(TEST_FILE_NAME, "a");
92 check(f != NULL, "fopen a");
93 fputs(MESSAGE, f);
94 fclose(f);
95 check_contents(2);
96
97 /* Make sure we can truncate the file */
98 f = fopen(TEST_FILE_NAME, "w");
99 check(f != NULL, "fopen w 2");
100 fclose(f);
101 check_contents(0);
102
103 (void) remove(TEST_FILE_NAME);
104
105 exit(0);
106 }
107
