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 #define TEST_FILE_NAME "FOPEN.TXT"
40
41 #define check(condition, message) do { \
42 if (!(condition)) { \
43 printf("%s: %s\n", message, #condition); \
44 if (f) \
45 fclose(f); \
46 (void) remove(TEST_FILE_NAME); \
47 exit(1); \
48 } \
49 } while(0)
50
51 #define MESSAGE "hello, world\n"
52
53 void
check_contents(int repeats)54 check_contents(int repeats)
55 {
56 FILE *f;
57 char *s;
58 int r;
59 int c;
60
61 f = fopen(TEST_FILE_NAME, "r");
62 check(f != NULL, "fopen r");
63 for (r = 0; r < repeats; r++) {
64 for (s = MESSAGE; *s; s++) {
65 c = getc(f);
66 check((char) c == *s, "contents");
67 }
68 }
69 c = getc(f);
70 check(c == EOF, "EOF");
71 r = fclose(f);
72 f = NULL;
73 check(r == 0, "fclose r");
74 }
75
76 int
main(void)77 main(void)
78 {
79 FILE *f;
80
81 /* Make sure we can create a file, write contents and read them back */
82 f = fopen(TEST_FILE_NAME, "w");
83 check(f != NULL, "fopen w");
84 fputs(MESSAGE, f);
85 fclose(f);
86 check_contents(1);
87
88 /* Make sure we can append contents to a file and read them back */
89 f = fopen(TEST_FILE_NAME, "a");
90 check(f != NULL, "fopen a");
91 fputs(MESSAGE, f);
92 fclose(f);
93 check_contents(2);
94
95 /* Make sure we can truncate the file */
96 f = fopen(TEST_FILE_NAME, "w");
97 check(f != NULL, "fopen w 2");
98 fclose(f);
99 check_contents(0);
100
101 (void) remove(TEST_FILE_NAME);
102
103 exit(0);
104 }
105
