1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2019 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
36 #define _GNU_SOURCE
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40
41 static const char file_name[] = "posix-io-test-file";
42 static const char test_string[] = "hello, world\n";
43
test_cleanup(void)44 static void test_cleanup(void)
45 {
46 remove(file_name);
47 }
48
49 static int
test_cmp(FILE * f,const char * t)50 test_cmp(FILE *f, const char *t)
51 {
52 int c;
53 while ((c = getc(f)) != EOF) {
54 if ((char) c != *t) {
55 printf("read incorrect byte %c != %c\n", c, *t);
56 return 1;
57 }
58 t++;
59 }
60 return 0;
61 }
62 int
main(void)63 main(void)
64 {
65 FILE *f;
66
67 atexit(test_cleanup);
68 f = fopen(file_name, "w+");
69 if (!f) {
70 printf("failed to open \"%s\" for writing\n", file_name);
71 return 1;
72 }
73
74 if ((size_t) fprintf(f, "%s", test_string) != strlen(test_string)) {
75 printf("failed to fprintf test string %s\n", test_string);
76 return 1;
77 }
78
79 #if defined(TINY_STDIO) || !defined(_HAVE_SEMIHOST)
80 if (fseeko(f, -3, SEEK_CUR) < 0) {
81 printf("failed to seek back 3 bytes\n");
82 return 1;
83 }
84 if (test_cmp(f, test_string + sizeof(test_string) - 4))
85 return 1;
86
87 if (fseek(f, 2, SEEK_SET)) {
88 printf("failed to seek to 2 bytes\n");
89 return 1;
90 }
91 if (test_cmp(f, test_string + 2))
92 return 1;
93 #endif
94
95 if (fclose(f) != 0) {
96 printf("fclose failed\n");
97 return 1;
98 }
99
100 f = fopen(file_name, "r");
101 if (!f) {
102 printf("failed to open \"%s\" for reading\n", file_name);
103 return 1;
104 }
105
106 if (test_cmp(f, test_string))
107 return 1;
108
109 printf("success\n");
110 exit(0);
111 }
112
