1 /* Test of getcwd function.
2 Copyright (C) 2000-2023 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 <errno.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24 #include <sys/param.h>
25 #include <libc-diag.h>
26
27
28 #define TEST_FUNCTION do_test ()
29 static int
30 do_test (void)
31 {
32 char thepath[4096]; /* Yes, this limits the environment this test
33 can run it but I honestly don't care about
34 people which have this problem. */
35 char *bufs[10];
36 size_t lens[10];
37 size_t sbs;
38 size_t len, i;
39
40 if (getcwd (thepath, sizeof thepath) == NULL)
41 {
42 if (errno == ERANGE)
43 /* The path is too long, skip all tests. */
44 return 0;
45
46 puts ("getcwd (thepath, sizeof thepath) failed");
47 return 1;
48 }
49 len = strlen (thepath);
50
51 sbs = 1;
52 while (sbs < len + 1)
53 sbs <<= 1;
54
55 for (i = 0; i < 4; ++i)
56 {
57 lens[i] = sbs;
58 bufs[i] = (char *) malloc (sbs);
59 }
60
61 /* Avoid warnings about the first argument being null when the second
62 is nonzero. */
63 DIAG_PUSH_NEEDS_COMMENT;
64 DIAG_IGNORE_NEEDS_COMMENT (10.1, "-Wnonnull");
65 bufs[i] = getcwd (NULL, sbs);
66 DIAG_POP_NEEDS_COMMENT;
67
68 lens[i] = sbs;
69 if (bufs[i] == NULL)
70 {
71 puts ("getcwd (NULL, sbs) failed");
72 return 1;
73 }
74 ++i;
75
76 for (; i < 10; sbs >>= 1, ++i)
77 {
78 bufs[i] = (char *) malloc (MAX (1, sbs));
79 lens[i] = sbs;
80 }
81
82 /* Before we test the result write something in the memory to see
83 whether the allocation went right. */
84 for (i = 0; i < 10; ++i)
85 if (i != 4 && bufs[i] != NULL)
86 memset (bufs[i], '\xff', lens[i]);
87
88 if (strcmp (thepath, bufs[4]) != 0)
89 {
90 printf ("\
91 getcwd (NULL, sbs) = \"%s\", getcwd (thepath, sizeof thepath) = \"%s\"\n",
92 bufs[4], thepath);
93 return 1;
94 }
95
96 /* Now overwrite all buffers to see that getcwd allocated the buffer
97 of right size. */
98 for (i = 0; i < 10; ++i)
99 memset (bufs[i], i, lens[i]);
100
101 for (i = 0; i < 10; ++i)
102 free (bufs[i]);
103
104 /* Test whether the function signals success despite the buffer
105 being too small.
106 Avoid warnings about the first argument being null when the second
107 is nonzero. */
108 DIAG_PUSH_NEEDS_COMMENT;
109 DIAG_IGNORE_NEEDS_COMMENT (10.1, "-Wnonnull");
110 if (getcwd (NULL, len) != NULL)
111 {
112 puts ("getcwd (NULL, len) didn't failed");
113 return 1;
114 }
115 DIAG_POP_NEEDS_COMMENT;
116
117 bufs[0] = malloc (len);
118 bufs[1] = malloc (len);
119 bufs[2] = malloc (len);
120 if (bufs[1] != NULL)
121 {
122 if (getcwd (bufs[1], len) != NULL)
123 {
124 puts ("getcwd (bufs[1], len) didn't failed");
125 return 1;
126 }
127 free (bufs[0]);
128 free (bufs[1]);
129 free (bufs[2]);
130 }
131
132 memset (thepath, '\xfe', sizeof (thepath));
133 if (getcwd (thepath, len) != NULL)
134 {
135 puts ("getcwd (thepath, len) didn't failed");
136 return 1;
137 }
138
139 for (i = len; i < sizeof thepath; ++i)
140 if (thepath[i] != '\xfe')
141 {
142 puts ("thepath[i] != '\xfe'");
143 return 1;
144 }
145
146 /* Now test handling of correctly sized buffers.
147 Again. avoid warnings about the first argument being null when
148 the second is nonzero. */
149 DIAG_PUSH_NEEDS_COMMENT;
150 DIAG_IGNORE_NEEDS_COMMENT (10.1, "-Wnonnull");
151 bufs[0] = getcwd (NULL, len + 1);
152 if (bufs[0] == NULL)
153 {
154 puts ("getcwd (NULL, len + 1) failed");
155 return 1;
156 }
157 DIAG_POP_NEEDS_COMMENT;
158 free (bufs[0]);
159
160 memset (thepath, '\xff', sizeof thepath);
161 if (getcwd (thepath, len + 1) == NULL)
162 {
163 puts ("getcwd (thepath, len + 1) failed");
164 return 1;
165 }
166
167 for (i = len + 1; i < sizeof thepath; ++i)
168 if (thepath[i] != '\xff')
169 {
170 printf ("thepath[%zd] != '\xff'\n", i);
171 return 1;
172 }
173
174 puts ("everything OK");
175
176 return 0;
177 }
178
179 #include "../test-skeleton.c"