1 /*
2  * Copyright (C) 2012 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <gtest/gtest.h>
18 
19 #include <errno.h>
20 #include <limits.h>
21 #include <unistd.h>
22 
TEST(getcwd,auto_full)23 TEST(getcwd, auto_full) {
24   // If we let the library do all the work, everything's fine.
25   errno = 0;
26   char* cwd = getcwd(NULL, 0);
27   ASSERT_TRUE(cwd != NULL);
28   ASSERT_EQ(0, errno);
29   ASSERT_GE(strlen(cwd), 1U);
30   free(cwd);
31 }
32 
TEST(getcwd,auto_reasonable)33 TEST(getcwd, auto_reasonable) {
34   // If we ask the library to allocate a reasonable buffer, everything's fine.
35   errno = 0;
36   char* cwd = getcwd(NULL, PATH_MAX);
37   ASSERT_TRUE(cwd != NULL);
38   ASSERT_EQ(0, errno);
39   ASSERT_GE(strlen(cwd), 1U);
40   free(cwd);
41 }
42 
TEST(getcwd,auto_too_small)43 TEST(getcwd, auto_too_small) {
44   // If we ask the library to allocate a too-small buffer, ERANGE.
45   errno = 0;
46   char* cwd = getcwd(NULL, 1);
47   ASSERT_TRUE(cwd == NULL);
48   ASSERT_EQ(ERANGE, errno);
49 }
50 
TEST(getcwd,auto_too_large)51 TEST(getcwd, auto_too_large) {
52   // If we ask the library to allocate an unreasonably large buffer, ERANGE.
53   errno = 0;
54   char* cwd = getcwd(NULL, static_cast<size_t>(-1));
55   ASSERT_TRUE(cwd == NULL);
56   ASSERT_EQ(ENOMEM, errno);
57 }
58 
TEST(getcwd,manual_too_small)59 TEST(getcwd, manual_too_small) {
60   // If we allocate a too-small buffer, ERANGE.
61   char tiny_buf[1];
62   errno = 0;
63   char* cwd = getcwd(tiny_buf, sizeof(tiny_buf));
64   ASSERT_TRUE(cwd == NULL);
65   ASSERT_EQ(ERANGE, errno);
66 }
67 
TEST(getcwd,manual_zero)68 TEST(getcwd, manual_zero) {
69   // If we allocate a zero-length buffer, EINVAL.
70   char tiny_buf[1];
71   errno = 0;
72   char* cwd = getcwd(tiny_buf, 0);
73   ASSERT_TRUE(cwd == NULL);
74   ASSERT_EQ(EINVAL, errno);
75 }
76 
TEST(getcwd,manual_path_max)77 TEST(getcwd, manual_path_max) {
78   char* buf = new char[PATH_MAX];
79   errno = 0;
80   char* cwd = getcwd(buf, PATH_MAX);
81   ASSERT_TRUE(cwd == buf);
82   ASSERT_EQ(0, errno);
83   ASSERT_GE(strlen(cwd), 1U);
84   delete[] cwd;
85 }
86