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      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 
     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 
     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 
     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 
     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 
     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 
     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 
     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