1  /*
       2   * Test printpath/umovestr.
       3   *
       4   * Copyright (c) 2015-2017 Dmitry V. Levin <ldv@strace.io>
       5   * Copyright (c) 2017-2022 The strace developers.
       6   * All rights reserved.
       7   *
       8   * SPDX-License-Identifier: GPL-2.0-or-later
       9   */
      10  
      11  #include "tests.h"
      12  
      13  #include <limits.h>
      14  #include <stdio.h>
      15  #include <string.h>
      16  #include <unistd.h>
      17  
      18  #include "test_ucopy.h"
      19  
      20  static void
      21  test_printpath_at(char *const p, const unsigned int test_max)
      22  {
      23  	/*
      24  	 *       /
      25  	 *      /.
      26  	 *     /..
      27  	 *    /../
      28  	 *   /../.
      29  	 *  /../..
      30  	 * /../../
      31  	 */
      32  
      33  	char *const eop = p + (test_max - 1);
      34  	*eop = '\0';
      35  	for (unsigned int i = 1; i < test_max; ++i) {
      36  		const unsigned int i_1 = i - 1;
      37  		memmove(eop - i, eop - i_1, i_1);
      38  		eop[-1] = "/.."[i_1 % 3];
      39  		if (chdir(eop - i))
      40  			perror_msg_and_fail("chdir");
      41  		printf("chdir(\"%s\") = 0\n", eop - i);
      42  	}
      43  }
      44  
      45  static void
      46  test_efault(const unsigned int test_max)
      47  {
      48  	char *p = tail_alloc(test_max);
      49  	const char *const efault = p + test_max;
      50  	memset(p, '/', test_max);
      51  
      52  	for (; p <= efault; ++p) {
      53  		if (p <= efault - PATH_MAX)
      54  			continue;
      55  		printf("chdir(%p) = %s\n", p, sprintrc(chdir(p)));
      56  	}
      57  }
      58  
      59  static void
      60  test_enametoolong(void)
      61  {
      62  	char *p = tail_alloc(PATH_MAX);
      63  	memset(p, '/', PATH_MAX);
      64  
      65  	printf("chdir(\"%.*s\"...) = %s\n",
      66  	       PATH_MAX - 1, p, sprintrc(chdir(p)));
      67  }
      68  
      69  void
      70  test_printpath(const unsigned int test_max)
      71  {
      72  	/*
      73  	 * /../..|
      74  	 * /../.|.
      75  	 * /../|..
      76  	 * /..|/..
      77  	 * /.|./..
      78  	 * /|../..
      79  	 * |/../..
      80  	 */
      81  	const unsigned int page_size = get_page_size();
      82  	char *p = tail_alloc(test_max + page_size);
      83  	for (unsigned int i = 1; i < sizeof(long); ++i)
      84  		test_printpath_at(p + i, test_max);
      85  	for (unsigned int i = 0; i < sizeof(long); ++i)
      86  		test_printpath_at(p + page_size - i, test_max);
      87  	test_efault(test_max);
      88  	test_enametoolong();
      89  }