support/tst-test_compare_string.c

   1 /* Basic test for the TEST_COMPARE_STRING macro.
   2    Copyright (C) 2018-2023 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 <string.h>
  20 #include <support/check.h>
  21 #include <support/capture_subprocess.h>
  22
  23 static void
  24 subprocess (void *closure)
  25 {
  26   /* These tests should fail.  They were chosen to cover differences
  27      in length (with the same contents), single-bit mismatches, and
  28      mismatching null pointers.  */
  29   TEST_COMPARE_STRING ("", NULL);             /* Line 29.  */
  30   TEST_COMPARE_STRING ("X", "");              /* Line 30.  */
  31   TEST_COMPARE_STRING (NULL, "X");            /* Line 31.  */
  32   TEST_COMPARE_STRING ("abcd", "abcD");       /* Line 32.  */
  33   TEST_COMPARE_STRING ("abcd", NULL);         /* Line 33.  */
  34   TEST_COMPARE_STRING (NULL, "abcd");         /* Line 34.  */
  35 }
  36
  37 /* Same contents, different addresses.  */
  38 char buffer_abc_1[] = "abc";
  39 char buffer_abc_2[] = "abc";
  40
  41 static int
  42 do_test (void)
  43 {
  44   /* This should succeed.  Even if the pointers and array contents are
  45      different, zero-length inputs are not different.  */
  46   TEST_COMPARE_STRING (NULL, NULL);
  47   TEST_COMPARE_STRING ("", "");
  48   TEST_COMPARE_STRING (buffer_abc_1, buffer_abc_2);
  49   TEST_COMPARE_STRING (buffer_abc_1, "abc");
  50
  51   struct support_capture_subprocess proc = support_capture_subprocess
  52     (&subprocess, NULL);
  53
  54   /* Discard the reported error.  */
  55   support_record_failure_reset ();
  56
  57   puts ("info: *** subprocess output starts ***");
  58   fputs (proc.out.buffer, stdout);
  59   puts ("info: *** subprocess output ends ***");
  60
  61   TEST_VERIFY
  62     (strcmp (proc.out.buffer,
  63 "tst-test_compare_string.c:29: error: string comparison failed\n"
  64 "  left string: 0 bytes\n"
  65 "  right string: NULL\n"
  66 "tst-test_compare_string.c:30: error: string comparison failed\n"
  67 "  left string: 1 bytes\n"
  68 "  right string: 0 bytes\n"
  69 "  left (evaluated from \"X\"):\n"
  70 "      \"X\"\n"
  71 "      58\n"
  72 "tst-test_compare_string.c:31: error: string comparison failed\n"
  73 "  left string: NULL\n"
  74 "  right string: 1 bytes\n"
  75 "  right (evaluated from \"X\"):\n"
  76 "      \"X\"\n"
  77 "      58\n"
  78 "tst-test_compare_string.c:32: error: string comparison failed\n"
  79 "  string length: 4 bytes\n"
  80 "  left (evaluated from \"abcd\"):\n"
  81 "      \"abcd\"\n"
  82 "      61 62 63 64\n"
  83 "  right (evaluated from \"abcD\"):\n"
  84 "      \"abcD\"\n"
  85 "      61 62 63 44\n"
  86 "tst-test_compare_string.c:33: error: string comparison failed\n"
  87 "  left string: 4 bytes\n"
  88 "  right string: NULL\n"
  89 "  left (evaluated from \"abcd\"):\n"
  90 "      \"abcd\"\n"
  91 "      61 62 63 64\n"
  92 "tst-test_compare_string.c:34: error: string comparison failed\n"
  93 "  left string: NULL\n"
  94 "  right string: 4 bytes\n"
  95 "  right (evaluated from \"abcd\"):\n"
  96 "      \"abcd\"\n"
  97 "      61 62 63 64\n"
  98              ) == 0);
  99
 100   /* Check that there is no output on standard error.  */
 101   support_capture_subprocess_check (&proc, "TEST_COMPARE_STRING",
 102                                     0, sc_allow_stdout);
 103
 104   return 0;
 105 }
 106
 107 #include <support/test-driver.c>