support/tst-test_compare_blob.c

   1 /* Basic test for the TEST_COMPARE_BLOB macro.
   2    Copyright (C) 2018-2022 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_BLOB ("", 0, "", 1);    /* Line 29.  */
  30   TEST_COMPARE_BLOB ("X", 1, "", 1);   /* Line 30.  */
  31   TEST_COMPARE_BLOB ("abcd", 3, "abcd", 4); /* Line 31.  */
  32   TEST_COMPARE_BLOB ("abcd", 4, "abcD", 4); /* Line 32.  */
  33   TEST_COMPARE_BLOB ("abcd", 4, NULL, 0); /* Line 33.  */
  34   TEST_COMPARE_BLOB (NULL, 0, "abcd", 4); /* 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_BLOB ("", 0, "", 0);
  47   TEST_COMPARE_BLOB ("", 0, buffer_abc_1, 0);
  48   TEST_COMPARE_BLOB (buffer_abc_1, 0, "", 0);
  49   TEST_COMPARE_BLOB (NULL, 0, "", 0);
  50   TEST_COMPARE_BLOB ("", 0, NULL, 0);
  51   TEST_COMPARE_BLOB (NULL, 0, NULL, 0);
  52
  53   /* Check equality of blobs containing a single NUL byte.  */
  54   TEST_COMPARE_BLOB ("", 1, "", 1);
  55   TEST_COMPARE_BLOB ("", 1, &buffer_abc_1[3], 1);
  56
  57   /* Check equality of blobs of varying lengths.  */
  58   for (size_t i = 0; i <= sizeof (buffer_abc_1); ++i)
  59     TEST_COMPARE_BLOB (buffer_abc_1, i, buffer_abc_2, i);
  60
  61   struct support_capture_subprocess proc = support_capture_subprocess
  62     (&subprocess, NULL);
  63
  64   /* Discard the reported error.  */
  65   support_record_failure_reset ();
  66
  67   puts ("info: *** subprocess output starts ***");
  68   fputs (proc.out.buffer, stdout);
  69   puts ("info: *** subprocess output ends ***");
  70
  71   TEST_VERIFY
  72     (strcmp (proc.out.buffer,
  73 "tst-test_compare_blob.c:29: error: blob comparison failed\n"
  74 "  left length:  0 bytes (from 0)\n"
  75 "  right length: 1 bytes (from 1)\n"
  76 "  right (evaluated from \"\"):\n"
  77 "      \"\\000\"\n"
  78 "      00\n"
  79 "tst-test_compare_blob.c:30: error: blob comparison failed\n"
  80 "  blob length: 1 bytes\n"
  81 "  left (evaluated from \"X\"):\n"
  82 "      \"X\"\n"
  83 "      58\n"
  84 "  right (evaluated from \"\"):\n"
  85 "      \"\\000\"\n"
  86 "      00\n"
  87 "tst-test_compare_blob.c:31: error: blob comparison failed\n"
  88 "  left length:  3 bytes (from 3)\n"
  89 "  right length: 4 bytes (from 4)\n"
  90 "  left (evaluated from \"abcd\"):\n"
  91 "      \"abc\"\n"
  92 "      61 62 63\n"
  93 "  right (evaluated from \"abcd\"):\n"
  94 "      \"abcd\"\n"
  95 "      61 62 63 64\n"
  96 "tst-test_compare_blob.c:32: error: blob comparison failed\n"
  97 "  blob length: 4 bytes\n"
  98 "  left (evaluated from \"abcd\"):\n"
  99 "      \"abcd\"\n"
 100 "      61 62 63 64\n"
 101 "  right (evaluated from \"abcD\"):\n"
 102 "      \"abcD\"\n"
 103 "      61 62 63 44\n"
 104 "tst-test_compare_blob.c:33: error: blob comparison failed\n"
 105 "  left length:  4 bytes (from 4)\n"
 106 "  right length: 0 bytes (from 0)\n"
 107 "  left (evaluated from \"abcd\"):\n"
 108 "      \"abcd\"\n"
 109 "      61 62 63 64\n"
 110 "tst-test_compare_blob.c:34: error: blob comparison failed\n"
 111 "  left length:  0 bytes (from 0)\n"
 112 "  right length: 4 bytes (from 4)\n"
 113 "  right (evaluated from \"abcd\"):\n"
 114 "      \"abcd\"\n"
 115 "      61 62 63 64\n"
 116              ) == 0);
 117
 118   /* Check that there is no output on standard error.  */
 119   support_capture_subprocess_check (&proc, "TEST_COMPARE_BLOB",
 120                                     0, sc_allow_stdout);
 121
 122   return 0;
 123 }
 124
 125 #include <support/test-driver.c>