support/support_test_compare_string_main.c

   1 /* Check two strings for equality.
   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 <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <wchar.h>
  23 #include <support/check.h>
  24 #include <support/support.h>
  25 #include <support/xmemstream.h>
  26
  27 static void
  28 report_length (const char *what, const CHAR *str, size_t length)
  29 {
  30   if (str == NULL)
  31     printf ("  %s string: NULL\n", what);
  32   else
  33     printf ("  %s string: %zu %s\n", what, length,
  34             WIDE ? "wide characters" : "bytes");
  35 }
  36
  37 static void
  38 report_string (const char *what, const UCHAR *blob,
  39                size_t length, const char *expr)
  40 {
  41   if (length > 0)
  42     {
  43       printf ("  %s (evaluated from %s):\n", what, expr);
  44       char *quoted = SUPPORT_QUOTE_BLOB (blob, length);
  45       printf ("      %s\"%s\"\n", LPREFIX, quoted);
  46       free (quoted);
  47
  48       fputs ("     ", stdout);
  49       for (size_t i = 0; i < length; ++i)
  50         printf (" %02X", (unsigned int) blob[i]);
  51       putc ('\n', stdout);
  52     }
  53 }
  54
  55 static size_t
  56 string_length_or_zero (const CHAR *str)
  57 {
  58   if (str == NULL)
  59     return 0;
  60   else
  61     return STRLEN (str);
  62 }
  63
  64 void
  65 SUPPORT_TEST_COMPARE_STRING (const CHAR *left, const CHAR *right,
  66                              const char *file, int line,
  67                              const char *left_expr, const char *right_expr)
  68 {
  69   /* Two null pointers are accepted.  */
  70   if (left == NULL && right == NULL)
  71     return;
  72
  73   size_t left_length = string_length_or_zero (left);
  74   size_t right_length = string_length_or_zero (right);
  75
  76   if (left_length != right_length || left == NULL || right == NULL
  77       || MEMCMP (left, right, left_length) != 0)
  78     {
  79       support_record_failure ();
  80       printf ("%s:%d: error: string comparison failed\n", file, line);
  81       if (left_length == right_length && right != NULL && left != NULL)
  82         printf ("  string length: %zu %s\n", left_length,
  83                 WIDE ? "wide characters" : "bytes");
  84       else
  85         {
  86           report_length ("left", left, left_length);
  87           report_length ("right", right, right_length);
  88         }
  89       report_string ("left", (const UCHAR *) left,
  90                      left_length, left_expr);
  91       report_string ("right", (const UCHAR *) right,
  92                      right_length, right_expr);
  93     }
  94 }