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85b0e1e8a6
Provide an explicit diagnostic if the length is positive, and do not just crash with a null pointer dereference. Null pointers are only valid if the length is zero, so this can only happen with a faulty test.
79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
/* Check two binary blobs for equality.
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Copyright (C) 2018-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/xmemstream.h>
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static void
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report_length (const char *what, unsigned long int length, const char *expr)
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{
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printf (" %s %lu bytes (from %s)\n", what, length, expr);
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}
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static void
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report_blob (const char *what, const unsigned char *blob,
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unsigned long int length, const char *expr)
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{
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if (blob == NULL && length > 0)
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printf (" %s (evaluated from %s): NULL\n", what, expr);
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else if (length > 0)
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{
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printf (" %s (evaluated from %s):\n", what, expr);
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char *quoted = support_quote_blob (blob, length);
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printf (" \"%s\"\n", quoted);
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free (quoted);
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fputs (" ", stdout);
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for (unsigned long i = 0; i < length; ++i)
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printf (" %02X", blob[i]);
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putc ('\n', stdout);
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}
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}
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void
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support_test_compare_blob (const void *left, unsigned long int left_length,
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const void *right, unsigned long int right_length,
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const char *file, int line,
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const char *left_expr, const char *left_len_expr,
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const char *right_expr, const char *right_len_expr)
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{
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/* No differences are possible if both lengths are null. */
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if (left_length == 0 && right_length == 0)
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return;
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if (left_length != right_length || left == NULL || right == NULL
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|| memcmp (left, right, left_length) != 0)
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{
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support_record_failure ();
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printf ("%s:%d: error: blob comparison failed\n", file, line);
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if (left_length == right_length)
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printf (" blob length: %lu bytes\n", left_length);
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else
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{
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report_length ("left length: ", left_length, left_len_expr);
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report_length ("right length:", right_length, right_len_expr);
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}
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report_blob ("left", left, left_length, left_expr);
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report_blob ("right", right, right_length, right_expr);
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}
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}
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