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support: Add TEST_COMPARE_BLOB, support_quote_blob

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The declaration of support_test_compare_blob uses unsigned long int,
to avoid including <stddef.h>.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer 2018-05-16 17:00:35 +02:00
parent 9761bf4dfa
commit 2afece36f6
8 changed files with 390 additions and 0 deletions
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13
ChangeLog
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@ -1,3 +1,16 @@
2018-05-16 Florian Weimer <fweimer@redhat.com>
* support/Makefile (libsupport-routines): Add support_quote_blob,
support_test_compare_blob.
(tests): Add tst-support_quote_blob, tst-test_compare_blob.
* support/check.h (TEST_COMPARE_BLOB): Define.
(support_test_compare_blob): Declare.
* support/support.h (support_quote_blob): Declare.
* support/support_quote_blob.c: New file.
* support/support_test_compare_blob.c: Likewise.
* support/tst-support_quote_blob.c: Likewise.
* support/tst-test_compare_blob.c: Likewise.
2018-05-16 Florian Weimer <fweimer@redhat.com>
* stdlib/strtod_nan.c: Include <math-type-macros-double.h> instead

4
support/Makefile
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@ -53,9 +53,11 @@ libsupport-routines = \
support_format_netent \
support_isolate_in_subprocess \
support_openpty \
support_quote_blob \
support_record_failure \
support_run_diff \
support_shared_allocate \
support_test_compare_blob \
support_test_compare_failure \
support_write_file_string \
support_test_main \
@ -151,8 +153,10 @@ tests = \
tst-support-namespace \
tst-support_capture_subprocess \
tst-support_format_dns_packet \
tst-support_quote_blob \
tst-support_record_failure \
tst-test_compare \
tst-test_compare_blob \
tst-xreadlink \
ifeq ($(run-built-tests),yes)

22
support/check.h
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@ -64,6 +64,8 @@ __BEGIN_DECLS
(1, __FILE__, __LINE__, #expr); \
})
int support_print_failure_impl (const char *file, int line,
const char *format, ...)
__attribute__ ((nonnull (1), format (printf, 3, 4)));
@ -141,6 +143,26 @@ void support_test_compare_failure (const char *file, int line,
int right_size);
/* Compare [LEFT, LEFT + LEFT_LENGTH) with [RIGHT, RIGHT +
RIGHT_LENGTH) and report a test failure if the arrays are
different. LEFT_LENGTH and RIGHT_LENGTH are measured in bytes. If
the length is null, the corresponding pointer is ignored (i.e., it
can be NULL). The blobs should be reasonably short because on
mismatch, both are printed. */
#define TEST_COMPARE_BLOB(left, left_length, right, right_length) \
(support_test_compare_blob (left, left_length, right, right_length, \
__FILE__, __LINE__, \
#left, #left_length, #right, #right_length))
void support_test_compare_blob (const void *left,
unsigned long int left_length,
const void *right,
unsigned long int right_length,
const char *file, int line,
const char *left_exp, const char *left_len_exp,
const char *right_exp,
const char *right_len_exp);
/* Internal function called by the test driver. */
int support_report_failure (int status)
__attribute__ ((weak, warn_unused_result));

6
support/support.h
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@ -59,6 +59,12 @@ void support_shared_free (void *);
process on error. */
void support_write_file_string (const char *path, const char *contents);
/* Quote the contents of the byte array starting at BLOB, of LENGTH
bytes, in such a way that the result string can be included in a C
literal (in single/double quotes, without putting the quotes into
the result). */
char *support_quote_blob (const void *blob, size_t length);
/* Error-checking wrapper functions which terminate the process on
error. */

83
support/support_quote_blob.c Normal file
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@ -0,0 +1,83 @@
/* Quote a blob so that it can be used in C literals.
Copyright (C) 2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <support/support.h>
#include <support/xmemstream.h>
char *
support_quote_blob (const void *blob, size_t length)
{
struct xmemstream out;
xopen_memstream (&out);
const unsigned char *p = blob;
for (size_t i = 0; i < length; ++i)
{
unsigned char ch = p[i];
/* Use C backslash escapes for those control characters for
which they are defined. */
switch (ch)
{
case '\a':
putc_unlocked ('\\', out.out);
putc_unlocked ('a', out.out);
break;
case '\b':
putc_unlocked ('\\', out.out);
putc_unlocked ('b', out.out);
break;
case '\f':
putc_unlocked ('\\', out.out);
putc_unlocked ('f', out.out);
break;
case '\n':
putc_unlocked ('\\', out.out);
putc_unlocked ('n', out.out);
break;
case '\r':
putc_unlocked ('\\', out.out);
putc_unlocked ('r', out.out);
break;
case '\t':
putc_unlocked ('\\', out.out);
putc_unlocked ('t', out.out);
break;
case '\v':
putc_unlocked ('\\', out.out);
putc_unlocked ('v', out.out);
break;
case '\\':
case '\'':
case '\"':
putc_unlocked ('\\', out.out);
putc_unlocked (ch, out.out);
break;
default:
if (ch < ' ' || ch > '~')
/* Use octal sequences because they are fixed width,
unlike hexadecimal sequences. */
fprintf (out.out, "\\%03o", ch);
else
putc_unlocked (ch, out.out);
}
}
xfclose_memstream (&out);
return out.buffer;
}

76
support/support_test_compare_blob.c Normal file
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@ -0,0 +1,76 @@
/* Check two binary blobs for equality.
Copyright (C) 2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xmemstream.h>
static void
report_length (const char *what, unsigned long int length, const char *expr)
{
printf (" %s %lu bytes (from %s)\n", what, length, expr);
}
static void
report_blob (const char *what, const unsigned char *blob,
unsigned long int length, const char *expr)
{
if (length > 0)
{
printf (" %s (evaluated from %s):\n", what, expr);
char *quoted = support_quote_blob (blob, length);
printf (" \"%s\"\n", quoted);
free (quoted);
fputs (" ", stdout);
for (unsigned long i = 0; i < length; ++i)
printf (" %02X", blob[i]);
putc ('\n', stdout);
}
}
void
support_test_compare_blob (const void *left, unsigned long int left_length,
const void *right, unsigned long int right_length,
const char *file, int line,
const char *left_expr, const char *left_len_expr,
const char *right_expr, const char *right_len_expr)
{
/* No differences are possible if both lengths are null. */
if (left_length == 0 && right_length == 0)
return;
if (left_length != right_length || left == NULL || right == NULL
|| memcmp (left, right, left_length) != 0)
{
support_record_failure ();
printf ("%s:%d: error: blob comparison failed\n", file, line);
if (left_length == right_length)
printf (" blob length: %lu bytes\n", left_length);
else
{
report_length ("left length: ", left_length, left_len_expr);
report_length ("right length:", right_length, right_len_expr);
}
report_blob ("left", left, left_length, left_expr);
report_blob ("right", right, right_length, right_expr);
}
}

61
support/tst-support_quote_blob.c Normal file
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@ -0,0 +1,61 @@
/* Test the support_quote_blob function.
Copyright (C) 2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <support/check.h>
#include <support/support.h>
#include <string.h>
#include <stdlib.h>
static int
do_test (void)
{
/* Check handling of the empty blob, both with and without trailing
NUL byte. */
char *p = support_quote_blob ("", 0);
TEST_COMPARE (strlen (p), 0);
free (p);
p = support_quote_blob ("X", 0);
TEST_COMPARE (strlen (p), 0);
free (p);
/* Check escaping of backslash-escaped characters, and lack of
escaping for other shell meta-characters. */
p = support_quote_blob ("$()*?`@[]{}~\'\"X", 14);
TEST_COMPARE (strcmp (p, "$()*?`@[]{}~\\'\\\""), 0);
free (p);
/* Check lack of escaping for letters and digits. */
#define LETTERS_AND_DIGTS \
"abcdefghijklmnopqrstuvwxyz" \
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
"0123456789"
p = support_quote_blob (LETTERS_AND_DIGTS "@", 2 * 26 + 10);
TEST_COMPARE (strcmp (p, LETTERS_AND_DIGTS), 0);
free (p);
/* Check escaping of control characters and other non-printable
characters. */
p = support_quote_blob ("\r\n\t\a\b\f\v\1\177\200\377\0@", 14);
TEST_COMPARE (strcmp (p, "\\r\\n\\t\\a\\b\\f\\v\\001"
"\\177\\200\\377\\000@\\000"), 0);
free (p);
return 0;
}
#include <support/test-driver.c>

125
support/tst-test_compare_blob.c Normal file
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@ -0,0 +1,125 @@
/* Basic test for the TEST_COMPARE_BLOB macro.
Copyright (C) 2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <string.h>
#include <support/check.h>
#include <support/capture_subprocess.h>
static void
subprocess (void *closure)
{
/* These tests should fail. They were chosen to cover differences
in length (with the same contents), single-bit mismatches, and
mismatching null pointers. */
TEST_COMPARE_BLOB ("", 0, "", 1); /* Line 29. */
TEST_COMPARE_BLOB ("X", 1, "", 1); /* Line 30. */
TEST_COMPARE_BLOB ("abcd", 3, "abcd", 4); /* Line 31. */
TEST_COMPARE_BLOB ("abcd", 4, "abcD", 4); /* Line 32. */
TEST_COMPARE_BLOB ("abcd", 4, NULL, 0); /* Line 33. */
TEST_COMPARE_BLOB (NULL, 0, "abcd", 4); /* Line 34. */
}
/* Same contents, different addresses. */
char buffer_abc_1[] = "abc";
char buffer_abc_2[] = "abc";
static int
do_test (void)
{
/* This should succeed. Even if the pointers and array contents are
different, zero-length inputs are not different. */
TEST_COMPARE_BLOB ("", 0, "", 0);
TEST_COMPARE_BLOB ("", 0, buffer_abc_1, 0);
TEST_COMPARE_BLOB (buffer_abc_1, 0, "", 0);
TEST_COMPARE_BLOB (NULL, 0, "", 0);
TEST_COMPARE_BLOB ("", 0, NULL, 0);
TEST_COMPARE_BLOB (NULL, 0, NULL, 0);
/* Check equality of blobs containing a single NUL byte. */
TEST_COMPARE_BLOB ("", 1, "", 1);
TEST_COMPARE_BLOB ("", 1, &buffer_abc_1[3], 1);
/* Check equality of blobs of varying lengths. */
for (size_t i = 0; i <= sizeof (buffer_abc_1); ++i)
TEST_COMPARE_BLOB (buffer_abc_1, i, buffer_abc_2, i);
struct support_capture_subprocess proc = support_capture_subprocess
(&subprocess, NULL);
/* Discard the reported error. */
support_record_failure_reset ();
puts ("info: *** subprocess output starts ***");
fputs (proc.out.buffer, stdout);
puts ("info: *** subprocess output ends ***");
TEST_VERIFY
(strcmp (proc.out.buffer,
"tst-test_compare_blob.c:29: error: blob comparison failed\n"
" left length: 0 bytes (from 0)\n"
" right length: 1 bytes (from 1)\n"
" right (evaluated from \"\"):\n"
" \"\\000\"\n"
" 00\n"
"tst-test_compare_blob.c:30: error: blob comparison failed\n"
" blob length: 1 bytes\n"
" left (evaluated from \"X\"):\n"
" \"X\"\n"
" 58\n"
" right (evaluated from \"\"):\n"
" \"\\000\"\n"
" 00\n"
"tst-test_compare_blob.c:31: error: blob comparison failed\n"
" left length: 3 bytes (from 3)\n"
" right length: 4 bytes (from 4)\n"
" left (evaluated from \"abcd\"):\n"
" \"abc\"\n"
" 61 62 63\n"
" right (evaluated from \"abcd\"):\n"
" \"abcd\"\n"
" 61 62 63 64\n"
"tst-test_compare_blob.c:32: error: blob comparison failed\n"
" blob length: 4 bytes\n"
" left (evaluated from \"abcd\"):\n"
" \"abcd\"\n"
" 61 62 63 64\n"
" right (evaluated from \"abcD\"):\n"
" \"abcD\"\n"
" 61 62 63 44\n"
"tst-test_compare_blob.c:33: error: blob comparison failed\n"
" left length: 4 bytes (from 4)\n"
" right length: 0 bytes (from 0)\n"
" left (evaluated from \"abcd\"):\n"
" \"abcd\"\n"
" 61 62 63 64\n"
"tst-test_compare_blob.c:34: error: blob comparison failed\n"
" left length: 0 bytes (from 0)\n"
" right length: 4 bytes (from 4)\n"
" right (evaluated from \"abcd\"):\n"
" \"abcd\"\n"
" 61 62 63 64\n"
) == 0);
/* Check that there is no output on standard error. */
support_capture_subprocess_check (&proc, "TEST_COMPARE_BLOB",
0, sc_allow_stdout);
return 0;
}
#include <support/test-driver.c>