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libexpat/expat/tests/common.c
Sebastian Pipping 5b9e8dc70c
portable_strndup() must not read source string beyond NUL byte. 
POSIX strndup() does not read memory beyond NUL byte of the source
string.  Preserve this behavior in libexpat implementation to prevent
access violations and keep portability.
2025-03-30 18:06:32 +02:00

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C
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/* Commonly used functions for the Expat test suite
__ __ _
___\ \/ /_ __ __ _| |_
/ _ \\ /| '_ \ / _` | __|
| __// \| |_) | (_| | |_
\___/_/\_\ .__/ \__,_|\__|
|_| XML parser
Copyright (c) 2001-2006 Fred L. Drake, Jr. <fdrake@users.sourceforge.net>
Copyright (c) 2003 Greg Stein <gstein@users.sourceforge.net>
Copyright (c) 2005-2007 Steven Solie <steven@solie.ca>
Copyright (c) 2005-2012 Karl Waclawek <karl@waclawek.net>
Copyright (c) 2016-2025 Sebastian Pipping <sebastian@pipping.org>
Copyright (c) 2017-2022 Rhodri James <rhodri@wildebeest.org.uk>
Copyright (c) 2017 Joe Orton <jorton@redhat.com>
Copyright (c) 2017 José Gutiérrez de la Concha <jose@zeroc.com>
Copyright (c) 2018 Marco Maggi <marco.maggi-ipsu@poste.it>
Copyright (c) 2019 David Loffredo <loffredo@steptools.com>
Copyright (c) 2020 Tim Gates <tim.gates@iress.com>
Copyright (c) 2021 Donghee Na <donghee.na@python.org>
Copyright (c) 2023-2024 Sony Corporation / Snild Dolkow <snild@sony.com>
Licensed under the MIT license:
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the
following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <assert.h>
#include <errno.h>
#include <stdint.h> // for SIZE_MAX
#include <stdio.h>
#include <string.h>
#include "expat_config.h"
#include "expat.h"
#include "internal.h"
#include "chardata.h"
#include "minicheck.h"
#include "common.h"
#include "handlers.h"
/* Common test data */
const char *long_character_data_text
= "<?xml version='1.0' encoding='iso-8859-1'?><s>"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"</s>";
const char *long_cdata_text
= "<s><![CDATA["
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"012345678901234567890123456789012345678901234567890123456789"
"]]></s>";
/* Having an element name longer than 1024 characters exercises some
* of the pool allocation code in the parser that otherwise does not
* get executed. The count at the end of the line is the number of
* characters (bytes) in the element name by that point.x
*/
const char *get_buffer_test_text
= "<documentwitharidiculouslylongelementnametotease" /* 0x030 */
"aparticularcorneroftheallocationinXML_GetBuffers" /* 0x060 */
"othatwecanimprovethecoverageyetagain012345678901" /* 0x090 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x0c0 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x0f0 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x120 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x150 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x180 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x1b0 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x1e0 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x210 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x240 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x270 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x2a0 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x2d0 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x300 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x330 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x360 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x390 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x3c0 */
"123456789abcdef0123456789abcdef0123456789abcdef0" /* 0x3f0 */
"123456789abcdef0123456789abcdef0123456789>\n<ef0"; /* 0x420 */
/* Test control globals */
/* Used as the "resumable" parameter to XML_StopParser by some tests */
XML_Bool g_resumable = XML_FALSE;
/* Used to control abort checks in some tests */
XML_Bool g_abortable = XML_FALSE;
/* Used to control _XML_Parse_SINGLE_BYTES() chunk size */
int g_chunkSize = 1;
/* Common test functions */
void
tcase_add_test__ifdef_xml_dtd(TCase *tc, tcase_test_function test) {
#ifdef XML_DTD
tcase_add_test(tc, test);
#else
UNUSED_P(tc);
UNUSED_P(test);
#endif
}
void
tcase_add_test__if_xml_ge(TCase *tc, tcase_test_function test) {
#if XML_GE == 1
tcase_add_test(tc, test);
#else
UNUSED_P(tc);
UNUSED_P(test);
#endif
}
void
basic_teardown(void) {
if (g_parser != NULL) {
XML_ParserFree(g_parser);
g_parser = NULL;
}
}
/* Generate a failure using the parser state to create an error message;
this should be used when the parser reports an error we weren't
expecting.
*/
void
_xml_failure(XML_Parser parser, const char *file, int line) {
char buffer[1024];
enum XML_Error err = XML_GetErrorCode(parser);
snprintf(buffer, sizeof(buffer),
" %d: %" XML_FMT_STR " (line %" XML_FMT_INT_MOD
"u, offset %" XML_FMT_INT_MOD "u)\n reported from %s, line %d\n",
err, XML_ErrorString(err), XML_GetCurrentLineNumber(parser),
XML_GetCurrentColumnNumber(parser), file, line);
_fail(file, line, buffer);
}
enum XML_Status
_XML_Parse_SINGLE_BYTES(XML_Parser parser, const char *s, int len,
int isFinal) {
// This ensures that tests have to run pathological parse cases
// (e.g. when `s` is NULL) against plain XML_Parse rather than
// chunking _XML_Parse_SINGLE_BYTES.
assert((parser != NULL) && (s != NULL) && (len >= 0));
const int chunksize = g_chunkSize;
if (chunksize > 0) {
// parse in chunks of `chunksize` bytes as long as not exhausting
for (; len > chunksize; len -= chunksize, s += chunksize) {
enum XML_Status res = XML_Parse(parser, s, chunksize, XML_FALSE);
if (res != XML_STATUS_OK) {
if ((res == XML_STATUS_SUSPENDED) && (len > chunksize)) {
fail("Use of function _XML_Parse_SINGLE_BYTES with a chunk size "
"greater than 0 (from g_chunkSize) does not work well with "
"suspension. Please consider use of plain XML_Parse at this "
"place in your test, instead.");
}
return res;
}
}
}
// parse the final chunk, the size of which will be <= chunksize
return XML_Parse(parser, s, len, isFinal);
}
void
_expect_failure(const char *text, enum XML_Error errorCode,
const char *errorMessage, const char *file, int lineno) {
if (_XML_Parse_SINGLE_BYTES(g_parser, text, (int)strlen(text), XML_TRUE)
== XML_STATUS_OK)
/* Hackish use of _fail() macro, but lets us report
the right filename and line number. */
_fail(file, lineno, errorMessage);
if (XML_GetErrorCode(g_parser) != errorCode)
_xml_failure(g_parser, file, lineno);
}
void
_run_character_check(const char *text, const XML_Char *expected,
const char *file, int line) {
CharData storage;
CharData_Init(&storage);
XML_SetUserData(g_parser, &storage);
XML_SetCharacterDataHandler(g_parser, accumulate_characters);
if (_XML_Parse_SINGLE_BYTES(g_parser, text, (int)strlen(text), XML_TRUE)
== XML_STATUS_ERROR)
_xml_failure(g_parser, file, line);
CharData_CheckXMLChars(&storage, expected);
}
void
_run_attribute_check(const char *text, const XML_Char *expected,
const char *file, int line) {
CharData storage;
CharData_Init(&storage);
XML_SetUserData(g_parser, &storage);
XML_SetStartElementHandler(g_parser, accumulate_attribute);
if (_XML_Parse_SINGLE_BYTES(g_parser, text, (int)strlen(text), XML_TRUE)
== XML_STATUS_ERROR)
_xml_failure(g_parser, file, line);
CharData_CheckXMLChars(&storage, expected);
}
void
_run_ext_character_check(const char *text, ExtTest *test_data,
const XML_Char *expected, const char *file, int line) {
CharData *const storage = (CharData *)malloc(sizeof(CharData));
CharData_Init(storage);
test_data->storage = storage;
XML_SetUserData(g_parser, test_data);
XML_SetCharacterDataHandler(g_parser, ext_accumulate_characters);
if (_XML_Parse_SINGLE_BYTES(g_parser, text, (int)strlen(text), XML_TRUE)
== XML_STATUS_ERROR)
_xml_failure(g_parser, file, line);
CharData_CheckXMLChars(storage, expected);
free(storage);
}
/* Control variable; the number of times duff_allocator() will successfully
* allocate */
#define ALLOC_ALWAYS_SUCCEED (-1)
#define REALLOC_ALWAYS_SUCCEED (-1)
int g_allocation_count = ALLOC_ALWAYS_SUCCEED;
int g_reallocation_count = REALLOC_ALWAYS_SUCCEED;
/* Crocked allocator for allocation failure tests */
void *
duff_allocator(size_t size) {
if (g_allocation_count == 0)
return NULL;
if (g_allocation_count != ALLOC_ALWAYS_SUCCEED)
g_allocation_count--;
return malloc(size);
}
/* Crocked reallocator for allocation failure tests */
void *
duff_reallocator(void *ptr, size_t size) {
if (g_reallocation_count == 0)
return NULL;
if (g_reallocation_count != REALLOC_ALWAYS_SUCCEED)
g_reallocation_count--;
return realloc(ptr, size);
}
// Portable remake of strnlen(3) for C99
static size_t
portable_strnlen(const char *s, size_t maxlen) {
const char *const end = (const char *)memchr(s, '\0', maxlen);
return (end == NULL) ? maxlen : (size_t)(end - s);
}
// Portable remake of strndup(3) for C99
char *
portable_strndup(const char *s, size_t n) {
if ((s == NULL) || (n == SIZE_MAX)) {
errno = EINVAL;
return NULL;
}
n = portable_strnlen(s, n);
char *const buffer = (char *)malloc(n + 1);
if (buffer == NULL) {
errno = ENOMEM;
return NULL;
}
errno = 0;
memcpy(buffer, s, n);
buffer[n] = '\0';
return buffer;
}
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