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/* Test for fgetsgent_r and buffer sizes.
Copyright (C) 2020-2025 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
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <errno.h>
#include <gshadow.h>
#include <stdbool.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xmemstream.h>
#include <support/xstdio.h>
/* Turn a parsed struct back into a line string. The returned string
should be freed. */
static char *
format_ent (const struct sgrp *e)
{
struct xmemstream stream;
xopen_memstream (&stream);
TEST_COMPARE (putsgent (e, stream.out), 0);
xfclose_memstream (&stream);
return stream.buffer;
}
/* An entry in the input file along with the expected output. */
struct input
{
const char *line; /* Line in the file. */
const char *expected; /* Expected output. NULL if skipped. */
};
const struct input inputs[] =
{
/* Regular entries. */
{ "g1:x1::\n", "g1:x1::\n" },
{ "g2:x2:a1:\n", "g2:x2:a1:\n" },
{ "g3:x3:a2:u1\n", "g3:x3:a2:u1\n" },
{ "g4:x4:a3,a4:u2,u3,u4\n", "g4:x4:a3,a4:u2,u3,u4\n" },
/* Comments and empty lines. */
{ "\n", NULL },
{ " \n", NULL },
{ "\t\n", NULL },
{ "#g:x::\n", NULL },
{ " #g:x::\n", NULL },
{ "\t#g:x::\n", NULL },
{ " \t#g:x::\n", NULL },
/* Marker for synchronization. */
{ "g5:x5::\n", "g5:x5::\n" },
/* Leading whitespace. */
{ " g6:x6::\n", "g6:x6::\n" },
{ "\tg7:x7::\n", "g7:x7::\n" },
/* This is expected to trigger buffer exhaustion during parsing
(bug 20338). */
{
"g8:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:u5,u6,u7,u8,u9:\n",
"g8:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:u5,u6,u7,u8,u9:\n",
},
{
"g9:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx::a5,a6,a7,a8,a9,a10\n",
"g9:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx::a5,a6,a7,a8,a9,a10\n",
},
};
/* Writes the test data to a temporary file and returns its name. The
returned pointer should be freed. */
static char *
create_test_file (void)
{
char *path;
int fd = create_temp_file ("tst-fgetsgent_r-", &path);
FILE *fp = fdopen (fd, "w");
TEST_VERIFY_EXIT (fp != NULL);
for (size_t i = 0; i < array_length (inputs); ++i)
fputs (inputs[i].line, fp);
xfclose (fp);
return path;
}
/* Read the test file with the indicated start buffer size. Return
true if the buffer size had to be increased during reading. */
static bool
run_test (const char *path, size_t buffer_size)
{
bool resized = false;
FILE *fp = xfopen (path, "r");
/* This avoids repeated lseek system calls (bug 26257). */
TEST_COMPARE (fseeko64 (fp, 0, SEEK_SET), 0);
size_t i = 0;
while (true)
{
/* Skip over unused expected entries. */
while (i < array_length (inputs) && inputs[i].expected == NULL)
++i;
/* Store the data on the heap, to help valgrind to detect
invalid accesses. */
struct sgrp *result_storage = xmalloc (sizeof (*result_storage));
char *buffer = xmalloc (buffer_size);
struct sgrp **result_pointer_storage
= xmalloc (sizeof (*result_pointer_storage));
int ret = fgetsgent_r (fp, result_storage, buffer, buffer_size,
result_pointer_storage);
if (ret == 0)
{
TEST_VERIFY (*result_pointer_storage != NULL);
TEST_VERIFY (i < array_length (inputs));
if (*result_pointer_storage != NULL
&& i < array_length (inputs))
{
char * actual = format_ent (*result_pointer_storage);
TEST_COMPARE_STRING (inputs[i].expected, actual);
free (actual);
++i;
}
else
break;
}
else
{
TEST_VERIFY (*result_pointer_storage == NULL);
TEST_COMPARE (ret, errno);
if (ret == ENOENT)
{
TEST_COMPARE (i, array_length (inputs));
free (result_pointer_storage);
free (buffer);
free (result_storage);
break;
}
else if (ret == ERANGE)
{
resized = true;
++buffer_size;
}
else
FAIL_EXIT1 ("read failure: %m");
}
free (result_pointer_storage);
free (buffer);
free (result_storage);
}
xfclose (fp);
return resized;
}
static int
do_test (void)
{
char *path = create_test_file ();
for (size_t buffer_size = 3; ; ++buffer_size)
{
bool resized = run_test (path, buffer_size);
if (!resized)
break;
}
free (path);
return 0;
}
#include <support/test-driver.c>
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