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/* Test the __libc_readline_unlocked 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/>. */
/* Exercise __libc_readline_unlocked with various combinations of line
lengths, stdio buffer sizes, and line read buffer sizes. */
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xmemstream.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
enum
{
maximum_line_length = 7,
number_of_lines = 3,
};
/* -1: Do not set buffer size. 0: unbuffered. Otherwise, use this as
the size of the buffer. */
static int buffer_size;
/* These size of the buffer used for reading. Must be at least 2. */
static int read_size;
/* If a read files with ERANGE, increase the buffer size by this
amount. Must be positive. */
static int read_size_increment;
/* If non-zero, do not reset the read size after an ERANGE error. */
static int read_size_preserve;
/* If non-zero, no '\n' at the end of the file. */
static int no_newline_at_eof;
/* Length of the line, or -1 if the line is not present. */
static int line_lengths[number_of_lines];
/* The name of the test file. */
static char *test_file_path;
/* The contents of the test file. */
static char expected_contents[(maximum_line_length + 2) * number_of_lines + 1];
static size_t expected_length;
/* Returns a random byte which is not zero or the line terminator. */
static char
random_char (void)
{
static unsigned int rand_state = 1;
while (true)
{
char result = rand_r (&rand_state) >> 16;
if (result != 0 && result != '\n')
return result;
}
}
/* Create the test file. */
static void
prepare (int argc, char **argv)
{
int fd = create_temp_file ("tst-readline-", &test_file_path);
TEST_VERIFY_EXIT (fd >= 0);
xclose (fd);
}
/* Prepare the test file. Return false if the test parameters are
incongruent and the test should be skipped. */
static bool
write_test_file (void)
{
expected_length = 0;
char *p = expected_contents;
for (int lineno = 0; lineno < number_of_lines; ++lineno)
for (int i = 0; i < line_lengths[lineno]; ++i)
*p++ = random_char ();
expected_length = p - &expected_contents[0];
if (no_newline_at_eof)
{
if (expected_length == 0)
return false;
--expected_length;
--p;
}
if (test_verbose > 0)
{
printf ("info: writing test file of %zu bytes:\n", expected_length);
for (int i = 0; i < number_of_lines; ++i)
printf (" line %d: %d\n", i, line_lengths[i]);
if (no_newline_at_eof)
puts (" (no newline at EOF)");
}
TEST_VERIFY_EXIT (expected_length < sizeof (expected_contents));
*p++ = '\0';
support_write_file_string (test_file_path, expected_contents);
return true;
}
/* Run a single test (a combination of a test file and read
parameters). */
static void
run_test (void)
{
TEST_VERIFY_EXIT (read_size_increment > 0);
if (test_verbose > 0)
{
printf ("info: running test: buffer_size=%d read_size=%d\n"
" read_size_increment=%d read_size_preserve=%d\n",
buffer_size, read_size, read_size_increment, read_size_preserve);
}
struct xmemstream result;
xopen_memstream (&result);
FILE *fp = xfopen (test_file_path, "rce");
char *fp_buffer = NULL;
if (buffer_size == 0)
TEST_VERIFY_EXIT (setvbuf (fp, NULL, _IONBF, 0) == 0);
if (buffer_size > 0)
{
fp_buffer = xmalloc (buffer_size);
TEST_VERIFY_EXIT (setvbuf (fp, fp_buffer, _IOFBF, buffer_size) == 0);
}
char *line_buffer = xmalloc (read_size);
size_t line_buffer_size = read_size;
while (true)
{
ssize_t ret = __libc_readline_unlocked
(fp, line_buffer, line_buffer_size);
if (ret < 0)
{
TEST_VERIFY (ret == -1);
if (errno != ERANGE)
FAIL_EXIT1 ("__libc_readline_unlocked: %m");
line_buffer_size += read_size_increment;
free (line_buffer);
line_buffer = xmalloc (line_buffer_size);
/* Try reading this line again. */
}
else if (ret == 0)
break;
else
{
/* A line has been read. Save it. */
TEST_VERIFY (ret == strlen (line_buffer));
const char *pnl = strchr (line_buffer, '\n');
/* If there is a \n, it must be at the end. */
TEST_VERIFY (pnl == NULL || pnl == line_buffer + ret - 1);
fputs (line_buffer, result.out);
/* Restore the original read size if required. */
if (line_buffer_size > read_size && !read_size_preserve)
{
line_buffer_size = read_size;
free (line_buffer);
line_buffer = xmalloc (line_buffer_size);
}
}
}
xfclose (fp);
free (fp_buffer);
free (line_buffer);
xfclose_memstream (&result);
TEST_VERIFY (result.length == expected_length);
TEST_VERIFY (strcmp (result.buffer, expected_contents) == 0);
if (test_verbose > 0)
{
printf ("info: expected (%zu): [[%s]]\n",
expected_length, expected_contents);
printf ("info: actual (%zu): [[%s]]\n", result.length, result.buffer);
}
free (result.buffer);
}
/* Test one test file with multiple read parameters. */
static void
test_one_file (void)
{
for (buffer_size = -1; buffer_size <= maximum_line_length + 1; ++buffer_size)
for (read_size = 2; read_size <= maximum_line_length + 2; ++read_size)
for (read_size_increment = 1; read_size_increment <= 4;
++read_size_increment)
for (read_size_preserve = 0; read_size_preserve < 2;
++read_size_preserve)
run_test ();
}
static int
do_test (void)
{
/* Set up the test file contents. */
for (line_lengths[0] = -1; line_lengths[0] <= maximum_line_length;
++line_lengths[0])
for (line_lengths[1] = -1; line_lengths[1] <= maximum_line_length;
++line_lengths[1])
for (line_lengths[2] = -1; line_lengths[2] <= maximum_line_length;
++line_lengths[2])
for (no_newline_at_eof = 0; no_newline_at_eof < 2; ++no_newline_at_eof)
{
if (!write_test_file ())
continue;
test_one_file ();
}
free (test_file_path);
return 0;
}
#define PREPARE prepare
#include <support/test-driver.c>
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