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/* This file is part of GNU Mailutils test suite
Copyright (C) 2020-2021 Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
/*
* Mailutils versions up to release-3.9-11-ge863e55 contained a bug in stream
* buffering code, due to which a write occurring after a read caused the
* buffer to be flushed and the stream pointer advanced to the next chunk.
* As a result, the data were written to the next buffer. This test verifies
* that it is no longer the case by
* 1. Reading 128 bytes at position 10
* 2. Writing 2 bytes at current position.
* 3. Reverting to position 138
* 4. Reading 2 bytes.
* Obviously, the bytes obtained in 4 should be the same as those written in 2.
*/
#include <config.h>
#include <mailutils/mailutils.h>
char mem[1024];
int
main (int argc, char **argv)
{
mu_stream_t str;
char buf[128];
static char pattern[] = { 'A', 'B' };
memset (mem, '.', sizeof (mem));
MU_ASSERT (mu_fixed_memory_stream_create (&str, mem, sizeof (mem),
MU_STREAM_RDWR));
MU_ASSERT (mu_stream_set_buffer (str, mu_buffer_full, 512));
MU_ASSERT (mu_stream_seek (str, 10, MU_SEEK_SET, NULL));
MU_ASSERT (mu_stream_read (str, buf, sizeof (buf), NULL));
MU_ASSERT (mu_stream_write (str, pattern, sizeof (pattern), NULL));
MU_ASSERT (mu_stream_seek (str, -2, MU_SEEK_CUR, NULL));
MU_ASSERT (mu_stream_read (str, buf, sizeof (pattern), NULL));
if (memcmp (buf, pattern, sizeof (pattern)))
{
int i;
static int bs = 64;
fprintf (stderr, "FAIL\n");
mu_stream_flush (str);
for (i = 0; i < sizeof (mem); i++)
{
if (i % bs == 0)
{
if (i)
putchar ('\n');
printf ("%03X: ", i);
}
putchar (mem[i]);
}
putchar ('\n');
return 1;
}
return 0;
}
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