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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2010-2025 Free Software Foundation, Inc.
This 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 3, or (at your option)
any later version.
This 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <mailutils/types.h>
#include <mailutils/stream.h>
#include <mailutils/errno.h>
#include <mailutils/sys/nullstream.h>
#include <mailutils/stream.h>
#include <mailutils/cctype.h>
static int
_nullstream_read (struct _mu_stream *str, char *buf, size_t bufsize,
size_t *pnread)
{
struct _mu_nullstream *np = (struct _mu_nullstream *)str;
size_t i;
mu_off_t off;
if (np->pattern == NULL)
{
*pnread = 0;
return 0;
}
off = np->base.offset + np->base.pos;
for (i = 0; i < bufsize; i++, off++)
{
if ((np->mode & MU_NULLSTREAM_SIZE) && off >= np->size)
break;
*buf++ = np->pattern[off % np->patsize];
}
*pnread = i;
return 0;
}
static int
_nullstream_write (struct _mu_stream *str, const char *buf, size_t bufsize,
size_t *pnwrite)
{
*pnwrite = bufsize;
return 0;
}
static void
_nullstream_free_pattern (struct _mu_nullstream *np)
{
if (!(np->mode & MU_NULLSTREAM_PATSTAT))
{
free (np->pattern);
np->mode &= ~MU_NULLSTREAM_PATSTAT;
}
np->pattern = NULL;
np->patsize = 0;
}
static void
_nullstream_done (struct _mu_stream *str)
{
struct _mu_nullstream *np = (struct _mu_nullstream *)str;
_nullstream_free_pattern (np);
}
static int
_nullstream_seek (struct _mu_stream *str, mu_off_t off, mu_off_t *ppos)
{
struct _mu_nullstream *np = (struct _mu_nullstream *)str;
if ((np->mode & MU_NULLSTREAM_SIZE) && off >= np->size)
return ESPIPE;
*ppos = off;
return 0;
}
static int
_nullstream_size (struct _mu_stream *str, mu_off_t *psize)
{
struct _mu_nullstream *np = (struct _mu_nullstream *)str;
*psize = (np->mode & MU_NULLSTREAM_SIZE) ? np->size : 0;
return 0;
}
static int
_nullstream_truncate (struct _mu_stream *str, mu_off_t size)
{
struct _mu_nullstream *np = (struct _mu_nullstream *)str;
np->base.size = _nullstream_size;
np->size = size;
np->mode |= MU_NULLSTREAM_SIZE;
return 0;
}
static int
_nullstream_ctl (struct _mu_stream *str, int code, int opcode, void *arg)
{
struct _mu_nullstream *np = (struct _mu_nullstream *)str;
if (code != MU_IOCTL_NULLSTREAM)
/* Only this code is supported */
return ENOSYS;
switch (opcode)
{
case MU_IOCTL_NULLSTREAM_SET_PATTERN:
if (!arg)
_nullstream_free_pattern (np);
else
{
struct mu_nullstream_pattern *pat = arg;
char *p;
p = malloc (pat->size);
if (!p)
return ENOMEM;
memcpy (p, pat->pattern, pat->size);
_nullstream_free_pattern (np);
np->pattern = p;
np->patsize = pat->size;
}
break;
case MU_IOCTL_NULLSTREAM_SET_PATCLASS:
if (!arg)
return EINVAL;
else
{
char buf[256];
int cnt = 0, i;
int class = *(int*)arg;
char *p;
for (i = 0; i < 256; i++)
{
if (mu_c_is_class (i, class))
buf[cnt++] = i;
}
p = malloc (cnt);
if (!p)
return ENOMEM;
memcpy (p, buf, cnt);
_nullstream_free_pattern (np);
np->pattern = p;
np->patsize = cnt;
}
break;
case MU_IOCTL_NULLSTREAM_SETSIZE:
if (!arg)
return EINVAL;
else
return _nullstream_truncate (str, *(mu_off_t*)arg);
break;
case MU_IOCTL_NULLSTREAM_CLRSIZE:
np->mode &= ~MU_NULLSTREAM_SIZE;
np->base.size = NULL;
break;
default:
return ENOSYS;
}
return 0;
}
int
mu_nullstream_create (mu_stream_t *pref, int flags)
{
struct _mu_nullstream *np;
np = (struct _mu_nullstream *)
_mu_stream_create (sizeof (*np),
flags | MU_STREAM_SEEK | _MU_STR_OPEN);
if (!np)
return ENOMEM;
np->base.read = _nullstream_read;
np->base.write = _nullstream_write;
np->base.seek = _nullstream_seek;
np->base.ctl = _nullstream_ctl;
np->base.truncate = _nullstream_truncate;
np->base.done = _nullstream_done;
np->pattern = "\0";
np->patsize = 1;
np->mode = MU_NULLSTREAM_PATSTAT;
*pref = (mu_stream_t) np;
mu_stream_set_buffer (*pref, mu_buffer_full, 0);
return 0;
}
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