linecon.c
2.47 KB
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/* Simple inline comment filter for GNU Mailutils.
Copyright (C) 2010 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/>. */
/* linecon - a line continuation filter.
This filter has only decode mode. It removes from the input
backslashes immediately followed by a newline, thus implementing
a familiar UNIX line-continuation facility. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <mailutils/errno.h>
#include <mailutils/filter.h>
#include <mailutils/cctype.h>
static enum mu_filter_result
_linecon_decoder (void *xd, enum mu_filter_command cmd,
struct mu_filter_io *iobuf)
{
int *escaped = xd;
const unsigned char *iptr, *iend;
char *optr, *oend;
switch (cmd)
{
case mu_filter_init:
*escaped = 0;
return mu_filter_ok;
case mu_filter_done:
return mu_filter_ok;
default:
break;
}
iptr = (const unsigned char *) iobuf->input;
iend = iptr + iobuf->isize;
optr = iobuf->output;
oend = optr + iobuf->osize;
while (iptr < iend && optr < oend)
{
int c = *iptr++;
switch (c)
{
case '\\':
*escaped = 1;
continue;
case '\n':
if (*escaped)
{
*escaped = 0;
continue;
}
*optr++ = c;
break;
default:
if (*escaped)
{
*escaped = 0;
*optr++ = '\\';
if (optr == oend)
{
iptr--;
break;
}
}
*optr++ = c;
}
}
iobuf->isize = iptr - (const unsigned char *) iobuf->input;
iobuf->osize = optr - iobuf->output;
return mu_filter_ok;
}
static int
alloc_state (void **pret, int mode MU_ARG_UNUSED, int argc, const char **argv)
{
*pret = malloc (sizeof (int));
if (!*pret)
return ENOMEM;
return 0;
}
static struct _mu_filter_record _linecon_filter = {
"LINECON",
0,
alloc_state,
NULL,
_linecon_decoder,
};
mu_filter_record_t mu_linecon_filter = &_linecon_filter;