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/* Simple inline comment filter for GNU Mailutils.
Copyright (C) 2010-2012 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.
The following option is accepted:
-i STR Emit line number information after each contiguous sequence
of joined lines. STR supplies "information starter" -- a
sequence of characters which is output before the actual line
number.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <mailutils/errno.h>
#include <mailutils/filter.h>
#include <mailutils/cctype.h>
#include <mailutils/io.h>
#define LINECON_LINE_INFO 0x01 /* Emit line number information */
#define LINECON_LINE_INFO_STATIC 0x02 /* Line info starter is in static
storage */
#define LINECON_CONTINUATION 0x04 /* Line continuation in progress */
enum linecon_state
{
linecon_init, /* Initial state */
linecon_escape, /* An escape was seen */
linecon_rollback /* Rollback in progress */
};
struct linecon_data
{
int flags; /* Mode flags */
enum linecon_state state; /* Current state */
char *line_info_starter; /* Starter for line number info lines */
unsigned long line_number; /* Current line number */
char sbuf[2]; /* Static buffer for single-character starters */
char *buf; /* Rollback buffer ... */
size_t size; /* and its size */
size_t level; /* Number of characters stored in buf. */
size_t replay; /* Index of the next-to-be-replayed character
from buf */
};
static enum mu_filter_result
_linecon_decoder (void *xd, enum mu_filter_command cmd,
struct mu_filter_io *iobuf)
{
struct linecon_data *pd = xd;
const unsigned char *iptr, *iend;
char *optr, *oend;
switch (cmd)
{
case mu_filter_init:
pd->state = linecon_init;
return mu_filter_ok;
case mu_filter_done:
if ((pd->flags & LINECON_LINE_INFO) &&
!(pd->flags & LINECON_LINE_INFO_STATIC))
free (pd->line_info_starter);
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)
{
switch (pd->state)
{
case linecon_init:
switch (*iptr)
{
case '\\':
iptr++;
pd->state = linecon_escape;
continue;
case '\n':
pd->line_number++;
if (pd->flags & LINECON_CONTINUATION)
{
pd->flags &= ~LINECON_CONTINUATION;
mu_asnprintf (&pd->buf, &pd->size, "%s %lu\n",
pd->line_info_starter,
pd->line_number);
pd->level = strlen (pd->buf);
pd->replay = 0;
pd->state = linecon_rollback;
}
/* fall through */
default:
*optr++ = *iptr++;
break;
}
break;
case linecon_escape:
if (*iptr == '\n')
{
pd->line_number++;
iptr++;
pd->state = linecon_init;
if (pd->flags & LINECON_LINE_INFO)
pd->flags |= LINECON_CONTINUATION;
continue;
}
else
{
pd->state = linecon_init;
*optr++ = '\\';
if (optr == oend)
break;
*optr++ = *iptr++;
}
break;
case linecon_rollback:
*optr++ = pd->buf[pd->replay++];
if (pd->replay == pd->level)
pd->state = linecon_init;
}
}
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)
{
int i;
struct linecon_data *pd = malloc (sizeof (pd[0]));
const char *line_info;
if (!pd)
return ENOMEM;
pd->flags = 0;
pd->buf = NULL;
pd->size = pd->level = pd->replay = 0;
pd->line_number = 1;
for (i = 1; i < argc; i++)
{
if (argv[i][0] == '-')
{
switch (argv[i][1])
{
case 'i':
pd->flags |= LINECON_LINE_INFO;
if (i + 1 == argc)
return MU_ERR_PARSE;
line_info = argv[++i];
break;
default:
free (pd);
return MU_ERR_PARSE;
}
}
}
if (pd->flags & LINECON_LINE_INFO)
{
if (line_info[1])
{
pd->line_info_starter = strdup (line_info);
if (!pd->line_info_starter)
{
free (pd);
return ENOMEM;
}
}
else
{
pd->sbuf[0] = line_info[0];
pd->sbuf[1] = 0;
pd->line_info_starter = pd->sbuf;
pd->flags |= LINECON_LINE_INFO_STATIC;
}
}
*pret = pd;
return 0;
}
static struct _mu_filter_record _linecon_filter = {
"LINECON",
alloc_state,
NULL,
_linecon_decoder,
};
mu_filter_record_t mu_linecon_filter = &_linecon_filter;
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