/*
* Copyright (C) 2005 Andreas Krennmair <ak@synflood.at>
* Copyright (C) 2005 Peter J. Holzer <hjp@hjp.net>
* Copyright (C) 2005-2009 Rocco Rutte <pdmef@gmx.net>
* Copyright (C) 2010 Michael R. Elkins <me@mutt.org>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/* This file was originally part of mutt-ng */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include "mutt.h"
#include "mutt_curses.h"
#include "ascii.h"
#include "lib.h"
#include "mime.h"
#define FLOWED_MAX 72
typedef struct flowed_state
{
size_t width;
size_t spaces;
int delsp;
} flowed_state_t;
static int get_quote_level (const char *line)
{
int quoted = 0;
char *p = (char *) line;
while (p && *p == '>')
{
quoted++;
p++;
}
return quoted;
}
/* Determines whether to add spacing between/after each quote level:
* >>>foo
* becomes
* > > > foo
*/
static int space_quotes (STATE *s)
{
/* Allow quote spacing in the pager even for OPTTEXTFLOWED,
* but obviously not when replying.
*/
if (option (OPTTEXTFLOWED) && (s->flags & MUTT_REPLYING))
return 0;
return option (OPTREFLOWSPACEQUOTES);
}
/* Determines whether to add a trailing space to quotes:
* >>> foo
* as opposed to
* >>>foo
*/
static int add_quote_suffix (STATE *s, int ql)
{
if (s->flags & MUTT_REPLYING)
return 0;
if (space_quotes (s))
return 0;
if (!ql && !s->prefix)
return 0;
/* The prefix will add its own space */
if (!option (OPTTEXTFLOWED) && !ql && s->prefix)
return 0;
return 1;
}
static size_t print_indent (int ql, STATE *s, int add_suffix)
{
int i;
size_t wid = 0;
if (s->prefix)
{
/* use given prefix only for format=fixed replies to format=flowed,
* for format=flowed replies to format=flowed, use '>' indentation
*/
if (option (OPTTEXTFLOWED))
ql++;
else
{
state_puts (s->prefix, s);
wid = mutt_strwidth (s->prefix);
}
}
for (i = 0; i < ql; i++)
{
state_putc ('>', s);
if (space_quotes (s) )
state_putc (' ', s);
}
if (add_suffix)
state_putc (' ', s);
if (space_quotes (s))
ql *= 2;
return ql + add_suffix + wid;
}
static void flush_par (STATE *s, flowed_state_t *fst)
{
if (fst->width > 0)
{
state_putc ('\n', s);
fst->width = 0;
}
fst->spaces = 0;
}
/* Calculate the paragraph width based upon the current quote level. The start
* of a quoted line will be ">>> ", so we need to subtract the space required
* for the prefix from the terminal width. */
static int quote_width (STATE *s, int ql)
{
int width = mutt_window_wrap_cols (MuttIndexWindow, ReflowWrap);
if (option(OPTTEXTFLOWED) && (s->flags & MUTT_REPLYING))
{
/* When replying, force a wrap at FLOWED_MAX to comply with RFC3676
* guidelines */
if (width > FLOWED_MAX)
width = FLOWED_MAX;
++ql; /* When replying, we will add an additional quote level */
}
/* adjust the paragraph width subtracting the number of prefix chars */
width -= space_quotes (s) ? ql*2 : ql;
/* When displaying (not replying), there may be a space between the prefix
* string and the paragraph */
if (add_quote_suffix (s, ql))
--width;
/* failsafe for really long quotes */
if (width <= 0)
width = FLOWED_MAX; /* arbitrary, since the line will wrap */
return width;
}
static void print_flowed_line (char *line, STATE *s, int ql,
flowed_state_t *fst, int term)
{
size_t width, w, words = 0;
char *p;
char last;
if (!line || !*line)
{
/* flush current paragraph (if any) first */
flush_par (s, fst);
print_indent (ql, s, 0);
state_putc ('\n', s);
return;
}
width = quote_width (s, ql);
last = line[mutt_strlen (line) - 1];
dprint (4, (debugfile, "f=f: line [%s], width = %ld, spaces = %d\n",
NONULL(line), (long)width, fst->spaces));
for (p = (char *)line, words = 0; (p = strsep (&line, " ")) != NULL ; )
{
dprint(4,(debugfile,"f=f: word [%s], width: %d, remaining = [%s]\n",
p, fst->width, line));
/* remember number of spaces */
if (!*p)
{
dprint(4,(debugfile,"f=f: additional space\n"));
fst->spaces++;
continue;
}
/* there's exactly one space prior to every but the first word */
if (words)
fst->spaces++;
w = mutt_strwidth (p);
/* see if we need to break the line but make sure the first
word is put on the line regardless;
if for DelSp=yes only one trailing space is used, we probably
have a long word that we should break within (we leave that
up to the pager or user) */
if (!(!fst->spaces && fst->delsp && last != ' ') &&
w < width && w + fst->width + fst->spaces > width)
{
dprint(4,(debugfile,"f=f: break line at %d, %d spaces left\n",
fst->width, fst->spaces));
/* only honor trailing spaces for format=flowed replies */
if (option(OPTTEXTFLOWED))
for ( ; fst->spaces; fst->spaces--)
state_putc (' ', s);
state_putc ('\n', s);
fst->width = 0;
fst->spaces = 0;
words = 0;
}
if (!words && !fst->width)
fst->width = print_indent (ql, s, add_quote_suffix (s, ql));
fst->width += w + fst->spaces;
for ( ; fst->spaces; fst->spaces--)
state_putc (' ', s);
state_puts (p, s);
words++;
}
if (term)
flush_par (s, fst);
}
static void print_fixed_line (const char *line, STATE *s, int ql,
flowed_state_t *fst)
{
print_indent (ql, s, add_quote_suffix (s, ql));
if (line && *line)
state_puts (line, s);
state_putc ('\n', s);
fst->width = 0;
fst->spaces = 0;
}
int rfc3676_handler (BODY * a, STATE * s)
{
char *buf = NULL, *t = NULL;
unsigned int quotelevel = 0, newql = 0, sigsep = 0;
int buf_off = 0, delsp = 0, fixed = 0;
size_t buf_len = 0, sz = 0;
flowed_state_t fst;
memset (&fst, 0, sizeof (fst));
/* respect DelSp of RfC3676 only with f=f parts */
if ((t = (char *) mutt_get_parameter ("delsp", a->parameter)))
{
delsp = mutt_strlen (t) == 3 && ascii_strncasecmp (t, "yes", 3) == 0;
t = NULL;
fst.delsp = 1;
}
dprint (4, (debugfile, "f=f: DelSp: %s\n", delsp ? "yes" : "no"));
while ((buf = mutt_read_line (buf, &sz, s->fpin, NULL, 0)))
{
buf_len = mutt_strlen (buf);
newql = get_quote_level (buf);
/* end flowed paragraph (if we're within one) if quoting level
* changes (should not but can happen, see RFC 3676, sec. 4.5.)
*/
if (newql != quotelevel)
flush_par (s, &fst);
quotelevel = newql;
buf_off = newql;
/* respect sender's space-stuffing by removing one leading space */
if (buf[buf_off] == ' ')
buf_off++;
/* test for signature separator */
sigsep = ascii_strcmp (buf + buf_off, "-- ") == 0;
/* a fixed line either has no trailing space or is the
* signature separator */
fixed = buf_len == buf_off || buf[buf_len - 1] != ' ' || sigsep;
/* print fixed-and-standalone, fixed-and-empty and sigsep lines as
* fixed lines */
if ((fixed && (!fst.width || !buf_len)) || sigsep)
{
/* if we're within a flowed paragraph, terminate it */
flush_par (s, &fst);
print_fixed_line (buf + buf_off, s, quotelevel, &fst);
continue;
}
/* for DelSp=yes, we need to strip one SP prior to CRLF on flowed lines */
if (delsp && !fixed)
buf[--buf_len] = '\0';
print_flowed_line (buf + buf_off, s, quotelevel, &fst, fixed);
}
flush_par (s, &fst);
FREE (&buf);
return (0);
}
/*
* This routine does RfC3676 space stuffing since it's a MUST.
* Space stuffing means that we have to add leading spaces to
* certain lines:
* - lines starting with a space
* - lines starting with 'From '
*
* Care is taken to preserve the hdr->content->filename, as
* mutt -i -E can directly edit a passed in filename.
*/
static void rfc3676_space_stuff (const char *filename, int unstuff)
{
FILE *in = NULL, *out = NULL;
char *buf = NULL;
size_t blen = 0;
BUFFER *tmpfile = NULL;
tmpfile = mutt_buffer_pool_get ();
if ((in = safe_fopen (filename, "r")) == NULL)
goto bail;
mutt_buffer_mktemp (tmpfile);
if ((out = safe_fopen (mutt_b2s (tmpfile), "w+")) == NULL)
goto bail;
while ((buf = mutt_read_line (buf, &blen, in, NULL, 0)) != NULL)
{
if (unstuff)
{
if (buf[0] == ' ')
fputs (buf + 1, out);
else
fputs (buf, out);
}
else
{
if (ascii_strncmp ("From ", buf, 5) == 0 || buf[0] == ' ')
fputc (' ', out);
fputs (buf, out);
}
fputc ('\n', out);
}
FREE (&buf);
safe_fclose (&in);
safe_fclose (&out);
mutt_set_mtime (filename, mutt_b2s (tmpfile));
if ((in = safe_fopen (mutt_b2s (tmpfile), "r")) == NULL)
goto bail;
if ((truncate (filename, 0) == -1) ||
((out = safe_fopen (filename, "a")) == NULL))
{
mutt_perror (filename);
goto bail;
}
mutt_copy_stream (in, out);
safe_fclose (&in);
safe_fclose (&out);
mutt_set_mtime (mutt_b2s (tmpfile), filename);
unlink (mutt_b2s (tmpfile));
mutt_buffer_pool_release (&tmpfile);
return;
bail:
safe_fclose (&in);
safe_fclose (&out);
mutt_buffer_pool_release (&tmpfile);
}
int mutt_rfc3676_is_format_flowed (BODY *b)
{
if (b &&
b->type == TYPETEXT &&
!ascii_strcasecmp ("plain", b->subtype))
{
const char *format = mutt_get_parameter ("format", b->parameter);
if (!ascii_strcasecmp ("flowed", format))
return 1;
}
return 0;
}
/* Note: we don't check the option OPTTEXTFLOWED because we want to
* stuff based the actual content type. The option only decides
* whether to *set* format=flowed on new messages.
*/
void mutt_rfc3676_space_stuff (HEADER *hdr)
{
if (!hdr || !hdr->content || !hdr->content->filename)
return;
if (mutt_rfc3676_is_format_flowed (hdr->content))
rfc3676_space_stuff (hdr->content->filename, 0);
}
void mutt_rfc3676_space_unstuff (HEADER *hdr)
{
if (!hdr || !hdr->content || !hdr->content->filename)
return;
if (mutt_rfc3676_is_format_flowed (hdr->content))
rfc3676_space_stuff (hdr->content->filename, 1);
}
/* This routine is used when saving/piping/viewing rfc3676 attachments.
*
* BODY *b is optional, but if provided it will verify it is
* format-flowed.
*
* The filename, not b->filename or b->fp will be unstuffed.
*/
void mutt_rfc3676_space_unstuff_attachment (BODY *b, const char *filename)
{
if (!filename)
return;
if (b && !mutt_rfc3676_is_format_flowed (b))
return;
rfc3676_space_stuff (filename, 1);
}
/* This routine is used when filtering rfc3676 attachments.
*
* BODY *b is optional, but if provided it will verify it is
* format-flowed.
*
* The filename, not b->filename or b->fp will be stuffed.
*/
void mutt_rfc3676_space_stuff_attachment (BODY *b, const char *filename)
{
if (!filename)
return;
if (b && !mutt_rfc3676_is_format_flowed (b))
return;
rfc3676_space_stuff (filename, 0);
}