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handler.c
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/**
* @file
* Decide how to display email content
*
* @authors
* Copyright (C) 1996-2000,2002,2010,2013 Michael R. Elkins <me@mutt.org>
*
* @copyright
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stddef.h>
#include <ctype.h>
#include <iconv.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#include "mutt/mutt.h"
#include "mutt.h"
#include "body.h"
#include "copy.h"
#include "filter.h"
#include "globals.h"
#include "keymap.h"
#include "mutt_curses.h"
#include "ncrypt/ncrypt.h"
#include "opcodes.h"
#include "options.h"
#include "protos.h"
#include "rfc1524.h"
#include "rfc3676.h"
#include "state.h"
#define BUFI_SIZE 1000
#define BUFO_SIZE 2000
typedef int (*handler_t)(struct Body *b, struct State *s);
static void print_part_line(struct State *s, struct Body *b, int n)
{
char length[5];
mutt_str_pretty_size(length, sizeof(length), b->length);
state_mark_attach(s);
char *charset = mutt_param_get(&b->parameter, "charset");
if (n != 0)
state_printf(s, _("[-- Alternative Type #%d: "), n);
else
state_printf(s, _("[-- Type: "));
state_printf(s, _("%s/%s%s%s, Encoding: %s, Size: %s --]\n"), TYPE(b),
b->subtype, charset ? "; charset=" : "", charset ? charset : "",
ENCODING(b->encoding), length);
}
static void convert_to_state(iconv_t cd, char *bufi, size_t *l, struct State *s)
{
char bufo[BUFO_SIZE];
const char *ib = NULL;
char *ob = NULL;
size_t ibl, obl;
if (!bufi)
{
if (cd != (iconv_t)(-1))
{
ob = bufo, obl = sizeof(bufo);
iconv(cd, NULL, NULL, &ob, &obl);
if (ob != bufo)
state_prefix_put(bufo, ob - bufo, s);
}
return;
}
if (cd == (iconv_t)(-1))
{
state_prefix_put(bufi, *l, s);
*l = 0;
return;
}
ib = bufi;
ibl = *l;
while (true)
{
ob = bufo, obl = sizeof(bufo);
mutt_ch_iconv(cd, &ib, &ibl, &ob, &obl, 0, "?");
if (ob == bufo)
break;
state_prefix_put(bufo, ob - bufo, s);
}
memmove(bufi, ib, ibl);
*l = ibl;
}
static void decode_xbit(struct State *s, long len, int istext, iconv_t cd)
{
if (!istext)
{
mutt_file_copy_bytes(s->fpin, s->fpout, len);
return;
}
state_set_prefix(s);
int c;
char bufi[BUFI_SIZE];
size_t l = 0;
while ((c = fgetc(s->fpin)) != EOF && len--)
{
if (c == '\r' && len)
{
const int ch = fgetc(s->fpin);
if (ch == '\n')
{
c = ch;
len--;
}
else
ungetc(ch, s->fpin);
}
bufi[l++] = c;
if (l == sizeof(bufi))
convert_to_state(cd, bufi, &l, s);
}
convert_to_state(cd, bufi, &l, s);
convert_to_state(cd, 0, 0, s);
state_reset_prefix(s);
}
static int qp_decode_triple(char *s, char *d)
{
/* soft line break */
if (*s == '=' && !(*(s + 1)))
return 1;
/* quoted-printable triple */
if (*s == '=' && isxdigit((unsigned char) *(s + 1)) &&
isxdigit((unsigned char) *(s + 2)))
{
*d = (hexval(*(s + 1)) << 4) | hexval(*(s + 2));
return 0;
}
/* something else */
return -1;
}
static void qp_decode_line(char *dest, char *src, size_t *l, int last)
{
char *d = NULL, *s = NULL;
char c = 0;
int kind = -1;
bool soft = false;
/* decode the line */
for (d = dest, s = src; *s;)
{
switch ((kind = qp_decode_triple(s, &c)))
{
case 0:
*d++ = c;
s += 3;
break; /* qp triple */
case -1:
*d++ = *s++;
break; /* single character */
case 1:
soft = true;
s++;
break; /* soft line break */
}
}
if (!soft && last == '\n')
{
/* neither \r nor \n as part of line-terminating CRLF
* may be qp-encoded, so remove \r and \n-terminate;
* see RFC2045, sect. 6.7, (1): General 8bit representation */
if (kind == 0 && c == '\r')
*(d - 1) = '\n';
else
*d++ = '\n';
}
*d = '\0';
*l = d - dest;
}
/**
* decode_quoted - Decode an attachment encoded with quoted-printable
*
* Why doesn't this overflow any buffers? First, it's guaranteed that the
* length of a line grows when you _en_-code it to quoted-printable. That
* means that we always can store the result in a buffer of at most the _same_
* size.
*
* Now, we don't special-case if the line we read with fgets() isn't
* terminated. We don't care about this, since STRING > 78, so corrupted input
* will just be corrupted a bit more. That implies that STRING+1 bytes are
* always sufficient to store the result of qp_decode_line.
*
* Finally, at soft line breaks, some part of a multibyte character may have
* been left over by convert_to_state(). This shouldn't be more than 6
* characters, so STRING + 7 should be sufficient memory to store the decoded
* data.
*
* Just to make sure that I didn't make some off-by-one error above, we just
* use STRING*2 for the target buffer's size.
*/
static void decode_quoted(struct State *s, long len, int istext, iconv_t cd)
{
char line[STRING];
char decline[2 * STRING];
size_t l = 0;
size_t l3;
if (istext)
state_set_prefix(s);
while (len > 0)
{
/*
* It's ok to use a fixed size buffer for input, even if the line turns
* out to be longer than this. Just process the line in chunks. This
* really shouldn't happen according the MIME spec, since Q-P encoded
* lines are at most 76 characters, but we should be liberal about what
* we accept.
*/
if (fgets(line, MIN((ssize_t) sizeof(line), len + 1), s->fpin) == NULL)
break;
size_t linelen = strlen(line);
len -= linelen;
/*
* inspect the last character we read so we can tell if we got the
* entire line.
*/
const int last = linelen ? line[linelen - 1] : 0;
/* chop trailing whitespace if we got the full line */
if (last == '\n')
{
while (linelen > 0 && ISSPACE(line[linelen - 1]))
linelen--;
line[linelen] = '\0';
}
/* decode and do character set conversion */
qp_decode_line(decline + l, line, &l3, last);
l += l3;
convert_to_state(cd, decline, &l, s);
}
convert_to_state(cd, 0, 0, s);
state_reset_prefix(s);
}
void mutt_decode_base64(struct State *s, size_t len, int istext, iconv_t cd)
{
char buf[5];
int ch, i;
char bufi[BUFI_SIZE];
size_t l = 0;
buf[4] = '\0';
if (istext)
state_set_prefix(s);
while (len > 0)
{
for (i = 0; i < 4 && len > 0; len--)
{
ch = fgetc(s->fpin);
if (ch == EOF)
break;
if (ch >= 0 && ch < 128 && (base64val(ch) != -1 || ch == '='))
buf[i++] = ch;
}
if (i != 4)
{
/* "i" may be zero if there is trailing whitespace, which is not an error */
if (i != 0)
mutt_debug(2, "didn't get a multiple of 4 chars.\n");
break;
}
const int c1 = base64val(buf[0]);
const int c2 = base64val(buf[1]);
ch = (c1 << 2) | (c2 >> 4);
bufi[l++] = ch;
if (buf[2] == '=')
break;
const int c3 = base64val(buf[2]);
ch = ((c2 & 0xf) << 4) | (c3 >> 2);
bufi[l++] = ch;
if (buf[3] == '=')
break;
const int c4 = base64val(buf[3]);
ch = ((c3 & 0x3) << 6) | c4;
bufi[l++] = ch;
if (l + 8 >= sizeof(bufi))
convert_to_state(cd, bufi, &l, s);
}
convert_to_state(cd, bufi, &l, s);
convert_to_state(cd, 0, 0, s);
state_reset_prefix(s);
}
static unsigned char decode_byte(char ch)
{
if (ch == 96)
return 0;
return ch - 32;
}
static void decode_uuencoded(struct State *s, long len, int istext, iconv_t cd)
{
char tmps[SHORT_STRING];
char *pt = NULL;
char bufi[BUFI_SIZE];
size_t k = 0;
if (istext)
state_set_prefix(s);
while (len > 0)
{
if ((fgets(tmps, sizeof(tmps), s->fpin)) == NULL)
return;
len -= mutt_str_strlen(tmps);
if ((mutt_str_strncmp(tmps, "begin", 5) == 0) && ISSPACE(tmps[5]))
break;
}
while (len > 0)
{
if ((fgets(tmps, sizeof(tmps), s->fpin)) == NULL)
return;
len -= mutt_str_strlen(tmps);
if (mutt_str_strncmp(tmps, "end", 3) == 0)
break;
pt = tmps;
const unsigned char linelen = decode_byte(*pt);
pt++;
for (unsigned char c = 0; c < linelen;)
{
for (char l = 2; l <= 6; l += 2)
{
char out = decode_byte(*pt) << l;
pt++;
out |= (decode_byte(*pt) >> (6 - l));
bufi[k++] = out;
c++;
if (c == linelen)
break;
}
convert_to_state(cd, bufi, &k, s);
pt++;
}
}
convert_to_state(cd, bufi, &k, s);
convert_to_state(cd, 0, 0, s);
state_reset_prefix(s);
}
/* ----------------------------------------------------------------------------
* A (not so) minimal implementation of RFC1563.
*/
#define INDENT_SIZE 4
/**
* enum RichAttribs - Rich text attributes
*/
enum RichAttribs
{
RICH_PARAM = 0,
RICH_BOLD,
RICH_UNDERLINE,
RICH_ITALIC,
RICH_NOFILL,
RICH_INDENT,
RICH_INDENT_RIGHT,
RICH_EXCERPT,
RICH_CENTER,
RICH_FLUSHLEFT,
RICH_FLUSHRIGHT,
RICH_COLOR,
RICH_LAST_TAG
};
static const struct
{
const wchar_t *tag_name;
int index;
} EnrichedTags[] = {
{ L"param", RICH_PARAM },
{ L"bold", RICH_BOLD },
{ L"italic", RICH_ITALIC },
{ L"underline", RICH_UNDERLINE },
{ L"nofill", RICH_NOFILL },
{ L"excerpt", RICH_EXCERPT },
{ L"indent", RICH_INDENT },
{ L"indentright", RICH_INDENT_RIGHT },
{ L"center", RICH_CENTER },
{ L"flushleft", RICH_FLUSHLEFT },
{ L"flushright", RICH_FLUSHRIGHT },
{ L"flushboth", RICH_FLUSHLEFT },
{ L"color", RICH_COLOR },
{ L"x-color", RICH_COLOR },
{ NULL, -1 },
};
/**
* struct EnrichedState - State of enriched-text parser
*/
struct EnrichedState
{
wchar_t *buffer;
wchar_t *line;
wchar_t *param;
size_t buf_len;
size_t line_len;
size_t line_used;
size_t line_max;
size_t indent_len;
size_t word_len;
size_t buf_used;
size_t param_used;
size_t param_len;
int tag_level[RICH_LAST_TAG];
int wrap_margin;
struct State *s;
};
static void enriched_wrap(struct EnrichedState *stte)
{
int x;
if (stte->line_len)
{
if (stte->tag_level[RICH_CENTER] || stte->tag_level[RICH_FLUSHRIGHT])
{
/* Strip trailing white space */
size_t y = stte->line_used - 1;
while (y && iswspace(stte->line[y]))
{
stte->line[y] = (wchar_t) '\0';
y--;
stte->line_used--;
stte->line_len--;
}
if (stte->tag_level[RICH_CENTER])
{
/* Strip leading whitespace */
y = 0;
while (stte->line[y] && iswspace(stte->line[y]))
y++;
if (y)
{
for (size_t z = y; z <= stte->line_used; z++)
{
stte->line[z - y] = stte->line[z];
}
stte->line_len -= y;
stte->line_used -= y;
}
}
}
const int extra = stte->wrap_margin - stte->line_len - stte->indent_len -
(stte->tag_level[RICH_INDENT_RIGHT] * INDENT_SIZE);
if (extra > 0)
{
if (stte->tag_level[RICH_CENTER])
{
x = extra / 2;
while (x)
{
state_putc(' ', stte->s);
x--;
}
}
else if (stte->tag_level[RICH_FLUSHRIGHT])
{
x = extra - 1;
while (x)
{
state_putc(' ', stte->s);
x--;
}
}
}
state_putws((const wchar_t *) stte->line, stte->s);
}
state_putc('\n', stte->s);
stte->line[0] = (wchar_t) '\0';
stte->line_len = 0;
stte->line_used = 0;
stte->indent_len = 0;
if (stte->s->prefix)
{
state_puts(stte->s->prefix, stte->s);
stte->indent_len += mutt_str_strlen(stte->s->prefix);
}
if (stte->tag_level[RICH_EXCERPT])
{
x = stte->tag_level[RICH_EXCERPT];
while (x)
{
if (stte->s->prefix)
{
state_puts(stte->s->prefix, stte->s);
stte->indent_len += mutt_str_strlen(stte->s->prefix);
}
else
{
state_puts("> ", stte->s);
stte->indent_len += mutt_str_strlen("> ");
}
x--;
}
}
else
stte->indent_len = 0;
if (stte->tag_level[RICH_INDENT])
{
x = stte->tag_level[RICH_INDENT] * INDENT_SIZE;
stte->indent_len += x;
while (x)
{
state_putc(' ', stte->s);
x--;
}
}
}
static void enriched_flush(struct EnrichedState *stte, int wrap)
{
if (!stte->tag_level[RICH_NOFILL] &&
(stte->line_len + stte->word_len >
(stte->wrap_margin - (stte->tag_level[RICH_INDENT_RIGHT] * INDENT_SIZE) - stte->indent_len)))
enriched_wrap(stte);
if (stte->buf_used)
{
stte->buffer[stte->buf_used] = (wchar_t) '\0';
stte->line_used += stte->buf_used;
if (stte->line_used > stte->line_max)
{
stte->line_max = stte->line_used;
mutt_mem_realloc(&stte->line, (stte->line_max + 1) * sizeof(wchar_t));
}
wcscat(stte->line, stte->buffer);
stte->line_len += stte->word_len;
stte->word_len = 0;
stte->buf_used = 0;
}
if (wrap)
enriched_wrap(stte);
fflush(stte->s->fpout);
}
static void enriched_putwc(wchar_t c, struct EnrichedState *stte)
{
if (stte->tag_level[RICH_PARAM])
{
if (stte->tag_level[RICH_COLOR])
{
if (stte->param_used + 1 >= stte->param_len)
mutt_mem_realloc(&stte->param, (stte->param_len += STRING) * sizeof(wchar_t));
stte->param[stte->param_used++] = c;
}
return; /* nothing to do */
}
/* see if more space is needed (plus extra for possible rich characters) */
if (stte->buf_len < stte->buf_used + 3)
{
stte->buf_len += LONG_STRING;
mutt_mem_realloc(&stte->buffer, (stte->buf_len + 1) * sizeof(wchar_t));
}
if ((!stte->tag_level[RICH_NOFILL] && iswspace(c)) || c == (wchar_t) '\0')
{
if (c == (wchar_t) '\t')
stte->word_len += 8 - (stte->line_len + stte->word_len) % 8;
else
stte->word_len++;
stte->buffer[stte->buf_used++] = c;
enriched_flush(stte, 0);
}
else
{
if (stte->s->flags & MUTT_DISPLAY)
{
if (stte->tag_level[RICH_BOLD])
{
stte->buffer[stte->buf_used++] = c;
stte->buffer[stte->buf_used++] = (wchar_t) '\010';
stte->buffer[stte->buf_used++] = c;
}
else if (stte->tag_level[RICH_UNDERLINE])
{
stte->buffer[stte->buf_used++] = '_';
stte->buffer[stte->buf_used++] = (wchar_t) '\010';
stte->buffer[stte->buf_used++] = c;
}
else if (stte->tag_level[RICH_ITALIC])
{
stte->buffer[stte->buf_used++] = c;
stte->buffer[stte->buf_used++] = (wchar_t) '\010';
stte->buffer[stte->buf_used++] = '_';
}
else
{
stte->buffer[stte->buf_used++] = c;
}
}
else
{
stte->buffer[stte->buf_used++] = c;
}
stte->word_len++;
}
}
static void enriched_puts(const char *s, struct EnrichedState *stte)
{
const char *c = NULL;
if (stte->buf_len < stte->buf_used + mutt_str_strlen(s))
{
stte->buf_len += LONG_STRING;
mutt_mem_realloc(&stte->buffer, (stte->buf_len + 1) * sizeof(wchar_t));
}
c = s;
while (*c)
{
stte->buffer[stte->buf_used++] = (wchar_t) *c;
c++;
}
}
static void enriched_set_flags(const wchar_t *tag, struct EnrichedState *stte)
{
const wchar_t *tagptr = tag;
int i, j;
if (*tagptr == (wchar_t) '/')
tagptr++;
for (i = 0, j = -1; EnrichedTags[i].tag_name; i++)
{
if (wcscasecmp(EnrichedTags[i].tag_name, tagptr) == 0)
{
j = EnrichedTags[i].index;
break;
}
}
if (j != -1)
{
if (j == RICH_CENTER || j == RICH_FLUSHLEFT || j == RICH_FLUSHRIGHT)
enriched_flush(stte, 1);
if (*tag == (wchar_t) '/')
{
if (stte->tag_level[j]) /* make sure not to go negative */
stte->tag_level[j]--;
if ((stte->s->flags & MUTT_DISPLAY) && j == RICH_PARAM && stte->tag_level[RICH_COLOR])
{
stte->param[stte->param_used] = (wchar_t) '\0';
if (wcscasecmp(L"black", stte->param) == 0)
{
enriched_puts("\033[30m", stte);
}
else if (wcscasecmp(L"red", stte->param) == 0)
{
enriched_puts("\033[31m", stte);
}
else if (wcscasecmp(L"green", stte->param) == 0)
{
enriched_puts("\033[32m", stte);
}
else if (wcscasecmp(L"yellow", stte->param) == 0)
{
enriched_puts("\033[33m", stte);
}
else if (wcscasecmp(L"blue", stte->param) == 0)
{
enriched_puts("\033[34m", stte);
}
else if (wcscasecmp(L"magenta", stte->param) == 0)
{
enriched_puts("\033[35m", stte);
}
else if (wcscasecmp(L"cyan", stte->param) == 0)
{
enriched_puts("\033[36m", stte);
}
else if (wcscasecmp(L"white", stte->param) == 0)
{
enriched_puts("\033[37m", stte);
}
}
if ((stte->s->flags & MUTT_DISPLAY) && j == RICH_COLOR)
{
enriched_puts("\033[0m", stte);
}
/* flush parameter buffer when closing the tag */
if (j == RICH_PARAM)
{
stte->param_used = 0;
stte->param[0] = (wchar_t) '\0';
}
}
else
stte->tag_level[j]++;
if (j == RICH_EXCERPT)
enriched_flush(stte, 1);
}
}
static int text_enriched_handler(struct Body *a, struct State *s)
{
enum
{
TEXT,
LANGLE,
TAG,
BOGUS_TAG,
NEWLINE,
ST_EOF,
DONE
} state = TEXT;
long bytes = a->length;
struct EnrichedState stte;
wchar_t wc = 0;
int tag_len = 0;
wchar_t tag[LONG_STRING + 1];
memset(&stte, 0, sizeof(stte));
stte.s = s;
stte.wrap_margin =
((s->flags & MUTT_DISPLAY) ?
(MuttIndexWindow->cols - 4) :
((MuttIndexWindow->cols - 4) < 72) ? (MuttIndexWindow->cols - 4) : 72);
stte.line_max = stte.wrap_margin * 4;
stte.line = mutt_mem_calloc(1, (stte.line_max + 1) * sizeof(wchar_t));
stte.param = mutt_mem_calloc(1, (STRING) * sizeof(wchar_t));
stte.param_len = STRING;
stte.param_used = 0;
if (s->prefix)
{
state_puts(s->prefix, s);
stte.indent_len += mutt_str_strlen(s->prefix);
}
while (state != DONE)
{
if (state != ST_EOF)
{
if (!bytes || (wc = fgetwc(s->fpin)) == WEOF)
state = ST_EOF;
else
bytes--;
}
switch (state)
{
case TEXT:
switch (wc)
{
case '<':
state = LANGLE;
break;
case '\n':
if (stte.tag_level[RICH_NOFILL])
{
enriched_flush(&stte, 1);
}
else
{
enriched_putwc((wchar_t) ' ', &stte);
state = NEWLINE;
}
break;
default:
enriched_putwc(wc, &stte);
}
break;
case LANGLE:
if (wc == (wchar_t) '<')
{
enriched_putwc(wc, &stte);
state = TEXT;
break;
}
else
{
tag_len = 0;
state = TAG;
}
/* Yes, (it wasn't a <<, so this char is first in TAG) */
/* fallthrough */
case TAG:
if (wc == (wchar_t) '>')
{
tag[tag_len] = (wchar_t) '\0';
enriched_set_flags(tag, &stte);
state = TEXT;
}
else if (tag_len < LONG_STRING) /* ignore overly long tags */
tag[tag_len++] = wc;
else
state = BOGUS_TAG;
break;
case BOGUS_TAG:
if (wc == (wchar_t) '>')
state = TEXT;
break;
case NEWLINE:
if (wc == (wchar_t) '\n')
enriched_flush(&stte, 1);
else
{
ungetwc(wc, s->fpin);
bytes++;
state = TEXT;
}
break;
case ST_EOF:
enriched_putwc((wchar_t) '\0', &stte);
enriched_flush(&stte, 1);
state = DONE;
break;
case DONE: /* not reached, but gcc complains if this is absent */
break;
}
}
state_putc('\n', s); /* add a final newline */
FREE(&(stte.buffer));
FREE(&(stte.line));
FREE(&(stte.param));
return 0;
}
/**
* is_mmnoask - for compatibility with metamail
*/
static int is_mmnoask(const char *buf)
{
char *p = NULL;
const char *val = NULL;
char tmp[LONG_STRING], *q = NULL;
val = mutt_str_getenv("MM_NOASK");
if (val)
{
if (mutt_str_strcmp(val, "1") == 0)
return 1;
mutt_str_strfcpy(tmp, val, sizeof(tmp));
p = tmp;
while ((p = strtok(p, ",")) != NULL)
{
q = strrchr(p, '/');
if (q)
{
if (*(q + 1) == '*')
{
if (mutt_str_strncasecmp(buf, p, q - p) == 0)
return 1;
}
else
{
if (mutt_str_strcasecmp(buf, p) == 0)
return 1;
}
}
else
{
const int lng = mutt_str_strlen(p);
if (buf[lng] == '/' && (mutt_str_strncasecmp(buf, p, lng) == 0))
return 1;
}
p = NULL;
}
}
return 0;
}
/**
* is_autoview - Should email body be filtered by mailcap
* @param b Email body
* @retval 1 body part should be filtered by a mailcap entry prior to viewing inline
* @retval 0 otherwise
*/
static int is_autoview(struct Body *b)
{
char type[SHORT_STRING];
int is_av = 0;
snprintf(type, sizeof(type), "%s/%s", TYPE(b), b->subtype);
if (ImplicitAutoview)
{
/* $implicit_autoview is essentially the same as "auto_view *" */
is_av = 1;
}
else
{
/* determine if this type is on the user's auto_view list */
mutt_check_lookup_list(b, type, sizeof(type));
struct ListNode *np;
STAILQ_FOREACH(np, &AutoViewList, entries)
{
int i = mutt_str_strlen(np->data) - 1;
if ((i > 0 && np->data[i - 1] == '/' && np->data[i] == '*' &&
(mutt_str_strncasecmp(type, np->data, i) == 0)) ||
(mutt_str_strcasecmp(type, np->data) == 0))
{
is_av = 1;
break;
}
}
if (is_mmnoask(type))
is_av = 1;
}
/* determine if there is a mailcap entry suitable for auto_view
*
* WARNING: type is altered by this call as a result of `mime_lookup' support */
if (is_av)
return rfc1524_mailcap_lookup(b, type, NULL, MUTT_AUTOVIEW);
return 0;
}
#define TXTHTML 1
#define TXTPLAIN 2
#define TXTENRICHED 3