init.c 54.8 KB
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/*
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 * Copyright (C) 1996-2002 Michael R. Elkins <[email protected]>
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 * 
 *     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
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 *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
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 */ 

#include "mutt.h"
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#include "mapping.h"
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#include "mutt_curses.h"
#include "mutt_regex.h"
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#include "history.h"
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#include "keymap.h"
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#include "mbyte.h"
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#include "charset.h"
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#include "mutt_crypt.h"
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#include "mutt_idna.h"
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#if defined(USE_SSL) || defined(USE_NSS) || defined(USE_GNUTLS)
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#include "mutt_ssl.h"
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#endif


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#include "mx.h"
#include "init.h"
#include "mailbox.h"

#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/utsname.h>
#include <errno.h>
#include <sys/wait.h>

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void toggle_quadoption (int opt)
{
  int n = opt/4;
  int b = (opt % 4) * 2;

  QuadOptions[n] ^= (1 << b);
}
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void set_quadoption (int opt, int flag)
{
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  int n = opt/4;
  int b = (opt % 4) * 2;

  QuadOptions[n] &= ~(0x3 << b);
  QuadOptions[n] |= (flag & 0x3) << b;
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}

int quadoption (int opt)
{
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  int n = opt/4;
  int b = (opt % 4) * 2;

  return (QuadOptions[n] >> b) & 0x3;
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}

int query_quadoption (int opt, const char *prompt)
{
  int v = quadoption (opt);

  switch (v)
  {
    case M_YES:
    case M_NO:
      return (v);

    default:
      v = mutt_yesorno (prompt, (v == M_ASKYES));
      CLEARLINE (LINES - 1);
      return (v);
  }

  /* not reached */
}

/* given the variable ``s'', return the index into the rc_vars array which
   matches, or -1 if the variable is not found.  */
int mutt_option_index (char *s)
{
  int i;

  for (i = 0; MuttVars[i].option; i++)
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    if (mutt_strcmp (s, MuttVars[i].option) == 0)
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      return (MuttVars[i].type == DT_SYN ?  mutt_option_index ((char *) MuttVars[i].data) : i);
  return (-1);
}

int mutt_extract_token (BUFFER *dest, BUFFER *tok, int flags)
{
  char		ch;
  char		qc = 0; /* quote char */
  char		*pc;

  /* reset the destination pointer to the beginning of the buffer */
  dest->dptr = dest->data;

  SKIPWS (tok->dptr);
  while ((ch = *tok->dptr))
  {
    if (!qc)
    {
      if ((ISSPACE (ch) && !(flags & M_TOKEN_SPACE)) ||
	  (ch == '#' && !(flags & M_TOKEN_COMMENT)) ||
	  (ch == '=' && (flags & M_TOKEN_EQUAL)) ||
	  (ch == ';' && !(flags & M_TOKEN_SEMICOLON)) ||
	  ((flags & M_TOKEN_PATTERN) && strchr ("~!|", ch)))
	break;
    }

    tok->dptr++;

    if (ch == qc)
      qc = 0; /* end of quote */
    else if (!qc && (ch == '\'' || ch == '"') && !(flags & M_TOKEN_QUOTE))
      qc = ch;
    else if (ch == '\\' && qc != '\'')
    {
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	if (!*tok->dptr)
	    return -1; /* premature end of token */
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      switch (ch = *tok->dptr++)
      {
	case 'c':
	case 'C':
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	    if (!*tok->dptr)
		return -1; /* premature end of token */
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	  mutt_buffer_addch (dest, (toupper ((unsigned char) *tok->dptr)
                                    - '@') & 0x7f);
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	  tok->dptr++;
	  break;
	case 'r':
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	  mutt_buffer_addch (dest, '\r');
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	  break;
	case 'n':
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	  mutt_buffer_addch (dest, '\n');
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	  break;
	case 't':
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	  mutt_buffer_addch (dest, '\t');
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	  break;
	case 'f':
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	  mutt_buffer_addch (dest, '\f');
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	  break;
	case 'e':
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	  mutt_buffer_addch (dest, '\033');
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	  break;
	default:
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	  if (isdigit ((unsigned char) ch) &&
	      isdigit ((unsigned char) *tok->dptr) &&
	      isdigit ((unsigned char) *(tok->dptr + 1)))
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	  {

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	    mutt_buffer_addch (dest, (ch << 6) + (*tok->dptr << 3) + *(tok->dptr + 1) - 3504);
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	    tok->dptr += 2;
	  }
	  else
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	    mutt_buffer_addch (dest, ch);
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      }
    }
    else if (ch == '^' && (flags & M_TOKEN_CONDENSE))
    {
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	if (!*tok->dptr)
	    return -1; /* premature end of token */
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      ch = *tok->dptr++;
      if (ch == '^')
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	mutt_buffer_addch (dest, ch);
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      else if (ch == '[')
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	mutt_buffer_addch (dest, '\033');
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      else if (isalpha ((unsigned char) ch))
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	mutt_buffer_addch (dest, toupper ((unsigned char) ch) - '@');
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      else
      {
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	mutt_buffer_addch (dest, '^');
	mutt_buffer_addch (dest, ch);
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      }
    }
    else if (ch == '`' && (!qc || qc == '"'))
    {
      FILE	*fp;
      pid_t	pid;
      char	*cmd, *ptr;
      size_t	expnlen;
      BUFFER	expn;
      int	line = 0;

      pc = tok->dptr;
      do {
	if ((pc = strpbrk (pc, "\\`")))
	{
	  /* skip any quoted chars */
	  if (*pc == '\\')
	    pc += 2;
	}
      } while (pc && *pc != '`');
      if (!pc)
      {
	dprint (1, (debugfile, "mutt_get_token: mismatched backtics\n"));
	return (-1);
      }
      cmd = mutt_substrdup (tok->dptr, pc);
      if ((pid = mutt_create_filter (cmd, NULL, &fp, NULL)) < 0)
      {
	dprint (1, (debugfile, "mutt_get_token: unable to fork command: %s", cmd));
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	FREE (&cmd);
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	return (-1);
      }
      FREE (&cmd);

      tok->dptr = pc + 1;

      /* read line */
      memset (&expn, 0, sizeof (expn));
      expn.data = mutt_read_line (NULL, &expn.dsize, fp, &line);
      fclose (fp);
      mutt_wait_filter (pid);

      /* if we got output, make a new string consiting of the shell ouptput
	 plus whatever else was left on the original line */
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      /* BUT: If this is inside a quoted string, directly add output to 
       * the token */
      if (expn.data && qc)
      {
	mutt_buffer_addstr (dest, expn.data);
	FREE (&expn.data);
      }
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      else if (expn.data)
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      {
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	expnlen = mutt_strlen (expn.data);
	tok->dsize = expnlen + mutt_strlen (tok->dptr) + 1;
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	ptr = safe_malloc (tok->dsize);
	memcpy (ptr, expn.data, expnlen);
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	strcpy (ptr + expnlen, tok->dptr);	/* __STRCPY_CHECKED__ */
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	if (tok->destroy)
	  FREE (&tok->data);
	tok->data = ptr;
	tok->dptr = ptr;
	tok->destroy = 1; /* mark that the caller should destroy this data */
	ptr = NULL;
	FREE (&expn.data);
      }
    }
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    else if (ch == '$' && (!qc || qc == '"') && (*tok->dptr == '{' || isalpha ((unsigned char) *tok->dptr)))
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    {
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      char *env = NULL, *var = NULL;
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      if (*tok->dptr == '{')
      {
	tok->dptr++;
	if ((pc = strchr (tok->dptr, '}')))
	{
	  var = mutt_substrdup (tok->dptr, pc);
	  tok->dptr = pc + 1;
	}
      }
      else
      {
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	for (pc = tok->dptr; isalpha ((unsigned char) *pc) || *pc == '_'; pc++)
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	  ;
	var = mutt_substrdup (tok->dptr, pc);
	tok->dptr = pc;
      }
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      if (var && (env = getenv (var)))
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	mutt_buffer_addstr (dest, env);
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      FREE (&var);
    }
    else
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      mutt_buffer_addch (dest, ch);
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  }
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  mutt_buffer_addch (dest, 0); /* terminate the string */
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  SKIPWS (tok->dptr);
  return 0;
}

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static void add_to_list (LIST **list, const char *str)
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{
  LIST *t, *last = NULL;

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  /* don't add a NULL or empty string to the list */
  if (!str || *str == '\0')
    return;

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  /* check to make sure the item is not already on this list */
  for (last = *list; last; last = last->next)
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  {
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    if (ascii_strcasecmp (str, last->data) == 0)
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    {
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      /* already on the list, so just ignore it */
      last = NULL;
      break;
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    }
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    if (!last->next)
      break;
  }
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  if (!*list || last)
  {
    t = (LIST *) safe_calloc (1, sizeof (LIST));
    t->data = safe_strdup (str);
    if (last)
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    {
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      last->next = t;
      last = last->next;
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    }
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    else
      *list = last = t;
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  }
}

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static int add_to_rx_list (RX_LIST **list, const char *s, int flags, BUFFER *err)
{
  RX_LIST *t, *last = NULL;
  REGEXP *rx;

  if (!s || !*s)
    return 0;

  if (!(rx = mutt_compile_regexp (s, flags)))
  {
    snprintf (err->data, err->dsize, "Bad regexp: %s\n", s);
    return -1;
  }

  /* check to make sure the item is not already on this list */
  for (last = *list; last; last = last->next)
  {
    if (ascii_strcasecmp (rx->pattern, last->rx->pattern) == 0)
    {
      /* already on the list, so just ignore it */
      last = NULL;
      break;
    }
    if (!last->next)
      break;
  }

  if (!*list || last)
  {
    t = mutt_new_rx_list();
    t->rx = rx;
    if (last)
    {
      last->next = t;
      last = last->next;
    }
    else
      *list = last = t;
  }
  else /* duplicate */
    mutt_free_regexp (&rx);

  return 0;
}


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static int add_to_spam_list (SPAM_LIST **list, const char *pat, const char *templ, BUFFER *err)
{
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  SPAM_LIST *t = NULL, *last = NULL;
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  REGEXP *rx;
  int n;
  const char *p;

  if (!pat || !*pat || !templ)
    return 0;

  if (!(rx = mutt_compile_regexp (pat, REG_ICASE)))
  {
    snprintf (err->data, err->dsize, _("Bad regexp: %s"), pat);
    return -1;
  }

  /* check to make sure the item is not already on this list */
  for (last = *list; last; last = last->next)
  {
    if (ascii_strcasecmp (rx->pattern, last->rx->pattern) == 0)
    {
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      /* Already on the list. Formerly we just skipped this case, but
       * now we're supporting removals, which means we're supporting
       * re-adds conceptually. So we probably want this to imply a
       * removal, then do an add. We can achieve the removal by freeing
       * the template, and leaving t pointed at the current item.
       */
      t = last;
      safe_free(&t->template);
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      break;
    }
    if (!last->next)
      break;
  }

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  /* If t is set, it's pointing into an extant SPAM_LIST* that we want to
   * update. Otherwise we want to make a new one to link at the list's end.
   */
  if (!t)
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  {
    t = mutt_new_spam_list();
    t->rx = rx;
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    if (last)
      last->next = t;
    else
      *list = t;
  }
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  /* Now t is the SPAM_LIST* that we want to modify. It is prepared. */
  t->template = safe_strdup(templ);

  /* Find highest match number in template string */
  t->nmatch = 0;
  for (p = templ; *p;)
  {
    if (*p == '%')
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    {
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        n = atoi(++p);
        if (n > t->nmatch)
          t->nmatch = n;
        while (*p && isdigit((int)*p))
          ++p;
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    }
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    else
        ++p;
  }
  t->nmatch++;		/* match 0 is always the whole expr */
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  return 0;
}

static int remove_from_spam_list (SPAM_LIST **list, const char *pat)
{
  SPAM_LIST *spam, *prev;
  int nremoved = 0;

  /* Being first is a special case. */
  spam = *list;
  if (spam->rx && !mutt_strcmp(spam->rx->pattern, pat))
  {
    *list = spam->next;
    mutt_free_regexp(&spam->rx);
    safe_free(&spam->template);
    safe_free(&spam);
    return 1;
  }

  prev = spam;
  for (spam = prev->next; spam;)
  {
    if (!mutt_strcmp(spam->rx->pattern, pat))
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    {
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      prev->next = spam->next;
      mutt_free_regexp(&spam->rx);
      safe_free(&spam->template);
      safe_free(&spam);
      spam = prev->next;
      ++nremoved;
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    }
    else
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      spam = spam->next;
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  }

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  return nremoved;
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}


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static void remove_from_list (LIST **l, const char *str)
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{
  LIST *p, *last = NULL;

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  if (mutt_strcmp ("*", str) == 0)
    mutt_free_list (l);    /* ``unCMD *'' means delete all current entries */
  else
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  {
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    p = *l;
    last = NULL;
    while (p)
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    {
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      if (ascii_strcasecmp (str, p->data) == 0)
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      {
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	FREE (&p->data);
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	if (last)
	  last->next = p->next;
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	else
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	  (*l) = p->next;
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	FREE (&p);
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      }
      else
      {
	last = p;
	p = p->next;
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      }
    }
  }
}

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static void remove_from_rx_list (RX_LIST **l, const char *str)
{
  RX_LIST *p, *last = NULL;

  if (mutt_strcmp ("*", str) == 0)
    mutt_free_rx_list (l);    /* ``unCMD *'' means delete all current entries */
  else
  {
    p = *l;
    last = NULL;
    while (p)
    {
      if (ascii_strcasecmp (str, p->rx->pattern) == 0)
      {
	mutt_free_regexp (&p->rx);
	if (last)
	  last->next = p->next;
	else
	  (*l) = p->next;
	FREE (&p);
      }
      else
      {
	last = p;
	p = p->next;
      }
    }
  }
}

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static int parse_unignore (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
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  do
  {
    mutt_extract_token (buf, s, 0);
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    /* don't add "*" to the unignore list */
    if (strcmp (buf->data, "*")) 
      add_to_list (&UnIgnore, buf->data);

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    remove_from_list (&Ignore, buf->data);
  }
  while (MoreArgs (s));

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  return 0;
}

static int parse_ignore (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
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  do
  {
    mutt_extract_token (buf, s, 0);
    remove_from_list (&UnIgnore, buf->data);
    add_to_list (&Ignore, buf->data);
  }
  while (MoreArgs (s));

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  return 0;
}

static int parse_list (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
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  do
  {
    mutt_extract_token (buf, s, 0);
    add_to_list ((LIST **) data, buf->data);
  }
  while (MoreArgs (s));

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  return 0;
}

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static int _parse_rx_list (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err, int flags)
{
  do 
  {
    mutt_extract_token (buf, s, 0);
    if (add_to_rx_list ((RX_LIST **) data, buf->data, flags, err) != 0)
      return -1;
	
  }
  while (MoreArgs (s));
  
  return 0;
}

static int parse_rx_list (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  return _parse_rx_list (buf, s, data, err, REG_ICASE);
}

static int parse_rx_unlist (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  do
  {
    mutt_extract_token (buf, s, 0);
    if (mutt_strcmp (buf->data, "*") == 0)
    {
      mutt_free_rx_list ((RX_LIST **) data);
      break;
    }
    remove_from_rx_list ((RX_LIST **) data, buf->data);
  }
  while (MoreArgs (s));
  
  return 0;
}

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static void _alternates_clean (void)
{
  int i;
  if (Context && Context->msgcount) 
  {
    for (i = 0; i < Context->msgcount; i++)
      Context->hdrs[i]->recip_valid = 0;
  }
}

static int parse_alternates (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  _alternates_clean();
  return parse_rx_list (buf, s, data, err);
}

static int parse_unalternates (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  _alternates_clean();
  return parse_rx_unlist (buf, s, data, err);
}

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static int parse_spam_list (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  BUFFER templ;

  memset(&templ, 0, sizeof(templ));

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  /* Insist on at least one parameter */
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  if (!MoreArgs(s))
  {
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    if (data == M_SPAM)
      strfcpy(err->data, _("spam: no matching pattern"), err->dsize);
    else
      strfcpy(err->data, _("nospam: no matching pattern"), err->dsize);
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    return -1;
  }
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  /* Extract the first token, a regexp */
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  mutt_extract_token (buf, s, 0);

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  /* data should be either M_SPAM or M_NOSPAM. M_SPAM is for spam commands. */
  if (data == M_SPAM)
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  {
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    /* If there's a second parameter, it's a template for the spam tag. */
    if (MoreArgs(s))
    {
      mutt_extract_token (&templ, s, 0);

      /* Add to the spam list. */
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      if (add_to_spam_list (&SpamList, buf->data, templ.data, err) != 0) {
	  FREE(&templ.data);
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          return -1;
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      }
      FREE(&templ.data);
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    }

    /* If not, try to remove from the nospam list. */
    else
    {
      remove_from_rx_list(&NoSpamList, buf->data);
    }

    return 0;
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  }
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  /* M_NOSPAM is for nospam commands. */
  else if (data == M_NOSPAM)
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  {
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    /* nospam only ever has one parameter. */
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    /* "*" is a special case. */
    if (!mutt_strcmp(buf->data, "*"))
    {
      mutt_free_spam_list (&SpamList);
      mutt_free_rx_list (&NoSpamList);
      return 0;
    }

    /* If it's on the spam list, just remove it. */
    if (remove_from_spam_list(&SpamList, buf->data) != 0)
      return 0;

    /* Otherwise, add it to the nospam list. */
    if (add_to_rx_list (&NoSpamList, buf->data, REG_ICASE, err) != 0)
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      return -1;
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    return 0;
  }

  /* This should not happen. */
  strfcpy(err->data, "This is no good at all.", err->dsize);
  return -1;
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}

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static int parse_unlist (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
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  do
  {
    mutt_extract_token (buf, s, 0);
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    /*
     * Check for deletion of entire list
     */
    if (mutt_strcmp (buf->data, "*") == 0)
    {
      mutt_free_list ((LIST **) data);
      break;
    }
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    remove_from_list ((LIST **) data, buf->data);
  }
  while (MoreArgs (s));

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  return 0;
}

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static int parse_unlists (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  do
  {
    mutt_extract_token (buf, s, 0);
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    remove_from_rx_list (&MailLists, buf->data);
    remove_from_rx_list (&SubscribedLists, buf->data);
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  }
  while (MoreArgs (s));

  return 0;
}

static int parse_subscribe (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  do
  {
    mutt_extract_token (buf, s, 0);
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    if (add_to_rx_list (&MailLists, buf->data, REG_ICASE, err) != 0)
      return -1;
    if (add_to_rx_list (&SubscribedLists, buf->data, REG_ICASE, err) != 0)
      return -1;
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  }
  while (MoreArgs (s));

  return 0;
}
  
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static int parse_unalias (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  ALIAS *tmp, *last = NULL;

  do
  {
    mutt_extract_token (buf, s, 0);

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    if (mutt_strcmp ("*", buf->data) == 0)
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    {
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      if (CurrentMenu == MENU_ALIAS)
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      {
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	for (tmp = Aliases; tmp ; tmp = tmp->next)
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	  tmp->del = 1;
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	set_option (OPTFORCEREDRAWINDEX);
      }
      else
	mutt_free_alias (&Aliases);
      break;
    }
    else
      for (tmp = Aliases; tmp; tmp = tmp->next)
      {
	if (mutt_strcasecmp (buf->data, tmp->name) == 0)
	{
	  if (CurrentMenu == MENU_ALIAS)
	  {
	    tmp->del = 1;
	    set_option (OPTFORCEREDRAWINDEX);
	    break;
	  }

	  if (last)
	    last->next = tmp->next;
	  else
	    Aliases = tmp->next;
	  tmp->next = NULL;
	  mutt_free_alias (&tmp);
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	  break;
	}
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	last = tmp;
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      }
  }
  while (MoreArgs (s));
  return 0;
}

static int parse_alias (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  ALIAS *tmp = Aliases;
  ALIAS *last = NULL;
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  char *estr = NULL;
  
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  if (!MoreArgs (s))
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  {
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    strfcpy (err->data, _("alias: no address"), err->dsize);
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    return (-1);
  }

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  mutt_extract_token (buf, s, 0);
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  dprint (2, (debugfile, "parse_alias: First token is '%s'.\n",
	      buf->data));
  
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  /* check to see if an alias with this name already exists */
  for (; tmp; tmp = tmp->next)
  {
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    if (!mutt_strcasecmp (tmp->name, buf->data))
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      break;
    last = tmp;
  }

  if (!tmp)
  {
    /* create a new alias */
    tmp = (ALIAS *) safe_calloc (1, sizeof (ALIAS));
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    tmp->self = tmp;
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    tmp->name = safe_strdup (buf->data);
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    /* give the main addressbook code a chance */
    if (CurrentMenu == MENU_ALIAS)
      set_option (OPTMENUCALLER);
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  }
  else
  {
    /* override the previous value */
    rfc822_free_address (&tmp->addr);
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    if (CurrentMenu == MENU_ALIAS)
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      set_option (OPTFORCEREDRAWINDEX);
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  }

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  mutt_extract_token (buf, s, M_TOKEN_QUOTE | M_TOKEN_SPACE | M_TOKEN_SEMICOLON);
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  dprint (2, (debugfile, "parse_alias: Second token is '%s'.\n",
	      buf->data));
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  tmp->addr = mutt_parse_adrlist (tmp->addr, buf->data);
  if (last)
    last->next = tmp;
  else
    Aliases = tmp;
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  if (mutt_addrlist_to_idna (tmp->addr, &estr))
  {
    snprintf (err->data, err->dsize, _("Warning: Bad IDN '%s' in alias '%s'.\n"),
	      estr, tmp->name);
    return -1;
  }
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#ifdef DEBUG
  if (debuglevel >= 2) 
  {
    ADDRESS *a;
    for (a = tmp->addr; a; a = a->next)
    {
      if (!a->group)
	dprint (2, (debugfile, "parse_alias:   %s\n",
		    a->mailbox));
      else
	dprint (2, (debugfile, "parse_alias:   Group %s\n",
		    a->mailbox));
    }
  }
#endif
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  return 0;
}

static int
parse_unmy_hdr (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  LIST *last = NULL;
  LIST *tmp = UserHeader;
  LIST *ptr;
  size_t l;

  do
  {
    mutt_extract_token (buf, s, 0);
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    if (mutt_strcmp ("*", buf->data) == 0)
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      mutt_free_list (&UserHeader);
    else
    {
      tmp = UserHeader;
      last = NULL;

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      l = mutt_strlen (buf->data);
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      if (buf->data[l - 1] == ':')
	l--;

      while (tmp)
      {
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	if (ascii_strncasecmp (buf->data, tmp->data, l) == 0 && tmp->data[l] == ':')
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	{
	  ptr = tmp;
	  if (last)
	    last->next = tmp->next;
	  else
	    UserHeader = tmp->next;
	  tmp = tmp->next;
	  ptr->next = NULL;
	  mutt_free_list (&ptr);
	}
	else
	{
	  last = tmp;
	  tmp = tmp->next;
	}
      }
    }
  }
  while (MoreArgs (s));
  return 0;
}

static int parse_my_hdr (BUFFER *buf, BUFFER *s, unsigned long data, BUFFER *err)
{
  LIST *tmp;
  size_t keylen;
  char *p;

  mutt_extract_token (buf, s, M_TOKEN_SPACE | M_TOKEN_QUOTE);
  if ((p = strpbrk (buf->data, ": \t")) == NULL || *p != ':')
  {
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    strfcpy (err->data, _("invalid header field"), err->dsize);
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    return (-1);
  }
  keylen = p - buf->data + 1;

  if (UserHeader)
  {
    for (tmp = UserHeader; ; tmp = tmp->next)
    {
      /* see if there is already a field by this name */
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      if (ascii_strncasecmp (buf->data, tmp->data, keylen) == 0)
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      {
	/* replace the old value */
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	FREE (&tmp->data);
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	tmp->data = buf->data;
	memset (buf, 0, sizeof (BUFFER));
	return 0;
      }
      if (!tmp->next)
	break;
    }
    tmp->next = mutt_new_list ();
    tmp = tmp->next;
  }
  else
  {
    tmp = mutt_new_list ();
    UserHeader = tmp;
  }
  tmp->data = buf->data;
  memset (buf, 0, sizeof (BUFFER));
  return 0;
}

static int
parse_sort (short *val, const char *s, const struct mapping_t *map, BUFFER *err)
{
  int i, flags = 0;

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  if (mutt_strncmp ("reverse-", s, 8) == 0)
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  {
    s += 8;
    flags = SORT_REVERSE;
  }
  
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  if (mutt_strncmp ("last-", s, 5) == 0)
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  {
    s += 5;
    flags |= SORT_LAST;
  }

  if ((i = mutt_getvaluebyname (s, map)) == -1)
  {
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    snprintf (err->data, err->dsize, _("%s: unknown sorting method"), s);
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    return (-1);
  }

  *val = i | flags;

  return 0;
}

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static void mutt_set_default (struct option_t *p)
{
  switch (p->type & DT_MASK)
  {
    case DT_STR:
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      if (!p->init && *((char **) p->data))
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        p->init = (unsigned long) safe_strdup (* ((char **) p->data));
      break;
    case DT_PATH:
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      if (!p->init && *((char **) p->data))
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      {
	char *cp = safe_strdup (*((char **) p->data));
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	/* mutt_pretty_mailbox (cp); */
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        p->init = (unsigned long) cp;
      }
      break;
    case DT_ADDR:
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      if (!p->init && *((ADDRESS **) p->data))
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      {
	char tmp[HUGE_STRING];
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	*tmp = '\0';
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	rfc822_write_address (tmp, sizeof (tmp), *((ADDRESS **) p->data), 0);
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	p->init = (unsigned long) safe_strdup (tmp);
      }
      break;
    case DT_RX:
    {
      REGEXP *pp = (REGEXP *) p->data;
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      if (!p->init && pp->pattern)
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	p->init = (unsigned long) safe_strdup (pp->pattern);
      break;
    }
  }
}

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static void mutt_restore_default (struct option_t *p)
{
  switch (p->type & DT_MASK)
  {
    case DT_STR:
      if (p->init)
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	mutt_str_replace ((char **) p->data, (char *) p->init); 
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      break;
    case DT_PATH:
      if (p->init)
      {
	char path[_POSIX_PATH_MAX];

	strfcpy (path, (char *) p->init, sizeof (path));
	mutt_expand_path (path, sizeof (path));
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	mutt_str_replace ((char **) p->data, path);
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      }
      break;
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    case DT_ADDR:
      if (p->init)
      {
	rfc822_free_address ((ADDRESS **) p->data);
	*((ADDRESS **) p->data) = rfc822_parse_adrlist (NULL, (char *) p->init);
      }
      break;
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    case DT_BOOL:
      if (p->init)
	set_option (p->data);
      else
	unset_option (p->data);
      break;
    case DT_QUAD:
      set_quadoption (p->data, p->init);
      break;
    case DT_NUM:
    case DT_SORT:
    case DT_MAGIC:
      *((short *) p->data) = p->init;
      break;
    case DT_RX:
      {
	REGEXP *pp = (REGEXP *) p->data;
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	int flags = 0;

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	FREE (&pp->pattern);
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	if (pp->rx)
	{
	  regfree (pp->rx);
	  FREE (&pp->rx);
	}
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	if (p->init)
	{
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	  char *s = (char *) p->init;

	  pp->rx = safe_calloc (1, sizeof (regex_t));
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	  pp->pattern = safe_strdup ((char *) p->init);
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	  if (mutt_strcmp (p->option, "mask") != 0)
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	    flags |= mutt_which_case ((const char *) p->init);
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	  if (mutt_strcmp (p->option, "mask") == 0 && *s == '!')
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	  {
	    s++;
	    pp->not = 1;
	  }
	  if (REGCOMP (pp->rx, s, flags) != 0)
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	  {
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	    fprintf (stderr, _("mutt_restore_default(%s): error in regexp: %s\n"),
		     p->option, pp->pattern);
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	    FREE (&pp->pattern);
	    regfree (pp->rx);
	    FREE (&pp->rx);
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	  }
	}
      }
      break;
  }
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  if (p->flags & R_INDEX)
    set_option (OPTFORCEREDRAWINDEX);
  if (p->flags & R_PAGER)
    set_option (OPTFORCEREDRAWPAGER);
  if (p->flags & R_RESORT_SUB)
    set_option (OPTSORTSUBTHREADS);
  if (p->flags & R_RESORT)
    set_option (OPTNEEDRESORT);
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  if (p->flags & R_RESORT_INIT)
    set_option (OPTRESORTINIT);
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  if (p->flags & R_TREE)
    set_option (OPTREDRAWTREE);
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}

static int parse_set (BUFFER *tmp, BUFFER *s, unsigned long data, BUFFER *err)
{
  int idx, query, unset, inv, reset, r = 0;
  char *p, scratch[_POSIX_PATH_MAX];

  while (MoreArgs (s))
  {
    /* reset state variables */
    query = 0;
    unset = data & M_SET_UNSET;
    inv = data & M_SET_INV;
    reset = data & M_SET_RESET;

    if (*s->dptr == '?')
    {
      query = 1;
      s->dptr++;
    }
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    else if (mutt_strncmp ("no", s->dptr, 2) == 0)
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    {
      s->dptr += 2;
      unset = !unset;
    }
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    else if (mutt_strncmp ("inv", s->dptr, 3) == 0)
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    {
      s->dptr += 3;
      inv = !inv;
    }
    else if (*s->dptr == '&')
    {
      reset = 1;
      s->dptr++;
    }

    /* get the variable name */
    mutt_extract_token (tmp, s, M_TOKEN_EQUAL);

    if ((idx = mutt_option_index (tmp->data)) == -1 &&
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	!(reset && !mutt_strcmp ("all", tmp->data)))
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    {
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      snprintf (err->data, err->dsize, _("%s: unknown variable"), tmp->data);
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      return (-1);
    }
    SKIPWS (s->dptr);

    if (reset)
    {
      if (query || unset || inv)
      {
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	snprintf (err->data, err->dsize, _("prefix is illegal with reset"));
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	return (-1);
      }

      if (s && *s->dptr == '=')
      {
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	snprintf (err->data, err->dsize, _("value is illegal with reset"));
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	return (-1);
      }
     
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      if (!mutt_strcmp ("all", tmp->data))
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      {
	for (idx = 0; MuttVars[idx].option; idx++)
	  mutt_restore_default (&MuttVars[idx]);
	return 0;
      }
      else
	mutt_restore_default (&MuttVars[idx]);
    } 
    else if (DTYPE (MuttVars[idx].type) == DT_BOOL)
    { 
      if (s && *s->dptr == '=')
      {
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	if (unset || inv || query)
	{
	  snprintf (err->data, err->dsize, "Usage: set variable=yes|no");
	  return (-1);
	}

	s->dptr++;
	mutt_extract_token (tmp, s, 0);
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	if (ascii_strcasecmp ("yes", tmp->data) == 0)
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	  unset = inv = 0;
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	else if (ascii_strcasecmp ("no", tmp->data) == 0)
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	  unset = 1;
	else
	{
	  snprintf (err->data, err->dsize, "Usage: set variable=yes|no");
	  return (-1);
	}
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      }

      if (query)
      {
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	snprintf (err->data, err->dsize, option (MuttVars[idx].data)
			? _("%s is set") : _("%s is unset"), tmp->data);
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	return 0;
      }

      if (unset)
	unset_option (MuttVars[idx].data);
      else if (inv)
	toggle_option (MuttVars[idx].data);
      else
	set_option (MuttVars[idx].data);
    }
    else if (DTYPE (MuttVars[idx].type) == DT_STR ||
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	     DTYPE (MuttVars[idx].type) == DT_PATH ||
	     DTYPE (MuttVars[idx].type) == DT_ADDR)
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    {
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      if (unset)
      {
	if (DTYPE (MuttVars[idx].type) == DT_ADDR)
	  rfc822_free_address ((ADDRESS **) MuttVars[idx].data);
	else
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	  FREE ((void *) MuttVars[idx].data);
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      }
      else if (query || *s->dptr != '=')
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      {
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	char _tmp[STRING];
	char *val = NULL;
	
	if (DTYPE (MuttVars[idx].type) == DT_ADDR)
	{
	  _tmp[0] = '\0';
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	  rfc822_write_address (_tmp, sizeof (_tmp), *((ADDRESS **) MuttVars[idx].data), 0);
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	  val = _tmp;
	}
	else
	  val = *((char **) MuttVars[idx].data);
	
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	/* user requested the value of this variable */
	snprintf (err->data, err->dsize, "%s=\"%s\"", MuttVars[idx].option,
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		  NONULL (val));
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	break;
      }
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      else
      {
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        s->dptr++;

        /* copy the value of the string */
        if (DTYPE (MuttVars[idx].type) == DT_ADDR)
	  rfc822_free_address ((ADDRESS **) MuttVars[idx].data);
        else
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	  FREE ((void *) MuttVars[idx].data);
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        mutt_extract_token (tmp, s, 0);
        if (DTYPE (MuttVars[idx].type) == DT_PATH)
        {
	  strfcpy (scratch, tmp->data, sizeof (scratch));
	  mutt_expand_path (scratch, sizeof (scratch));
	  *((char **) MuttVars[idx].data) = safe_strdup (scratch);
        }
        else if (DTYPE (MuttVars[idx].type) == DT_STR)
        {
	  *((char **) MuttVars[idx].data) = safe_strdup (tmp->data);
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	  if (mutt_strcmp (MuttVars[idx].option, "charset") == 0)
	    mutt_set_charset (Charset);
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        }
        else
        {
	  *((ADDRESS **) MuttVars[idx].data) = rfc822_parse_adrlist (NULL, tmp->data);
        }
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      }
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    }
    else if (DTYPE(MuttVars[idx].type) == DT_RX)
    {
      REGEXP *ptr = (REGEXP *) MuttVars[idx].data;
      regex_t *rx;
      int e, flags = 0;

      if (query || *s->dptr != '=')
      {
	/* user requested the value of this variable */
	snprintf (err->data, err->dsize, "%s=\"%s\"", MuttVars[idx].option,
		  NONULL (ptr->pattern));
	break;
      }

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      if (option(OPTATTACHMSG) && !mutt_strcmp(MuttVars[idx].option, "reply_regexp"))
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      {
	snprintf (err->data, err->dsize, "Operation not permitted when in attach-message mode.");
	r = -1;
	break;
      }
      
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      s->dptr++;

      /* copy the value of the string */
      mutt_extract_token (tmp, s, 0);

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      if (!ptr->pattern || mutt_strcmp (ptr->pattern, tmp->data) != 0)
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      {
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	int not = 0;

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	/* $mask is case-sensitive */
	if (mutt_strcmp (MuttVars[idx].option, "mask") != 0)
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	  flags |= mutt_which_case (tmp->data);
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	p = tmp->data;
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	if (mutt_strcmp (MuttVars[idx].option, "mask") == 0)
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	{
	  if (*p == '!')
	  {
	    not = 1;
	    p++;
	  }
	}
	  
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	rx = (regex_t *) safe_malloc (sizeof (regex_t));
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	if ((e = REGCOMP (rx, p, flags)) != 0)
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	{
	  regerror (e, rx, err->data, err->dsize);
	  regfree (rx);
	  FREE (&rx);
	  break;
	}

	/* get here only if everything went smootly */
	if (ptr->pattern)
	{
	  FREE (&ptr->pattern);
	  regfree ((regex_t *) ptr->rx);
	  FREE (&ptr->rx);
	}

	ptr->pattern = safe_strdup (tmp->data);
	ptr->rx = rx;
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	ptr->not = not;
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	/* $reply_regexp and $alterantes require special treatment */
	
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	if (Context && Context->msgcount &&
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	    mutt_strcmp (MuttVars[idx].option, "reply_regexp") == 0)
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	{
	  regmatch_t pmatch[1];
	  int i;
	  
#define CUR_ENV Context->hdrs[i]->env
	  for (i = 0; i < Context->msgcount; i++)
	  {
	    if (CUR_ENV && CUR_ENV->subject)
	    {
	      CUR_ENV->real_subj = (regexec (ReplyRegexp.rx,
				    CUR_ENV->subject, 1, pmatch, 0)) ?
				    CUR_ENV->subject : 
				    CUR_ENV->subject + pmatch[0].rm_eo;
	    }
	  }
#undef CUR_ENV
	}
      }
    }
    else if (DTYPE(MuttVars[idx].type) == DT_MAGIC)
    {
      if (query || *s->dptr != '=')
      {
	switch (DefaultMagic)
	{
	  case M_MBOX:
	    p = "mbox";
	    break;
	  case M_MMDF:
	    p = "MMDF";
	    break;
	  case M_MH:
	    p = "MH";
	    break;
	  case M_MAILDIR:
	    p = "Maildir";
	    break;
	  default:
	    p = "unknown";
	    break;
	}
	snprintf (err->data, err->dsize, "%s=%s", MuttVars[idx].option, p);
	break;
      }

      s->dptr++;

      /* copy the value of the string */
      mutt_extract_token (tmp, s, 0);
      if (mx_set_magic (tmp->data))
      {
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	snprintf (err->data, err->dsize, _("%s: invalid mailbox type"), tmp->data);
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	r = -1;
	break;
      }
    }
    else if (DTYPE(MuttVars[idx].type) == DT_NUM)
    {
      short *ptr = (short *) MuttVars[idx].data;
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      int val;
      char *t;
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      if (query || *s->dptr != '=')
      {
	/* user requested the value of this variable */
	snprintf (err->data, err->dsize, "%s=%d", MuttVars[idx].option, *ptr);
	break;
      }

      s->dptr++;

      mutt_extract_token (tmp, s, 0);
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      val = strtol (tmp->data, &t, 0);

      if (!*tmp->data || *t || (short) val != val)
      {
	snprintf (err->data, err->dsize, _("%s: invalid value"), tmp->data);
	r = -1;
	break;
      }
      else
	*ptr = (short) val;
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      /* these ones need a sanity check */
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      if (mutt_strcmp (MuttVars[idx].option, "history") == 0)
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      {
	if (*ptr < 0)
	  *ptr = 0;
	mutt_init_history ();
      }
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      else if (mutt_strcmp (MuttVars[idx].option, "pager_index_lines") == 0)
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      {
	if (*ptr < 0)
	  *ptr = 0;
      }
    }
    else if (DTYPE (MuttVars[idx].type) == DT_QUAD)
    {
      if (query)
      {
	char *vals[] = { "no", "yes", "ask-no", "ask-yes" };

	snprintf (err->data, err->dsize, "%s=%s", MuttVars[idx].option,
		  vals [ quadoption (MuttVars[idx].data) ]);
	break;
      }

      if (*s->dptr == '=')
      {
	s->dptr++;
	mutt_extract_token (tmp, s, 0);
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	if (ascii_strcasecmp ("yes", tmp->data) == 0)
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	  set_quadoption (MuttVars[idx].data, M_YES);
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	else if (ascii_strcasecmp ("no", tmp->data) == 0)
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	  set_quadoption (MuttVars[idx].data, M_NO);
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	else if (ascii_strcasecmp ("ask-yes", tmp->data) == 0)
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	  set_quadoption (MuttVars[idx].data, M_ASKYES);
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	else if (ascii_strcasecmp ("ask-no", tmp->data) == 0)
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	  set_quadoption (MuttVars[idx].data, M_ASKNO);
	else
	{
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	  snprintf (err->data, err->dsize, _("%s: invalid value"), tmp->data);
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	  r = -1;
	  break;
	}
      }
      else
      {
	if (inv)
	  toggle_quadoption (MuttVars[idx].data);
	else if (unset)
	  set_quadoption (MuttVars[idx].data, M_NO);
	else
	  set_quadoption (MuttVars[idx].data, M_YES);
      }
    }
    else if (DTYPE (MuttVars[idx].type) == DT_SORT)
    {
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      const struct mapping_t *map = NULL;
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      switch (MuttVars[idx].type & DT_SUBTYPE_MASK)
      {
	case DT_SORT_ALIAS:
	  map = SortAliasMethods;
	  break;
	case DT_SORT_BROWSER:
	  map = SortBrowserMethods;
	  break;
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	case DT_SORT_KEYS:
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          if ((WithCrypto & APPLICATION_PGP))
            map = SortKeyMethods;
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	  break;
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	case DT_SORT_AUX:
	  map = SortAuxMethods;
	  break;
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