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list.c

/*
 * Heirloom mailx - a mail user agent derived from Berkeley Mail.
 *
 * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
 */
/*
 * Copyright (c) 1980, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#ifdef      DOSCCS
static char sccsid[] = "@(#)list.c  2.61 (gritter) 01/07/07";
#endif
#endif /* not lint */

#include "rcv.h"
#include <ctype.h>
#include "extern.h"
#ifdef      HAVE_WCTYPE_H
#include <wctype.h>
#endif      /* HAVE_WCTYPE_H */

/*
 * Mail -- a mail program
 *
 * Message list handling.
 */

enum idfield {
      ID_REFERENCES,
      ID_IN_REPLY_TO
};

static char **add_to_namelist(char ***namelist, size_t *nmlsize,
            char **np, char *string);
static int markall(char *buf, int f);
static int evalcol(int col);
static int check(int mesg, int f);
static int scan(char **sp);
static void regret(int token);
static void scaninit(void);
static int matchsender(char *str, int mesg, int allnet);
static int matchmid(char *id, enum idfield idfield, int mesg);
static int matchsubj(char *str, int mesg);
static void unmark(int mesg);
static int metamess(int meta, int f);

static size_t     STRINGLEN;

static int  lexnumber;        /* Number of TNUMBER from scan() */
static char *lexstring;       /* String from TSTRING, scan() */
static int  regretp;          /* Pointer to TOS of regret tokens */
static int  regretstack[REGDEP];    /* Stack of regretted tokens */
static char *string_stack[REGDEP];  /* Stack of regretted strings */
static int  numberstack[REGDEP];    /* Stack of regretted numbers */
static int  threadflag;       /* mark entire threads */

/*
 * Convert the user string of message numbers and
 * store the numbers into vector.
 *
 * Returns the count of messages picked up or -1 on error.
 */
int 
getmsglist(char *buf, int *vector, int flags)
{
      int *ip;
      struct message *mp;
      int   mc;

      if (msgCount == 0) {
            *vector = 0;
            return 0;
      }
      if (markall(buf, flags) < 0)
            return(-1);
      ip = vector;
      if (inhook & 2) {
            mc = 0;
            for (mp = &message[0]; mp < &message[msgCount]; mp++)
                  if (mp->m_flag & MMARK) {
                        if ((mp->m_flag & MNEWEST) == 0)
                              unmark(mp - &message[0] + 1);
                        else
                              mc++;
                  }
            if (mc == 0)
                  return -1;
      }
      if (mb.mb_threaded == 0) {
            for (mp = &message[0]; mp < &message[msgCount]; mp++)
                  if (mp->m_flag & MMARK)
                        *ip++ = mp - &message[0] + 1;
      } else {
            for (mp = threadroot; mp; mp = next_in_thread(mp))
                  if (mp->m_flag & MMARK)
                        *ip++ = mp - &message[0] + 1;
      }
      *ip = 0;
      return(ip - vector);
}

/*
 * Mark all messages that the user wanted from the command
 * line in the message structure.  Return 0 on success, -1
 * on error.
 */

/*
 * Bit values for colon modifiers.
 */

#define     CMNEW       01          /* New messages */
#define     CMOLD       02          /* Old messages */
#define     CMUNREAD    04          /* Unread messages */
#define     CMDELETED   010         /* Deleted messages */
#define     CMREAD            020         /* Read messages */
#define     CMFLAG            040         /* Flagged messages */
#define     CMANSWER    0100        /* Answered messages */
#define     CMDRAFT           0200        /* Draft messages */
#define     CMKILL            0400        /* Killed messages */
#define     CMJUNK            01000       /* Junk messages */

/*
 * The following table describes the letters which can follow
 * the colon and gives the corresponding modifier bit.
 */

static struct coltab {
      char  co_char;          /* What to find past : */
      int   co_bit;                 /* Associated modifier bit */
      int   co_mask;          /* m_status bits to mask */
      int   co_equal;         /* ... must equal this */
} coltab[] = {
      { 'n',            CMNEW,            MNEW,       MNEW },
      { 'o',            CMOLD,            MNEW,       0 },
      { 'u',            CMUNREAD,   MREAD,            0 },
      { 'd',            CMDELETED,  MDELETED,   MDELETED },
      { 'r',            CMREAD,           MREAD,            MREAD },
      { 'f',            CMFLAG,           MFLAGGED,   MFLAGGED },
      { 'a',            CMANSWER,   MANSWERED,  MANSWERED },
      { 't',            CMDRAFT,    MDRAFTED,   MDRAFTED },
      { 'k',            CMKILL,           MKILL,            MKILL },
      { 'j',            CMJUNK,           MJUNK,            MJUNK },
      { 0,        0,          0,          0 }
};

static      int   lastcolmod;

static char **
add_to_namelist(char ***namelist, size_t *nmlsize, char **np, char *string)
{
      size_t idx;

      if ((idx = np - *namelist) >= *nmlsize) {
            *namelist = srealloc(*namelist, (*nmlsize += 8) * sizeof *np);
            np = &(*namelist)[idx];
      }
      *np++ = string;
      return np;
}

#define     markall_ret(i)          { \
                              retval = i; \
                              ac_free(lexstring); \
                              goto out; \
                        }

static int 
markall(char *buf, int f)
{
      char **np, **nq;
      int i, retval, gotheaders;
      struct message *mp, *mx;
      char **namelist, *bufp, *id = NULL, *cp;
      int tok, beg, mc, star, other, valdot, colmod, colresult, topen, tback;
      size_t nmlsize;
      enum idfield      idfield = ID_REFERENCES;

      lexstring = ac_alloc(STRINGLEN = 2 * strlen(buf) + 1);
      valdot = dot - &message[0] + 1;
      colmod = 0;
      for (i = 1; i <= msgCount; i++) {
            message[i-1].m_flag &= ~MOLDMARK;
            if (message[i-1].m_flag & MMARK)
                  message[i-1].m_flag |= MOLDMARK;
            unmark(i);
      }
      bufp = buf;
      mc = 0;
      namelist = smalloc((nmlsize = 8) * sizeof *namelist);
      np = &namelist[0];
      scaninit();
      tok = scan(&bufp);
      star = 0;
      other = 0;
      beg = 0;
      topen = 0;
      tback = 0;
      gotheaders = 0;
      while (tok != TEOL) {
            switch (tok) {
            case TNUMBER:
number:
                  if (star) {
                        printf(catgets(catd, CATSET, 112,
                              "No numbers mixed with *\n"));
                        markall_ret(-1)
                  }
                  mc++;
                  other++;
                  if (beg != 0) {
                        if (check(lexnumber, f))
                              markall_ret(-1)
                        i = beg;
                        while (mb.mb_threaded ? 1 : i <= lexnumber) {
                              if (!(message[i-1].m_flag&MHIDDEN) &&
                                          (f == MDELETED ||
                                           (message[i-1].m_flag &
                                            MDELETED) == 0))
                                    mark(i, f);
                              if (mb.mb_threaded) {
                                    if (i == lexnumber)
                                          break;
                                    mx = next_in_thread(&message[i-1]);
                                    if (mx == NULL)
                                          markall_ret(-1)
                                    i = mx-message+1;
                              } else
                                    i++;
                        }
                        beg = 0;
                        break;
                  }
                  beg = lexnumber;
                  if (check(beg, f))
                        markall_ret(-1)
                  tok = scan(&bufp);
                  regret(tok);
                  if (tok != TDASH) {
                        mark(beg, f);
                        beg = 0;
                  }
                  break;

            case TPLUS:
                  if (beg != 0) {
                        printf(catgets(catd, CATSET, 113,
                              "Non-numeric second argument\n"));
                        markall_ret(-1)
                  }
                  i = valdot;
                  do {
                        if (mb.mb_threaded) {
                              mx = next_in_thread(&message[i-1]);
                              i = mx ? mx-message+1 : msgCount+1;
                        } else
                              i++;
                        if (i > msgCount) {
                              printf(catgets(catd, CATSET, 114,
                                    "Referencing beyond EOF\n"));
                              markall_ret(-1)
                        }
                  } while (message[i-1].m_flag == MHIDDEN ||
                              (message[i-1].m_flag & MDELETED) != f ||
                              message[i-1].m_flag & MKILL);
                  mark(i, f);
                  break;

            case TDASH:
                  if (beg == 0) {
                        i = valdot;
                        do {
                              if (mb.mb_threaded) {
                                    mx = prev_in_thread(
                                                &message[i-1]);
                                    i = mx ? mx-message+1 : 0;
                              } else
                                    i--;
                              if (i <= 0) {
                                    printf(catgets(catd, CATSET,
                                          115,
                                    "Referencing before 1\n"));
                                    markall_ret(-1)
                              }
                        } while (message[i-1].m_flag & MHIDDEN ||
                                    (message[i-1].m_flag & MDELETED)
                                          != f ||
                                    message[i-1].m_flag & MKILL);
                        mark(i, f);
                  }
                  break;

            case TSTRING:
                  if (beg != 0) {
                        printf(catgets(catd, CATSET, 116,
                              "Non-numeric second argument\n"));
                        markall_ret(-1)
                  }
                  other++;
                  if (lexstring[0] == ':') {
                        colresult = evalcol(lexstring[1]);
                        if (colresult == 0) {
                              printf(catgets(catd, CATSET, 117,
                              "Unknown colon modifier \"%s\"\n"),
                                  lexstring);
                              markall_ret(-1)
                        }
                        colmod |= colresult;
                  }
                  else
                        np = add_to_namelist(&namelist, &nmlsize,
                                    np, savestr(lexstring));
                  break;

            case TOPEN:
                  if (imap_search(lexstring, f) == STOP)
                        markall_ret(-1)
                  topen++;
                  break;

            case TDOLLAR:
            case TUP:
            case TDOT:
            case TSEMI:
                  lexnumber = metamess(lexstring[0], f);
                  if (lexnumber == -1)
                        markall_ret(-1)
                  goto number;

            case TBACK:
                  tback = 1;
                  for (i = 1; i <= msgCount; i++) {
                        if (message[i-1].m_flag&MHIDDEN ||
                                    (message[i-1].m_flag&MDELETED)
                                          != f)
                              continue;
                        if (message[i-1].m_flag&MOLDMARK)
                              mark(i, f);
                  }
                  break;

            case TSTAR:
                  if (other) {
                        printf(catgets(catd, CATSET, 118,
                              "Can't mix \"*\" with anything\n"));
                        markall_ret(-1)
                  }
                  star++;
                  break;

            case TCOMMA:
                  if (mb.mb_type == MB_IMAP && gotheaders++ == 0)
                        imap_getheaders(1, msgCount);
                  if (id == NULL && (cp = hfield("in-reply-to", dot))
                              != NULL) {
                        id = savestr(cp);
                        idfield = ID_IN_REPLY_TO;
                  }
                  if (id == NULL && (cp = hfield("references", dot))
                              != NULL) {
                        struct name *np;
                        if ((np = extract(cp, GREF)) != NULL) {
                              while (np->n_flink != NULL)
                                    np = np->n_flink;
                              id = savestr(np->n_name);
                              idfield = ID_REFERENCES;
                        }
                  }
                  if (id == NULL) {
                        printf(catgets(catd, CATSET, 227,
            "Cannot determine parent Message-ID of the current message\n"));
                        markall_ret(-1)
                  }
                  break;

            case TERROR:
                  markall_ret(-1)
            }
            threadflag = 0;
            tok = scan(&bufp);
      }
      lastcolmod = colmod;
      np = add_to_namelist(&namelist, &nmlsize, np, NULL);
      np--;
      mc = 0;
      if (star) {
            for (i = 0; i < msgCount; i++) {
                  if (!(message[i].m_flag & MHIDDEN) &&
                              (message[i].m_flag & MDELETED) == f) {
                        mark(i+1, f);
                        mc++;
                  }
            }
            if (mc == 0) {
                  if (!inhook)
                        printf(catgets(catd, CATSET, 119,
                              "No applicable messages.\n"));
                  markall_ret(-1)
            }
            markall_ret(0)
      }

      if ((topen || tback) && mc == 0) {
            for (i = 0; i < msgCount; i++)
                  if (message[i].m_flag & MMARK)
                        mc++;
            if (mc == 0) {
                  if (!inhook)
                        printf(tback ?
                              "No previously marked messages.\n" :
                              "No messages satify (criteria).\n");
                  markall_ret(-1)
            }
      }

      /*
       * If no numbers were given, mark all of the messages,
       * so that we can unmark any whose sender was not selected
       * if any user names were given.
       */

      if ((np > namelist || colmod != 0 || id) && mc == 0)
            for (i = 1; i <= msgCount; i++) {
                  if (!(message[i-1].m_flag & MHIDDEN) &&
                              (message[i-1].m_flag & MDELETED) == f)
                        mark(i, f);
            }

      /*
       * If any names were given, go through and eliminate any
       * messages whose senders were not requested.
       */

      if (np > namelist || id) {
            int   allnet = value("allnet") != NULL;

            if (mb.mb_type == MB_IMAP && gotheaders++ == 0)
                  imap_getheaders(1, msgCount);
            for (i = 1; i <= msgCount; i++) {
                  mc = 0;
                  if (np > namelist) {
                        for (nq = &namelist[0]; *nq != NULL; nq++) {
                              if (**nq == '/') {
                                    if (matchsubj(*nq, i)) {
                                          mc++;
                                          break;
                                    }
                              }
                              else {
                                    if (matchsender(*nq, i,
                                                allnet)) {
                                          mc++;
                                          break;
                                    }
                              }
                        }
                  }
                  if (mc == 0 && id && matchmid(id, idfield, i))
                        mc++;
                  if (mc == 0)
                        unmark(i);
            }

            /*
             * Make sure we got some decent messages.
             */

            mc = 0;
            for (i = 1; i <= msgCount; i++)
                  if (message[i-1].m_flag & MMARK) {
                        mc++;
                        break;
                  }
            if (mc == 0) {
                  if (!inhook && np > namelist) {
                        printf(catgets(catd, CATSET, 120,
                              "No applicable messages from {%s"),
                              namelist[0]);
                        for (nq = &namelist[1]; *nq != NULL; nq++)
                              printf(catgets(catd, CATSET, 121,
                                                ", %s"), *nq);
                        printf(catgets(catd, CATSET, 122, "}\n"));
                  } else if (id) {
                        printf(catgets(catd, CATSET, 227,
                              "Parent message not found\n"));
                  }
                  markall_ret(-1)
            }
      }

      /*
       * If any colon modifiers were given, go through and
       * unmark any messages which do not satisfy the modifiers.
       */

      if (colmod != 0) {
            for (i = 1; i <= msgCount; i++) {
                  struct coltab *colp;

                  mp = &message[i - 1];
                  for (colp = &coltab[0]; colp->co_char; colp++)
                        if (colp->co_bit & colmod)
                              if ((mp->m_flag & colp->co_mask)
                                  != colp->co_equal)
                                    unmark(i);
                  
            }
            for (mp = &message[0]; mp < &message[msgCount]; mp++)
                  if (mp->m_flag & MMARK)
                        break;
            if (mp >= &message[msgCount]) {
                  struct coltab *colp;

                  if (!inhook) {
                        printf(catgets(catd, CATSET, 123,
                                    "No messages satisfy"));
                        for (colp = &coltab[0]; colp->co_char; colp++)
                              if (colp->co_bit & colmod)
                                    printf(" :%c", colp->co_char);
                        printf("\n");
                  }
                  markall_ret(-1)
            }
      }
      markall_ret(0)
out:
      free(namelist);
      return retval;
}

/*
 * Turn the character after a colon modifier into a bit
 * value.
 */
static int 
evalcol(int col)
{
      struct coltab *colp;

      if (col == 0)
            return(lastcolmod);
      for (colp = &coltab[0]; colp->co_char; colp++)
            if (colp->co_char == col)
                  return(colp->co_bit);
      return(0);
}

/*
 * Check the passed message number for legality and proper flags.
 * If f is MDELETED, then either kind will do.  Otherwise, the message
 * has to be undeleted.
 */
static int 
check(int mesg, int f)
{
      struct message *mp;

      if (mesg < 1 || mesg > msgCount) {
            printf(catgets(catd, CATSET, 124,
                  "%d: Invalid message number\n"), mesg);
            return(-1);
      }
      mp = &message[mesg-1];
      if (mp->m_flag & MHIDDEN || (f != MDELETED &&
                        (mp->m_flag & MDELETED) != 0)) {
            printf(catgets(catd, CATSET, 125,
                  "%d: Inappropriate message\n"), mesg);
            return(-1);
      }
      return(0);
}

/*
 * Scan out the list of string arguments, shell style
 * for a RAWLIST.
 */
int
getrawlist(const char *line, size_t linesize, char **argv, int argc,
            int echolist)
{
      char c, *cp2, quotec;
      const char  *cp;
      int argn;
      char *linebuf;

      argn = 0;
      cp = line;
      linebuf = ac_alloc(linesize + 1);
      for (;;) {
            for (; blankchar(*cp & 0377); cp++);
            if (*cp == '\0')
                  break;
            if (argn >= argc - 1) {
                  printf(catgets(catd, CATSET, 126,
                  "Too many elements in the list; excess discarded.\n"));
                  break;
            }
            cp2 = linebuf;
            quotec = '\0';
            while ((c = *cp) != '\0') {
                  cp++;
                  if (quotec != '\0') {
                        if (c == quotec) {
                              quotec = '\0';
                              if (echolist)
                                    *cp2++ = c;
                        } else if (c == '\\')
                              switch (c = *cp++) {
                              case '\0':
                                    *cp2++ = '\\';
                                    cp--;
                                    break;
                              /*
                              case '0': case '1': case '2': case '3':
                              case '4': case '5': case '6': case '7':
                                    c -= '0';
                                    if (*cp >= '0' && *cp <= '7')
                                          c = c * 8 + *cp++ - '0';
                                    if (*cp >= '0' && *cp <= '7')
                                          c = c * 8 + *cp++ - '0';
                                    *cp2++ = c;
                                    break;
                              case 'b':
                                    *cp2++ = '\b';
                                    break;
                              case 'f':
                                    *cp2++ = '\f';
                                    break;
                              case 'n':
                                    *cp2++ = '\n';
                                    break;
                              case 'r':
                                    *cp2++ = '\r';
                                    break;
                              case 't':
                                    *cp2++ = '\t';
                                    break;
                              case 'v':
                                    *cp2++ = '\v';
                                    break;
                              */
                              default:
                                    if (cp[-1]!=quotec || echolist)
                                          *cp2++ = '\\';
                                    *cp2++ = c;
                              }
                        /*else if (c == '^') {
                              c = *cp++;
                              if (c == '?')
                                    *cp2++ = '\177';
                              /\* null doesn't show up anyway *\/
                              else if ((c >= 'A' && c <= '_') ||
                                     (c >= 'a' && c <= 'z'))
                                    *cp2++ = c & 037;
                              else {
                                    *cp2++ = '^';
                                    cp--;
                              }
                        }*/ else
                              *cp2++ = c;
                  } else if (c == '"' || c == '\'') {
                        if (echolist)
                              *cp2++ = c;
                        quotec = c;
                  } else if (c == '\\' && !echolist) {
                        if (*cp)
                              *cp2++ = *cp++;
                        else
                              *cp2++ = c;
                  } else if (blankchar(c & 0377))
                        break;
                  else
                        *cp2++ = c;
            }
            *cp2 = '\0';
            argv[argn++] = savestr(linebuf);
      }
      argv[argn] = NULL;
      ac_free(linebuf);
      return argn;
}

/*
 * scan out a single lexical item and return its token number,
 * updating the string pointer passed **p.  Also, store the value
 * of the number or string scanned in lexnumber or lexstring as
 * appropriate.  In any event, store the scanned `thing' in lexstring.
 */

static struct lex {
      char  l_char;
      enum ltoken l_token;
} singles[] = {
      { '$',      TDOLLAR },
      { '.',      TDOT },
      { '^',      TUP },
      { '*',      TSTAR },
      { '-',      TDASH },
      { '+',      TPLUS },
      { '(',      TOPEN },
      { ')',      TCLOSE },
      { ',',      TCOMMA },
      { ';',      TSEMI },
      { '`',      TBACK },
      { 0,  0 }
};

static int 
scan(char **sp)
{
      char *cp, *cp2;
      int c, level, inquote;
      struct lex *lp;
      int quotec;

      if (regretp >= 0) {
            strncpy(lexstring, string_stack[regretp], STRINGLEN);
            lexstring[STRINGLEN-1]='\0';
            lexnumber = numberstack[regretp];
            return(regretstack[regretp--]);
      }
      cp = *sp;
      cp2 = lexstring;
      c = *cp++;

      /*
       * strip away leading white space.
       */

      while (blankchar(c))
            c = *cp++;

      /*
       * If no characters remain, we are at end of line,
       * so report that.
       */

      if (c == '\0') {
            *sp = --cp;
            return(TEOL);
      }

      /*
       * Select members of a message thread.
       */
      if (c == '&') {
            threadflag = 1;
            if (*cp == '\0' || spacechar(*cp&0377)) {
                  lexstring[0] = '.';
                  lexstring[1] = '\0';
                  *sp = cp;
                  return TDOT;
            }
            c = *cp++;
      }

      /*
       * If the leading character is a digit, scan
       * the number and convert it on the fly.
       * Return TNUMBER when done.
       */

      if (digitchar(c)) {
            lexnumber = 0;
            while (digitchar(c)) {
                  lexnumber = lexnumber*10 + c - '0';
                  *cp2++ = c;
                  c = *cp++;
            }
            *cp2 = '\0';
            *sp = --cp;
            return(TNUMBER);
      }

      /*
       * An IMAP SEARCH list. Note that TOPEN has always been included
       * in singles[] in Mail and mailx. Thus although there is no formal
       * definition for (LIST) lists, they do not collide with historical
       * practice because a subject string (LIST) could never been matched
       * this way.
       */

      if (c == '(') {
            level = 1;
            inquote = 0;
            *cp2++ = c;
            do {
                  if ((c = *cp++&0377) == '\0') {
                  mtop: fprintf(stderr, "Missing \")\".\n");
                        return TERROR;
                  }
                  if (inquote && c == '\\') {
                        *cp2++ = c;
                        c = *cp++&0377;
                        if (c == '\0')
                              goto mtop;
                  } else if (c == '"')
                        inquote = !inquote;
                  else if (inquote)
                        /*EMPTY*/;
                  else if (c == '(')
                        level++;
                  else if (c == ')')
                        level--;
                  else if (spacechar(c)) {
                        /*
                         * Replace unquoted whitespace by single
                         * space characters, to make the string
                         * IMAP SEARCH conformant.
                         */
                        c = ' ';
                        if (cp2[-1] == ' ')
                              cp2--;
                  }
                  *cp2++ = c;
            } while (c != ')' || level > 0);
            *cp2 = '\0';
            *sp = cp;
            return TOPEN;
      }

      /*
       * Check for single character tokens; return such
       * if found.
       */

      for (lp = &singles[0]; lp->l_char != 0; lp++)
            if (c == lp->l_char) {
                  lexstring[0] = c;
                  lexstring[1] = '\0';
                  *sp = cp;
                  return(lp->l_token);
            }

      /*
       * We've got a string!  Copy all the characters
       * of the string into lexstring, until we see
       * a null, space, or tab.
       * If the lead character is a " or ', save it
       * and scan until you get another.
       */

      quotec = 0;
      if (c == '\'' || c == '"') {
            quotec = c;
            c = *cp++;
      }
      while (c != '\0') {
            if (quotec == 0 && c == '\\' && *cp)
                  c = *cp++;
            if (c == quotec) {
                  cp++;
                  break;
            }
            if (quotec == 0 && blankchar(c))
                  break;
            if (cp2 - lexstring < STRINGLEN-1)
                  *cp2++ = c;
            c = *cp++;
      }
      if (quotec && c == 0) {
            fprintf(stderr, catgets(catd, CATSET, 127,
                        "Missing %c\n"), quotec);
            return TERROR;
      }
      *sp = --cp;
      *cp2 = '\0';
      return(TSTRING);
}

/*
 * Unscan the named token by pushing it onto the regret stack.
 */
static void 
regret(int token)
{
      if (++regretp >= REGDEP)
            panic(catgets(catd, CATSET, 128, "Too many regrets"));
      regretstack[regretp] = token;
      lexstring[STRINGLEN-1] = '\0';
      string_stack[regretp] = savestr(lexstring);
      numberstack[regretp] = lexnumber;
}

/*
 * Reset all the scanner global variables.
 */
static void 
scaninit(void)
{
      regretp = -1;
      threadflag = 0;
}

/*
 * Find the first message whose flags & m == f  and return
 * its message number.
 */
int 
first(int f, int m)
{
      struct message *mp;

      if (msgCount == 0)
            return 0;
      f &= MDELETED;
      m &= MDELETED;
      for (mp = dot; mb.mb_threaded ? mp != NULL : mp < &message[msgCount];
                  mb.mb_threaded ? mp = next_in_thread(mp) : mp++) {
            if (!(mp->m_flag & MHIDDEN) && (mp->m_flag & m) == f)
                  return mp - message + 1;
      }
      if (dot > &message[0]) {
            for (mp = dot-1; mb.mb_threaded ?
                              mp != NULL : mp >= &message[0];
                        mb.mb_threaded ?
                              mp = prev_in_thread(mp) : mp--) {
                  if (!(mp->m_flag & MHIDDEN) && (mp->m_flag & m) == f)
                        return mp - message + 1;
            }
      }
      return 0;
}

/*
 * See if the passed name sent the passed message number.  Return true
 * if so.
 */
static int 
matchsender(char *str, int mesg, int allnet)
{
      if (allnet) {
            char *cp = nameof(&message[mesg - 1], 0);

            do {
                  if ((*cp == '@' || *cp == '\0') &&
                              (*str == '@' || *str == '\0'))
                        return 1;
                  if (*cp != *str)
                        break;
            } while (cp++, *str++ != '\0');
            return 0;
      }
      return !strcmp(str, (value("showname") ? realname : skin)
                  (name1(&message[mesg - 1], 0)));
}

static int 
matchmid(char *id, enum idfield idfield, int mesg)
{
      struct name *np;
      char *cp;

      if ((cp = hfield("message-id", &message[mesg - 1])) != NULL) {
            switch (idfield) {
            case ID_REFERENCES:
                  return msgidcmp(id, cp) == 0;
            case ID_IN_REPLY_TO:
                  if ((np = extract(id, GREF)) != NULL)
                        do {
                              if (msgidcmp(np->n_name, cp) == 0)
                                    return 1;
                        } while ((np = np->n_flink) != NULL);
                  break;
            }
      }
      return 0;
}

/*
 * See if the given string matches inside the subject field of the
 * given message.  For the purpose of the scan, we ignore case differences.
 * If it does, return true.  The string search argument is assumed to
 * have the form "/search-string."  If it is of the form "/," we use the
 * previous search string.
 */

static char lastscan[128];

static int 
matchsubj(char *str, int mesg)
{
      struct message *mp;
      char *cp, *cp2;
      struct str in, out;
      int   i;

      str++;
      if (strlen(str) == 0) {
            str = lastscan;
      } else {
            strncpy(lastscan, str, sizeof lastscan);
            lastscan[sizeof lastscan - 1]='\0';
      }
      mp = &message[mesg-1];
      
      /*
       * Now look, ignoring case, for the word in the string.
       */

      if (value("searchheaders") && (cp = strchr(str, ':'))) {
            *cp++ = '\0';
            cp2 = hfield(str, mp);
            cp[-1] = ':';
            str = cp;
      } else {
            cp = str;
            cp2 = hfield("subject", mp);
      }
      if (cp2 == NULL)
            return(0);
      in.s = cp2;
      in.l = strlen(cp2);
      mime_fromhdr(&in, &out, TD_ICONV);
      i = substr(out.s, cp);
      free(out.s);
      return i;
}

/*
 * Mark the named message by setting its mark bit.
 */
void 
mark(int mesg, int f)
{
      struct message    *mp;
      int i;

      i = mesg;
      if (i < 1 || i > msgCount)
            panic(catgets(catd, CATSET, 129, "Bad message number to mark"));
      if (mb.mb_threaded == 1 && threadflag) {
            if ((message[i-1].m_flag & MHIDDEN) == 0) {
                  if (f == MDELETED ||
                              (message[i-1].m_flag&MDELETED) == 0)
                  message[i-1].m_flag |= MMARK;
            }
            if (message[i-1].m_child) {
                  mp = message[i-1].m_child;
                  mark(mp-message+1, f);
                  for (mp = mp->m_younger; mp; mp = mp->m_younger)
                        mark(mp-message+1, f);
            }
      } else
            message[i-1].m_flag |= MMARK;
}

/*
 * Unmark the named message.
 */
static void 
unmark(int mesg)
{
      int i;

      i = mesg;
      if (i < 1 || i > msgCount)
            panic(catgets(catd, CATSET, 130,
                              "Bad message number to unmark"));
      message[i-1].m_flag &= ~MMARK;
}

/*
 * Return the message number corresponding to the passed meta character.
 */
static int 
metamess(int meta, int f)
{
      int c, m;
      struct message *mp;

      c = meta;
      switch (c) {
      case '^':
            /*
             * First 'good' message left.
             */
            mp = mb.mb_threaded ? threadroot : &message[0];
            while (mp < &message[msgCount]) {
                  if (!(mp->m_flag & (MHIDDEN|MKILL)) &&
                              (mp->m_flag & MDELETED) == f)
                        return(mp - &message[0] + 1);
                  if (mb.mb_threaded) {
                        mp = next_in_thread(mp);
                        if (mp == NULL)
                              break;
                  } else
                        mp++;
            }
            if (!inhook)
                  printf(catgets(catd, CATSET, 131,
                                    "No applicable messages\n"));
            return(-1);

      case '$':
            /*
             * Last 'good message left.
             */
            mp = mb.mb_threaded ? this_in_thread(threadroot, -1) :
                  &message[msgCount-1];
            while (mp >= &message[0]) {
                  if (!(mp->m_flag & (MHIDDEN|MKILL)) &&
                              (mp->m_flag & MDELETED) == f)
                        return(mp - &message[0] + 1);
                  if (mb.mb_threaded) {
                        mp = prev_in_thread(mp);
                        if (mp == NULL)
                              break;
                  } else
                        mp--;
            }
            if (!inhook)
                  printf(catgets(catd, CATSET, 132,
                                    "No applicable messages\n"));
            return(-1);

      case '.':
            /* 
             * Current message.
             */
            m = dot - &message[0] + 1;
            if (dot->m_flag & MHIDDEN || (dot->m_flag & MDELETED) != f) {
                  printf(catgets(catd, CATSET, 133,
                        "%d: Inappropriate message\n"), m);
                  return(-1);
            }
            return(m);

      case ';':
            /*
             * Previously current message.
             */
            if (prevdot == NULL) {
                  printf(catgets(catd, CATSET, 228,
                        "No previously current message\n"));
                  return(-1);
            }
            m = prevdot - &message[0] + 1;
            if (prevdot->m_flag&MHIDDEN || (prevdot->m_flag&MDELETED)!=f) {
                  printf(catgets(catd, CATSET, 133,
                        "%d: Inappropriate message\n"), m);
                  return(-1);
            }
            return(m);

      default:
            printf(catgets(catd, CATSET, 134,
                        "Unknown metachar (%c)\n"), c);
            return(-1);
      }
}

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