usr.bin/mail/list.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)list.c   8.4 (Berkeley) 5/1/95
  30  * $FreeBSD: src/usr.bin/mail/list.c,v 1.2.12.3 2003/01/06 05:46:03 mikeh Exp $
  31  * $DragonFly: src/usr.bin/mail/list.c,v 1.5 2004/09/08 03:01:11 joerg Exp $
  32  */
  33
  34 #include "rcv.h"
  35 #include <ctype.h>
  36 #include "extern.h"
  37
  38 static void      mark(int);
  39 static void      unmark(int);
  40
  41 /*
  42  * Mail -- a mail program
  43  *
  44  * Message list handling.
  45  */
  46
  47 /*
  48  * Convert the user string of message numbers and
  49  * store the numbers into vector.
  50  *
  51  * Returns the count of messages picked up or -1 on error.
  52  */
  53 int
  54 getmsglist(char *buf, int *vector, int flags)
  55 {
  56         int *ip;
  57         struct message *mp;
  58
  59         if (msgCount == 0) {
  60                 *vector = 0;
  61                 return (0);
  62         }
  63         if (markall(buf, flags) < 0)
  64                 return (-1);
  65         ip = vector;
  66         for (mp = &message[0]; mp < &message[msgCount]; mp++)
  67                 if (mp->m_flag & MMARK)
  68                         *ip++ = mp - &message[0] + 1;
  69         *ip = 0;
  70         return (ip - vector);
  71 }
  72
  73 /*
  74  * Mark all messages that the user wanted from the command
  75  * line in the message structure.  Return 0 on success, -1
  76  * on error.
  77  */
  78
  79 /*
  80  * Bit values for colon modifiers.
  81  */
  82
  83 #define CMNEW           01              /* New messages */
  84 #define CMOLD           02              /* Old messages */
  85 #define CMUNREAD        04              /* Unread messages */
  86 #define CMDELETED       010             /* Deleted messages */
  87 #define CMREAD          020             /* Read messages */
  88
  89 /*
  90  * The following table describes the letters which can follow
  91  * the colon and gives the corresponding modifier bit.
  92  */
  93
  94 struct coltab {
  95         char    co_char;                /* What to find past : */
  96         int     co_bit;                 /* Associated modifier bit */
  97         int     co_mask;                /* m_status bits to mask */
  98         int     co_equal;               /* ... must equal this */
  99 } coltab[] = {
 100         { 'n',          CMNEW,          MNEW,           MNEW    },
 101         { 'o',          CMOLD,          MNEW,           0       },
 102         { 'u',          CMUNREAD,       MREAD,          0       },
 103         { 'd',          CMDELETED,      MDELETED,       MDELETED},
 104         { 'r',          CMREAD,         MREAD,          MREAD   },
 105         { 0,            0,              0,              0       }
 106 };
 107
 108 static  int     lastcolmod;
 109
 110 int
 111 markall(char *buf, int f)
 112 {
 113         char **np;
 114         int i;
 115         struct message *mp;
 116         char *namelist[NMLSIZE], *bufp;
 117         int tok, beg, mc, star, other, valdot, colmod, colresult;
 118
 119         valdot = dot - &message[0] + 1;
 120         colmod = 0;
 121         for (i = 1; i <= msgCount; i++)
 122                 unmark(i);
 123         bufp = buf;
 124         mc = 0;
 125         np = &namelist[0];
 126         scaninit();
 127         tok = scan(&bufp);
 128         star = 0;
 129         other = 0;
 130         beg = 0;
 131         while (tok != TEOL) {
 132                 switch (tok) {
 133                 case TNUMBER:
 134 number:
 135                         if (star) {
 136                                 printf("No numbers mixed with *\n");
 137                                 return (-1);
 138                         }
 139                         mc++;
 140                         other++;
 141                         if (beg != 0) {
 142                                 if (check(lexnumber, f))
 143                                         return (-1);
 144                                 for (i = beg; i <= lexnumber; i++)
 145                                         if (f == MDELETED || (message[i - 1].m_flag & MDELETED) == 0)
 146                                                 mark(i);
 147                                 beg = 0;
 148                                 break;
 149                         }
 150                         beg = lexnumber;
 151                         if (check(beg, f))
 152                                 return (-1);
 153                         tok = scan(&bufp);
 154                         regret(tok);
 155                         if (tok != TDASH) {
 156                                 mark(beg);
 157                                 beg = 0;
 158                         }
 159                         break;
 160
 161                 case TPLUS:
 162                         if (beg != 0) {
 163                                 printf("Non-numeric second argument\n");
 164                                 return (-1);
 165                         }
 166                         i = valdot;
 167                         do {
 168                                 i++;
 169                                 if (i > msgCount) {
 170                                         printf("Referencing beyond EOF\n");
 171                                         return (-1);
 172                                 }
 173                         } while ((message[i - 1].m_flag & MDELETED) != f);
 174                         mark(i);
 175                         break;
 176
 177                 case TDASH:
 178                         if (beg == 0) {
 179                                 i = valdot;
 180                                 do {
 181                                         i--;
 182                                         if (i <= 0) {
 183                                                 printf("Referencing before 1\n");
 184                                                 return (-1);
 185                                         }
 186                                 } while ((message[i - 1].m_flag & MDELETED) != f);
 187                                 mark(i);
 188                         }
 189                         break;
 190
 191                 case TSTRING:
 192                         if (beg != 0) {
 193                                 printf("Non-numeric second argument\n");
 194                                 return (-1);
 195                         }
 196                         other++;
 197                         if (lexstring[0] == ':') {
 198                                 colresult = evalcol(lexstring[1]);
 199                                 if (colresult == 0) {
 200                                         printf("Unknown colon modifier \"%s\"\n",
 201                                             lexstring);
 202                                         return (-1);
 203                                 }
 204                                 colmod |= colresult;
 205                         }
 206                         else
 207                                 *np++ = savestr(lexstring);
 208                         break;
 209
 210                 case TDOLLAR:
 211                 case TUP:
 212                 case TDOT:
 213                         lexnumber = metamess(lexstring[0], f);
 214                         if (lexnumber == -1)
 215                                 return (-1);
 216                         goto number;
 217
 218                 case TSTAR:
 219                         if (other) {
 220                                 printf("Can't mix \"*\" with anything\n");
 221                                 return (-1);
 222                         }
 223                         star++;
 224                         break;
 225
 226                 case TERROR:
 227                         return (-1);
 228                 }
 229                 tok = scan(&bufp);
 230         }
 231         lastcolmod = colmod;
 232         *np = NULL;
 233         mc = 0;
 234         if (star) {
 235                 for (i = 0; i < msgCount; i++)
 236                         if ((message[i].m_flag & MDELETED) == f) {
 237                                 mark(i+1);
 238                                 mc++;
 239                         }
 240                 if (mc == 0) {
 241                         printf("No applicable messages.\n");
 242                         return (-1);
 243                 }
 244                 return (0);
 245         }
 246
 247         /*
 248          * If no numbers were given, mark all of the messages,
 249          * so that we can unmark any whose sender was not selected
 250          * if any user names were given.
 251          */
 252
 253         if ((np > namelist || colmod != 0) && mc == 0)
 254                 for (i = 1; i <= msgCount; i++)
 255                         if ((message[i-1].m_flag & MDELETED) == f)
 256                                 mark(i);
 257
 258         /*
 259          * If any names were given, go through and eliminate any
 260          * messages whose senders were not requested.
 261          */
 262
 263         if (np > namelist) {
 264                 for (i = 1; i <= msgCount; i++) {
 265                         for (mc = 0, np = &namelist[0]; *np != NULL; np++)
 266                                 if (**np == '/') {
 267                                         if (matchfield(*np, i)) {
 268                                                 mc++;
 269                                                 break;
 270                                         }
 271                                 }
 272                                 else {
 273                                         if (matchsender(*np, i)) {
 274                                                 mc++;
 275                                                 break;
 276                                         }
 277                                 }
 278                         if (mc == 0)
 279                                 unmark(i);
 280                 }
 281
 282                 /*
 283                  * Make sure we got some decent messages.
 284                  */
 285
 286                 mc = 0;
 287                 for (i = 1; i <= msgCount; i++)
 288                         if (message[i-1].m_flag & MMARK) {
 289                                 mc++;
 290                                 break;
 291                         }
 292                 if (mc == 0) {
 293                         printf("No applicable messages from {%s",
 294                                 namelist[0]);
 295                         for (np = &namelist[1]; *np != NULL; np++)
 296                                 printf(", %s", *np);
 297                         printf("}\n");
 298                         return (-1);
 299                 }
 300         }
 301
 302         /*
 303          * If any colon modifiers were given, go through and
 304          * unmark any messages which do not satisfy the modifiers.
 305          */
 306
 307         if (colmod != 0) {
 308                 for (i = 1; i <= msgCount; i++) {
 309                         struct coltab *colp;
 310
 311                         mp = &message[i - 1];
 312                         for (colp = &coltab[0]; colp->co_char != '\0'; colp++)
 313                                 if (colp->co_bit & colmod)
 314                                         if ((mp->m_flag & colp->co_mask)
 315                                             != colp->co_equal)
 316                                                 unmark(i);
 317
 318                 }
 319                 for (mp = &message[0]; mp < &message[msgCount]; mp++)
 320                         if (mp->m_flag & MMARK)
 321                                 break;
 322                 if (mp >= &message[msgCount]) {
 323                         struct coltab *colp;
 324
 325                         printf("No messages satisfy");
 326                         for (colp = &coltab[0]; colp->co_char != '\0'; colp++)
 327                                 if (colp->co_bit & colmod)
 328                                         printf(" :%c", colp->co_char);
 329                         printf("\n");
 330                         return (-1);
 331                 }
 332         }
 333         return (0);
 334 }
 335
 336 /*
 337  * Turn the character after a colon modifier into a bit
 338  * value.
 339  */
 340 int
 341 evalcol(int col)
 342 {
 343         struct coltab *colp;
 344
 345         if (col == 0)
 346                 return (lastcolmod);
 347         for (colp = &coltab[0]; colp->co_char != '\0'; colp++)
 348                 if (colp->co_char == col)
 349                         return (colp->co_bit);
 350         return (0);
 351 }
 352
 353 /*
 354  * Check the passed message number for legality and proper flags.
 355  * If f is MDELETED, then either kind will do.  Otherwise, the message
 356  * has to be undeleted.
 357  */
 358 int
 359 check(int mesg, int f)
 360 {
 361         struct message *mp;
 362
 363         if (mesg < 1 || mesg > msgCount) {
 364                 printf("%d: Invalid message number\n", mesg);
 365                 return (-1);
 366         }
 367         mp = &message[mesg-1];
 368         if (f != MDELETED && (mp->m_flag & MDELETED) != 0) {
 369                 printf("%d: Inappropriate message\n", mesg);
 370                 return (-1);
 371         }
 372         return (0);
 373 }
 374
 375 /*
 376  * Scan out the list of string arguments, shell style
 377  * for a RAWLIST.
 378  */
 379 int
 380 getrawlist(char *line, char **argv, int argc)
 381 {
 382         char c, *cp, *cp2, quotec;
 383         int argn;
 384         char *linebuf;
 385         size_t linebufsize = BUFSIZ;
 386
 387         if ((linebuf = malloc(linebufsize)) == NULL)
 388                 err(1, "Out of memory");
 389
 390         argn = 0;
 391         cp = line;
 392         for (;;) {
 393                 for (; *cp == ' ' || *cp == '\t'; cp++)
 394                         ;
 395                 if (*cp == '\0')
 396                         break;
 397                 if (argn >= argc - 1) {
 398                         printf(
 399                         "Too many elements in the list; excess discarded.\n");
 400                         break;
 401                 }
 402                 cp2 = linebuf;
 403                 quotec = '\0';
 404                 while ((c = *cp) != '\0') {
 405                         /* Allocate more space if necessary */
 406                         if (cp2 - linebuf == linebufsize - 1) {
 407                                 linebufsize += BUFSIZ;
 408                                 if ((linebuf = realloc(linebuf, linebufsize)) == NULL)
 409                                         err(1, "Out of memory");
 410                                 cp2 = linebuf + linebufsize - BUFSIZ - 1;
 411                         }
 412                         cp++;
 413                         if (quotec != '\0') {
 414                                 if (c == quotec)
 415                                         quotec = '\0';
 416                                 else if (c == '\\')
 417                                         switch (c = *cp++) {
 418                                         case '\0':
 419                                                 *cp2++ = '\\';
 420                                                 cp--;
 421                                                 break;
 422                                         case '0': case '1': case '2': case '3':
 423                                         case '4': case '5': case '6': case '7':
 424                                                 c -= '0';
 425                                                 if (*cp >= '0' && *cp <= '7')
 426                                                         c = c * 8 + *cp++ - '0';
 427                                                 if (*cp >= '0' && *cp <= '7')
 428                                                         c = c * 8 + *cp++ - '0';
 429                                                 *cp2++ = c;
 430                                                 break;
 431                                         case 'b':
 432                                                 *cp2++ = '\b';
 433                                                 break;
 434                                         case 'f':
 435                                                 *cp2++ = '\f';
 436                                                 break;
 437                                         case 'n':
 438                                                 *cp2++ = '\n';
 439                                                 break;
 440                                         case 'r':
 441                                                 *cp2++ = '\r';
 442                                                 break;
 443                                         case 't':
 444                                                 *cp2++ = '\t';
 445                                                 break;
 446                                         case 'v':
 447                                                 *cp2++ = '\v';
 448                                                 break;
 449                                         default:
 450                                                 *cp2++ = c;
 451                                         }
 452                                 else if (c == '^') {
 453                                         c = *cp++;
 454                                         if (c == '?')
 455                                                 *cp2++ = '\177';
 456                                         /* null doesn't show up anyway */
 457                                         else if ((c >= 'A' && c <= '_') ||
 458                                             (c >= 'a' && c <= 'z'))
 459                                                 *cp2++ = c & 037;
 460                                         else {
 461                                                 *cp2++ = '^';
 462                                                 cp--;
 463                                         }
 464                                 } else
 465                                         *cp2++ = c;
 466                         } else if (c == '"' || c == '\'')
 467                                 quotec = c;
 468                         else if (c == ' ' || c == '\t')
 469                                 break;
 470                         else
 471                                 *cp2++ = c;
 472                 }
 473                 *cp2 = '\0';
 474                 argv[argn++] = savestr(linebuf);
 475         }
 476         argv[argn] = NULL;
 477         free(linebuf);
 478         return (argn);
 479 }
 480
 481 /*
 482  * scan out a single lexical item and return its token number,
 483  * updating the string pointer passed **p.  Also, store the value
 484  * of the number or string scanned in lexnumber or lexstring as
 485  * appropriate.  In any event, store the scanned `thing' in lexstring.
 486  */
 487
 488 struct lex {
 489         char    l_char;
 490         char    l_token;
 491 } singles[] = {
 492         { '$',  TDOLLAR },
 493         { '.',  TDOT    },
 494         { '^',  TUP     },
 495         { '*',  TSTAR   },
 496         { '-',  TDASH   },
 497         { '+',  TPLUS   },
 498         { '(',  TOPEN   },
 499         { ')',  TCLOSE  },
 500         { 0,    0       }
 501 };
 502
 503 int
 504 scan(char **sp)
 505 {
 506         char *cp, *cp2;
 507         int c;
 508         struct lex *lp;
 509         int quotec;
 510
 511         if (regretp >= 0) {
 512                 strcpy(lexstring, string_stack[regretp]);
 513                 lexnumber = numberstack[regretp];
 514                 return (regretstack[regretp--]);
 515         }
 516         cp = *sp;
 517         cp2 = lexstring;
 518         c = *cp++;
 519
 520         /*
 521          * strip away leading white space.
 522          */
 523
 524         while (c == ' ' || c == '\t')
 525                 c = *cp++;
 526
 527         /*
 528          * If no characters remain, we are at end of line,
 529          * so report that.
 530          */
 531
 532         if (c == '\0') {
 533                 *sp = --cp;
 534                 return (TEOL);
 535         }
 536
 537         /*
 538          * If the leading character is a digit, scan
 539          * the number and convert it on the fly.
 540          * Return TNUMBER when done.
 541          */
 542
 543         if (isdigit((unsigned char)c)) {
 544                 lexnumber = 0;
 545                 while (isdigit((unsigned char)c)) {
 546                         lexnumber = lexnumber*10 + c - '0';
 547                         *cp2++ = c;
 548                         c = *cp++;
 549                 }
 550                 *cp2 = '\0';
 551                 *sp = --cp;
 552                 return (TNUMBER);
 553         }
 554
 555         /*
 556          * Check for single character tokens; return such
 557          * if found.
 558          */
 559
 560         for (lp = &singles[0]; lp->l_char != '\0'; lp++)
 561                 if (c == lp->l_char) {
 562                         lexstring[0] = c;
 563                         lexstring[1] = '\0';
 564                         *sp = cp;
 565                         return (lp->l_token);
 566                 }
 567
 568         /*
 569          * We've got a string!  Copy all the characters
 570          * of the string into lexstring, until we see
 571          * a null, space, or tab.
 572          * If the lead character is a " or ', save it
 573          * and scan until you get another.
 574          */
 575
 576         quotec = 0;
 577         if (c == '\'' || c == '"') {
 578                 quotec = c;
 579                 c = *cp++;
 580         }
 581         while (c != '\0') {
 582                 if (c == quotec) {
 583                         cp++;
 584                         break;
 585                 }
 586                 if (quotec == 0 && (c == ' ' || c == '\t'))
 587                         break;
 588                 if (cp2 - lexstring < STRINGLEN-1)
 589                         *cp2++ = c;
 590                 c = *cp++;
 591         }
 592         if (quotec && c == '\0') {
 593                 fprintf(stderr, "Missing %c\n", quotec);
 594                 return (TERROR);
 595         }
 596         *sp = --cp;
 597         *cp2 = '\0';
 598         return (TSTRING);
 599 }
 600
 601 /*
 602  * Unscan the named token by pushing it onto the regret stack.
 603  */
 604 void
 605 regret(int token)
 606 {
 607         if (++regretp >= REGDEP)
 608                 errx(1, "Too many regrets");
 609         regretstack[regretp] = token;
 610         lexstring[STRINGLEN-1] = '\0';
 611         string_stack[regretp] = savestr(lexstring);
 612         numberstack[regretp] = lexnumber;
 613 }
 614
 615 /*
 616  * Reset all the scanner global variables.
 617  */
 618 void
 619 scaninit(void)
 620 {
 621         regretp = -1;
 622 }
 623
 624 /*
 625  * Find the first message whose flags & m == f  and return
 626  * its message number.
 627  */
 628 int
 629 first(int f, int m)
 630 {
 631         struct message *mp;
 632
 633         if (msgCount == 0)
 634                 return (0);
 635         f &= MDELETED;
 636         m &= MDELETED;
 637         for (mp = dot; mp < &message[msgCount]; mp++)
 638                 if ((mp->m_flag & m) == f)
 639                         return (mp - message + 1);
 640         for (mp = dot-1; mp >= &message[0]; mp--)
 641                 if ((mp->m_flag & m) == f)
 642                         return (mp - message + 1);
 643         return (0);
 644 }
 645
 646 /*
 647  * See if the passed name sent the passed message number.  Return true
 648  * if so.
 649  */
 650 int
 651 matchsender(char *str, int mesg)
 652 {
 653         char *cp;
 654
 655         /* null string matches nothing instead of everything */
 656         if (*str == '\0')
 657                 return (0);
 658
 659         cp = nameof(&message[mesg - 1], 0);
 660         return (strcasestr(cp, str) != NULL);
 661 }
 662
 663 /*
 664  * See if the passed name received the passed message number.  Return true
 665  * if so.
 666  */
 667
 668 static char *to_fields[] = { "to", "cc", "bcc", NULL };
 669
 670 int
 671 matchto(char *str, int mesg)
 672 {
 673         struct message *mp;
 674         char *cp, **to;
 675
 676         str++;
 677
 678         /* null string matches nothing instead of everything */
 679         if (*str == '\0')
 680                 return (0);
 681
 682         mp = &message[mesg - 1];
 683
 684         for (to = to_fields; *to != NULL; to++) {
 685                 cp = hfield(*to, mp);
 686                 if (cp != NULL && strcasestr(cp, str) != NULL)
 687                         return (1);
 688         }
 689         return (0);
 690 }
 691
 692 /*
 693  * See if the given substring is contained within the specified field. If
 694  * 'searchheaders' is set, then the form '/x:y' will be accepted and matches
 695  * any message with the substring 'y' in field 'x'. If 'x' is omitted or
 696  * 'searchheaders' is not set, then the search matches any messages
 697  * with the substring 'y' in the 'Subject'. The search is case insensitive.
 698  *
 699  * The form '/to:y' is a special case, and will match all messages
 700  * containing the substring 'y' in the 'To', 'Cc', or 'Bcc' header
 701  * fields. The search for 'to' is case sensitive, so that '/To:y' can
 702  * be used to limit the search to just the 'To' field.
 703  */
 704
 705 char lastscan[STRINGLEN];
 706 int
 707 matchfield(char *str, int mesg)
 708 {
 709         struct message *mp;
 710         char *cp, *cp2;
 711
 712         str++;
 713         if (*str == '\0')
 714                 str = lastscan;
 715         else
 716                 strlcpy(lastscan, str, sizeof(lastscan));
 717         mp = &message[mesg-1];
 718
 719         /*
 720          * Now look, ignoring case, for the word in the string.
 721          */
 722
 723         if (value("searchheaders") && (cp = strchr(str, ':')) != NULL) {
 724                 /* Check for special case "/to:" */
 725                 if (strncmp(str, "to:", 3) == 0)
 726                         return (matchto(cp, mesg));
 727                 *cp++ = '\0';
 728                 cp2 = hfield(*str != '\0' ? str : "subject", mp);
 729                 cp[-1] = ':';
 730                 str = cp;
 731                 cp = cp2;
 732         } else
 733                 cp = hfield("subject", mp);
 734
 735         if (cp == NULL)
 736                 return (0);
 737
 738         return (strcasestr(cp, str) != NULL);
 739 }
 740
 741 /*
 742  * Mark the named message by setting its mark bit.
 743  */
 744 static void
 745 mark(int mesg)
 746 {
 747         int i;
 748
 749         i = mesg;
 750         if (i < 1 || i > msgCount)
 751                 errx(1, "Bad message number to mark");
 752         message[i-1].m_flag |= MMARK;
 753 }
 754
 755 /*
 756  * Unmark the named message.
 757  */
 758 static void
 759 unmark(int mesg)
 760 {
 761         int i;
 762
 763         i = mesg;
 764         if (i < 1 || i > msgCount)
 765                 errx(1, "Bad message number to unmark");
 766         message[i-1].m_flag &= ~MMARK;
 767 }
 768
 769 /*
 770  * Return the message number corresponding to the passed meta character.
 771  */
 772 int
 773 metamess(int meta, int f)
 774 {
 775         int c, m;
 776         struct message *mp;
 777
 778         c = meta;
 779         switch (c) {
 780         case '^':
 781                 /*
 782                  * First 'good' message left.
 783                  */
 784                 for (mp = &message[0]; mp < &message[msgCount]; mp++)
 785                         if ((mp->m_flag & MDELETED) == f)
 786                                 return (mp - &message[0] + 1);
 787                 printf("No applicable messages\n");
 788                 return (-1);
 789
 790         case '$':
 791                 /*
 792                  * Last 'good message left.
 793                  */
 794                 for (mp = &message[msgCount-1]; mp >= &message[0]; mp--)
 795                         if ((mp->m_flag & MDELETED) == f)
 796                                 return (mp - &message[0] + 1);
 797                 printf("No applicable messages\n");
 798                 return (-1);
 799
 800         case '.':
 801                 /*
 802                  * Current message.
 803                  */
 804                 m = dot - &message[0] + 1;
 805                 if ((dot->m_flag & MDELETED) != f) {
 806                         printf("%d: Inappropriate message\n", m);
 807                         return (-1);
 808                 }
 809                 return (m);
 810
 811         default:
 812                 printf("Unknown metachar (%c)\n", c);
 813                 return (-1);
 814         }
 815 }