diplodocus.org Git - nmh/blob - uip/msh.c

   1
   2 /*
   3  * msh.c -- The nmh shell
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 /*
  11  * TODO:
  12  *    Keep more status information in maildrop map
  13  */
  14
  15 #include <h/mh.h>
  16 #include <fcntl.h>
  17 #include <h/signals.h>
  18 #include <h/dropsbr.h>
  19 #include <h/fmt_scan.h>
  20 #include <h/scansbr.h>
  21 #include <h/tws.h>
  22 #include <h/mts.h>
  23 #include <h/utils.h>
  24
  25 #include <termios.h>
  26
  27 #include <pwd.h>
  28 #include <h/m_setjmp.h>
  29 #include <signal.h>
  30 #include <h/msh.h>
  31 #include <h/vmhsbr.h>
  32
  33 #define QUOTE   '\\'            /* sigh */
  34
  35 static struct swit switches[] = {
  36 #define IDSW                  0
  37     { "idstart number", -7 },           /* interface from bbc */
  38 #define FDSW                  1
  39     { "idstop number", -6 },            /*  .. */
  40 #define QDSW                  2
  41     { "idquit number", -6 },            /*  .. */
  42 #define NMSW                  3
  43     { "idname BBoard", -6 },            /*  .. */
  44 #define PRMPTSW               4
  45     { "prompt string", 0 },
  46 #define SCANSW                5
  47     { "scan", 0 },
  48 #define NSCANSW               6
  49     { "noscan", 0 },
  50 #define READSW                7
  51     { "vmhread fd", -7 },
  52 #define WRITESW               8
  53     { "vmhwrite fd", -8 },
  54 #define PREADSW               9
  55     { "popread fd", -7 },
  56 #define PWRITSW              10
  57     { "popwrite fd", -8 },
  58 #define TCURSW               11
  59     { "topcur", 0 },
  60 #define NTCURSW              12
  61     { "notopcur", 0 },
  62 #define VERSIONSW            13
  63     { "version", 0 },
  64 #define HELPSW               14
  65     { "help", 0 },
  66     { NULL, 0 }
  67 };
  68
  69 static int mbx_style = MMDF_FORMAT;
  70
  71 /*
  72  * FOLDER
  73  */
  74 char*fmsh = NULL;                       /* folder instead of file              */
  75 int modified;                           /* command modified folder             */
  76 struct msgs *mp;                        /* used a lot                          */
  77 static int nMsgs = 0;
  78 struct Msg *Msgs = NULL;                /* Msgs[0] not used                    */
  79 static FILE *fp;                        /* input file                          */
  80 static FILE *yp = NULL;                 /* temporary file                      */
  81 static int mode;                        /* mode of file                        */
  82 static int numfds = 0;                  /* number of files cached              */
  83 static int maxfds = 0;                  /* number of files cached to be cached */
  84 static time_t mtime = (time_t) 0;       /* mtime of file                       */
  85
  86 /*
  87  * VMH
  88  */
  89 #define ALARM   ((unsigned int) 10)
  90 #define ttyN(c) ttyNaux ((c), NULL)
  91
  92 static int vmh = 0;
  93
  94 static int vmhpid = OK;
  95 static int vmhfd0;
  96 static int vmhfd1;
  97 static int vmhfd2;
  98
  99 static int vmhtty = NOTOK;
 100
 101 #define SCAN    1
 102 #define STATUS  2
 103 #define DISPLAY 3
 104 #define NWIN    DISPLAY
 105
 106 static int topcur = 0;
 107
 108 static int numwins = 0;
 109 static int windows[NWIN + 1];
 110
 111 static jmp_buf peerenv;
 112
 113 /*
 114  * PARENT
 115  */
 116 static int pfd = NOTOK;         /* fd parent is reading from */
 117 static int ppid = 0;            /* pid of parent             */
 118
 119 /*
 120  * COMMAND
 121  */
 122 int interactive;                /* running from a /dev/tty */
 123 int redirected;                 /* re-directing output     */
 124 FILE *sp = NULL;                /* original stdout         */
 125
 126 char *cmd_name;                 /* command being run   */
 127 char myfilter[BUFSIZ];          /* path to mhl.forward */
 128
 129 static char *myprompt = "(%s) ";/* prompting string */
 130
 131 /*
 132  * BBOARDS
 133  */
 134 static int gap;                 /* gap in BBoard-ID:s */
 135 static char *myname = NULL;     /* BBoard name        */
 136 char *BBoard_ID = "BBoard-ID";  /* BBoard-ID constant */
 137
 138 /*
 139  * SIGNALS
 140  */
 141 SIGNAL_HANDLER istat;           /* original SIGINT  */
 142 static SIGNAL_HANDLER pstat;    /* current SIGPIPE  */
 143 SIGNAL_HANDLER qstat;           /* original SIGQUIT */
 144
 145 #ifdef SIGTSTP
 146 SIGNAL_HANDLER tstat;           /* original SIGTSTP */
 147 #endif
 148
 149 int interrupted;                /* SIGINT detected  */
 150 int broken_pipe;                /* SIGPIPE detected */
 151 int told_to_quit;               /* SIGQUIT detected */
 152
 153 /*
 154  * prototypes
 155  */
 156 int SOprintf (char *, ...);  /* from termsbr.c */
 157 int sc_width (void);         /* from termsbr.c */
 158 void fsetup (char *);
 159 void setup (char *);
 160 FILE *msh_ready (int, int);
 161 void readids (int);
 162 int readid (int);
 163 void display_info (int);
 164 int expand (char *);
 165 void m_reset (void);
 166 void seq_setcur (struct msgs *, int);
 167 void padios (char *, char *, ...);
 168 void padvise (char *, char *, ...);
 169
 170
 171 /*
 172  * static prototypes
 173  */
 174 static void msh (int);
 175 static int read_map (char *, long);
 176 static int read_file (long, int);
 177
 178 static void m_gMsgs (int);
 179 FILE *msh_ready (int, int);
 180 static int check_folder (int);
 181 static void scanrange (int, int);
 182 static void scanstring (char *);
 183 static void write_ids (void);
 184 static void quit (void);
 185 static int getargs (char *, struct swit *, struct Cmd *);
 186 static int getcmds (struct swit *, struct Cmd *, int);
 187 static int parse (char *, struct Cmd *);
 188 static int init_io (struct Cmd *, int);
 189 static int initaux_io (struct Cmd *);
 190 static void fin_io (struct Cmd *, int);
 191 static void finaux_io (struct Cmd *);
 192 static void m_init (void);
 193 static void intrser (int);
 194 static void pipeser (int);
 195 static void quitser (int);
 196 static void alrmser (int);
 197 static int pINI (void);
 198 static int pQRY (char *, int);
 199 static int pQRY1 (int);
 200 static int pQRY2 (void);
 201 static int pCMD (char *, struct swit *, struct Cmd *);
 202 static int pFIN (void);
 203 static int peerwait (void);
 204 static int ttyNaux (struct Cmd *, char *);
 205 static int ttyR (struct Cmd *);
 206 static int winN (struct Cmd *, int, int);
 207 static int winR (struct Cmd *);
 208 static int winX (int);
 209
 210
 211 int
 212 main (int argc, char **argv)
 213 {
 214     int id = 0, scansw = 0, vmh1 = 0, vmh2 = 0;
 215     char *cp, *file = NULL, *folder = NULL;
 216     char **argp, **arguments, buf[BUFSIZ];
 217
 218 #ifdef LOCALE
 219     setlocale(LC_ALL, "");
 220 #endif
 221     invo_name = r1bindex (argv[0], '/');
 222
 223     /* read user profile/context */
 224     context_read();
 225
 226     mts_init (invo_name);
 227     arguments = getarguments (invo_name, argc,argv, 1);
 228     argp = arguments;
 229
 230     while ((cp = *argp++)) {
 231         if (*cp == '-')
 232             switch (smatch (++cp, switches)) {
 233                 case AMBIGSW:
 234                     ambigsw (cp, switches);
 235                     done (1);
 236                 case UNKWNSW:
 237                     adios (NULL, "-%s unknown", cp);
 238
 239                 case HELPSW:
 240                     snprintf (buf, sizeof(buf), "%s [switches] file", invo_name);
 241                     print_help (buf, switches, 1);
 242                     done (1);
 243                 case VERSIONSW:
 244                     print_version(invo_name);
 245                     done (1);
 246
 247                 case IDSW:
 248                     if (!(cp = *argp++) || *cp == '-')
 249                         adios (NULL, "missing argument to %s", argp[-2]);
 250                     if ((id = atoi (cp)) < 1)
 251                         adios (NULL, "bad argument %s %s", argp[-2], cp);
 252                     continue;
 253                 case FDSW:
 254                     if (!(cp = *argp++) || *cp == '-')
 255                         adios (NULL, "missing argument to %s", argp[-2]);
 256                     if ((pfd = atoi (cp)) <= 1)
 257                         adios (NULL, "bad argument %s %s", argp[-2], cp);
 258                     continue;
 259                 case QDSW:
 260                     if (!(cp = *argp++) || *cp == '-')
 261                         adios (NULL, "missing argument to %s", argp[-2]);
 262                     if ((ppid = atoi (cp)) <= 1)
 263                         adios (NULL, "bad argument %s %s", argp[-2], cp);
 264                     continue;
 265                 case NMSW:
 266                     if (!(myname = *argp++) || *myname == '-')
 267                         adios (NULL, "missing argument to %s", argp[-2]);
 268                     continue;
 269
 270                 case SCANSW:
 271                     scansw++;
 272                     continue;
 273                 case NSCANSW:
 274                     scansw = 0;
 275                     continue;
 276
 277                 case PRMPTSW:
 278                     if (!(myprompt = *argp++) || *myprompt == '-')
 279                         adios (NULL, "missing argument to %s", argp[-2]);
 280                     continue;
 281
 282                 case READSW:
 283                     if (!(cp = *argp++) || *cp == '-')
 284                         adios (NULL, "missing argument to %s", argp[-2]);
 285                     if ((vmh1 = atoi (cp)) < 1)
 286                         adios (NULL, "bad argument %s %s", argp[-2], cp);
 287                     continue;
 288                 case WRITESW:
 289                     if (!(cp = *argp++) || *cp == '-')
 290                         adios (NULL, "missing argument to %s", argp[-2]);
 291                     if ((vmh2 = atoi (cp)) < 1)
 292                         adios (NULL, "bad argument %s %s", argp[-2], cp);
 293                     continue;
 294
 295                 case PREADSW:
 296                     if (!(cp = *argp++) || *cp == '-')
 297                         adios (NULL, "missing argument to %s", argp[-2]);
 298                     continue;
 299                 case PWRITSW:
 300                     if (!(cp = *argp++) || *cp == '-')
 301                         adios (NULL, "missing argument to %s", argp[-2]);
 302                     continue;
 303
 304                 case TCURSW:
 305                     topcur++;
 306                     continue;
 307                 case NTCURSW:
 308                     topcur = 0;
 309                     continue;
 310             }
 311         if (*cp == '+' || *cp == '@') {
 312             if (folder)
 313                 adios (NULL, "only one folder at a time!");
 314             else
 315                 folder = pluspath (cp);
 316         }
 317         else
 318             if (file)
 319                 adios (NULL, "only one file at a time!");
 320             else
 321                 file = cp;
 322     }
 323
 324     if (!file && !folder)
 325         file = "./msgbox";
 326     if (file && folder)
 327         adios (NULL, "use a file or a folder, not both");
 328     strncpy (myfilter, etcpath (mhlforward), sizeof(myfilter));
 329 #ifdef FIOCLEX
 330     if (pfd > 1)
 331         ioctl (pfd, FIOCLEX, NULL);
 332 #endif /* FIOCLEX */
 333
 334     istat = SIGNAL2 (SIGINT, intrser);
 335     qstat = SIGNAL2 (SIGQUIT, quitser);
 336
 337     sc_width ();                /* MAGIC... */
 338
 339     if ((vmh = vmh1 && vmh2)) {
 340         rcinit (vmh1, vmh2);
 341         pINI ();
 342         SIGNAL (SIGINT, SIG_IGN);
 343         SIGNAL (SIGQUIT, SIG_IGN);
 344 #ifdef SIGTSTP
 345         tstat = SIGNAL (SIGTSTP, SIG_IGN);
 346 #endif /* SIGTSTP */
 347     }
 348
 349     if (folder)
 350         fsetup (folder);
 351     else
 352         setup (file);
 353     readids (id);
 354     display_info (id > 0 ? scansw : 0);
 355
 356     msh (id > 0 ? scansw : 0);
 357
 358     m_reset ();
 359
 360     done (0);
 361     return 1;
 362 }
 363
 364
 365 static struct swit mshcmds[] = {
 366 #define ADVCMD  0
 367     { "advance", -7 },
 368 #define ALICMD  1
 369     { "ali", 0 },
 370 #define EXPLCMD 2
 371     { "burst", 0 },
 372 #define COMPCMD 3
 373     { "comp", 0 },
 374 #define DISTCMD 4
 375     { "dist", 0 },
 376 #define EXITCMD 5
 377     { "exit", 0 },
 378 #define FOLDCMD 6
 379     { "folder", 0 },
 380 #define FORWCMD 7
 381     { "forw", 0 },
 382 #define HELPCMD 8
 383     { "help", 0 },
 384 #define INCMD   9
 385     { "inc", 0 },
 386 #define MARKCMD 10
 387     { "mark", 0 },
 388 #define MAILCMD 11
 389     { "mhmail", 0 },
 390 #define MHNCMD  12
 391     { "mhn", 0 },
 392 #define MSGKCMD 13
 393     { "msgchk", 0 },
 394 #define NEXTCMD 14
 395     { "next", 0 },
 396 #define PACKCMD 15
 397     { "packf", 0 },
 398 #define PICKCMD 16
 399     { "pick", 0 },
 400 #define PREVCMD 17
 401     { "prev", 0 },
 402 #define QUITCMD 18
 403     { "quit", 0 },
 404 #define FILECMD 19
 405     { "refile", 0 },
 406 #define REPLCMD 20
 407     { "repl", 0 },
 408 #define RMMCMD  21
 409     { "rmm", 0 },
 410 #define SCANCMD 22
 411     { "scan", 0 },
 412 #define SENDCMD 23
 413     { "send", 0 },
 414 #define SHOWCMD 24
 415     { "show", 0 },
 416 #define SORTCMD 25
 417     { "sortm", 0 },
 418 #define WHATCMD 26
 419     { "whatnow", 0 },
 420 #define WHOMCMD 27
 421     { "whom", 0 },
 422     { NULL, 0 }
 423 };
 424
 425
 426 static void
 427 msh (int scansw)
 428 {
 429     int i;
 430     register char *cp, **ap;
 431     char prompt[BUFSIZ], *vec[MAXARGS];
 432     struct Cmd typein;
 433     register struct Cmd *cmdp;
 434     static int once_only = ADVCMD;
 435
 436     snprintf (prompt, sizeof(prompt), myprompt, invo_name);
 437     cmdp = &typein;
 438
 439     for (;;) {
 440         if (yp) {
 441             fclose (yp);
 442             yp = NULL;
 443         }
 444         if (vmh) {
 445             if ((i = getcmds (mshcmds, cmdp, scansw)) == EOF) {
 446                 rcdone ();
 447                 return;
 448             }
 449         } else {
 450             check_folder (scansw);
 451             if ((i = getargs (prompt, mshcmds, cmdp)) == EOF) {
 452                 putchar ('\n');
 453                 return;
 454             }
 455         }
 456         cmd_name = mshcmds[i].sw;
 457
 458         switch (i) {
 459             case QUITCMD:
 460                 quit ();
 461                 return;
 462
 463             case ADVCMD:
 464                 if (once_only == ADVCMD)
 465                     once_only = i = SHOWCMD;
 466                 else
 467                     i = mp->curmsg != mp->hghmsg ? NEXTCMD : EXITCMD;
 468                 cmd_name = mshcmds[i].sw;
 469                 /* and fall... */
 470
 471             case EXITCMD:
 472             case EXPLCMD:
 473             case FOLDCMD:
 474             case FORWCMD:       /* sigh */
 475             case MARKCMD:
 476             case NEXTCMD:
 477             case PACKCMD:
 478             case PICKCMD:
 479             case PREVCMD:
 480             case RMMCMD:
 481             case SHOWCMD:
 482             case SCANCMD:
 483             case SORTCMD:
 484                 if ((cp = context_find (cmd_name))) {
 485                     cp = getcpy (cp);
 486                     ap = brkstring (cp, " ", "\n");
 487                     ap = copyip (ap, vec, MAXARGS);
 488                 } else {
 489                     ap = vec;
 490                 }
 491                 break;
 492
 493             default:
 494                 cp = NULL;
 495                 ap = vec;
 496                 break;
 497         }
 498         copyip (cmdp->args + 1, ap, MAXARGS);
 499
 500         m_init ();
 501
 502         if (!vmh && init_io (cmdp, vmh) == NOTOK) {
 503             if (cp != NULL)
 504                 free (cp);
 505             continue;
 506         }
 507         modified = 0;
 508         redirected = vmh || cmdp->direction != STDIO;
 509
 510         switch (i) {
 511             case ALICMD:
 512             case COMPCMD:
 513             case INCMD:
 514             case MAILCMD:
 515             case MSGKCMD:
 516             case SENDCMD:
 517             case WHATCMD:
 518             case WHOMCMD:
 519                 if (!vmh || ttyN (cmdp) != NOTOK)
 520                     forkcmd (vec, cmd_name);
 521                 break;
 522
 523             case DISTCMD:
 524                 if (!vmh || ttyN (cmdp) != NOTOK)
 525                     distcmd (vec);
 526                 break;
 527
 528             case EXPLCMD:
 529                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 530                     explcmd (vec);
 531                 break;
 532
 533             case FILECMD:
 534                 if (!vmh
 535                         || (filehak (vec) == OK ? ttyN (cmdp)
 536                                         : winN (cmdp, DISPLAY, 1)) != NOTOK)
 537                     filecmd (vec);
 538                 break;
 539
 540             case FOLDCMD:
 541                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 542                     foldcmd (vec);
 543                 break;
 544
 545             case FORWCMD:
 546                 if (!vmh || ttyN (cmdp) != NOTOK)
 547                     forwcmd (vec);
 548                 break;
 549
 550             case HELPCMD:
 551                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 552                     helpcmd (vec);
 553                 break;
 554
 555             case EXITCMD:
 556             case MARKCMD:
 557                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 558                     markcmd (vec);
 559                 break;
 560
 561             case MHNCMD:
 562                 if (!vmh || ttyN (cmdp) != NOTOK)
 563                     mhncmd (vec);
 564                 break;
 565
 566             case NEXTCMD:
 567             case PREVCMD:
 568             case SHOWCMD:
 569                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 570                     showcmd (vec);
 571                 break;
 572
 573             case PACKCMD:
 574                 if (!vmh
 575                         || (packhak (vec) == OK ? ttyN (cmdp)
 576                                         : winN (cmdp, DISPLAY, 1)) != NOTOK)
 577                     packcmd (vec);
 578                 break;
 579
 580             case PICKCMD:
 581                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 582                     pickcmd (vec);
 583                 break;
 584
 585             case REPLCMD:
 586                 if (!vmh || ttyN (cmdp) != NOTOK)
 587                     replcmd (vec);
 588                 break;
 589
 590             case RMMCMD:
 591                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 592                     rmmcmd (vec);
 593                 break;
 594
 595             case SCANCMD:
 596                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 597                     scancmd (vec);
 598                 break;
 599
 600             case SORTCMD:
 601                 if (!vmh || winN (cmdp, DISPLAY, 1) != NOTOK)
 602                     sortcmd (vec);
 603                 break;
 604
 605             default:
 606                 padios (NULL, "no dispatch for %s", cmd_name);
 607         }
 608
 609         if (vmh) {
 610             if (vmhtty != NOTOK)
 611                 ttyR (cmdp);
 612             if (vmhpid > OK)
 613                 winR (cmdp);
 614         }
 615         else
 616             fin_io (cmdp, vmh);
 617         if (cp != NULL)
 618             free (cp);
 619         if (i == EXITCMD) {
 620             quit ();
 621             return;
 622         }
 623     }
 624 }
 625
 626
 627 void
 628 fsetup (char *folder)
 629 {
 630     register int msgnum;
 631     char *maildir;
 632     struct stat st;
 633
 634     maildir = m_maildir (folder);
 635     if (chdir (maildir) == NOTOK)
 636         padios (maildir, "unable to change directory to");
 637
 638     /* read folder and create message structure */
 639     if (!(mp = folder_read (folder)))
 640         padios (NULL, "unable to read folder %s", folder);
 641
 642     /* check for empty folder */
 643     if (mp->nummsg == 0)
 644         padios (NULL, "no messages in %s", folder);
 645
 646     mode = m_gmprot ();
 647     mtime = stat (mp->foldpath, &st) != NOTOK ? st.st_mtime : 0;
 648
 649     m_gMsgs (mp->hghmsg);
 650
 651     for (msgnum = mp->lowmsg; msgnum <= mp->hghmsg; msgnum++) {
 652         Msgs[msgnum].m_bboard_id = 0;
 653         Msgs[msgnum].m_top = NOTOK;
 654         Msgs[msgnum].m_start = Msgs[msgnum].m_stop = 0L;
 655         Msgs[msgnum].m_scanl = NULL;
 656     }
 657
 658     m_init ();
 659
 660     fmsh = getcpy (folder);
 661
 662     maxfds = OPEN_MAX / 2;
 663
 664     if ((maxfds -= 2) < 1)
 665         maxfds = 1;
 666 }
 667
 668
 669 void
 670 setup (char *file)
 671 {
 672     int i, msgp;
 673     struct stat st;
 674     if ((fp = fopen (file, "r")) == NULL)
 675         padios (file, "unable to read");
 676 #ifdef FIOCLEX
 677     ioctl (fileno (fp), FIOCLEX, NULL);
 678 #endif /* FIOCLEX */
 679     if (fstat (fileno (fp), &st) != NOTOK) {
 680         mode = (int) (st.st_mode & 0777), mtime = st.st_mtime;
 681         msgp = read_map (file, (long) st.st_size);
 682     }
 683     else {
 684         mode = m_gmprot (), mtime = 0;
 685         msgp = 0;
 686     }
 687
 688     if ((msgp = read_file (msgp ? Msgs[msgp].m_stop : 0L, msgp + 1)) < 1)
 689         padios (NULL, "no messages in %s", myname ? myname : file);
 690
 691     if (!(mp = (struct msgs  *) calloc ((size_t) 1, sizeof(*mp))))
 692         padios (NULL, "unable to allocate folder storage");
 693
 694     if (!(mp->msgstats = calloc ((size_t) msgp + 3, sizeof(*(mp->msgstats)))))
 695         padios (NULL, "unable to allocate message status storage");
 696
 697     mp->hghmsg = msgp;
 698     mp->nummsg = msgp;
 699     mp->lowmsg = 1;
 700     mp->curmsg = 0;
 701     mp->foldpath = getcpy (myname ? myname : file);
 702     clear_folder_flags (mp);
 703
 704         stat (file, &st);
 705         if (st.st_uid != getuid () || access (file, W_OK) == NOTOK)
 706             set_readonly (mp);
 707
 708     mp->lowoff = 1;
 709     mp->hghoff = mp->hghmsg + 1;
 710
 711     for (i = mp->lowmsg; i <= mp->hghmsg; i++) {
 712         clear_msg_flags (mp, i);
 713         set_exists (mp, i);
 714     }
 715     m_init ();
 716
 717     mp->msgattrs[0] = getcpy ("unseen");
 718     mp->msgattrs[1] = NULL;
 719
 720     m_unknown (fp);             /* the MAGIC invocation */
 721     if (fmsh) {
 722         free (fmsh);
 723         fmsh = NULL;
 724     }
 725 }
 726
 727
 728 static int
 729 read_map (char *file, long size)
 730 {
 731     register int i, msgp;
 732     register struct drop *dp, *mp;
 733     struct drop *rp;
 734
 735     if ((i = map_read (file, size, &rp, 1)) == 0)
 736         return 0;
 737
 738     m_gMsgs (i);
 739
 740     msgp = 1;
 741     for (dp = rp + 1; i-- > 0; msgp++, dp++) {
 742         mp = &Msgs[msgp].m_drop;
 743         mp->d_id = dp->d_id;
 744         mp->d_size = dp->d_size;
 745         mp->d_start = dp->d_start;
 746         mp->d_stop = dp->d_stop;
 747         Msgs[msgp].m_scanl = NULL;
 748     }
 749     free ((char *) rp);
 750
 751     return (msgp - 1);
 752 }
 753
 754
 755 static int
 756 read_file (long pos, int msgp)
 757 {
 758     register int i;
 759     register struct drop *dp, *mp;
 760     struct drop *rp;
 761
 762     if ((i = mbx_read (fp, pos, &rp, 1)) <= 0)
 763         return (msgp - 1);
 764
 765     m_gMsgs ((msgp - 1) + i);
 766
 767     for (dp = rp; i-- > 0; msgp++, dp++) {
 768         mp = &Msgs[msgp].m_drop;
 769         mp->d_id = 0;
 770         mp->d_size = dp->d_size;
 771         mp->d_start = dp->d_start;
 772         mp->d_stop = dp->d_stop;
 773         Msgs[msgp].m_scanl = NULL;
 774     }
 775     free ((char *) rp);
 776
 777     return (msgp - 1);
 778 }
 779
 780
 781 static void
 782 m_gMsgs (int n)
 783 {
 784     int nmsgs;
 785
 786     if (Msgs == NULL) {
 787         nMsgs = n + MAXFOLDER / 2;
 788         Msgs = (struct Msg *) calloc ((size_t) (nMsgs + 2), sizeof *Msgs);
 789         if (Msgs == NULL)
 790             padios (NULL, "unable to allocate Msgs structure");
 791         return;
 792     }
 793
 794     if (nMsgs >= n)
 795         return;
 796
 797     nmsgs = nMsgs + n + MAXFOLDER / 2;
 798     Msgs = (struct Msg *) mh_xrealloc ((char *) Msgs, (size_t) (nmsgs + 2) * sizeof *Msgs);
 799     memset((char *) (Msgs + nMsgs + 2), 0, (size_t) ((nmsgs - nMsgs) * sizeof *Msgs));
 800
 801     nMsgs = nmsgs;
 802 }
 803
 804
 805 FILE *
 806 msh_ready (int msgnum, int full)
 807 {
 808     NMH_UNUSED (full);
 809     register int msgp;
 810     int fd;
 811     char *cp;
 812
 813     if (yp) {
 814         fclose (yp);
 815         yp = NULL;
 816     }
 817
 818     if (fmsh) {
 819         if ((fd = Msgs[msgnum].m_top) == NOTOK) {
 820             if (numfds >= maxfds)
 821                 for (msgp = mp->lowmsg; msgp <= mp->hghmsg; msgp++)
 822                     if (Msgs[msgp].m_top != NOTOK) {
 823                         close (Msgs[msgp].m_top);
 824                         Msgs[msgp].m_top = NOTOK;
 825                         numfds--;
 826                         break;
 827                     }
 828
 829             if ((fd = open (cp = m_name (msgnum), O_RDONLY)) == NOTOK)
 830                 padios (cp, "unable to open message");
 831             Msgs[msgnum].m_top = fd;
 832             numfds++;
 833         }
 834
 835         if ((fd = dup (fd)) == NOTOK)
 836             padios ("cached message", "unable to dup");
 837         if ((yp = fdopen (fd, "r")) == NULL)
 838             padios (NULL, "unable to fdopen cached message");
 839         fseek (yp, 0L, SEEK_SET);
 840         return yp;
 841     }
 842
 843     m_eomsbr ((int (*)()) 0);   /* XXX */
 844     fseek (fp, Msgs[msgnum].m_start, SEEK_SET);
 845     return fp;
 846 }
 847
 848
 849 static int
 850 check_folder (int scansw)
 851 {
 852     int seqnum, i, low, hgh, msgp;
 853     struct stat st;
 854
 855     if (fmsh) {
 856         if (stat (mp->foldpath, &st) == NOTOK)
 857             padios (mp->foldpath, "unable to stat");
 858         if (mtime == st.st_mtime)
 859             return 0;
 860         mtime = st.st_mtime;
 861
 862         low = mp->hghmsg + 1;
 863         folder_free (mp);               /* free folder/message structure */
 864
 865         if (!(mp = folder_read (fmsh)))
 866             padios (NULL, "unable to re-read folder %s", fmsh);
 867
 868         hgh = mp->hghmsg;
 869
 870         for (msgp = mp->lowmsg; msgp <= mp->hghmsg; msgp++) {
 871             if (Msgs[msgp].m_top != NOTOK) {
 872                 close (Msgs[msgp].m_top);
 873                 Msgs[msgp].m_top = NOTOK;
 874                 numfds--;
 875             }
 876             if (Msgs[msgp].m_scanl) {
 877                 free (Msgs[msgp].m_scanl);
 878                 Msgs[msgp].m_scanl = NULL;
 879             }
 880         }
 881
 882         m_init ();
 883
 884         if (modified || low > hgh)
 885             return 1;
 886         goto check_vmh;
 887     }
 888     if (fstat (fileno (fp), &st) == NOTOK)
 889         padios (mp->foldpath, "unable to fstat");
 890     if (mtime == st.st_mtime)
 891         return 0;
 892     mode = (int) (st.st_mode & 0777);
 893     mtime = st.st_mtime;
 894
 895     if ((msgp = read_file (Msgs[mp->hghmsg].m_stop, mp->hghmsg + 1)) < 1)
 896         padios (NULL, "no messages in %s", mp->foldpath);       /* XXX */
 897     if (msgp >= MAXFOLDER)
 898         padios (NULL, "more than %d messages in %s", MAXFOLDER,
 899                 mp->foldpath);
 900     if (msgp <= mp->hghmsg)
 901         return 0;               /* XXX */
 902
 903     if (!(mp = folder_realloc (mp, mp->lowoff, msgp)))
 904         padios (NULL, "unable to allocate folder storage");
 905
 906     low = mp->hghmsg + 1, hgh = msgp;
 907     seqnum = scansw ? seq_getnum (mp, "unseen") : -1;
 908     for (i = mp->hghmsg + 1; i <= msgp; i++) {
 909         set_exists(mp, i);
 910         if (seqnum != -1)
 911             add_sequence(mp, seqnum, i);
 912         mp->nummsg++;
 913     }
 914     mp->hghmsg = msgp;
 915     m_init ();
 916
 917 check_vmh: ;
 918     if (vmh)
 919         return 1;
 920
 921     advise (NULL, "new messages have arrived!\007");
 922     if (scansw)
 923         scanrange (low, hgh);
 924
 925     return 1;
 926 }
 927
 928
 929 static void
 930 scanrange (int low, int hgh)
 931 {
 932     char buffer[BUFSIZ];
 933
 934     snprintf (buffer, sizeof(buffer), "%d-%d", low, hgh);
 935     scanstring (buffer);
 936 }
 937
 938
 939 static void
 940 scanstring (char *arg)
 941 {
 942     char *cp, **ap, *vec[MAXARGS];
 943
 944     /*
 945      * This should be replace with a call to getarguments()
 946      */
 947     if ((cp = context_find (cmd_name = "scan"))) {
 948         cp = getcpy (cp);
 949         ap = brkstring (cp, " ", "\n");
 950         ap = copyip (ap, vec, MAXARGS);
 951     } else {
 952         ap = vec;
 953     }
 954     *ap++ = arg;
 955     *ap = NULL;
 956     m_init ();
 957     scancmd (vec);
 958     if (cp != NULL)
 959         free (cp);
 960 }
 961
 962
 963 void
 964 readids (int id)
 965 {
 966     register int cur, seqnum, i=0, msgnum;
 967
 968     if (mp->curmsg == 0)
 969         seq_setcur (mp, mp->lowmsg);
 970     if (id <= 0 || (seqnum = seq_getnum (mp, "unseen")) == -1)
 971         return;
 972
 973     for (msgnum = mp->hghmsg; msgnum >= mp->lowmsg; msgnum--)
 974         add_sequence(mp, seqnum, msgnum);
 975
 976     if (id != 1) {
 977         cur = mp->curmsg;
 978
 979         for (msgnum = mp->hghmsg; msgnum >= mp->lowmsg; msgnum--)
 980           if (does_exist(mp, msgnum))           /* FIX */
 981             if ((i = readid (msgnum)) > 0 && i < id) {
 982                 cur = msgnum + 1;
 983                 clear_sequence(mp, seqnum, msgnum);
 984                 break;
 985             }
 986         for (i = mp->lowmsg; i < msgnum; i++)
 987             clear_sequence(mp, seqnum, i);
 988
 989         if (cur > mp->hghmsg)
 990             cur = mp->hghmsg;
 991
 992         seq_setcur (mp, cur);
 993     }
 994
 995     if ((gap = 1 < id && id < (i = readid (mp->lowmsg)) ? id : 0) && !vmh)
 996         advise (NULL, "gap in ID:s, last seen %d, lowest present %d\n",
 997                 id - 1, i);
 998 }
 999
1000
1001 int
1002 readid (int msgnum)
1003 {
1004     int i, state;
1005     char *bp, buf[BUFSIZ], name[NAMESZ];
1006     register FILE *zp;
1007
1008     if (Msgs[msgnum].m_bboard_id)
1009         return Msgs[msgnum].m_bboard_id;
1010
1011     zp = msh_ready (msgnum, 0);
1012     for (state = FLD;;)
1013         switch (state = m_getfld (state, name, buf, sizeof(buf), zp)) {
1014             case FLD:
1015             case FLDEOF:
1016             case FLDPLUS:
1017                 if (!mh_strcasecmp (name, BBoard_ID)) {
1018                     bp = getcpy (buf);
1019                     while (state == FLDPLUS) {
1020                         state = m_getfld (state, name, buf, sizeof(buf), zp);
1021                         bp = add (buf, bp);
1022                     }
1023                     i = atoi (bp);
1024                     free (bp);
1025                     if (i > 0)
1026                         return (Msgs[msgnum].m_bboard_id = i);
1027                     else
1028                         continue;
1029                 }
1030                 while (state == FLDPLUS)
1031                     state = m_getfld (state, name, buf, sizeof(buf), zp);
1032                 if (state != FLDEOF)
1033                     continue;
1034
1035             default:
1036                 return 0;
1037         }
1038 }
1039
1040
1041 void
1042 display_info (int scansw)
1043 {
1044     int seqnum, sd;
1045
1046     interactive = isatty (fileno (stdout));
1047     if (sp == NULL) {
1048         if ((sd = dup (fileno (stdout))) == NOTOK)
1049             padios ("standard output", "unable to dup");
1050 #ifdef FIOCLEX
1051         ioctl (sd, FIOCLEX, NULL);
1052 #endif /* FIOCLEX */
1053         if ((sp = fdopen (sd, "w")) == NULL)
1054             padios ("standard output", "unable to fdopen");
1055     }
1056
1057     m_putenv ("mhfolder", mp->foldpath);
1058     if (vmh)
1059         return;
1060
1061     if (myname) {
1062         printf ("Reading ");
1063         if (SOprintf ("%s", myname))
1064             printf ("%s", myname);
1065         printf (", currently at message %d of %d\n",
1066                 mp->curmsg, mp->hghmsg);
1067     }
1068     else {
1069         printf ("Reading ");
1070         if (fmsh)
1071             printf ("+%s", fmsh);
1072         else
1073             printf ("%s", mp->foldpath);
1074         printf (", currently at message %d of %d\n",
1075                 mp->curmsg, mp->hghmsg);
1076     }
1077
1078     if (((seqnum = seq_getnum (mp, "unseen")) != -1)
1079             && scansw
1080             && in_sequence(mp, seqnum, mp->hghmsg))
1081         scanstring ("unseen");
1082 }
1083
1084
1085 static void
1086 write_ids (void)
1087 {
1088     int i = 0, seqnum, msgnum;
1089     char buffer[80];
1090
1091     if (pfd <= 1)
1092         return;
1093
1094     if ((seqnum = seq_getnum (mp, "unseen")) != -1)
1095         for (msgnum = mp->hghmsg; msgnum >= mp->lowmsg; msgnum--)
1096             if (!in_sequence(mp, seqnum, msgnum)) {
1097                 if (Msgs[msgnum].m_bboard_id == 0)
1098                     readid (msgnum);
1099                 if ((i = Msgs[msgnum].m_bboard_id) > 0)
1100                     break;
1101             }
1102
1103     snprintf (buffer, sizeof(buffer), "%d %d\n", i, Msgs[mp->hghmsg].m_bboard_id);
1104     write (pfd, buffer, sizeof(buffer));
1105     close (pfd);
1106     pfd = NOTOK;
1107 }
1108
1109
1110 static void
1111 quit (void)
1112 {
1113     int i, md, msgnum;
1114     char *cp, tmpfil[BUFSIZ];
1115     char map1[BUFSIZ], map2[BUFSIZ];
1116     struct stat st;
1117     FILE *dp;
1118
1119     if (!(mp->msgflags & MODIFIED) || is_readonly(mp) || fmsh) {
1120             if (vmh)
1121                 rc2peer (RC_FIN, 0, NULL);
1122         return;
1123     }
1124
1125     if (vmh)
1126         ttyNaux (NULLCMD, "FAST");
1127     cp = NULL;
1128     if ((dp = lkfopen (mp->foldpath, "r")) == NULL) {
1129         advise (mp->foldpath, "unable to lock");
1130         if (vmh) {
1131             ttyR (NULLCMD);
1132             pFIN ();
1133         }
1134         return;
1135     }
1136     if (fstat (fileno (dp), &st) == NOTOK) {
1137         advise (mp->foldpath, "unable to stat");
1138         goto release;
1139     }
1140     if (mtime != st.st_mtime) {
1141         advise (NULL, "new messages have arrived, no update");
1142         goto release;
1143     }
1144     mode = (int) (st.st_mode & 0777);
1145
1146     if (mp->nummsg == 0) {
1147         cp = concat ("Zero file \"", mp->foldpath, "\"? ", NULL);
1148         if (getanswer (cp)) {
1149             if ((i = creat (mp->foldpath, mode)) != NOTOK)
1150                 close (i);
1151             else
1152                 advise (mp->foldpath, "error zero'ing");
1153             unlink (map_name (mp->foldpath));/* XXX */
1154         }
1155         goto release;
1156     }
1157
1158     cp = concat ("Update file \"", mp->foldpath, "\"? ", NULL);
1159     if (!getanswer (cp))
1160         goto release;
1161     strncpy (tmpfil, m_backup (mp->foldpath), sizeof(tmpfil));
1162     if ((md = mbx_open (tmpfil, mbx_style, st.st_uid, st.st_gid, mode)) == NOTOK) {
1163         advise (tmpfil, "unable to open");
1164         goto release;
1165     }
1166
1167     for (msgnum = mp->lowmsg; msgnum <= mp->hghmsg; msgnum++)
1168         if (does_exist(mp, msgnum) && pack (tmpfil, md, msgnum) == NOTOK) {
1169             mbx_close (tmpfil, md);
1170             unlink (tmpfil);
1171             unlink (map_name (tmpfil));
1172             goto release;
1173         }
1174     mbx_close (tmpfil, md);
1175
1176     if (rename (tmpfil, mp->foldpath) == NOTOK)
1177         admonish (mp->foldpath, "unable to rename %s to", tmpfil);
1178     else {
1179         strncpy (map1, map_name (tmpfil), sizeof(map1));
1180         strncpy (map2, map_name (mp->foldpath), sizeof(map2));
1181
1182         if (rename (map1, map2) == NOTOK) {
1183             admonish (map2, "unable to rename %s to", map1);
1184             unlink (map1);
1185             unlink (map2);
1186         }
1187     }
1188
1189 release: ;
1190     if (cp)
1191         free (cp);
1192     lkfclose (dp, mp->foldpath);
1193     if (vmh) {
1194         ttyR (NULLCMD);
1195         pFIN ();
1196     }
1197 }
1198
1199
1200 static int
1201 getargs (char *prompt, struct swit *sw, struct Cmd *cmdp)
1202 {
1203     int i;
1204     char *cp;
1205     static char buffer[BUFSIZ];
1206
1207     told_to_quit = 0;
1208     for (;;) {
1209         interrupted = 0;
1210         if (interactive) {
1211             printf ("%s", prompt);
1212             fflush (stdout);
1213         }
1214         for (cp = buffer; (i = getchar ()) != '\n';) {
1215             if (interrupted && !told_to_quit) {
1216                 buffer[0] = '\0';
1217                 putchar ('\n');
1218                 break;
1219             }
1220             if (told_to_quit || i == EOF) {
1221                 if (ppid > 0)
1222 #ifdef SIGEMT
1223                     kill (ppid, SIGEMT);
1224 #else
1225                     kill (ppid, SIGTERM);
1226 #endif
1227                 return EOF;
1228             }
1229             if (cp < &buffer[sizeof buffer - 2])
1230                 *cp++ = i;
1231         }
1232         *cp = 0;
1233
1234         if (buffer[0] == 0)
1235             continue;
1236         if (buffer[0] == '?') {
1237             printf ("commands:\n");
1238             print_sw (ALL, sw, "", stdout);
1239             printf ("type CTRL-D or use ``quit'' to leave %s\n",
1240                     invo_name);
1241             continue;
1242         }
1243
1244         if (parse (buffer, cmdp) == NOTOK)
1245             continue;
1246
1247         switch (i = smatch (cmdp->args[0], sw)) {
1248             case AMBIGSW:
1249                 ambigsw (cmdp->args[0], sw);
1250                 continue;
1251             case UNKWNSW:
1252                 printf ("say what: ``%s'' -- type ? (or help) for help\n",
1253                         cmdp->args[0]);
1254                 continue;
1255             default:
1256                 return i;
1257         }
1258     }
1259 }
1260
1261
1262 static int
1263 getcmds (struct swit *sw, struct Cmd *cmdp, int scansw)
1264 {
1265     int i;
1266     struct record rcs, *rc;
1267
1268     rc = &rcs;
1269     initrc (rc);
1270
1271     for (;;)
1272         switch (peer2rc (rc)) {
1273             case RC_QRY:
1274                 pQRY (rc->rc_data, scansw);
1275                 break;
1276
1277             case RC_CMD:
1278                 if ((i = pCMD (rc->rc_data, sw, cmdp)) != NOTOK)
1279                     return i;
1280                 break;
1281
1282             case RC_FIN:
1283                 if (ppid > 0)
1284 #ifdef SIGEMT
1285                     kill (ppid, SIGEMT);
1286 #else
1287                     kill (ppid, SIGTERM);
1288 #endif
1289                 return EOF;
1290
1291             case RC_XXX:
1292                 padios (NULL, "%s", rc->rc_data);
1293
1294             default:
1295                 fmt2peer (RC_ERR, "pLOOP protocol screw-up");
1296                 done (1);
1297         }
1298 }
1299
1300
1301 static int
1302 parse (char *buffer, struct Cmd *cmdp)
1303 {
1304     int argp = 0;
1305     unsigned char c, *cp;
1306     char *pp;
1307
1308     cmdp->line[0] = 0;
1309     pp = cmdp->args[argp++] = cmdp->line;
1310     cmdp->redirect = NULL;
1311     cmdp->direction = STDIO;
1312     cmdp->stream = NULL;
1313
1314     for (cp = buffer; (c = *cp); cp++) {
1315         if (!isspace (c))
1316             break;
1317     }
1318     if (c == '\0') {
1319         if (vmh)
1320             fmt2peer (RC_EOF, "null command");
1321         return NOTOK;
1322     }
1323
1324     while ((c = *cp++)) {
1325         if (isspace (c)) {
1326             while (isspace (c))
1327                 c = *cp++;
1328             if (c == 0)
1329                 break;
1330             *pp++ = 0;
1331             cmdp->args[argp++] = pp;
1332             *pp = 0;
1333         }
1334
1335         switch (c) {
1336             case '"':
1337                 for (;;) {
1338                     switch (c = *cp++) {
1339                         case 0:
1340                             padvise (NULL, "unmatched \"");
1341                             return NOTOK;
1342                         case '"':
1343                             break;
1344                         case QUOTE:
1345                             if ((c = *cp++) == 0)
1346                                 goto no_quoting;
1347                         default:
1348                             *pp++ = c;
1349                             continue;
1350                     }
1351                     break;
1352                 }
1353                 continue;
1354
1355             case QUOTE:
1356                 if ((c = *cp++) == 0) {
1357             no_quoting: ;
1358                     padvise (NULL, "the newline character can not be quoted");
1359                     return NOTOK;
1360                 }
1361
1362             default: ;
1363                 *pp++ = c;
1364                 continue;
1365
1366             case '>':
1367             case '|':
1368                 if (pp == cmdp->line) {
1369                     padvise (NULL, "invalid null command");
1370                     return NOTOK;
1371                 }
1372                 if (*cmdp->args[argp - 1] == 0)
1373                     argp--;
1374                 cmdp->direction = c == '>' ? CRTIO : PIPIO;
1375                 if (cmdp->direction == CRTIO && (c = *cp) == '>') {
1376                     cmdp->direction = APPIO;
1377                     cp++;
1378                 }
1379                 cmdp->redirect = pp + 1;/* sigh */
1380                 for (; (c = *cp); cp++)
1381                     if (!isspace (c))
1382                         break;
1383                 if (c == 0) {
1384                     padvise (NULL, cmdp->direction != PIPIO
1385                             ? "missing name for redirect"
1386                             : "invalid null command");
1387                     return NOTOK;
1388                 }
1389                 strcpy (cmdp->redirect, cp);
1390                 if (cmdp->direction != PIPIO) {
1391                     for (; *cp; cp++)
1392                         if (isspace (*cp)) {
1393                             padvise (NULL, "bad name for redirect");
1394                             return NOTOK;
1395                         }
1396                     if (expand (cmdp->redirect) == NOTOK)
1397                         return NOTOK;
1398                 }
1399                 break;
1400         }
1401         break;
1402     }
1403
1404     *pp++ = 0;
1405     cmdp->args[argp] = NULL;
1406
1407     return OK;
1408 }
1409
1410
1411 int
1412 expand (char *redirect)
1413 {
1414     char *cp, *pp;
1415     char path[BUFSIZ];
1416     struct passwd  *pw;
1417
1418     if (*redirect != '~')
1419         return OK;
1420
1421     if ((cp = strchr(pp = redirect + 1, '/')))
1422         *cp++ = 0;
1423     if (*pp == 0)
1424         pp = mypath;
1425     else
1426         if ((pw = getpwnam (pp)))
1427             pp = pw->pw_dir;
1428         else {
1429             padvise (NULL, "unknown user: %s", pp);
1430             return NOTOK;
1431         }
1432
1433     snprintf (path, sizeof(path), "%s/%s", pp, cp ? cp : "");
1434     strcpy (redirect, path);
1435     return OK;
1436 }
1437
1438
1439 static int
1440 init_io (struct Cmd *cmdp, int vio)
1441 {
1442     int io, result;
1443
1444     io = vmh;
1445
1446     vmh = vio;
1447     result = initaux_io (cmdp);
1448     vmh = io;
1449
1450     return result;
1451 }
1452
1453
1454 static int
1455 initaux_io (struct Cmd *cmdp)
1456 {
1457     char *mode;
1458
1459     switch (cmdp->direction) {
1460         case STDIO:
1461             return OK;
1462
1463         case CRTIO:
1464         case APPIO:
1465             mode = cmdp->direction == CRTIO ? "write" : "append";
1466             if ((cmdp->stream = fopen (cmdp->redirect, mode)) == NULL) {
1467                 padvise (cmdp->redirect, "unable to %s ", mode);
1468                 cmdp->direction = STDIO;
1469                 return NOTOK;
1470             }
1471             break;
1472
1473         case PIPIO:
1474             if ((cmdp->stream = popen (cmdp->redirect, "w")) == NULL) {
1475                 padvise (cmdp->redirect, "unable to pipe");
1476                 cmdp->direction = STDIO;
1477                 return NOTOK;
1478             }
1479             SIGNAL (SIGPIPE, pipeser);
1480             broken_pipe = 0;
1481             break;
1482
1483         default:
1484             padios (NULL, "unknown redirection for command");
1485     }
1486
1487     fflush (stdout);
1488     if (dup2 (fileno (cmdp->stream), fileno (stdout)) == NOTOK)
1489         padios ("standard output", "unable to dup2");
1490     clearerr (stdout);
1491
1492     return OK;
1493 }
1494
1495
1496 static void
1497 fin_io (struct Cmd *cmdp, int vio)
1498 {
1499     int io;
1500
1501     io = vmh;
1502     vmh = vio;
1503     finaux_io (cmdp);
1504     vmh = io;
1505 }
1506
1507
1508 static void
1509 finaux_io (struct Cmd *cmdp)
1510 {
1511     switch (cmdp->direction) {
1512         case STDIO:
1513             return;
1514
1515         case CRTIO:
1516         case APPIO:
1517             fflush (stdout);
1518             close (fileno (stdout));
1519             if (ferror (stdout))
1520                 padvise (NULL, "problems writing %s", cmdp->redirect);
1521             fclose (cmdp->stream);
1522             break;
1523
1524         case PIPIO:
1525             fflush (stdout);
1526             close (fileno (stdout));
1527             pclose (cmdp->stream);
1528             SIGNAL (SIGPIPE, SIG_DFL);
1529             break;
1530
1531         default:
1532             padios (NULL, "unknown redirection for command");
1533     }
1534
1535     if (dup2 (fileno (sp), fileno (stdout)) == NOTOK)
1536         padios ("standard output", "unable to dup2");
1537     clearerr (stdout);
1538
1539     cmdp->direction = STDIO;
1540 }
1541
1542
1543 static void
1544 m_init (void)
1545 {
1546     int msgnum;
1547
1548     for (msgnum = mp->lowmsg; msgnum <= mp->hghmsg; msgnum++)
1549         unset_selected (mp, msgnum);
1550     mp->lowsel = mp->hghsel = mp->numsel = 0;
1551 }
1552
1553
1554 void
1555 m_reset (void)
1556 {
1557     write_ids ();
1558     folder_free (mp);   /* free folder/message structure */
1559     myname = NULL;
1560 }
1561
1562
1563 void
1564 seq_setcur (struct msgs *mp, int msgnum)
1565 {
1566     if (mp->curmsg == msgnum)
1567         return;
1568
1569     if (mp->curmsg && Msgs[mp->curmsg].m_scanl) {
1570         free (Msgs[mp->curmsg].m_scanl);
1571         Msgs[mp->curmsg].m_scanl = NULL;
1572     }
1573     if (Msgs[msgnum].m_scanl) {
1574         free (Msgs[msgnum].m_scanl);
1575         Msgs[msgnum].m_scanl = NULL;
1576     }
1577
1578     mp->curmsg = msgnum;
1579 }
1580
1581
1582
1583 static void
1584 intrser (int i)
1585 {
1586     NMH_UNUSED (i);
1587     discard (stdout);
1588     interrupted++;
1589 }
1590
1591
1592 static void
1593 pipeser (int i)
1594 {
1595     NMH_UNUSED (i);
1596     if (broken_pipe++ == 0)
1597         fprintf (stderr, "broken pipe\n");
1598     told_to_quit++;
1599     interrupted++;
1600 }
1601
1602
1603 static void
1604 quitser (int i)
1605 {
1606     NMH_UNUSED (i);
1607     told_to_quit++;
1608     interrupted++;
1609 }
1610
1611
1612 static void
1613 alrmser (int i)
1614 {
1615     NMH_UNUSED (i);
1616     longjmp (peerenv, DONE);
1617 }
1618
1619
1620 static int
1621 pINI (void)
1622 {
1623     int i, vrsn;
1624     unsigned char *bp;
1625     struct record rcs, *rc;
1626
1627     rc = &rcs;
1628     initrc (rc);
1629
1630     switch (peer2rc (rc)) {
1631         case RC_INI:
1632             bp = rc->rc_data;
1633             while (isspace (*bp))
1634                 bp++;
1635             if (sscanf (bp, "%d", &vrsn) != 1) {
1636         bad_init: ;
1637                 fmt2peer (RC_ERR, "bad init \"%s\"", rc->rc_data);
1638                 done (1);
1639             }
1640             if (vrsn != RC_VRSN) {
1641                 fmt2peer (RC_ERR, "version %d unsupported", vrsn);
1642                 done (1);
1643             }
1644
1645             while (*bp && !isspace (*bp))
1646                 bp++;
1647             while (isspace (*bp))
1648                 bp++;
1649             if (sscanf (bp, "%d", &numwins) != 1 || numwins <= 0)
1650                 goto bad_init;
1651             if (numwins > NWIN)
1652                 numwins = NWIN;
1653
1654             for (i = 1; i <= numwins; i++) {
1655                 while (*bp && !isspace (*bp))
1656                     bp++;
1657                 while (isspace (*bp))
1658                     bp++;
1659                 if (sscanf (bp, "%d", &windows[i]) != 1 || windows[i] <= 0)
1660                     goto bad_init;
1661             }
1662             rc2peer (RC_ACK, 0, NULL);
1663             return OK;
1664
1665         case RC_XXX:
1666             padios (NULL, "%s", rc->rc_data);
1667
1668         default:
1669             fmt2peer (RC_ERR, "pINI protocol screw-up");
1670             done (1);           /* NOTREACHED */
1671     }
1672
1673     return 1;  /* dead code to satisfy the compiler */
1674 }
1675
1676
1677 static int
1678 pQRY (char *str, int scansw)
1679 {
1680     NMH_UNUSED (str);
1681     if (pQRY1 (scansw) == NOTOK || pQRY2 () == NOTOK)
1682         return NOTOK;
1683
1684     rc2peer (RC_EOF, 0, NULL);
1685     return OK;
1686 }
1687
1688
1689 static int
1690 pQRY1 (int scansw)
1691 {
1692     int oldhgh;
1693     static int lastlow = 0,
1694                lastcur = 0,
1695                lasthgh = 0,
1696                lastnum = 0;
1697
1698     oldhgh = mp->hghmsg;
1699     if (check_folder (scansw) && oldhgh < mp->hghmsg) {
1700         switch (winX (STATUS)) {
1701             case NOTOK:
1702                 return NOTOK;
1703
1704             case OK:
1705                 printf ("new messages have arrived!");
1706                 fflush (stdout);
1707                 fflush (stderr);
1708                 _exit (0);      /* NOTREACHED */
1709
1710             default:
1711                 lastlow = lastcur = lasthgh = lastnum = 0;
1712                 break;
1713         }
1714
1715         switch (winX (DISPLAY)) {
1716             case NOTOK:
1717                 return NOTOK;
1718
1719             case OK:
1720                 scanrange (oldhgh + 1, mp->hghmsg);
1721                 fflush (stdout);
1722                 fflush (stderr);
1723                 _exit (0);      /* NOTREACHED */
1724
1725             default:
1726                 break;
1727         }
1728         return OK;
1729     }
1730
1731     if (gap)
1732         switch (winX (STATUS)) {
1733             case NOTOK:
1734                 return NOTOK;
1735
1736             case OK:
1737                 printf ("%s: gap in ID:s, last seen %d, lowest present %d\n",
1738                     myname ? myname : fmsh ? fmsh : mp->foldpath, gap - 1,
1739                     readid (mp->lowmsg));
1740                 fflush (stdout);
1741                 fflush (stderr);
1742                 _exit (0);      /* NOTREACHED */
1743
1744             default:
1745                 gap = 0;
1746                 return OK;
1747         }
1748
1749     if (mp->lowmsg != lastlow
1750             || mp->curmsg != lastcur
1751             || mp->hghmsg != lasthgh
1752             || mp->nummsg != lastnum)
1753         switch (winX (STATUS)) {
1754             case NOTOK:
1755                 return NOTOK;
1756
1757             case OK:
1758                 foldcmd (NULL);
1759                 fflush (stdout);
1760                 fflush (stderr);
1761                 _exit (0);      /* NOTREACHED */
1762
1763             default:
1764                 lastlow = mp->lowmsg;
1765                 lastcur = mp->curmsg;
1766                 lasthgh = mp->hghmsg;
1767                 lastnum = mp->nummsg;
1768                 return OK;
1769         }
1770
1771     return OK;
1772 }
1773
1774
1775 static int
1776 pQRY2 (void)
1777 {
1778     int i, j, k, msgnum, n;
1779     static int cur = 0,
1780                num = 0,
1781                lo = 0,
1782                hi = 0;
1783
1784     if (mp->nummsg == 0 && mp->nummsg != num)
1785         switch (winX (SCAN)) {
1786             case NOTOK:
1787                 return NOTOK;
1788
1789             case OK:
1790                 printf ("empty!");
1791                 fflush (stdout);
1792                 fflush (stderr);
1793                 _exit (0);      /* NOTREACHED */
1794
1795             default:
1796                 num = mp->nummsg;
1797                 return OK;
1798         }
1799     num = mp->nummsg;
1800
1801     i = 0;
1802     j = (k = windows[SCAN]) / 2;
1803     for (msgnum = mp->curmsg; msgnum <= mp->hghmsg; msgnum++)
1804         if (does_exist (mp, msgnum))
1805             i++;
1806     if (i-- > 0) {
1807         if (topcur)
1808             k = i >= k ? 1 : k - i;
1809         else
1810             k -= i > j ? j : i;
1811     }
1812
1813     i = j = 0;
1814     n = 1;
1815     for (msgnum = mp->curmsg; msgnum >= mp->lowmsg; msgnum--)
1816         if (does_exist (mp, msgnum)) {
1817             i = msgnum;
1818             if (j == 0)
1819                 j = msgnum;
1820             if (n++ >= k)
1821                 break;
1822         }
1823     for (msgnum = mp->curmsg + 1; msgnum <= mp->hghmsg; msgnum++)
1824         if (does_exist (mp, msgnum)) {
1825             if (i == 0)
1826                 i = msgnum;
1827             j = msgnum;
1828             if (n++ >= windows[SCAN])
1829                 break;
1830         }
1831     if (!topcur
1832             && lo > 0
1833             && hi > 0
1834             && does_exist (mp, lo)
1835             && does_exist (mp, hi)
1836             && (lo < mp->curmsg
1837                     || (lo == mp->curmsg && lo == mp->lowmsg))
1838             && (mp->curmsg < hi
1839                     || (hi == mp->curmsg && hi == mp->hghmsg))
1840             && hi - lo == j - i)
1841         i = lo, j = hi;
1842
1843     if (mp->curmsg != cur || modified)
1844         switch (winN (NULLCMD, SCAN, 0)) {
1845             case NOTOK:
1846                 return NOTOK;
1847
1848             case OK:
1849                 return OK;
1850
1851             default:
1852                 scanrange (lo = i, hi = j);
1853                 cur = mp->curmsg;
1854                 winR (NULLCMD);
1855                 return OK;
1856         }
1857
1858     return OK;
1859 }
1860
1861
1862 static int
1863 pCMD (char *str, struct swit *sw, struct Cmd *cmdp)
1864 {
1865     int i;
1866
1867     if (*str == '?')
1868         switch (winX (DISPLAY)) {
1869             case NOTOK:
1870                 return NOTOK;
1871
1872             case OK:
1873                 printf ("commands:\n");
1874                 print_sw (ALL, sw, "", stdout);
1875                 printf ("type ``quit'' to leave %s\n", invo_name);
1876                 fflush (stdout);
1877                 fflush (stderr);
1878                 _exit (0);      /* NOTREACHED */
1879
1880             default:
1881                 rc2peer (RC_EOF, 0, NULL);
1882                 return NOTOK;
1883         }
1884
1885     if (parse (str, cmdp) == NOTOK)
1886         return NOTOK;
1887
1888     switch (i = smatch (cmdp->args[0], sw)) {
1889         case AMBIGSW:
1890             switch (winX (DISPLAY)) {
1891                 case NOTOK:
1892                     return NOTOK;
1893
1894                 case OK:
1895                     ambigsw (cmdp->args[0], sw);
1896                     fflush (stdout);
1897                     fflush (stderr);
1898                     _exit (0);  /* NOTREACHED */
1899
1900                 default:
1901                     rc2peer (RC_EOF, 0, NULL);
1902                     return NOTOK;
1903             }
1904
1905         case UNKWNSW:
1906             fmt2peer (RC_ERR,
1907                     "say what: ``%s'' -- type ? (or help) for help",
1908                     cmdp->args[0]);
1909             return NOTOK;
1910
1911         default:
1912             return i;
1913     }
1914 }
1915
1916
1917 static int
1918 pFIN (void)
1919 {
1920     int status;
1921
1922     switch (m_setjmp (peerenv)) {
1923         case OK:
1924             SIGNAL (SIGALRM, alrmser);
1925             alarm (ALARM);
1926
1927             status = peerwait ();
1928
1929             alarm (0);
1930             return status;
1931
1932         default:
1933             return NOTOK;
1934     }
1935 }
1936
1937
1938 static int
1939 peerwait (void)
1940 {
1941     struct record rcs, *rc;
1942
1943     rc = &rcs;
1944     initrc (rc);
1945
1946     switch (peer2rc (rc)) {
1947         case RC_QRY:
1948         case RC_CMD:
1949             rc2peer (RC_FIN, 0, NULL);
1950             return OK;
1951
1952         case RC_XXX:
1953             advise (NULL, "%s", rc->rc_data);
1954             return NOTOK;
1955
1956         default:
1957             fmt2peer (RC_FIN, "pLOOP protocol screw-up");
1958             return NOTOK;
1959     }
1960 }
1961
1962
1963 static int
1964 ttyNaux (struct Cmd *cmdp, char *s)
1965 {
1966     struct record rcs, *rc;
1967
1968     rc = &rcs;
1969     initrc (rc);
1970
1971     if (cmdp && init_io (cmdp, vmh) == NOTOK)
1972         return NOTOK;
1973
1974     /* XXX: fseek() too tricky for our own good */
1975     if (!fmsh)
1976         fseek (fp, 0L, SEEK_SET);
1977
1978     vmhtty = NOTOK;
1979     switch (rc2rc (RC_TTY, s ? strlen (s) : 0, s, rc)) {
1980         case RC_ACK:
1981             vmhtty = OK;        /* fall */
1982         case RC_ERR:
1983             break;
1984
1985         case RC_XXX:
1986             padios (NULL, "%s", rc->rc_data);/* NOTREACHED */
1987
1988         default:
1989             fmt2peer (RC_ERR, "pTTY protocol screw-up");
1990             done (1);           /* NOTREACHED */
1991     }
1992
1993 #ifdef SIGTSTP
1994     SIGNAL (SIGTSTP, tstat);
1995 #endif
1996     return vmhtty;
1997 }
1998
1999
2000 static int
2001 ttyR (struct Cmd *cmdp)
2002 {
2003     struct record rcs, *rc;
2004
2005     rc = &rcs;
2006
2007 #ifdef SIGTSTP
2008     SIGNAL (SIGTSTP, SIG_IGN);
2009 #endif
2010
2011     if (vmhtty != OK)
2012         return NOTOK;
2013
2014     initrc (rc);
2015
2016     if (cmdp)
2017         fin_io (cmdp, 0);
2018
2019     vmhtty = NOTOK;
2020     switch (rc2rc (RC_EOF, 0, NULL, rc)) {
2021         case RC_ACK:
2022             rc2peer (RC_EOF, 0, NULL);
2023             return OK;
2024
2025         case RC_XXX:
2026             padios (NULL, "%s", rc->rc_data);/* NOTREACHED */
2027
2028         default:
2029             fmt2peer (RC_ERR, "pTTY protocol screw-up");
2030             done (1);           /* NOTREACHED */
2031     }
2032
2033     return 1;  /* dead code to satisfy compiler */
2034 }
2035
2036
2037 static int
2038 winN (struct Cmd *cmdp, int n, int eof)
2039 {
2040     int i, pd[2];
2041     char buffer[BUFSIZ];
2042     struct record rcs, *rc;
2043
2044     rc = &rcs;
2045     if (vmhpid == NOTOK)
2046         return OK;
2047
2048     initrc (rc);
2049
2050     /* XXX: fseek() too tricky for our own good */
2051     if (!fmsh)
2052         fseek (fp, 0L, SEEK_SET);
2053
2054     vmhpid = OK;
2055
2056     snprintf (buffer, sizeof(buffer), "%d", n);
2057     switch (str2rc (RC_WIN, buffer, rc)) {
2058         case RC_ACK:
2059             break;
2060
2061         case RC_ERR:
2062             return NOTOK;
2063
2064         case RC_XXX:
2065             padios (NULL, "%s", rc->rc_data);
2066
2067         default:
2068             fmt2peer (RC_ERR, "pWIN protocol screw-up");
2069             done (1);
2070     }
2071
2072     if (pipe (pd) == NOTOK) {
2073         err2peer (RC_ERR, "pipe", "unable to");
2074         return NOTOK;
2075     }
2076
2077     switch (vmhpid = fork()) {
2078         case NOTOK:
2079             err2peer (RC_ERR, "fork", "unable to");
2080             close (pd[0]);
2081             close (pd[1]);
2082             return NOTOK;
2083
2084         case OK:
2085             close (pd[1]);
2086             SIGNAL (SIGPIPE, SIG_IGN);
2087             while ((i = read (pd[0], buffer, sizeof buffer)) > 0)
2088                 switch (rc2rc (RC_DATA, i, buffer, rc)) {
2089                     case RC_ACK:
2090                         break;
2091
2092                     case RC_ERR:
2093                         _exit (1);
2094
2095                     case RC_XXX:
2096                         advise (NULL, "%s", rc->rc_data);
2097                         _exit (2);
2098
2099                     default:
2100                         fmt2peer (RC_ERR, "pWIN protocol screw-up");
2101                         _exit (2);
2102                 }
2103             if (i == OK)
2104                 switch (rc2rc (RC_EOF, 0, NULL, rc)) {
2105                     case RC_ACK:
2106                         if (eof)
2107                             rc2peer (RC_EOF, 0, NULL);
2108                         i = 0;
2109                         break;
2110
2111                     case RC_XXX:
2112                         advise (NULL, "%s", rc->rc_data);
2113                         i = 2;
2114                         break;
2115
2116                     default:
2117                         fmt2peer (RC_ERR, "pWIN protocol screw-up");
2118                         i = 2;
2119                         break;
2120                 }
2121             if (i == NOTOK)
2122                 err2peer (RC_ERR, "pipe", "error reading from");
2123             close (pd[0]);
2124             _exit (i != NOTOK ? i : 1);
2125
2126         default:
2127             if ((vmhfd0 = dup (fileno (stdin))) == NOTOK)
2128                 padios ("standard input", "unable to dup");
2129             if ((vmhfd1 = dup (fileno (stdout))) == NOTOK)
2130                 padios ("standard output", "unable to dup");
2131             if ((vmhfd2 = dup (fileno (stderr))) == NOTOK)
2132                 padios ("diagnostic output", "unable to dup");
2133
2134             close (0);
2135             if ((i = open ("/dev/null", O_RDONLY)) != NOTOK && i != fileno (stdin)) {
2136                 dup2 (i, fileno (stdin));
2137                 close (i);
2138             }
2139
2140             fflush (stdout);
2141             if (dup2 (pd[1], fileno (stdout)) == NOTOK)
2142                 padios ("standard output", "unable to dup2");
2143             clearerr (stdout);
2144
2145             fflush (stderr);
2146             if (dup2 (pd[1], fileno (stderr)) == NOTOK)
2147                 padios ("diagnostic output", "unable to dup2");
2148             clearerr (stderr);
2149
2150             if (cmdp && init_io (cmdp, 0) == NOTOK)
2151                 return NOTOK;
2152             pstat = SIGNAL (SIGPIPE, pipeser);
2153             broken_pipe = 1;
2154
2155             close (pd[0]);
2156             close (pd[1]);
2157
2158             return vmhpid;
2159     }
2160 }
2161
2162
2163 static int
2164 winR (struct Cmd *cmdp)
2165 {
2166     int status;
2167
2168     if (vmhpid <= OK)
2169         return NOTOK;
2170
2171     if (cmdp)
2172         fin_io (cmdp, 0);
2173
2174     if (dup2 (vmhfd0, fileno (stdin)) == NOTOK)
2175         padios ("standard input", "unable to dup2");
2176     clearerr (stdin);
2177     close (vmhfd0);
2178
2179     fflush (stdout);
2180     if (dup2 (vmhfd1, fileno (stdout)) == NOTOK)
2181         padios ("standard output", "unable to dup2");
2182     clearerr (stdout);
2183     close (vmhfd1);
2184
2185     fflush (stderr);
2186     if (dup2 (vmhfd2, fileno (stderr)) == NOTOK)
2187         padios ("diagnostic output", "unable to dup2");
2188     clearerr (stderr);
2189     close (vmhfd2);
2190
2191     SIGNAL (SIGPIPE, pstat);
2192
2193     if ((status = pidwait (vmhpid, OK)) == 2)
2194         done (1);
2195
2196     vmhpid = OK;
2197     return (status == 0 ? OK : NOTOK);
2198 }
2199
2200
2201 static int
2202 winX (int n)
2203 {
2204     int i, pid, pd[2];
2205     char buffer[BUFSIZ];
2206     struct record rcs, *rc;
2207
2208     rc = &rcs;
2209     initrc (rc);
2210
2211     /* XXX: fseek() too tricky for our own good */
2212     if (!fmsh)
2213         fseek (fp, 0L, SEEK_SET);
2214
2215     snprintf (buffer, sizeof(buffer), "%d", n);
2216     switch (str2rc (RC_WIN, buffer, rc)) {
2217         case RC_ACK:
2218             break;
2219
2220         case RC_ERR:
2221             return NOTOK;
2222
2223         case RC_XXX:
2224             padios (NULL, "%s", rc->rc_data);
2225
2226         default:
2227             fmt2peer (RC_ERR, "pWIN protocol screw-up");
2228             done (1);
2229     }
2230
2231     if (pipe (pd) == NOTOK) {
2232         err2peer (RC_ERR, "pipe", "unable to");
2233         return NOTOK;
2234     }
2235
2236     switch (pid = fork ()) {
2237         case NOTOK:
2238             err2peer (RC_ERR, "fork", "unable to");
2239             close (pd[0]);
2240             close (pd[1]);
2241             return NOTOK;
2242
2243         case OK:
2244             close (fileno (stdin));
2245             if ((i = open ("/dev/null", O_RDONLY)) != NOTOK && i != fileno (stdin)) {
2246                 dup2 (i, fileno (stdin));
2247                 close (i);
2248             }
2249             dup2 (pd[1], fileno (stdout));
2250             dup2 (pd[1], fileno (stderr));
2251             close (pd[0]);
2252             close (pd[1]);
2253             vmhpid = NOTOK;
2254             return OK;
2255
2256         default:
2257             close (pd[1]);
2258             while ((i = read (pd[0], buffer, sizeof buffer)) > 0)
2259                 switch (rc2rc (RC_DATA, i, buffer, rc)) {
2260                     case RC_ACK:
2261                         break;
2262
2263                     case RC_ERR:
2264                         close (pd[0]);
2265                         pidwait (pid, OK);
2266                         return NOTOK;
2267
2268                     case RC_XXX:
2269                         padios (NULL, "%s", rc->rc_data);
2270
2271                     default:
2272                         fmt2peer (RC_ERR, "pWIN protocol screw-up");
2273                         done (1);
2274                 }
2275             if (i == OK)
2276                 switch (rc2rc (RC_EOF, 0, NULL, rc)) {
2277                     case RC_ACK:
2278                         break;
2279
2280                     case RC_XXX:
2281                         padios (NULL, "%s", rc->rc_data);
2282
2283                     default:
2284                         fmt2peer (RC_ERR, "pWIN protocol screw-up");
2285                         done (1);
2286                 }
2287             if (i == NOTOK)
2288                 err2peer (RC_ERR, "pipe", "error reading from");
2289
2290             close (pd[0]);
2291             pidwait (pid, OK);
2292             return (i != NOTOK ? pid : NOTOK);
2293     }
2294 }
2295
2296
2297 void
2298 padios (char *what, char *fmt, ...)
2299 {
2300     va_list ap;
2301
2302     va_start(ap, fmt);
2303     if (vmh) {
2304         verr2peer (RC_FIN, what, fmt, ap);
2305         rcdone ();
2306     } else {
2307         advertise (what, NULL, fmt, ap);
2308     }
2309     va_end(ap);
2310
2311     done (1);
2312 }
2313
2314
2315 void
2316 padvise (char *what, char *fmt, ...)
2317 {
2318     va_list ap;
2319
2320     va_start(ap, fmt);
2321     if (vmh) {
2322         verr2peer (RC_ERR, what, fmt, ap);
2323     } else {
2324         advertise (what, NULL, fmt, ap);
2325     }
2326     va_end(ap);
2327 }