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