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

   1
   2 /*
   3  * burst.c -- explode digests into individual messages
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13
  14 static struct swit switches[] = {
  15 #define INPLSW  0
  16     { "inplace", 0 },
  17 #define NINPLSW 1
  18     { "noinplace", 0 },
  19 #define QIETSW  2
  20     { "quiet", 0 },
  21 #define NQIETSW 3
  22     { "noquiet", 0 },
  23 #define VERBSW  4
  24     { "verbose", 0 },
  25 #define NVERBSW 5
  26     { "noverbose", 0 },
  27 #define VERSIONSW 6
  28     { "version", 0 },
  29 #define HELPSW  7
  30     { "help", 0 },
  31     { NULL, 0 }
  32 };
  33
  34 static char delim3[] = "-------";
  35
  36 struct smsg {
  37     long s_start;
  38     long s_stop;
  39 };
  40
  41 /*
  42  * static prototypes
  43  */
  44 static int find_delim (int, struct smsg *);
  45 static void burst (struct msgs **, int, struct smsg *, int, int, int, char *);
  46 static void cpybrst (FILE *, FILE *, char *, char *, int);
  47
  48
  49 int
  50 main (int argc, char **argv)
  51 {
  52     int inplace = 0, quietsw = 0, verbosw = 0;
  53     int msgp = 0, hi, msgnum, numburst;
  54     char *cp, *maildir, *folder = NULL, buf[BUFSIZ];
  55     char **argp, **arguments, *msgs[MAXARGS];
  56     struct smsg *smsgs;
  57     struct msgs *mp;
  58
  59 #ifdef LOCALE
  60     setlocale(LC_ALL, "");
  61 #endif
  62     invo_name = r1bindex (argv[0], '/');
  63
  64     /* read user profile/context */
  65     context_read();
  66
  67     arguments = getarguments (invo_name, argc, argv, 1);
  68     argp = arguments;
  69
  70     while ((cp = *argp++)) {
  71         if (*cp == '-') {
  72             switch (smatch (++cp, switches)) {
  73             case AMBIGSW:
  74                 ambigsw (cp, switches);
  75                 done (1);
  76             case UNKWNSW:
  77                 adios (NULL, "-%s unknown\n", cp);
  78
  79             case HELPSW:
  80                 snprintf (buf, sizeof(buf), "%s [+folder] [msgs] [switches]",
  81                         invo_name);
  82                 print_help (buf, switches, 1);
  83                 done (1);
  84             case VERSIONSW:
  85                 print_version(invo_name);
  86                 done (1);
  87
  88             case INPLSW:
  89                 inplace++;
  90                 continue;
  91             case NINPLSW:
  92                 inplace = 0;
  93                 continue;
  94
  95             case QIETSW:
  96                 quietsw++;
  97                 continue;
  98             case NQIETSW:
  99                 quietsw = 0;
 100                 continue;
 101
 102             case VERBSW:
 103                 verbosw++;
 104                 continue;
 105             case NVERBSW:
 106                 verbosw = 0;
 107                 continue;
 108             }
 109         }
 110         if (*cp == '+' || *cp == '@') {
 111             if (folder)
 112                 adios (NULL, "only one folder at a time!");
 113             else
 114                 folder = pluspath (cp);
 115         } else {
 116             msgs[msgp++] = cp;
 117         }
 118     }
 119
 120     if (!context_find ("path"))
 121         free (path ("./", TFOLDER));
 122     if (!msgp)
 123         msgs[msgp++] = "cur";
 124     if (!folder)
 125         folder = getfolder (1);
 126     maildir = m_maildir (folder);
 127
 128     if (chdir (maildir) == NOTOK)
 129         adios (maildir, "unable to change directory to");
 130
 131     /* read folder and create message structure */
 132     if (!(mp = folder_read (folder)))
 133         adios (NULL, "unable to read folder %s", folder);
 134
 135     /* check for empty folder */
 136     if (mp->nummsg == 0)
 137         adios (NULL, "no messages in %s", folder);
 138
 139     /* parse all the message ranges/sequences and set SELECTED */
 140     for (msgnum = 0; msgnum < msgp; msgnum++)
 141         if (!m_convert (mp, msgs[msgnum]))
 142             done (1);
 143     seq_setprev (mp);   /* set the previous-sequence */
 144
 145     smsgs = (struct smsg *)
 146         calloc ((size_t) (MAXFOLDER + 2), sizeof(*smsgs));
 147     if (smsgs == NULL)
 148         adios (NULL, "unable to allocate burst storage");
 149
 150     hi = mp->hghmsg + 1;
 151
 152     /* burst all the SELECTED messages */
 153     for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
 154         if (is_selected (mp, msgnum)) {
 155             if ((numburst = find_delim (msgnum, smsgs)) >= 1) {
 156                 if (verbosw)
 157                     printf ("%d message%s exploded from digest %d\n",
 158                             numburst, numburst > 1 ? "s" : "", msgnum);
 159                 burst (&mp, msgnum, smsgs, numburst, inplace, verbosw, maildir);
 160             } else {
 161                 if (numburst == 0) {
 162                     if (!quietsw)
 163                         admonish (NULL, "message %d not in digest format",
 164                                   msgnum);
 165                 }  /* this pair of braces was missing before 1999-07-15 */
 166                 else
 167                     adios (NULL, "burst() botch -- you lose big");
 168             }
 169         }
 170     }
 171
 172     free ((char *) smsgs);
 173     context_replace (pfolder, folder);  /* update current folder */
 174
 175     /*
 176      * If -inplace is given, then the first message burst becomes
 177      * the current message (which will now show a table of contents).
 178      * Otherwise, the first message extracted from the first digest
 179      * becomes the current message.
 180      */
 181     if (inplace) {
 182         if (mp->lowsel != mp->curmsg)
 183             seq_setcur (mp, mp->lowsel);
 184     } else {
 185         if (hi <= mp->hghmsg)
 186             seq_setcur (mp, hi);
 187     }
 188
 189     seq_save (mp);      /* synchronize message sequences */
 190     context_save ();    /* save the context file         */
 191     folder_free (mp);   /* free folder/message structure */
 192     return done (0);
 193 }
 194
 195
 196 /*
 197  * Scan the message and find the beginning and
 198  * end of all the messages in the digest.
 199  */
 200
 201 static int
 202 find_delim (int msgnum, struct smsg *smsgs)
 203 {
 204     int ld3, wasdlm, msgp;
 205     long pos;
 206     char c, *msgnam;
 207     int cc;
 208     char buffer[BUFSIZ];
 209     FILE *in;
 210
 211     ld3 = strlen (delim3);
 212
 213     if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
 214         adios (msgnam, "unable to read message");
 215
 216     for (msgp = 0, pos = 0L; msgp <= MAXFOLDER;) {
 217         while (fgets (buffer, sizeof(buffer), in) && buffer[0] == '\n')
 218             pos += (long) strlen (buffer);
 219         if (feof (in))
 220             break;
 221         fseek (in, pos, SEEK_SET);
 222         smsgs[msgp].s_start = pos;
 223
 224         for (c = 0; fgets (buffer, sizeof(buffer), in); c = buffer[0]) {
 225             if (strncmp (buffer, delim3, ld3) == 0
 226                     && (msgp == 1 || c == '\n')
 227                     && ((cc = peekc (in)) == '\n' || cc == EOF))
 228                 break;
 229             else
 230                 pos += (long) strlen (buffer);
 231         }
 232
 233         wasdlm = strncmp (buffer, delim3, ld3) == 0;
 234         if (smsgs[msgp].s_start != pos)
 235             smsgs[msgp++].s_stop = (c == '\n' && wasdlm) ? pos - 1 : pos;
 236         if (feof (in)) {
 237 #if 0
 238             if (wasdlm) {
 239                 smsgs[msgp - 1].s_stop -= ((long) strlen (buffer) + 1);
 240                 msgp++;         /* fake "End of XXX Digest" */
 241             }
 242 #endif
 243             break;
 244         }
 245         pos += (long) strlen (buffer);
 246     }
 247
 248     fclose (in);
 249     return (msgp - 1);          /* toss "End of XXX Digest" */
 250 }
 251
 252
 253 /*
 254  * Burst out the messages in the digest into the folder
 255  */
 256
 257 static void
 258 burst (struct msgs **mpp, int msgnum, struct smsg *smsgs, int numburst,
 259         int inplace, int verbosw, char *maildir)
 260 {
 261     int i, j, mode;
 262     char *msgnam;
 263     char f1[BUFSIZ], f2[BUFSIZ], f3[BUFSIZ];
 264     FILE *in, *out;
 265     struct stat st;
 266     struct msgs *mp;
 267
 268     if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
 269         adios (msgnam, "unable to read message");
 270
 271     mode = fstat (fileno(in), &st) != NOTOK ? (st.st_mode & 0777) : m_gmprot();
 272     mp = *mpp;
 273
 274     /*
 275      * See if we have enough space in the folder
 276      * structure for all the new messages.
 277      */
 278     if ((mp->hghmsg + numburst > mp->hghoff) &&
 279         !(mp = folder_realloc (mp, mp->lowoff, mp->hghmsg + numburst)))
 280         adios (NULL, "unable to allocate folder storage");
 281     *mpp = mp;
 282
 283     j = mp->hghmsg;             /* old value */
 284     mp->hghmsg += numburst;
 285     mp->nummsg += numburst;
 286
 287     /*
 288      * If this is not the highest SELECTED message, then
 289      * increment mp->hghsel by numburst, since the highest
 290      * SELECTED is about to be slid down by that amount.
 291      */
 292     if (msgnum < mp->hghsel)
 293         mp->hghsel += numburst;
 294
 295     /*
 296      * If -inplace is given, renumber the messages after the
 297      * source message, to make room for each of the messages
 298      * contained within the digest.
 299      *
 300      * This is equivalent to refiling a message from the point
 301      * of view of the external hooks.
 302      */
 303     if (inplace) {
 304         for (i = mp->hghmsg; j > msgnum; i--, j--) {
 305             strncpy (f1, m_name (i), sizeof(f1));
 306             strncpy (f2, m_name (j), sizeof(f2));
 307             if (does_exist (mp, j)) {
 308                 if (verbosw)
 309                     printf ("message %d becomes message %d\n", j, i);
 310
 311                 if (rename (f2, f1) == NOTOK)
 312                     admonish (f1, "unable to rename %s to", f2);
 313
 314                 (void)snprintf(f1, sizeof (f1), "%s/%d", maildir, i);
 315                 (void)snprintf(f2, sizeof (f2), "%s/%d", maildir, j);
 316                 ext_hook("ref-hook", f1, f2);
 317
 318                 copy_msg_flags (mp, i, j);
 319                 clear_msg_flags (mp, j);
 320                 mp->msgflags |= SEQMOD;
 321             }
 322         }
 323     }
 324
 325     unset_selected (mp, msgnum);
 326
 327     /* new hghmsg is hghmsg + numburst
 328      *
 329      * At this point, there is an array of numburst smsgs, each element of
 330      * which contains the starting and stopping offsets (seeks) of the message
 331      * in the digest.  The inplace flag is set if the original digest is replaced
 332      * by a message containing the table of contents.  smsgs[0] is that table of
 333      * contents.  Go through the message numbers in reverse order (high to low).
 334      *
 335      * Set f1 to the name of the destination message, f2 to the name of a scratch
 336      * file.  Extract a message from the digest to the scratch file.  Move the
 337      * original message to a backup file if the destination message number is the
 338      * same as the number of the original message, which only happens if the
 339      * inplace flag is set.  Then move the scratch file to the destination message.
 340      *
 341      * Moving the original message to the backup file is equivalent to deleting the
 342      * message from the point of view of the external hooks.  And bursting each
 343      * message is equivalent to adding a new message.
 344      */
 345
 346     i = inplace ? msgnum + numburst : mp->hghmsg;
 347     for (j = numburst; j >= (inplace ? 0 : 1); i--, j--) {
 348         strncpy (f1, m_name (i), sizeof(f1));
 349         strncpy (f2, m_scratch ("", invo_name), sizeof(f2));
 350         if (verbosw && i != msgnum)
 351             printf ("message %d of digest %d becomes message %d\n", j, msgnum, i);
 352
 353         if ((out = fopen (f2, "w")) == NULL)
 354             adios (f2, "unable to write message");
 355         chmod (f2, mode);
 356         fseek (in, smsgs[j].s_start, SEEK_SET);
 357         cpybrst (in, out, msgnam, f2,
 358                 (int) (smsgs[j].s_stop - smsgs[j].s_start));
 359         fclose (out);
 360
 361         if (i == msgnum) {
 362             strncpy (f3, m_backup (f1), sizeof(f3));
 363             if (rename (f1, f3) == NOTOK)
 364                 admonish (f3, "unable to rename %s to", f1);
 365
 366             (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
 367             ext_hook("del-hook", f3, (char *)0);
 368         }
 369         if (rename (f2, f1) == NOTOK)
 370             admonish (f1, "unable to rename %s to", f2);
 371
 372         (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
 373         ext_hook("add-hook", f3, (char *)0);
 374
 375         copy_msg_flags (mp, i, msgnum);
 376         mp->msgflags |= SEQMOD;
 377     }
 378
 379     fclose (in);
 380 }
 381
 382
 383 #define S1  0
 384 #define S2  1
 385 #define S3  2
 386
 387 /*
 388  * Copy a mesage which is being burst out of a digest.
 389  * It will remove any "dashstuffing" in the message.
 390  */
 391
 392 static void
 393 cpybrst (FILE *in, FILE *out, char *ifile, char *ofile, int len)
 394 {
 395     register int c, state;
 396
 397     for (state = S1; (c = fgetc (in)) != EOF && len > 0; len--) {
 398         if (c == 0)
 399             continue;
 400         switch (state) {
 401             case S1:
 402                 switch (c) {
 403                     case '-':
 404                         state = S3;
 405                         break;
 406
 407                     default:
 408                         state = S2;
 409                     case '\n':
 410                         fputc (c, out);
 411                         break;
 412                 }
 413                 break;
 414
 415             case S2:
 416                 switch (c) {
 417                     case '\n':
 418                         state = S1;
 419                     default:
 420                         fputc (c, out);
 421                         break;
 422                 }
 423                 break;
 424
 425             case S3:
 426                 switch (c) {
 427                     case ' ':
 428                         state = S2;
 429                         break;
 430
 431                     default:
 432                         state = (c == '\n') ? S1 : S2;
 433                         fputc ('-', out);
 434                         fputc (c, out);
 435                         break;
 436                 }
 437                 break;
 438         }
 439     }
 440
 441     if (ferror (in) && !feof (in))
 442         adios (ifile, "error reading");
 443     if (ferror (out))
 444         adios (ofile, "error writing");
 445 }