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

   1
   2 /*
   3  * burst.c -- explode digests into individual messages
   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 #include <h/mh.h>
  11
  12 static struct swit switches[] = {
  13 #define INPLSW  0
  14     { "inplace", 0 },
  15 #define NINPLSW 1
  16     { "noinplace", 0 },
  17 #define QIETSW  2
  18     { "quiet", 0 },
  19 #define NQIETSW 3
  20     { "noquiet", 0 },
  21 #define VERBSW  4
  22     { "verbose", 0 },
  23 #define NVERBSW 5
  24     { "noverbose", 0 },
  25 #define VERSIONSW 6
  26     { "version", 0 },
  27 #define HELPSW  7
  28     { "help", 0 },
  29     { NULL, 0 }
  30 };
  31
  32 static char delim3[] = "-------";
  33
  34 struct smsg {
  35     long s_start;
  36     long s_stop;
  37 };
  38
  39 /*
  40  * static prototypes
  41  */
  42 static int find_delim (int, struct smsg *);
  43 static void burst (struct msgs **, int, struct smsg *, int, int, int, char *);
  44 static void cpybrst (FILE *, FILE *, char *, char *, int);
  45
  46
  47 int
  48 main (int argc, char **argv)
  49 {
  50     int inplace = 0, quietsw = 0, verbosw = 0;
  51     int msgp = 0, hi, msgnum, numburst;
  52     char *cp, *maildir, *folder = NULL, buf[BUFSIZ];
  53     char **argp, **arguments, *msgs[MAXARGS];
  54     struct smsg *smsgs;
  55     struct msgs *mp;
  56
  57 #ifdef LOCALE
  58     setlocale(LC_ALL, "");
  59 #endif
  60     invo_name = r1bindex (argv[0], '/');
  61
  62     /* read user profile/context */
  63     context_read();
  64
  65     arguments = getarguments (invo_name, argc, argv, 1);
  66     argp = arguments;
  67
  68     while ((cp = *argp++)) {
  69         if (*cp == '-') {
  70             switch (smatch (++cp, switches)) {
  71             case AMBIGSW:
  72                 ambigsw (cp, switches);
  73                 done (1);
  74             case UNKWNSW:
  75                 adios (NULL, "-%s unknown\n", cp);
  76
  77             case HELPSW:
  78                 snprintf (buf, sizeof(buf), "%s [+folder] [msgs] [switches]",
  79                         invo_name);
  80                 print_help (buf, switches, 1);
  81                 done (1);
  82             case VERSIONSW:
  83                 print_version(invo_name);
  84                 done (1);
  85
  86             case INPLSW:
  87                 inplace++;
  88                 continue;
  89             case NINPLSW:
  90                 inplace = 0;
  91                 continue;
  92
  93             case QIETSW:
  94                 quietsw++;
  95                 continue;
  96             case NQIETSW:
  97                 quietsw = 0;
  98                 continue;
  99
 100             case VERBSW:
 101                 verbosw++;
 102                 continue;
 103             case NVERBSW:
 104                 verbosw = 0;
 105                 continue;
 106             }
 107         }
 108         if (*cp == '+' || *cp == '@') {
 109             if (folder)
 110                 adios (NULL, "only one folder at a time!");
 111             else
 112                 folder = pluspath (cp);
 113         } else {
 114             msgs[msgp++] = cp;
 115         }
 116     }
 117
 118     if (!context_find ("path"))
 119         free (path ("./", TFOLDER));
 120     if (!msgp)
 121         msgs[msgp++] = "cur";
 122     if (!folder)
 123         folder = getfolder (1);
 124     maildir = m_maildir (folder);
 125
 126     if (chdir (maildir) == NOTOK)
 127         adios (maildir, "unable to change directory to");
 128
 129     /* read folder and create message structure */
 130     if (!(mp = folder_read (folder)))
 131         adios (NULL, "unable to read folder %s", folder);
 132
 133     /* check for empty folder */
 134     if (mp->nummsg == 0)
 135         adios (NULL, "no messages in %s", folder);
 136
 137     /* parse all the message ranges/sequences and set SELECTED */
 138     for (msgnum = 0; msgnum < msgp; msgnum++)
 139         if (!m_convert (mp, msgs[msgnum]))
 140             done (1);
 141     seq_setprev (mp);   /* set the previous-sequence */
 142
 143     smsgs = (struct smsg *)
 144         calloc ((size_t) (MAXFOLDER + 2), sizeof(*smsgs));
 145     if (smsgs == NULL)
 146         adios (NULL, "unable to allocate burst storage");
 147
 148     hi = mp->hghmsg + 1;
 149
 150     /* burst all the SELECTED messages */
 151     for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
 152         if (is_selected (mp, msgnum)) {
 153             if ((numburst = find_delim (msgnum, smsgs)) >= 1) {
 154                 if (verbosw)
 155                     printf ("%d message%s exploded from digest %d\n",
 156                             numburst, numburst > 1 ? "s" : "", msgnum);
 157                 burst (&mp, msgnum, smsgs, numburst, inplace, verbosw, maildir);
 158             } else {
 159                 if (numburst == 0) {
 160                     if (!quietsw)
 161                         admonish (NULL, "message %d not in digest format",
 162                                   msgnum);
 163                 }  /* this pair of braces was missing before 1999-07-15 */
 164                 else
 165                     adios (NULL, "burst() botch -- you lose big");
 166             }
 167         }
 168     }
 169
 170     free ((char *) smsgs);
 171     context_replace (pfolder, folder);  /* update current folder */
 172
 173     /*
 174      * If -inplace is given, then the first message burst becomes
 175      * the current message (which will now show a table of contents).
 176      * Otherwise, the first message extracted from the first digest
 177      * becomes the current message.
 178      */
 179     if (inplace) {
 180         if (mp->lowsel != mp->curmsg)
 181             seq_setcur (mp, mp->lowsel);
 182     } else {
 183         if (hi <= mp->hghmsg)
 184             seq_setcur (mp, hi);
 185     }
 186
 187     seq_save (mp);      /* synchronize message sequences */
 188     context_save ();    /* save the context file         */
 189     folder_free (mp);   /* free folder/message structure */
 190     done (0);
 191     return 1;
 192 }
 193
 194
 195 /*
 196  * Scan the message and find the beginning and
 197  * end of all the messages in the digest.
 198  */
 199
 200 static int
 201 find_delim (int msgnum, struct smsg *smsgs)
 202 {
 203     int ld3, wasdlm, msgp;
 204     long pos;
 205     char c, *msgnam;
 206     int cc;
 207     char buffer[BUFSIZ];
 208     FILE *in;
 209
 210     ld3 = strlen (delim3);
 211
 212     if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
 213         adios (msgnam, "unable to read message");
 214
 215     for (msgp = 0, pos = 0L; msgp <= MAXFOLDER;) {
 216         while (fgets (buffer, sizeof(buffer), in) && buffer[0] == '\n')
 217             pos += (long) strlen (buffer);
 218         if (feof (in))
 219             break;
 220         fseek (in, pos, SEEK_SET);
 221         smsgs[msgp].s_start = pos;
 222
 223         for (c = 0; fgets (buffer, sizeof(buffer), in); c = buffer[0]) {
 224             if (strncmp (buffer, delim3, ld3) == 0
 225                     && (msgp == 1 || c == '\n')
 226                     && ((cc = peekc (in)) == '\n' || cc == EOF))
 227                 break;
 228             else
 229                 pos += (long) strlen (buffer);
 230         }
 231
 232         wasdlm = strncmp (buffer, delim3, ld3) == 0;
 233         if (smsgs[msgp].s_start != pos)
 234             smsgs[msgp++].s_stop = (c == '\n' && wasdlm) ? pos - 1 : pos;
 235         if (feof (in)) {
 236 #if 0
 237             if (wasdlm) {
 238                 smsgs[msgp - 1].s_stop -= ((long) strlen (buffer) + 1);
 239                 msgp++;         /* fake "End of XXX Digest" */
 240             }
 241 #endif
 242             break;
 243         }
 244         pos += (long) strlen (buffer);
 245     }
 246
 247     fclose (in);
 248     return (msgp - 1);          /* toss "End of XXX Digest" */
 249 }
 250
 251
 252 /*
 253  * Burst out the messages in the digest into the folder
 254  */
 255
 256 static void
 257 burst (struct msgs **mpp, int msgnum, struct smsg *smsgs, int numburst,
 258         int inplace, int verbosw, char *maildir)
 259 {
 260     int i, j, mode;
 261     char *msgnam;
 262     char f1[BUFSIZ], f2[BUFSIZ], f3[BUFSIZ];
 263     FILE *in, *out;
 264     struct stat st;
 265     struct msgs *mp;
 266
 267     if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
 268         adios (msgnam, "unable to read message");
 269
 270     mode =
 271       fstat (fileno(in), &st) != NOTOK ? (int) (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_mktemp(invo_name, NULL, &out), sizeof(f2));
 350
 351         if (verbosw && i != msgnum)
 352             printf ("message %d of digest %d becomes message %d\n", j, msgnum, i);
 353
 354         chmod (f2, mode);
 355         fseek (in, smsgs[j].s_start, SEEK_SET);
 356         cpybrst (in, out, msgnam, f2,
 357                 (int) (smsgs[j].s_stop - smsgs[j].s_start));
 358         fclose (out);
 359
 360         if (i == msgnum) {
 361             strncpy (f3, m_backup (f1), sizeof(f3));
 362             if (rename (f1, f3) == NOTOK)
 363                 admonish (f3, "unable to rename %s to", f1);
 364
 365             (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
 366             ext_hook("del-hook", f3, (char *)0);
 367         }
 368         if (rename (f2, f1) == NOTOK)
 369             admonish (f1, "unable to rename %s to", f2);
 370
 371         (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
 372         ext_hook("add-hook", f3, (char *)0);
 373
 374         copy_msg_flags (mp, i, msgnum);
 375         mp->msgflags |= SEQMOD;
 376     }
 377
 378     fclose (in);
 379 }
 380
 381
 382 #define S1  0
 383 #define S2  1
 384 #define S3  2
 385
 386 /*
 387  * Copy a mesage which is being burst out of a digest.
 388  * It will remove any "dashstuffing" in the message.
 389  */
 390
 391 static void
 392 cpybrst (FILE *in, FILE *out, char *ifile, char *ofile, int len)
 393 {
 394     register int c, state;
 395
 396     for (state = S1; (c = fgetc (in)) != EOF && len > 0; len--) {
 397         if (c == 0)
 398             continue;
 399         switch (state) {
 400             case S1:
 401                 switch (c) {
 402                     case '-':
 403                         state = S3;
 404                         break;
 405
 406                     default:
 407                         state = S2;
 408                     case '\n':
 409                         fputc (c, out);
 410                         break;
 411                 }
 412                 break;
 413
 414             case S2:
 415                 switch (c) {
 416                     case '\n':
 417                         state = S1;
 418                     default:
 419                         fputc (c, out);
 420                         break;
 421                 }
 422                 break;
 423
 424             case S3:
 425                 switch (c) {
 426                     case ' ':
 427                         state = S2;
 428                         break;
 429
 430                     default:
 431                         state = (c == '\n') ? S1 : S2;
 432                         fputc ('-', out);
 433                         fputc (c, out);
 434                         break;
 435                 }
 436                 break;
 437         }
 438     }
 439
 440     if (ferror (in) && !feof (in))
 441         adios (ifile, "error reading");
 442     if (ferror (out))
 443         adios (ofile, "error writing");
 444 }