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     done (0);
 193     return 1;
 194 }
 195
 196
 197 /*
 198  * Scan the message and find the beginning and
 199  * end of all the messages in the digest.
 200  */
 201
 202 static int
 203 find_delim (int msgnum, struct smsg *smsgs)
 204 {
 205     int ld3, wasdlm, msgp;
 206     long pos;
 207     char c, *msgnam;
 208     int cc;
 209     char buffer[BUFSIZ];
 210     FILE *in;
 211
 212     ld3 = strlen (delim3);
 213
 214     if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
 215         adios (msgnam, "unable to read message");
 216
 217     for (msgp = 0, pos = 0L; msgp <= MAXFOLDER;) {
 218         while (fgets (buffer, sizeof(buffer), in) && buffer[0] == '\n')
 219             pos += (long) strlen (buffer);
 220         if (feof (in))
 221             break;
 222         fseek (in, pos, SEEK_SET);
 223         smsgs[msgp].s_start = pos;
 224
 225         for (c = 0; fgets (buffer, sizeof(buffer), in); c = buffer[0]) {
 226             if (strncmp (buffer, delim3, ld3) == 0
 227                     && (msgp == 1 || c == '\n')
 228                     && ((cc = peekc (in)) == '\n' || cc == EOF))
 229                 break;
 230             else
 231                 pos += (long) strlen (buffer);
 232         }
 233
 234         wasdlm = strncmp (buffer, delim3, ld3) == 0;
 235         if (smsgs[msgp].s_start != pos)
 236             smsgs[msgp++].s_stop = (c == '\n' && wasdlm) ? pos - 1 : pos;
 237         if (feof (in)) {
 238 #if 0
 239             if (wasdlm) {
 240                 smsgs[msgp - 1].s_stop -= ((long) strlen (buffer) + 1);
 241                 msgp++;         /* fake "End of XXX Digest" */
 242             }
 243 #endif
 244             break;
 245         }
 246         pos += (long) strlen (buffer);
 247     }
 248
 249     fclose (in);
 250     return (msgp - 1);          /* toss "End of XXX Digest" */
 251 }
 252
 253
 254 /*
 255  * Burst out the messages in the digest into the folder
 256  */
 257
 258 static void
 259 burst (struct msgs **mpp, int msgnum, struct smsg *smsgs, int numburst,
 260         int inplace, int verbosw, char *maildir)
 261 {
 262     int i, j, mode;
 263     char *msgnam;
 264     char f1[BUFSIZ], f2[BUFSIZ], f3[BUFSIZ];
 265     FILE *in, *out;
 266     struct stat st;
 267     struct msgs *mp;
 268
 269     if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
 270         adios (msgnam, "unable to read message");
 271
 272     mode = fstat (fileno(in), &st) != NOTOK ? (st.st_mode & 0777) : m_gmprot();
 273     mp = *mpp;
 274
 275     /*
 276      * See if we have enough space in the folder
 277      * structure for all the new messages.
 278      */
 279     if ((mp->hghmsg + numburst > mp->hghoff) &&
 280         !(mp = folder_realloc (mp, mp->lowoff, mp->hghmsg + numburst)))
 281         adios (NULL, "unable to allocate folder storage");
 282     *mpp = mp;
 283
 284     j = mp->hghmsg;             /* old value */
 285     mp->hghmsg += numburst;
 286     mp->nummsg += numburst;
 287
 288     /*
 289      * If this is not the highest SELECTED message, then
 290      * increment mp->hghsel by numburst, since the highest
 291      * SELECTED is about to be slid down by that amount.
 292      */
 293     if (msgnum < mp->hghsel)
 294         mp->hghsel += numburst;
 295
 296     /*
 297      * If -inplace is given, renumber the messages after the
 298      * source message, to make room for each of the messages
 299      * contained within the digest.
 300      *
 301      * This is equivalent to refiling a message from the point
 302      * of view of the external hooks.
 303      */
 304     if (inplace) {
 305         for (i = mp->hghmsg; j > msgnum; i--, j--) {
 306             strncpy (f1, m_name (i), sizeof(f1));
 307             strncpy (f2, m_name (j), sizeof(f2));
 308             if (does_exist (mp, j)) {
 309                 if (verbosw)
 310                     printf ("message %d becomes message %d\n", j, i);
 311
 312                 if (rename (f2, f1) == NOTOK)
 313                     admonish (f1, "unable to rename %s to", f2);
 314
 315                 (void)snprintf(f1, sizeof (f1), "%s/%d", maildir, i);
 316                 (void)snprintf(f2, sizeof (f2), "%s/%d", maildir, j);
 317                 ext_hook("ref-hook", f1, f2);
 318
 319                 copy_msg_flags (mp, i, j);
 320                 clear_msg_flags (mp, j);
 321                 mp->msgflags |= SEQMOD;
 322             }
 323         }
 324     }
 325
 326     unset_selected (mp, msgnum);
 327
 328     /* new hghmsg is hghmsg + numburst
 329      *
 330      * At this point, there is an array of numburst smsgs, each element of
 331      * which contains the starting and stopping offsets (seeks) of the message
 332      * in the digest.  The inplace flag is set if the original digest is replaced
 333      * by a message containing the table of contents.  smsgs[0] is that table of
 334      * contents.  Go through the message numbers in reverse order (high to low).
 335      *
 336      * Set f1 to the name of the destination message, f2 to the name of a scratch
 337      * file.  Extract a message from the digest to the scratch file.  Move the
 338      * original message to a backup file if the destination message number is the
 339      * same as the number of the original message, which only happens if the
 340      * inplace flag is set.  Then move the scratch file to the destination message.
 341      *
 342      * Moving the original message to the backup file is equivalent to deleting the
 343      * message from the point of view of the external hooks.  And bursting each
 344      * message is equivalent to adding a new message.
 345      */
 346
 347     i = inplace ? msgnum + numburst : mp->hghmsg;
 348     for (j = numburst; j >= (inplace ? 0 : 1); i--, j--) {
 349         strncpy (f1, m_name (i), sizeof(f1));
 350         strncpy (f2, m_scratch ("", invo_name), sizeof(f2));
 351         if (verbosw && i != msgnum)
 352             printf ("message %d of digest %d becomes message %d\n", j, msgnum, i);
 353
 354         if ((out = fopen (f2, "w")) == NULL)
 355             adios (f2, "unable to write message");
 356         chmod (f2, mode);
 357         fseek (in, smsgs[j].s_start, SEEK_SET);
 358         cpybrst (in, out, msgnam, f2,
 359                 (int) (smsgs[j].s_stop - smsgs[j].s_start));
 360         fclose (out);
 361
 362         if (i == msgnum) {
 363             strncpy (f3, m_backup (f1), sizeof(f3));
 364             if (rename (f1, f3) == NOTOK)
 365                 admonish (f3, "unable to rename %s to", f1);
 366
 367             (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
 368             ext_hook("del-hook", f3, (char *)0);
 369         }
 370         if (rename (f2, f1) == NOTOK)
 371             admonish (f1, "unable to rename %s to", f2);
 372
 373         (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
 374         ext_hook("add-hook", f3, (char *)0);
 375
 376         copy_msg_flags (mp, i, msgnum);
 377         mp->msgflags |= SEQMOD;
 378     }
 379
 380     fclose (in);
 381 }
 382
 383
 384 #define S1  0
 385 #define S2  1
 386 #define S3  2
 387
 388 /*
 389  * Copy a mesage which is being burst out of a digest.
 390  * It will remove any "dashstuffing" in the message.
 391  */
 392
 393 static void
 394 cpybrst (FILE *in, FILE *out, char *ifile, char *ofile, int len)
 395 {
 396     register int c, state;
 397
 398     for (state = S1; (c = fgetc (in)) != EOF && len > 0; len--) {
 399         if (c == 0)
 400             continue;
 401         switch (state) {
 402             case S1:
 403                 switch (c) {
 404                     case '-':
 405                         state = S3;
 406                         break;
 407
 408                     default:
 409                         state = S2;
 410                     case '\n':
 411                         fputc (c, out);
 412                         break;
 413                 }
 414                 break;
 415
 416             case S2:
 417                 switch (c) {
 418                     case '\n':
 419                         state = S1;
 420                     default:
 421                         fputc (c, out);
 422                         break;
 423                 }
 424                 break;
 425
 426             case S3:
 427                 switch (c) {
 428                     case ' ':
 429                         state = S2;
 430                         break;
 431
 432                     default:
 433                         state = (c == '\n') ? S1 : S2;
 434                         fputc ('-', out);
 435                         fputc (c, out);
 436                         break;
 437                 }
 438                 break;
 439         }
 440     }
 441
 442     if (ferror (in) && !feof (in))
 443         adios (ifile, "error reading");
 444     if (ferror (out))
 445         adios (ofile, "error writing");
 446 }