3 * burst.c -- explode digests into individual messages
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.
12 static struct swit switches[] = {
40 static int find_delim (int, struct smsg *);
41 static void burst (struct msgs **, int, struct smsg *, int, int, int, char *);
42 static void cpybrst (FILE *, FILE *, char *, char *, int);
45 * A macro to check to see if we have reached a message delimiter
46 * (an encapsulation boundary, EB, in RFC 934 parlance).
48 * According to RFC 934, an EB is simply a line which starts with
49 * a "-" and is NOT followed by a space. So even a single "-" on a line
50 * by itself would be an EB.
53 #define CHECKDELIM(buffer) (buffer[0] == '-' && buffer[1] != ' ')
56 main (int argc, char **argv)
58 int inplace = 0, quietsw = 0, verbosw = 0;
59 int msgp = 0, hi, msgnum, numburst;
60 char *cp, *maildir, *folder = NULL, buf[BUFSIZ];
61 char **argp, **arguments, *msgs[MAXARGS];
66 setlocale(LC_ALL, "");
68 invo_name = r1bindex (argv[0], '/');
70 /* read user profile/context */
73 arguments = getarguments (invo_name, argc, argv, 1);
76 while ((cp = *argp++)) {
78 switch (smatch (++cp, switches)) {
80 ambigsw (cp, switches);
83 adios (NULL, "-%s unknown\n", cp);
86 snprintf (buf, sizeof(buf), "%s [+folder] [msgs] [switches]",
88 print_help (buf, switches, 1);
91 print_version(invo_name);
116 if (*cp == '+' || *cp == '@') {
118 adios (NULL, "only one folder at a time!");
120 folder = pluspath (cp);
126 if (!context_find ("path"))
127 free (path ("./", TFOLDER));
129 msgs[msgp++] = "cur";
131 folder = getfolder (1);
132 maildir = m_maildir (folder);
134 if (chdir (maildir) == NOTOK)
135 adios (maildir, "unable to change directory to");
137 /* read folder and create message structure */
138 if (!(mp = folder_read (folder)))
139 adios (NULL, "unable to read folder %s", folder);
141 /* check for empty folder */
143 adios (NULL, "no messages in %s", folder);
145 /* parse all the message ranges/sequences and set SELECTED */
146 for (msgnum = 0; msgnum < msgp; msgnum++)
147 if (!m_convert (mp, msgs[msgnum]))
149 seq_setprev (mp); /* set the previous-sequence */
151 smsgs = (struct smsg *)
152 calloc ((size_t) (MAXFOLDER + 2), sizeof(*smsgs));
154 adios (NULL, "unable to allocate burst storage");
158 /* burst all the SELECTED messages */
159 for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
160 if (is_selected (mp, msgnum)) {
161 if ((numburst = find_delim (msgnum, smsgs)) >= 1) {
163 printf ("%d message%s exploded from digest %d\n",
164 numburst, numburst > 1 ? "s" : "", msgnum);
165 burst (&mp, msgnum, smsgs, numburst, inplace, verbosw, maildir);
169 admonish (NULL, "message %d not in digest format",
171 } /* this pair of braces was missing before 1999-07-15 */
173 adios (NULL, "burst() botch -- you lose big");
178 free ((char *) smsgs);
179 context_replace (pfolder, folder); /* update current folder */
182 * If -inplace is given, then the first message burst becomes
183 * the current message (which will now show a table of contents).
184 * Otherwise, the first message extracted from the first digest
185 * becomes the current message.
188 if (mp->lowsel != mp->curmsg)
189 seq_setcur (mp, mp->lowsel);
191 if (hi <= mp->hghmsg)
195 seq_save (mp); /* synchronize message sequences */
196 context_save (); /* save the context file */
197 folder_free (mp); /* free folder/message structure */
204 * Scan the message and find the beginning and
205 * end of all the messages in the digest.
209 find_delim (int msgnum, struct smsg *smsgs)
211 int wasdlm = 0, msgp;
217 if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
218 adios (msgnam, "unable to read message");
220 for (msgp = 0, pos = 0L; msgp <= MAXFOLDER;) {
222 * We're either at the beginning of the whole message, or
223 * we're just past the delimiter of the last message.
224 * Swallow lines until we get to something that's not a newline
226 while (fgets (buffer, sizeof(buffer), in) && buffer[0] == '\n')
227 pos += (long) strlen (buffer);
232 * Reset to the beginning of the last non-blank line, and save our
233 * starting position. This is where the encapsulated message
236 fseeko (in, pos, SEEK_SET);
237 smsgs[msgp].s_start = pos;
240 * Read in lines until we get to a message delimiter.
242 * Previously we checked to make sure the preceeding line and
243 * next line was a newline. That actually does not comply with
244 * RFC 934, so make sure we break on a message delimiter even
245 * if the previous character was NOT a newline.
247 for (c = 0; fgets (buffer, sizeof(buffer), in); c = buffer[0]) {
248 if ((wasdlm = CHECKDELIM(buffer)))
251 pos += (long) strlen (buffer);
255 * Only count as a new message if we got the message delimiter.
256 * Swallow a blank line if it was right before the message delimiter.
258 if (smsgs[msgp].s_start != pos && wasdlm)
259 smsgs[msgp++].s_stop = (c == '\n' && wasdlm) ? pos - 1 : pos;
264 smsgs[msgp - 1].s_stop -= ((long) strlen (buffer) + 1);
265 msgp++; /* fake "End of XXX Digest" */
270 pos += (long) strlen (buffer);
274 return (msgp - 1); /* return the number of messages burst */
279 * Burst out the messages in the digest into the folder
283 burst (struct msgs **mpp, int msgnum, struct smsg *smsgs, int numburst,
284 int inplace, int verbosw, char *maildir)
288 char f1[BUFSIZ], f2[BUFSIZ], f3[BUFSIZ];
293 if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
294 adios (msgnam, "unable to read message");
297 fstat (fileno(in), &st) != NOTOK ? (int) (st.st_mode & 0777) : m_gmprot();
301 * See if we have enough space in the folder
302 * structure for all the new messages.
304 if ((mp->hghmsg + numburst > mp->hghoff) &&
305 !(mp = folder_realloc (mp, mp->lowoff, mp->hghmsg + numburst)))
306 adios (NULL, "unable to allocate folder storage");
309 j = mp->hghmsg; /* old value */
310 mp->hghmsg += numburst;
311 mp->nummsg += numburst;
314 * If this is not the highest SELECTED message, then
315 * increment mp->hghsel by numburst, since the highest
316 * SELECTED is about to be slid down by that amount.
318 if (msgnum < mp->hghsel)
319 mp->hghsel += numburst;
322 * If -inplace is given, renumber the messages after the
323 * source message, to make room for each of the messages
324 * contained within the digest.
326 * This is equivalent to refiling a message from the point
327 * of view of the external hooks.
330 for (i = mp->hghmsg; j > msgnum; i--, j--) {
331 strncpy (f1, m_name (i), sizeof(f1));
332 strncpy (f2, m_name (j), sizeof(f2));
333 if (does_exist (mp, j)) {
335 printf ("message %d becomes message %d\n", j, i);
337 if (rename (f2, f1) == NOTOK)
338 admonish (f1, "unable to rename %s to", f2);
340 (void)snprintf(f1, sizeof (f1), "%s/%d", maildir, i);
341 (void)snprintf(f2, sizeof (f2), "%s/%d", maildir, j);
342 ext_hook("ref-hook", f1, f2);
344 copy_msg_flags (mp, i, j);
345 clear_msg_flags (mp, j);
346 mp->msgflags |= SEQMOD;
351 unset_selected (mp, msgnum);
353 /* new hghmsg is hghmsg + numburst
355 * At this point, there is an array of numburst smsgs, each element of
356 * which contains the starting and stopping offsets (seeks) of the message
357 * in the digest. The inplace flag is set if the original digest is replaced
358 * by a message containing the table of contents. smsgs[0] is that table of
359 * contents. Go through the message numbers in reverse order (high to low).
361 * Set f1 to the name of the destination message, f2 to the name of a scratch
362 * file. Extract a message from the digest to the scratch file. Move the
363 * original message to a backup file if the destination message number is the
364 * same as the number of the original message, which only happens if the
365 * inplace flag is set. Then move the scratch file to the destination message.
367 * Moving the original message to the backup file is equivalent to deleting the
368 * message from the point of view of the external hooks. And bursting each
369 * message is equivalent to adding a new message.
372 i = inplace ? msgnum + numburst : mp->hghmsg;
373 for (j = numburst; j >= (inplace ? 0 : 1); i--, j--) {
374 strncpy (f1, m_name (i), sizeof(f1));
375 strncpy (f2, m_mktemp(invo_name, NULL, &out), sizeof(f2));
377 if (verbosw && i != msgnum)
378 printf ("message %d of digest %d becomes message %d\n", j, msgnum, i);
381 fseeko (in, smsgs[j].s_start, SEEK_SET);
382 cpybrst (in, out, msgnam, f2,
383 (int) (smsgs[j].s_stop - smsgs[j].s_start));
387 strncpy (f3, m_backup (f1), sizeof(f3));
388 if (rename (f1, f3) == NOTOK)
389 admonish (f3, "unable to rename %s to", f1);
391 (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
392 ext_hook("del-hook", f3, (char *)0);
394 if (rename (f2, f1) == NOTOK)
395 admonish (f1, "unable to rename %s to", f2);
397 (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
398 ext_hook("add-hook", f3, (char *)0);
400 copy_msg_flags (mp, i, msgnum);
401 mp->msgflags |= SEQMOD;
413 * Copy a mesage which is being burst out of a digest.
414 * It will remove any "dashstuffing" in the message.
418 cpybrst (FILE *in, FILE *out, char *ifile, char *ofile, int len)
420 register int c, state;
422 for (state = S1; (c = fgetc (in)) != EOF && len > 0; len--) {
457 state = (c == '\n') ? S1 : S2;
466 if (ferror (in) && !feof (in))
467 adios (ifile, "error reading");
469 adios (ofile, "error writing");