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.
13 static struct swit switches[] = {
41 static int find_delim (int, struct smsg *);
42 static void burst (struct msgs **, int, struct smsg *, int, int, int, char *);
43 static void cpybrst (FILE *, FILE *, char *, char *, int);
46 * A macro to check to see if we have reached a message delimiter
47 * (an encapsulation boundary, EB, in RFC 934 parlance).
49 * According to RFC 934, an EB is simply a line which starts with
50 * a "-" and is NOT followed by a space. So even a single "-" on a line
51 * by itself would be an EB.
54 #define CHECKDELIM(buffer) (buffer[0] == '-' && buffer[1] != ' ')
57 main (int argc, char **argv)
59 int inplace = 0, quietsw = 0, verbosw = 0;
60 int hi, msgnum, numburst;
61 char *cp, *maildir, *folder = NULL, buf[BUFSIZ];
62 char **argp, **arguments;
63 struct msgs_array msgs = { 0, 0, NULL };
68 setlocale(LC_ALL, "");
70 invo_name = r1bindex (argv[0], '/');
72 /* read user profile/context */
75 arguments = getarguments (invo_name, argc, argv, 1);
78 while ((cp = *argp++)) {
80 switch (smatch (++cp, switches)) {
82 ambigsw (cp, switches);
85 adios (NULL, "-%s unknown\n", cp);
88 snprintf (buf, sizeof(buf), "%s [+folder] [msgs] [switches]",
90 print_help (buf, switches, 1);
93 print_version(invo_name);
118 if (*cp == '+' || *cp == '@') {
120 adios (NULL, "only one folder at a time!");
122 folder = pluspath (cp);
124 app_msgarg(&msgs, cp);
128 if (!context_find ("path"))
129 free (path ("./", TFOLDER));
131 app_msgarg(&msgs, "cur");
133 folder = getfolder (1);
134 maildir = m_maildir (folder);
136 if (chdir (maildir) == NOTOK)
137 adios (maildir, "unable to change directory to");
139 /* read folder and create message structure */
140 if (!(mp = folder_read (folder)))
141 adios (NULL, "unable to read folder %s", folder);
143 /* check for empty folder */
145 adios (NULL, "no messages in %s", folder);
147 /* parse all the message ranges/sequences and set SELECTED */
148 for (msgnum = 0; msgnum < msgs.size; msgnum++)
149 if (!m_convert (mp, msgs.msgs[msgnum]))
151 seq_setprev (mp); /* set the previous-sequence */
153 smsgs = (struct smsg *)
154 calloc ((size_t) (MAXFOLDER + 2), sizeof(*smsgs));
156 adios (NULL, "unable to allocate burst storage");
160 /* burst all the SELECTED messages */
161 for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
162 if (is_selected (mp, msgnum)) {
163 if ((numburst = find_delim (msgnum, smsgs)) >= 1) {
165 printf ("%d message%s exploded from digest %d\n",
166 numburst, numburst > 1 ? "s" : "", msgnum);
167 burst (&mp, msgnum, smsgs, numburst, inplace, verbosw, maildir);
171 admonish (NULL, "message %d not in digest format",
173 } /* this pair of braces was missing before 1999-07-15 */
175 adios (NULL, "burst() botch -- you lose big");
180 free ((char *) smsgs);
181 context_replace (pfolder, folder); /* update current folder */
184 * If -inplace is given, then the first message burst becomes
185 * the current message (which will now show a table of contents).
186 * Otherwise, the first message extracted from the first digest
187 * becomes the current message.
190 if (mp->lowsel != mp->curmsg)
191 seq_setcur (mp, mp->lowsel);
193 if (hi <= mp->hghmsg)
197 seq_save (mp); /* synchronize message sequences */
198 context_save (); /* save the context file */
199 folder_free (mp); /* free folder/message structure */
206 * Scan the message and find the beginning and
207 * end of all the messages in the digest.
211 find_delim (int msgnum, struct smsg *smsgs)
213 int wasdlm = 0, msgp;
219 if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
220 adios (msgnam, "unable to read message");
222 for (msgp = 0, pos = 0L; msgp <= MAXFOLDER;) {
224 * We're either at the beginning of the whole message, or
225 * we're just past the delimiter of the last message.
226 * Swallow lines until we get to something that's not a newline
228 while (fgets (buffer, sizeof(buffer), in) && buffer[0] == '\n')
229 pos += (long) strlen (buffer);
234 * Reset to the beginning of the last non-blank line, and save our
235 * starting position. This is where the encapsulated message
238 fseeko (in, pos, SEEK_SET);
239 smsgs[msgp].s_start = pos;
242 * Read in lines until we get to a message delimiter.
244 * Previously we checked to make sure the preceeding line and
245 * next line was a newline. That actually does not comply with
246 * RFC 934, so make sure we break on a message delimiter even
247 * if the previous character was NOT a newline.
249 for (c = 0; fgets (buffer, sizeof(buffer), in); c = buffer[0]) {
250 if ((wasdlm = CHECKDELIM(buffer)))
253 pos += (long) strlen (buffer);
257 * Only count as a new message if we got the message delimiter.
258 * Swallow a blank line if it was right before the message delimiter.
260 if (smsgs[msgp].s_start != pos && wasdlm)
261 smsgs[msgp++].s_stop = (c == '\n' && wasdlm) ? pos - 1 : pos;
266 smsgs[msgp - 1].s_stop -= ((long) strlen (buffer) + 1);
267 msgp++; /* fake "End of XXX Digest" */
272 pos += (long) strlen (buffer);
276 return (msgp - 1); /* return the number of messages burst */
281 * Burst out the messages in the digest into the folder
285 burst (struct msgs **mpp, int msgnum, struct smsg *smsgs, int numburst,
286 int inplace, int verbosw, char *maildir)
290 char f1[BUFSIZ], f2[BUFSIZ], f3[BUFSIZ];
295 if ((in = fopen (msgnam = m_name (msgnum), "r")) == NULL)
296 adios (msgnam, "unable to read message");
299 fstat (fileno(in), &st) != NOTOK ? (int) (st.st_mode & 0777) : m_gmprot();
303 * See if we have enough space in the folder
304 * structure for all the new messages.
306 if ((mp->hghmsg + numburst > mp->hghoff) &&
307 !(mp = folder_realloc (mp, mp->lowoff, mp->hghmsg + numburst)))
308 adios (NULL, "unable to allocate folder storage");
311 j = mp->hghmsg; /* old value */
312 mp->hghmsg += numburst;
313 mp->nummsg += numburst;
316 * If this is not the highest SELECTED message, then
317 * increment mp->hghsel by numburst, since the highest
318 * SELECTED is about to be slid down by that amount.
320 if (msgnum < mp->hghsel)
321 mp->hghsel += numburst;
324 * If -inplace is given, renumber the messages after the
325 * source message, to make room for each of the messages
326 * contained within the digest.
328 * This is equivalent to refiling a message from the point
329 * of view of the external hooks.
332 for (i = mp->hghmsg; j > msgnum; i--, j--) {
333 strncpy (f1, m_name (i), sizeof(f1));
334 strncpy (f2, m_name (j), sizeof(f2));
335 if (does_exist (mp, j)) {
337 printf ("message %d becomes message %d\n", j, i);
339 if (rename (f2, f1) == NOTOK)
340 admonish (f1, "unable to rename %s to", f2);
342 (void)snprintf(f1, sizeof (f1), "%s/%d", maildir, i);
343 (void)snprintf(f2, sizeof (f2), "%s/%d", maildir, j);
344 ext_hook("ref-hook", f1, f2);
346 copy_msg_flags (mp, i, j);
347 clear_msg_flags (mp, j);
348 mp->msgflags |= SEQMOD;
353 unset_selected (mp, msgnum);
355 /* new hghmsg is hghmsg + numburst
357 * At this point, there is an array of numburst smsgs, each element of
358 * which contains the starting and stopping offsets (seeks) of the message
359 * in the digest. The inplace flag is set if the original digest is replaced
360 * by a message containing the table of contents. smsgs[0] is that table of
361 * contents. Go through the message numbers in reverse order (high to low).
363 * Set f1 to the name of the destination message, f2 to the name of a scratch
364 * file. Extract a message from the digest to the scratch file. Move the
365 * original message to a backup file if the destination message number is the
366 * same as the number of the original message, which only happens if the
367 * inplace flag is set. Then move the scratch file to the destination message.
369 * Moving the original message to the backup file is equivalent to deleting the
370 * message from the point of view of the external hooks. And bursting each
371 * message is equivalent to adding a new message.
374 i = inplace ? msgnum + numburst : mp->hghmsg;
375 for (j = numburst; j >= (inplace ? 0 : 1); i--, j--) {
376 strncpy (f1, m_name (i), sizeof(f1));
377 strncpy (f2, m_mktemp(invo_name, NULL, &out), sizeof(f2));
379 if (verbosw && i != msgnum)
380 printf ("message %d of digest %d becomes message %d\n", j, msgnum, i);
383 fseeko (in, smsgs[j].s_start, SEEK_SET);
384 cpybrst (in, out, msgnam, f2,
385 (int) (smsgs[j].s_stop - smsgs[j].s_start));
389 strncpy (f3, m_backup (f1), sizeof(f3));
390 if (rename (f1, f3) == NOTOK)
391 admonish (f3, "unable to rename %s to", f1);
393 (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
394 ext_hook("del-hook", f3, (char *)0);
396 if (rename (f2, f1) == NOTOK)
397 admonish (f1, "unable to rename %s to", f2);
399 (void)snprintf(f3, sizeof (f3), "%s/%d", maildir, i);
400 ext_hook("add-hook", f3, (char *)0);
402 copy_msg_flags (mp, i, msgnum);
403 mp->msgflags |= SEQMOD;
415 * Copy a mesage which is being burst out of a digest.
416 * It will remove any "dashstuffing" in the message.
420 cpybrst (FILE *in, FILE *out, char *ifile, char *ofile, int len)
422 register int c, state;
424 for (state = S1; (c = fgetc (in)) != EOF && len > 0; len--) {
459 state = (c == '\n') ? S1 : S2;
468 if (ferror (in) && !feof (in))
469 adios (ifile, "error reading");
471 adios (ofile, "error writing");