2 ** mhbuild.c -- expand/translate MIME composition files
4 ** This code is Copyright (c) 2002, by the authors of nmh. See the
5 ** COPYRIGHT file in the root directory of the nmh distribution for
6 ** complete copyright information.
10 ** This code was originally part of mhn.c. I split it into
11 ** a separate program (mhbuild.c). But the code still has some of
12 ** the mhn.c code in it. This program needs additional
13 ** streamlining and removal of unneeded code.
18 #include <h/signals.h>
23 #include <h/mhparse.h>
26 #ifdef HAVE_SYS_TIME_H
27 # include <sys/time.h>
31 static struct swit switches[] = {
47 ** Directory to place tmp files. This must
48 ** be set before these routines are called.
54 static char prefix[] = "----- =_aaaaaaaaaa";
62 int make_intermediates(char *);
63 void content_error(char *, CT, char *, ...);
66 void free_content(CT);
68 void free_encoding(CT, int);
73 static int init_decoded_content(CT);
74 static char *fgetstr(char *, int, FILE *);
75 static int user_content(FILE *, char *, char *, CT *);
76 static void set_id(CT, int);
77 static int compose_content(CT);
78 static int scan_content(CT);
79 static int build_headers(CT);
80 static CT build_mime(char *);
89 static char infile[BUFSIZ];
90 static int unlink_infile = 0;
92 static char outfile[BUFSIZ];
93 static int unlink_outfile = 0;
95 static void unlink_done();
98 int output_message(CT, char *);
99 int output_message_fp(CT, FILE *, char*);
102 void set_endian(void);
105 void free_content(CT);
109 main(int argc, char **argv)
111 char *cp, buf[BUFSIZ];
112 char buffer[BUFSIZ], *compfile = NULL;
113 char **argp, **arguments;
120 setlocale(LC_ALL, "");
121 invo_name = mhbasename(argv[0]);
123 /* read user profile/context */
126 arguments = getarguments(invo_name, argc, argv, 1);
129 while ((cp = *argp++)) {
130 if (cp[0] == '-' && cp[1] == '\0') {
132 adios(NULL, "cannot specify both standard input and a file");
135 verbosw = 0; /* turn off -verbose listings */
139 switch (smatch(++cp, switches)) {
141 ambigsw(cp, switches);
142 /* sysexits.h EX_USAGE */
145 adios(NULL, "-%s unknown", cp);
148 snprintf(buf, sizeof(buf), "%s [switches] file", invo_name);
149 print_help(buf, switches, 1);
152 print_version(invo_name);
167 adios(NULL, "only one composition file allowed");
175 ** Check if we've specified an additional profile
177 if ((cp = getenv("MHBUILD"))) {
178 if ((fp = fopen(cp, "r"))) {
179 readconfig((struct node **) 0, fp, cp, 0);
182 admonish("", "unable to read $MHBUILD profile (%s)",
188 ** Read the standard profile setup
190 if ((fp = fopen(cp = etcpath("mhn.defaults"), "r"))) {
191 readconfig((struct node **) 0, fp, cp, 0);
196 ** Check for storage directory. If defined, we
197 ** will store temporary files there. Else we
198 ** store them in standard nmh directory.
200 if ((cp = context_find(nmhstorage)) && *cp)
201 tmp = concat(cp, "/", invo_name, NULL);
203 tmp = getcpy(toabsdir(invo_name));
205 /* Check if we have a file to process */
207 adios(NULL, "need to specify a %s composition file",
211 ** Process the composition file from standard input.
213 if (compfile[0] == '-' && compfile[1] == '\0') {
214 /* copy standard input to temporary file */
215 strncpy(infile, m_mktemp(invo_name, NULL, &fp),
217 while (fgets(buffer, BUFSIZ, stdin))
222 /* build the content structures for MIME message */
223 ct = build_mime(infile);
225 /* output MIME message to this temporary file */
226 strncpy(outfile, m_mktemp(invo_name, NULL, &fp_out),
230 /* output the message */
231 output_message_fp(ct, fp_out, outfile);
234 /* output the temp file to standard output */
235 if ((fp = fopen(outfile, "r")) == NULL)
236 adios(outfile, "unable to open");
237 while (fgets(buffer, BUFSIZ, fp))
238 fputs(buffer, stdout);
252 ** Process the composition file from a file.
255 /* build the content structures for MIME message */
256 ct = build_mime(compfile);
258 /* output MIME message to this temporary file */
259 strncpy(outfile, m_mktemp2(compfile, invo_name, NULL, &fp_out),
263 /* output the message */
264 output_message_fp(ct, fp_out, outfile);
267 /* Rename composition draft */
268 snprintf(buffer, sizeof(buffer), "%s.orig", compfile);
269 if (rename(compfile, buffer) == NOTOK) {
270 adios(buffer, "unable to rename draft %s to", compfile);
273 /* Rename output file to take its place */
274 if (rename(outfile, compfile) == NOTOK) {
275 advise(compfile, "unable to rename output %s to", outfile);
276 rename(buffer, compfile);
277 /* sysexits.h EX_IOERR */
291 ** Check if we need to remove stray temporary files.
296 if (unlink_outfile) {
302 ** Main routine for translating composition file
303 ** into valid MIME message. It translates the draft
304 ** into a content structure (actually a tree of content
305 ** structures). This message then can be manipulated
306 ** in various ways, including being output via
310 build_mime(char *infile)
313 char buf[BUFSIZ], name[NAMESZ];
322 /* open the composition draft */
323 if ((in = fopen(infile, "r")) == NULL)
324 adios(infile, "unable to open for reading");
327 ** Allocate space for primary (outside) content
329 if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
330 adios(NULL, "out of memory");
333 ** Allocate structure for handling decoded content
334 ** for this part. We don't really need this, but
335 ** allocate it to remain consistent.
337 init_decoded_content(ct);
340 ** Parse some of the header fields in the composition
341 ** draft into the linked list of header fields for
342 ** the new MIME message.
344 for (compnum = 1, state = FLD;;) {
345 switch (state = m_getfld(state, name, buf, sizeof(buf), in)) {
351 /* abort if draft has Mime-Version header field */
352 if (!mh_strcasecmp(name, VRSN_FIELD))
353 adios(NULL, "draft shouldn't contain %s: field", VRSN_FIELD);
356 ** abort if draft has Content-Transfer-Encoding
359 if (!mh_strcasecmp(name, ENCODING_FIELD))
360 adios(NULL, "draft shouldn't contain %s: field", ENCODING_FIELD);
362 /* ignore any Content-Type fields in the header */
363 if (!mh_strcasecmp(name, TYPE_FIELD)) {
364 while (state == FLDPLUS)
365 state = m_getfld(state, name, buf,
370 /* get copies of the buffers */
374 /* if necessary, get rest of field */
375 while (state == FLDPLUS) {
376 state = m_getfld(state, name, buf,
378 vp = add(buf, vp); /* add to prev value */
381 /* Now add the header data to the list */
382 add_header(ct, np, vp);
385 /* if this wasn't the last hdr field, then continue */
391 adios(NULL, "draft has empty body -- no directives!");
396 fseek(in, (long) (-strlen(buf)), SEEK_CUR);
401 adios(NULL, "message format error in component #%d",
405 adios(NULL, "getfld() returned %d", state);
411 ** Now add the MIME-Version header field
412 ** to the list of header fields.
414 np = getcpy(VRSN_FIELD);
415 vp = concat(" ", VRSN_VALUE, "\n", NULL);
416 add_header(ct, np, vp);
419 ** We initally assume we will find multiple contents in the
420 ** draft. So create a multipart/mixed content to hold everything.
421 ** We can remove this later, if it is not needed.
423 if (get_ctinfo("multipart/mixed", ct, 0) == NOTOK) {
424 /* sysexits.h EX_DATAERR */
427 ct->c_type = CT_MULTIPART;
428 ct->c_subtype = MULTI_MIXED;
429 ct->c_file = getcpy(infile);
431 if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
432 adios(NULL, "out of memory");
433 ct->c_ctparams = (void *) m;
437 ** read and parse the composition file
438 ** and the directives it contains.
440 while (fgetstr(buf, sizeof(buf) - 1, in)) {
444 if (user_content(in, infile, buf, &p) == DONE) {
445 admonish(NULL, "ignoring spurious #end");
451 if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
452 adios(NULL, "out of memory");
459 ** close the composition draft since
460 ** it's not needed any longer.
464 /* check if any contents were found */
466 adios(NULL, "no content directives found");
469 ** If only one content was found, then remove and
470 ** free the outer multipart content.
472 if (!m->mp_parts->mp_next) {
475 p = m->mp_parts->mp_part;
476 m->mp_parts->mp_part = NULL;
478 /* move header fields */
479 p->c_first_hf = ct->c_first_hf;
480 p->c_last_hf = ct->c_last_hf;
481 ct->c_first_hf = NULL;
482 ct->c_last_hf = NULL;
491 ** Fill out, or expand directives. Parse and execute
492 ** commands specified by profile composition strings.
496 if ((cp = strchr(prefix, 'a')) == NULL)
497 adios(NULL, "internal error(4)");
500 ** Scan the contents. Choose a transfer encoding, and
501 ** check if prefix for multipart boundary clashes with
502 ** any of the contents.
504 while (scan_content(ct) == NOTOK) {
509 adios(NULL, "giving up trying to find a unique delimiter string");
515 /* Build the rest of the header field structures */
523 ** Set up structures for placing unencoded
524 ** content when building parts.
528 init_decoded_content(CT ct)
532 if ((ce = (CE) calloc(1, sizeof(*ce))) == NULL)
533 adios(NULL, "out of memory");
536 ct->c_ceopenfnx = open7Bit; /* since unencoded */
537 ct->c_ceclosefnx = close_encoding;
538 ct->c_cesizefnx = NULL; /* since unencoded */
545 fgetstr(char *s, int n, FILE *stream)
549 for (ep = (cp = s) + n; cp < ep; ) {
552 if (!fgets(cp, n, stream))
553 return (cp != s ? s : NULL);
554 if (cp == s && *cp != '#')
557 cp += (i = strlen(cp)) - 1;
558 if (i <= 1 || *cp-- != '\n' || *cp != '\\')
569 ** Parse the composition draft for text and directives.
570 ** Do initial setup of Content structure.
574 user_content(FILE *in, char *file, char *buf, CT *ctp)
582 struct str2init *s2i;
587 if (buf[0] == '\n' || strcmp(buf, "#\n") == 0) {
592 /* allocate basic Content structure */
593 if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
594 adios(NULL, "out of memory");
597 /* allocate basic structure for handling decoded content */
598 init_decoded_content(ct);
605 ** Handle inline text. Check if line
606 ** is one of the following forms:
608 ** 1) doesn't begin with '#' (implicit directive)
609 ** 2) begins with "##" (implicit directive)
610 ** 3) begins with "#<"
612 if (buf[0] != '#' || buf[1] == '#' || buf[1] == '<') {
616 char content[BUFSIZ];
620 cp = m_mktemp2(NULL, invo_name, NULL, &out);
622 adios("mhbuild", "unable to create temporary file");
624 /* use a temp file to collect the plain text lines */
625 ce->ce_file = getcpy(cp);
628 if (buf[0] == '#' && buf[1] == '<') {
629 strncpy(content, buf + 2, sizeof(content));
636 /* the directive is implicit */
637 strncpy(content, "text/plain", sizeof(content));
639 strncpy(buffer, buf[0] != '#' ? buf : buf + 1, sizeof(buffer));
643 if (headers >= 0 && uprf(buffer, DESCR_FIELD) &&
644 buffer[i=strlen(DESCR_FIELD)] == ':') {
648 ct->c_descr = add(buffer + i + 1, ct->c_descr);
649 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
650 adios(NULL, "end-of-file after %s: field in plaintext", DESCR_FIELD);
658 adios(NULL, "#-directive after %s: field in plaintext", DESCR_FIELD);
666 if (headers >= 0 && uprf(buffer, DISPO_FIELD)
667 && buffer[i = strlen(DISPO_FIELD)] == ':') {
671 ct->c_dispo = add(buffer + i + 1, ct->c_dispo);
672 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
673 adios(NULL, "end-of-file after %s: field in plaintext", DISPO_FIELD);
681 adios(NULL, "#-directive after %s: field in plaintext", DISPO_FIELD);
689 if (headers != 1 || buffer[0] != '\n')
695 if ((cp = fgetstr(buffer, sizeof(buffer) - 1, in))
698 if (buffer[0] == '#') {
701 if (buffer[1] != '#')
703 for (cp = (bp = buffer) + 1; *cp; cp++)
711 /* parse content type */
712 if (get_ctinfo(content, ct, inlineD) == NOTOK)
713 /* sysexits.h EX_USAGE */
716 for (s2i = str2cts; s2i->si_key; s2i++)
717 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
719 if (!s2i->si_key && !uprf(ci->ci_type, "X-"))
723 ** check type specified (possibly implicitly)
725 switch (ct->c_type = s2i->si_val) {
727 if (!mh_strcasecmp(ci->ci_subtype, "rfc822")) {
728 ct->c_encoding = CE_7BIT;
733 adios(NULL, "it doesn't make sense to define an in-line %s content",
734 ct->c_type == CT_MESSAGE ? "message" :
740 if ((ct->c_ctinitfnx = s2i->si_init))
741 (*ct->c_ctinitfnx) (ct);
746 fseek(in, pos, SEEK_SET);
751 ** If we've reached this point, the next line
752 ** must be some type of explicit directive.
756 adios(NULL, "The #@ directive i.e. message/external-body "
757 "is not supported anymore.");
760 /* parse directive */
761 if (get_ctinfo(buf+1, ct, 1) == NOTOK)
762 /* sysexits.h EX_DATAERR */
765 /* check directive against the list of MIME types */
766 for (s2i = str2cts; s2i->si_key; s2i++)
767 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
771 ** Check if the directive specified a valid type.
772 ** This will happen if it was one of the following forms:
778 adios(NULL, "missing subtype in \"#%s\"", ci->ci_type);
780 switch (ct->c_type = s2i->si_val) {
782 adios(NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
786 if (!mh_strcasecmp(ci->ci_subtype, "partial") ||
787 !mh_strcasecmp(ci->ci_subtype,
789 adios(NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype);
792 admonish(NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
796 if ((ct->c_ctinitfnx = s2i->si_init))
797 (*ct->c_ctinitfnx) (ct);
801 /* Handle [file] argument */
803 /* check if specifies command to execute */
804 if (*ci->ci_magic == '|' || *ci->ci_magic == '!') {
805 for (cp = ci->ci_magic + 1; isspace(*cp); cp++)
808 adios(NULL, "empty pipe command for #%s directive", ci->ci_type);
813 /* record filename of decoded contents */
814 ce->ce_file = ci->ci_magic;
815 if (access(ce->ce_file, R_OK) == NOTOK)
816 adios("reading", "unable to access %s for", ce->ce_file);
823 ** No [file] argument, so check profile for
824 ** method to compose content.
826 snprintf(buffer, sizeof(buffer), "%s-compose-%s/%s",
827 invo_name, ci->ci_type, ci->ci_subtype);
828 if ((cp = context_find(buffer)) == NULL || *cp == '\0') {
829 snprintf(buffer, sizeof(buffer), "%s-compose-%s",
830 invo_name, ci->ci_type);
831 if ((cp = context_find(buffer)) == NULL ||
833 content_error(NULL, ct, "don't know how to compose content");
834 /* sysexits.h EX_USAGE */
838 ci->ci_magic = getcpy(cp);
844 ** #forw [+folder] [msgs]
846 if (!mh_strcasecmp(ci->ci_type, "forw")) {
848 char *folder, *arguments[MAXARGS];
854 ap = brkstring(ci->ci_magic, " ", "\n");
855 for (i=0; ap[i] && i<MAXARGS-1; i++) {
856 arguments[i] = ap[i];
861 arguments[0] = seq_cur;
866 /* search the arguments for a folder name */
867 for (ap = arguments; *ap; ap++) {
869 if (*cp == '+' || *cp == '@') {
871 adios(NULL, "only one folder per #forw directive");
873 folder = getcpy(expandfol(cp));
877 /* else, use the current folder */
879 folder = getcpy(getcurfol());
881 if (!(mp = folder_read(folder)))
882 adios(NULL, "unable to read folder %s", folder);
883 for (ap = arguments; *ap; ap++) {
885 if (*cp != '+' && *cp != '@')
886 if (!m_convert(mp, cp))
887 /* sysexits.h EX_USAGE */
894 ** If there is more than one message to include, make this
895 ** a content of type "multipart/digest" and insert each message
896 ** as a subpart. If there is only one message, then make this
897 ** a content of type "message/rfc822".
899 if (mp->numsel > 1) {
900 /* we are forwarding multiple messages */
901 if (get_ctinfo("multipart/digest", ct, 0) == NOTOK)
902 /* sysexits.h EX_DATAERR */
904 ct->c_type = CT_MULTIPART;
905 ct->c_subtype = MULTI_DIGEST;
907 if ((m = (struct multipart *)
908 calloc(1, sizeof(*m))) == NULL)
909 adios(NULL, "out of memory");
910 ct->c_ctparams = (void *) m;
913 for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
914 if (is_selected(mp, msgnum)) {
919 if ((p = (CT) calloc(1, sizeof(*p)))
921 adios(NULL, "out of memory");
922 init_decoded_content(p);
924 if (get_ctinfo("message/rfc822", p, 0)
926 /* sysexits.h EX_DATAERR */
928 p->c_type = CT_MESSAGE;
929 p->c_subtype = MESSAGE_RFC822;
931 snprintf(buffer, sizeof(buffer),
932 "%s/%d", mp->foldpath,
934 pe->ce_file = getcpy(buffer);
936 if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
937 adios(NULL, "out of memory");
944 /* we are forwarding one message */
945 if (get_ctinfo("message/rfc822", ct, 0) == NOTOK)
946 /* sysexits.h EX_DATAERR */
948 ct->c_type = CT_MESSAGE;
949 ct->c_subtype = MESSAGE_RFC822;
952 snprintf(buffer, sizeof(buffer), "%s/%d",
953 mp->foldpath, msgnum);
954 ce->ce_file = getcpy(buffer);
957 folder_free(mp); /* free folder/message structure */
964 if (!mh_strcasecmp(ci->ci_type, "end")) {
971 ** #begin [ alternative | parallel ]
973 if (!mh_strcasecmp(ci->ci_type, "begin")) {
976 cp = SubMultiPart[vrsn - 1].kv_key;
977 } else if (!mh_strcasecmp(ci->ci_magic, "alternative")) {
978 vrsn = MULTI_ALTERNATE;
979 cp = SubMultiPart[vrsn - 1].kv_key;
980 } else if (!mh_strcasecmp(ci->ci_magic, "parallel")) {
981 vrsn = MULTI_PARALLEL;
982 cp = SubMultiPart[vrsn - 1].kv_key;
983 } else if (uprf(ci->ci_magic, "digest")) {
986 vrsn = MULTI_UNKNOWN;
991 snprintf(buffer, sizeof(buffer), "multipart/%s", cp);
992 if (get_ctinfo(buffer, ct, 0) == NOTOK)
993 /* sysexits.h EX_DATAERR */
995 ct->c_type = CT_MULTIPART;
996 ct->c_subtype = vrsn;
998 if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
999 adios(NULL, "out of memory");
1000 ct->c_ctparams = (void *) m;
1003 while (fgetstr(buffer, sizeof(buffer) - 1, in)) {
1007 if (user_content(in, file, buffer, &p) == DONE) {
1009 adios(NULL, "empty \"#begin ... #end\" sequence");
1015 if ((part = (struct part *)
1016 calloc(1, sizeof(*part))) == NULL)
1017 adios(NULL, "out of memory");
1019 pp = &part->mp_next;
1022 admonish(NULL, "premature end-of-file, missing #end");
1027 ** Unknown directive
1029 adios(NULL, "unknown directive \"#%s\"", ci->ci_type);
1030 return NOTOK; /* NOT REACHED */
1035 set_id(CT ct, int top)
1039 static time_t clock = 0;
1040 static char *msgfmt;
1044 snprintf(msgid, sizeof(msgid), "<%d.%ld.%%d@%s>\n",
1045 (int) getpid(), (long) clock, LocalName());
1047 msgfmt = getcpy(msgid);
1049 snprintf(msgid, sizeof(msgid), msgfmt, top ? 0 : ++partno);
1050 ct->c_id = getcpy(msgid);
1055 ** Fill out, or expand the various contents in the composition
1056 ** draft. Read-in any necessary files. Parse and execute any
1057 ** commands specified by profile composition strings.
1061 compose_content(CT ct)
1063 CE ce = ct->c_cefile;
1065 switch (ct->c_type) {
1070 char partnam[BUFSIZ];
1071 struct multipart *m = (struct multipart *) ct->c_ctparams;
1075 snprintf(partnam, sizeof(partnam), "%s.",
1077 pp = partnam + strlen(partnam);
1082 /* first, we call compose_content on all the subparts */
1083 for (part = m->mp_parts, partnum = 1; part;
1084 part = part->mp_next, partnum++) {
1085 CT p = part->mp_part;
1087 sprintf(pp, "%d", partnum);
1088 p->c_partno = getcpy(partnam);
1089 if (compose_content(p) == NOTOK)
1096 /* Nothing to do for type message */
1100 ** Discrete types (text/application/audio/image/video)
1105 int xstdout, len, buflen;
1106 char *bp, **ap, *cp;
1107 char *vec[4], buffer[BUFSIZ];
1109 CI ci = &ct->c_ctinfo;
1112 if (!(cp = ci->ci_magic))
1113 adios(NULL, "internal error(5)");
1115 tfile = m_mktemp2(NULL, invo_name, NULL, NULL);
1116 if (tfile == NULL) {
1117 adios("mhbuild", "unable to create temporary file");
1119 ce->ce_file = getcpy(tfile);
1124 /* Get buffer ready to go */
1127 buflen = sizeof(buffer);
1130 ** Parse composition string into buffer
1132 for ( ; *cp; cp++) {
1138 ** insert parameters from
1144 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1145 snprintf(bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
1155 /* %f, and stdout is not-redirected */
1161 ** insert temporary filename
1162 ** where content should be
1165 snprintf(bp, buflen, "%s", ce->ce_file);
1169 /* insert content subtype */
1170 strncpy(bp, ci->ci_subtype, buflen);
1174 /* insert character % */
1195 printf("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer);
1197 fflush(stdout); /* not sure if need for -noverbose */
1204 if ((out = fopen(ce->ce_file, "w")) == NULL)
1205 adios(ce->ce_file, "unable to open for writing");
1207 switch (child_id = fork()) {
1209 adios("fork", "unable to fork");
1214 dup2(fileno(out), 1);
1216 execvp("/bin/sh", vec);
1217 fprintf(stderr, "unable to exec ");
1224 if (pidXwait(child_id, NULL))
1225 /* sysexits.h EX_SOFTWARE */
1238 ** Scan the content.
1240 ** 1) choose a transfer encoding.
1241 ** 2) check for clashes with multipart boundary string.
1242 ** 3) for text content, figure out which character set is being used.
1244 ** If there is a clash with one of the contents and the multipart boundary,
1245 ** this function will exit with NOTOK. This will cause the scanning process
1246 ** to be repeated with a different multipart boundary. It is possible
1247 ** (although highly unlikely) that this scan will be repeated multiple times.
1254 int check8bit = 0, contains8bit = 0;
1255 int checklinelen = 0, linelen = 0;
1256 int checkboundary = 0, boundaryclash = 0;
1257 int checklinespace = 0, linespace = 0; /* trailing whitespace */
1258 unsigned char *cp = NULL, buffer[BUFSIZ];
1259 struct text *t = NULL;
1261 CE ce = ct->c_cefile;
1264 ** handle multipart by scanning all subparts
1265 ** and then checking their encoding.
1267 if (ct->c_type == CT_MULTIPART) {
1268 struct multipart *m = (struct multipart *) ct->c_ctparams;
1271 /* initially mark the domain of enclosing multipart as 7bit */
1272 ct->c_encoding = CE_7BIT;
1274 for (part = m->mp_parts; part; part = part->mp_next) {
1275 CT p = part->mp_part;
1277 if (scan_content(p) == NOTOK) {
1278 /* choose encoding for subpart */
1283 ** if necessary, enlarge encoding for enclosing
1286 if (p->c_encoding == CE_BINARY)
1287 ct->c_encoding = CE_BINARY;
1288 if (p->c_encoding == CE_8BIT &&
1289 ct->c_encoding != CE_BINARY)
1290 ct->c_encoding = CE_8BIT;
1297 ** Decide what to check while scanning this content.
1299 switch (ct->c_type) {
1303 if (ct->c_subtype == TEXT_PLAIN) {
1319 case CT_APPLICATION:
1331 ** Scan the unencoded content
1333 if (check8bit || checklinelen || checklinespace || checkboundary) {
1334 if ((in = fopen(ce->ce_file, "r")) == NULL)
1335 adios(ce->ce_file, "unable to open for reading");
1336 len = strlen(prefix);
1338 while (fgets(buffer, sizeof(buffer) - 1, in)) {
1340 for (cp = buffer; *cp; cp++) {
1341 if (!isascii(*cp)) {
1343 /* no need to keep checking */
1349 if (checklinelen && (strlen(buffer) > CPERLIN + 1)) {
1351 checklinelen = 0; /* no need to keep checking */
1354 if (checklinespace &&
1355 (cp = buffer + strlen(buffer) - 2) >
1356 buffer && isspace(*cp)) {
1358 /* no need to keep checking */
1363 ** Check if content contains a line that clashes
1364 ** with our standard boundary for multipart messages.
1366 if (checkboundary && buffer[0] == '-' &&
1368 for (cp = buffer + strlen(buffer) - 1;
1373 if (strncmp(buffer + 2, prefix, len)==0 &&
1374 isdigit(buffer[2 + len])) {
1376 /* no need to keep checking */
1385 ** Decide which transfer encoding to use.
1387 switch (ct->c_type) {
1390 ** If the text content didn't specify a character
1391 ** set, we need to figure out which one was used.
1393 t = (struct text *) ct->c_ctparams;
1394 if (t->tx_charset == CHARSET_UNSPECIFIED) {
1395 CI ci = &ct->c_ctinfo;
1398 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++)
1402 t->tx_charset = CHARSET_UNKNOWN;
1403 *ap = concat("charset=", write_charset_8bit(),
1406 t->tx_charset = CHARSET_USASCII;
1407 *ap = getcpy("charset=us-ascii");
1410 cp = strchr(*ap++, '=');
1416 if (contains8bit || linelen || linespace)
1417 ct->c_encoding = CE_QUOTED;
1419 ct->c_encoding = CE_7BIT;
1423 ct->c_encoding = CE_7BIT;
1426 case CT_APPLICATION:
1431 ** Forcing use of base64, because these types likely
1432 ** contain binary data and NUL bytes. Don't care about
1433 ** files that would be clean.
1435 ct->c_encoding = CE_BASE64;
1439 return (boundaryclash ? NOTOK : OK);
1444 ** Scan the content structures, and build header
1445 ** fields that will need to be output into the
1450 build_headers(CT ct)
1454 char *np, *vp, buffer[BUFSIZ];
1455 CI ci = &ct->c_ctinfo;
1458 ** If message is type multipart, then add the multipart
1459 ** boundary to the list of attribute/value pairs.
1461 if (ct->c_type == CT_MULTIPART) {
1463 static int level = 0; /* store nesting level */
1467 snprintf(buffer, sizeof(buffer), "boundary=%s%d",
1469 cp = strchr(*ap++ = getcpy(buffer), '=');
1476 ** output the content type and subtype
1478 np = getcpy(TYPE_FIELD);
1479 vp = concat(" ", ci->ci_type, "/", ci->ci_subtype, NULL);
1481 /* keep track of length of line */
1482 len = strlen(TYPE_FIELD) + strlen(ci->ci_type) +
1483 strlen(ci->ci_subtype) + 3;
1486 ** Append the attribute/value pairs to
1487 ** the end of the Content-Type line.
1489 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1493 snprintf(buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep);
1494 if (len + 1 + (cc = strlen(buffer)) >= CPERLIN) {
1495 vp = add("\n\t", vp);
1501 vp = add(buffer, vp);
1506 ** Append any RFC-822 comment to the end of
1507 ** the Content-Type line.
1509 if (ci->ci_comment) {
1510 snprintf(buffer, sizeof(buffer), "(%s)", ci->ci_comment);
1511 if (len + 1 + (cc = 2 + strlen(ci->ci_comment)) >= CPERLIN) {
1512 vp = add("\n\t", vp);
1518 vp = add(buffer, vp);
1522 add_header(ct, np, vp);
1525 ** output the Content-ID
1528 np = getcpy(ID_FIELD);
1529 vp = concat(" ", ct->c_id, NULL);
1530 add_header(ct, np, vp);
1534 ** output the Content-Description
1537 np = getcpy(DESCR_FIELD);
1538 vp = concat(" ", ct->c_descr, NULL);
1539 add_header(ct, np, vp);
1543 ** output the Content-Disposition
1546 np = getcpy(DISPO_FIELD);
1547 vp = concat(" ", ct->c_dispo, NULL);
1548 add_header(ct, np, vp);
1552 ** output the Content-Transfer-Encoding
1554 switch (ct->c_encoding) {
1556 /* Nothing to output */
1560 if (ct->c_type == CT_MESSAGE)
1561 adios(NULL, "internal error, invalid encoding");
1563 np = getcpy(ENCODING_FIELD);
1564 vp = concat(" ", "8bit", "\n", NULL);
1565 add_header(ct, np, vp);
1569 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1570 adios(NULL, "internal error, invalid encoding");
1572 np = getcpy(ENCODING_FIELD);
1573 vp = concat(" ", "quoted-printable", "\n", NULL);
1574 add_header(ct, np, vp);
1578 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1579 adios(NULL, "internal error, invalid encoding");
1581 np = getcpy(ENCODING_FIELD);
1582 vp = concat(" ", "base64", "\n", NULL);
1583 add_header(ct, np, vp);
1587 if (ct->c_type == CT_MESSAGE)
1588 adios(NULL, "internal error, invalid encoding");
1590 np = getcpy(ENCODING_FIELD);
1591 vp = concat(" ", "binary", "\n", NULL);
1592 add_header(ct, np, vp);
1596 adios(NULL, "unknown transfer encoding in content");
1601 ** Additional content specific header processing
1603 switch (ct->c_type) {
1606 struct multipart *m;
1609 m = (struct multipart *) ct->c_ctparams;
1610 for (part = m->mp_parts; part; part = part->mp_next) {