webcit/html2html.c

   1 /*
   2  * $Id$
   3  */
   4 /**
   5  * \defgroup HTML2HTML Output an HTML message, modifying it slightly to make sure it plays nice
   6  * with the rest of our web framework.
   7  * \ingroup WebcitHttpServer
   8  */
   9 /*@{*/
  10 #include "webcit.h"
  11 #include "webserver.h"
  12
  13
  14 /**
  15  * \brief       Strip surrounding single or double quotes from a string.
  16  *
  17  * \param s     String to be stripped.
  18  */
  19 void stripquotes(char *s)
  20 {
  21         int len;
  22
  23         if (!s) return;
  24
  25         len = strlen(s);
  26         if (len < 2) return;
  27
  28         if ( ( (s[0] == '\"') && (s[len-1] == '\"') ) || ( (s[0] == '\'') && (s[len-1] == '\'') ) ) {
  29                 s[len-1] = 0;
  30                 strcpy(s, &s[1]);
  31         }
  32 }
  33
  34
  35 /**
  36  * \brief Check to see if a META tag has overridden the declared MIME character set.
  37  *
  38  * \param charset               Character set name (left unchanged if we don't do anything)
  39  * \param meta_http_equiv       Content of the "http-equiv" portion of the META tag
  40  * \param meta_content          Content of the "content" portion of the META tag
  41  */
  42 void extract_charset_from_meta(char *charset, char *meta_http_equiv, char *meta_content)
  43 {
  44         char *ptr;
  45         char buf[64];
  46
  47         if (!charset) return;
  48         if (!meta_http_equiv) return;
  49         if (!meta_content) return;
  50
  51
  52         if (strcasecmp(meta_http_equiv, "Content-type")) return;
  53
  54         ptr = strchr(meta_content, ';');
  55         if (!ptr) return;
  56
  57         safestrncpy(buf, ++ptr, sizeof buf);
  58         striplt(buf);
  59         if (!strncasecmp(buf, "charset=", 8)) {
  60                 strcpy(charset, &buf[8]);
  61
  62                 /*
  63                  * The brain-damaged webmail program in Microsoft Exchange declares
  64                  * a charset of "unicode" when they really mean "UTF-8".  GNU iconv
  65                  * treats "unicode" as an alias for "UTF-16" so we have to manually
  66                  * fix this here, otherwise messages generated in Exchange webmail
  67                  * show up as a big pile of weird characters.
  68                  */
  69                 if (!strcasecmp(charset, "unicode")) {
  70                         strcpy(charset, "UTF-8");
  71                 }
  72
  73         }
  74 }
  75
  76
  77
  78 /**
  79  * \brief Sanitize and enhance an HTML message for display.
  80  *        Also convert weird character sets to UTF-8 if necessary.
  81  *        Also fixup img src="cid:..." type inline images to fetch the image
  82  *
  83  * \param supplied_charset the input charset as declared in the MIME headers
  84  */
  85 void output_html(const char *supplied_charset, int treat_as_wiki, int msgnum, StrBuf *Source, StrBuf *Target) {
  86         char buf[SIZ];
  87         char *msg;
  88         char *ptr;
  89         char *msgstart;
  90         char *msgend;
  91         StrBuf *converted_msg;
  92         int buffer_length = 1;
  93         int line_length = 0;
  94         int content_length = 0;
  95         char new_window[SIZ];
  96         int brak = 0;
  97         int alevel = 0;
  98         int scriptlevel = 0;
  99         int script_start_pos = (-1);
 100         int i;
 101         int linklen;
 102         char charset[128];
 103         StrBuf *BodyArea = NULL;
 104 #ifdef HAVE_ICONV
 105         iconv_t ic = (iconv_t)(-1) ;
 106         char *ibuf;                   /**< Buffer of characters to be converted */
 107         char *obuf;                   /**< Buffer for converted characters      */
 108         size_t ibuflen;               /**< Length of input buffer               */
 109         size_t obuflen;               /**< Length of output buffer              */
 110         char *osav;                   /**< Saved pointer to output buffer       */
 111 #endif
 112         if (Target == NULL)
 113                 Target = WC->WBuf;
 114
 115         safestrncpy(charset, supplied_charset, sizeof charset);
 116         msg = strdup("");
 117         sprintf(new_window, "<a target=\"%s\" href=", TARGET);
 118
 119         if (Source == NULL) while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
 120                 line_length = strlen(buf);
 121                 buffer_length = content_length + line_length + 2;
 122                 ptr = realloc(msg, buffer_length);
 123                 if (ptr == NULL) {
 124                         StrBufAppendPrintf(Target, "<b>");
 125                         StrBufAppendPrintf(Target, _("realloc() error! couldn't get %d bytes: %s"),
 126                                         buffer_length + 1,
 127                                         strerror(errno));
 128                         StrBufAppendPrintf(Target, "</b><br /><br />\n");
 129                         while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
 130                                 /** flush */
 131                         }
 132                         free(msg);
 133                         return;
 134                 }
 135                 msg = ptr;
 136                 strcpy(&msg[content_length], buf);
 137                 content_length += line_length;
 138                 strcpy(&msg[content_length], "\n");
 139                 content_length += 1;
 140         }
 141         else {
 142                 content_length = StrLength(Source);
 143                 free(msg);
 144                 msg = (char*) ChrPtr(Source);/* TODO: remove cast */
 145                 buffer_length = content_length;
 146         }
 147
 148         /** Do a first pass to isolate the message body */
 149         ptr = msg + 1;
 150         msgstart = msg;
 151         msgend = &msg[content_length];
 152
 153         while (ptr < msgend) {
 154
 155                 /** Advance to next tag */
 156                 ptr = strchr(ptr, '<');
 157                 if ((ptr == NULL) || (ptr >= msgend)) break;
 158                 ++ptr;
 159                 if ((ptr == NULL) || (ptr >= msgend)) break;
 160
 161                 /**
 162                  *  Look for META tags.  Some messages (particularly in
 163                  *  Asian locales) illegally declare a message's character
 164                  *  set in the HTML instead of in the MIME headers.  This
 165                  *  is wrong but we have to work around it anyway.
 166                  */
 167                 if (!strncasecmp(ptr, "META", 4)) {
 168
 169                         char *meta_start;
 170                         char *meta_end;
 171                         int meta_length;
 172                         char *meta;
 173                         char *meta_http_equiv;
 174                         char *meta_content;
 175                         char *spaceptr;
 176
 177                         meta_start = &ptr[4];
 178                         meta_end = strchr(ptr, '>');
 179                         if ((meta_end != NULL) && (meta_end <= msgend)) {
 180                                 meta_length = meta_end - meta_start + 1;
 181                                 meta = malloc(meta_length + 1);
 182                                 safestrncpy(meta, meta_start, meta_length);
 183                                 meta[meta_length] = 0;
 184                                 striplt(meta);
 185                                 if (!strncasecmp(meta, "HTTP-EQUIV=", 11)) {
 186                                         meta_http_equiv = strdup(&meta[11]);
 187                                         spaceptr = strchr(meta_http_equiv, ' ');
 188                                         if (spaceptr != NULL) {
 189                                                 *spaceptr = 0;
 190                                                 meta_content = strdup(++spaceptr);
 191                                                 if (!strncasecmp(meta_content, "content=", 8)) {
 192                                                         strcpy(meta_content, &meta_content[8]);
 193                                                         stripquotes(meta_http_equiv);
 194                                                         stripquotes(meta_content);
 195                                                         extract_charset_from_meta(charset,
 196                                                                         meta_http_equiv, meta_content);
 197                                                 }
 198                                                 free(meta_content);
 199                                         }
 200                                         free(meta_http_equiv);
 201                                 }
 202                                 free(meta);
 203                         }
 204                 }
 205
 206                 /**
 207                  * Any of these tags cause everything up to and including
 208                  * the tag to be removed.
 209                  */
 210                 if ( (!strncasecmp(ptr, "HTML", 4))
 211                                 ||(!strncasecmp(ptr, "HEAD", 4))
 212                                 ||(!strncasecmp(ptr, "/HEAD", 5))
 213                                 ||(!strncasecmp(ptr, "BODY", 4)) ) {
 214                         char *pBody = NULL;
 215
 216                         if (!strncasecmp(ptr, "BODY", 4)) {
 217                                 pBody = ptr;
 218                         }
 219                         ptr = strchr(ptr, '>');
 220                         if ((ptr == NULL) || (ptr >= msgend)) break;
 221                         if ((pBody != NULL) && (ptr - pBody > 4)) {
 222                                 char* src;
 223                                 char *cid_start, *cid_end;
 224
 225                                 *ptr = '\0';
 226                                 pBody += 4;
 227                                 while ((isspace(*pBody)) && (pBody < ptr))
 228                                         pBody ++;
 229                                 BodyArea = NewStrBufPlain(NULL,  ptr - pBody);
 230
 231                                 if (pBody < ptr) {
 232                                         src = strstr(pBody, "cid:");
 233                                         if (src) {
 234                                                 cid_start = src + 4;
 235                                                 cid_end = cid_start;
 236                                                 while ((*cid_end != '"') &&
 237                                                                 !isspace(*cid_end) &&
 238                                                                 (cid_end < ptr))
 239                                                         cid_end ++;
 240
 241                                                 /* copy tag and attributes up to src="cid: */
 242                                                 StrBufAppendBufPlain(BodyArea, pBody, src - pBody, 0);
 243
 244                                                 /* add in /webcit/mimepart/<msgno>/CID/
 245                                                    trailing / stops dumb URL filters getting excited */
 246                                                 StrBufAppendPrintf(BodyArea,
 247                                                                 "/webcit/mimepart/%d/",msgnum);
 248                                                 StrBufAppendBufPlain(BodyArea, cid_start, cid_end - cid_start, 0);
 249
 250                                                 if (ptr - cid_end > 0)
 251                                                         StrBufAppendBufPlain(BodyArea,
 252                                                                         cid_end + 1,
 253                                                                         ptr - cid_end, 0);
 254                                         }
 255                                         else
 256                                                 StrBufAppendBufPlain(BodyArea, pBody, ptr - pBody, 0);
 257                                 }
 258                                 *ptr = '>';
 259                         }
 260                         ++ptr;
 261                         if ((ptr == NULL) || (ptr >= msgend)) break;
 262                         msgstart = ptr;
 263                 }
 264
 265                 /**
 266                  * Any of these tags cause everything including and following
 267                  * the tag to be removed.
 268                  */
 269                 if ( (!strncasecmp(ptr, "/HTML", 5))
 270                                 ||(!strncasecmp(ptr, "/BODY", 5)) ) {
 271                         --ptr;
 272                         msgend = ptr;
 273                         strcpy(ptr, "");
 274
 275                 }
 276
 277                 ++ptr;
 278         }
 279         if (msgstart > msg) {
 280                 strcpy(msg, msgstart);
 281         }
 282
 283         /** Now go through the message, parsing tags as necessary. */
 284         converted_msg = NewStrBufPlain(NULL, content_length + 8192);
 285
 286
 287         /** Convert foreign character sets to UTF-8 if necessary. */
 288 #ifdef HAVE_ICONV
 289         if ( (strcasecmp(charset, "us-ascii"))
 290                         && (strcasecmp(charset, "UTF-8"))
 291                         && (strcasecmp(charset, ""))
 292            ) {
 293                 lprintf(9, "Converting %s to UTF-8\n", charset);
 294                 ctdl_iconv_open("UTF-8", charset, &ic);
 295                 if (ic == (iconv_t)(-1) ) {
 296                         lprintf(5, "%s:%d iconv_open() failed: %s\n",
 297                                         __FILE__, __LINE__, strerror(errno));
 298                 }
 299         }
 300         if  (Source == NULL) {
 301                 if (ic != (iconv_t)(-1) ) {
 302                         ibuf = msg;
 303                         ibuflen = content_length;
 304                         obuflen = content_length + (content_length / 2) ;
 305                         obuf = (char *) malloc(obuflen);
 306                         osav = obuf;
 307                         iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
 308                         content_length = content_length + (content_length / 2) - obuflen;
 309                         osav[content_length] = 0;
 310                         free(msg);
 311                         msg = osav;
 312                         iconv_close(ic);
 313                 }
 314         }
 315         else {
 316                 if (ic != (iconv_t)(-1) ) {
 317                         StrBuf *Buf = NewStrBufPlain(NULL, StrLength(Source) + 8096);;
 318                         StrBufConvert(Source, Buf, &ic);
 319                         FreeStrBuf(&Buf);
 320                         iconv_close(ic);
 321                         msg = (char*)ChrPtr(Source); /* TODO: get rid of this. */
 322                 }
 323         }
 324
 325 #endif
 326
 327         /**
 328          *      At this point, the message has been stripped down to
 329          *      only the content inside the <BODY></BODY> tags, and has
 330          *      been converted to UTF-8 if it was originally in a foreign
 331          *      character set.  The text is also guaranteed to be null
 332          *      terminated now.
 333          */
 334
 335         if (converted_msg == NULL) {
 336                 StrBufAppendPrintf(Target, "Error %d: %s<br />%s:%d", errno, strerror(errno), __FILE__, __LINE__);
 337                 goto BAIL;
 338         }
 339
 340         if (BodyArea != NULL) {
 341                 StrBufAppendBufPlain(converted_msg, HKEY("<table "), 0);
 342                 StrBufAppendBuf(converted_msg, BodyArea, 0);
 343                 StrBufAppendBufPlain(converted_msg, HKEY(" width=\"100%\"><tr><td>"), 0);
 344         }
 345         ptr = msg;
 346         msgend = strchr(msg, 0);
 347         while (ptr < msgend) {
 348
 349                 /** Try to sanitize the html of any rogue scripts */
 350                 if (!strncasecmp(ptr, "<script", 7)) {
 351                         if (scriptlevel == 0) {
 352                                 script_start_pos = StrLength(converted_msg);
 353                         }
 354                         ++scriptlevel;
 355                 }
 356                 if (!strncasecmp(ptr, "</script", 8)) {
 357                         --scriptlevel;
 358                 }
 359
 360                 /**
 361                  * Change mailto: links to WebCit mail, by replacing the
 362                  * link with one that points back to our mail room.  Due to
 363                  * the way we parse URL's, it'll even handle mailto: links
 364                  * that have "?subject=" in them.
 365                  */
 366                 if (!strncasecmp(ptr, "<a href=\"mailto:", 16)) {
 367                         content_length += 64;
 368                         StrBufAppendPrintf(converted_msg,
 369                                         "<a href=\"display_enter?force_room=_MAIL_&recp=");
 370                         ptr = &ptr[16];
 371                         ++alevel;
 372                         ++brak;
 373                 }
 374                 /** Make external links open in a separate window */
 375                 else if (!strncasecmp(ptr, "<a href=\"", 9)) {
 376                         ++alevel;
 377                         ++brak;
 378                         if ( ((strchr(ptr, ':') < strchr(ptr, '/')))
 379                                         &&  ((strchr(ptr, '/') < strchr(ptr, '>')))
 380                            ) {
 381                                 /* open external links to new window */
 382                                 StrBufAppendPrintf(converted_msg, new_window);
 383                                 ptr = &ptr[8];
 384                         }
 385                         else if ( (treat_as_wiki) && (strncasecmp(ptr, "<a href=\"wiki?", 14)) ) {
 386                                 content_length += 64;
 387                                 StrBufAppendPrintf(converted_msg, "<a href=\"wiki?page=");
 388                                 ptr = &ptr[9];
 389                         }
 390                         else {
 391                                 StrBufAppendPrintf(converted_msg, "<a href=\"");
 392                                 ptr = &ptr[9];
 393                         }
 394                 }
 395                 /** Fixup <img src="cid:... ...> to fetch the mime part */
 396                 else if (!strncasecmp(ptr, "<img ", 5)) {
 397                         char* tag_end=strchr(ptr,'>');
 398                         char* src=strstr(ptr, " src=\"cid:");
 399                         char *cid_start, *cid_end;
 400                         ++brak;
 401
 402                         if (src &&
 403                                         (cid_start=strchr(src,':')) &&
 404                                         (cid_end=strchr(cid_start,'"')) &&
 405                                         (cid_end < tag_end)) {
 406
 407                                 /* copy tag and attributes up to src="cid: */
 408                                 StrBufAppendBufPlain(converted_msg, ptr, src - ptr, 0);
 409                                 cid_start++;
 410
 411                                 /* add in /webcit/mimepart/<msgno>/CID/
 412                                    trailing / stops dumb URL filters getting excited */
 413                                 StrBufAppendPrintf(converted_msg,
 414                                                 " src=\"/webcit/mimepart/%d/",msgnum);
 415                                 StrBufAppendBufPlain(converted_msg, cid_start, cid_end - cid_start, 0);
 416                                 StrBufAppendBufPlain(converted_msg, "/\"", -1, 0);
 417
 418                                 ptr = cid_end+1;
 419                         }
 420                         StrBufAppendBufPlain(converted_msg, ptr, tag_end - ptr, 0);
 421                         ptr = tag_end;
 422                 }
 423
 424                 /**
 425                  * Turn anything that looks like a URL into a real link, as long
 426                  * as it's not inside a tag already
 427                  */
 428                 else if ( (brak == 0) && (alevel == 0)
 429                      && (!strncasecmp(ptr, "http://", 7))) {
 430                                 /** Find the end of the link */
 431                                 int strlenptr;
 432                                 linklen = 0;
 433
 434                                 strlenptr = strlen(ptr);
 435                                 for (i=0; i<=strlenptr; ++i) {
 436                                         if ((ptr[i]==0)
 437                                            ||(isspace(ptr[i]))
 438                                            ||(ptr[i]==10)
 439                                            ||(ptr[i]==13)
 440                                            ||(ptr[i]=='(')
 441                                            ||(ptr[i]==')')
 442                                            ||(ptr[i]=='<')
 443                                            ||(ptr[i]=='>')
 444                                            ||(ptr[i]=='[')
 445                                            ||(ptr[i]==']')
 446                                            ||(ptr[i]=='"')
 447                                            ||(ptr[i]=='\'')
 448                                         ) linklen = i;
 449                                         /* did s.b. send us an entity? */
 450                                         if (ptr[i] == '&') {
 451                                                 if ((ptr[i+2] ==';') ||
 452                                                     (ptr[i+3] ==';') ||
 453                                                     (ptr[i+5] ==';') ||
 454                                                     (ptr[i+6] ==';') ||
 455                                                     (ptr[i+7] ==';'))
 456                                                         linklen = i;
 457                                         }
 458                                         if (linklen > 0) break;
 459                                 }
 460                                 if (linklen > 0) {
 461                                         char *ltreviewptr;
 462                                         char *nbspreviewptr;
 463                                         char linkedchar;
 464                                         int len;
 465
 466                                         len = linklen;
 467                                         linkedchar = ptr[len];
 468                                         ptr[len] = '\0';
 469                                         /* spot for some subject strings tinymce tends to give us. */
 470                                         ltreviewptr = strchr(ptr, '<');
 471                                         if (ltreviewptr != NULL) {
 472                                                 *ltreviewptr = '\0';
 473                                                 linklen = ltreviewptr - ptr;
 474                                         }
 475
 476                                         nbspreviewptr = strstr(ptr, "&nbsp;");
 477                                         if (nbspreviewptr != NULL) {
 478                                                 /* nbspreviewptr = '\0'; */
 479                                                 linklen = nbspreviewptr - ptr;
 480                                         }
 481                                         if (ltreviewptr != 0)
 482                                                 *ltreviewptr = '<';
 483
 484                                         ptr[len] = linkedchar;
 485
 486                                         content_length += (32 + linklen);
 487                                         StrBufAppendPrintf(converted_msg, "%s\"", new_window);
 488                                         StrBufAppendBufPlain(converted_msg, ptr, linklen, 0);
 489                                         StrBufAppendPrintf(converted_msg, "\">");
 490                                         StrBufAppendBufPlain(converted_msg, ptr, linklen, 0);
 491                                         ptr += linklen;
 492                                         StrBufAppendPrintf(converted_msg, "</A>");
 493                                 }
 494                 }
 495                 else {
 496                         StrBufAppendBufPlain(converted_msg, ptr, 1, 0);
 497                         ptr++;
 498                 }
 499
 500                 /**
 501                  * We need to know when we're inside a tag,
 502                  * so we don't turn things that look like URL's into
 503                  * links, when they're already links - or image sources.
 504                  */
 505                 if (*(ptr-1) == '<') {
 506                         ++brak;
 507                 }
 508                 if (*(ptr-1) == '>') {
 509                         --brak;
 510                         if ((scriptlevel == 0) && (script_start_pos >= 0)) {
 511                                 StrBufCutRight(converted_msg, StrLength(converted_msg) - script_start_pos);
 512                                 script_start_pos = (-1);
 513                         }
 514                 }
 515                 if (!strncasecmp(ptr, "</A>", 3)) --alevel;
 516         }
 517         if (BodyArea != NULL) {
 518                 StrBufAppendBufPlain(converted_msg, HKEY("</td></tr></table>"), 0);
 519                 FreeStrBuf(&BodyArea);
 520         }
 521
 522         /**     uncomment these two lines to override conversion        */
 523         /**     memcpy(converted_msg, msg, content_length);             */
 524         /**     output_length = content_length;                         */
 525
 526         /** Output our big pile of markup */
 527         StrBufAppendBuf(Target, converted_msg, 0);
 528
 529 BAIL:   /** A little trailing vertical whitespace... */
 530         StrBufAppendPrintf(Target, "<br /><br />\n");
 531
 532         /** Now give back the memory */
 533         FreeStrBuf(&converted_msg);
 534         if ((msg != NULL) && (Source == NULL)) free(msg);
 535 }
 536
 537
 538
 539
 540
 541
 542 /*
 543  * Look for URL's embedded in a buffer and make them linkable.  We use a
 544  * target window in order to keep the Citadel session in its own window.
 545  */
 546 void UrlizeText(StrBuf* Target, StrBuf *Source, StrBuf *WrkBuf)
 547 {
 548         int len, UrlLen, Offset, TrailerLen;
 549         const char *start, *end, *pos;
 550
 551         FlushStrBuf(Target);
 552
 553         start = NULL;
 554         len = StrLength(Source);
 555         end = ChrPtr(Source) + len;
 556         for (pos = ChrPtr(Source); (pos < end) && (start == NULL); ++pos) {
 557                 if (!strncasecmp(pos, "http://", 7))
 558                         start = pos;
 559                 else if (!strncasecmp(pos, "ftp://", 6))
 560                         start = pos;
 561         }
 562
 563         if (start == NULL) {
 564                 StrBufAppendBuf(Target, Source, 0);
 565                 return;
 566         }
 567         FlushStrBuf(WrkBuf);
 568
 569         for (pos = ChrPtr(Source) + len; pos > start; --pos) {
 570                 if (  (!isprint(*pos))
 571                    || (isspace(*pos))
 572                    || (*pos == '{')
 573                    || (*pos == '}')
 574                    || (*pos == '|')
 575                    || (*pos == '\\')
 576                    || (*pos == '^')
 577                    || (*pos == '[')
 578                    || (*pos == ']')
 579                    || (*pos == '`')
 580                    || (*pos == '<')
 581                    || (*pos == '>')
 582                    || (*pos == '(')
 583                    || (*pos == ')')
 584                 ) {
 585                         end = pos;
 586                 }
 587         }
 588
 589         UrlLen = end - start;
 590         StrBufAppendBufPlain(WrkBuf, start, UrlLen, 0);
 591
 592         Offset = start - ChrPtr(Source);
 593         if (Offset != 0)
 594                 StrBufAppendBufPlain(Target, ChrPtr(Source), Offset, 0);
 595         StrBufAppendPrintf(Target, "%ca href=%c%s%c TARGET=%c%s%c%c%s%c/A%c",
 596                            LB, QU, ChrPtr(WrkBuf), QU, QU, TARGET,
 597                            QU, RB, ChrPtr(WrkBuf), LB, RB);
 598
 599         TrailerLen = StrLength(Source) - (end - ChrPtr(Source));
 600         if (TrailerLen > 0)
 601                 StrBufAppendBufPlain(Target, end, TrailerLen, 0);
 602 }
 603 void url(char *buf, size_t bufsize)
 604 {
 605         int len, UrlLen, Offset, TrailerLen, outpos;
 606         char *start, *end, *pos;
 607         char urlbuf[SIZ];
 608         char outbuf[SIZ];
 609
 610         start = NULL;
 611         len = strlen(buf);
 612         if (len > bufsize) {
 613                 lprintf(1, "URL: content longer than buffer!");
 614                 return;
 615         }
 616         end = buf + len;
 617         for (pos = buf; (pos < end) && (start == NULL); ++pos) {
 618                 if (!strncasecmp(pos, "http://", 7))
 619                         start = pos;
 620                 if (!strncasecmp(pos, "ftp://", 6))
 621                         start = pos;
 622         }
 623
 624         if (start == NULL)
 625                 return;
 626
 627         for (pos = buf+len; pos > start; --pos) {
 628                 if (  (!isprint(*pos))
 629                    || (isspace(*pos))
 630                    || (*pos == '{')
 631                    || (*pos == '}')
 632                    || (*pos == '|')
 633                    || (*pos == '\\')
 634                    || (*pos == '^')
 635                    || (*pos == '[')
 636                    || (*pos == ']')
 637                    || (*pos == '`')
 638                    || (*pos == '<')
 639                    || (*pos == '>')
 640                    || (*pos == '(')
 641                    || (*pos == ')')
 642                 ) {
 643                         end = pos;
 644                 }
 645         }
 646
 647         UrlLen = end - start;
 648         if (UrlLen > sizeof(urlbuf)){
 649                 lprintf(1, "URL: content longer than buffer!");
 650                 return;
 651         }
 652         memcpy(urlbuf, start, UrlLen);
 653         urlbuf[UrlLen] = '\0';
 654
 655         Offset = start - buf;
 656         if ((Offset != 0) && (Offset < sizeof(outbuf)))
 657                 memcpy(outbuf, buf, Offset);
 658         outpos = snprintf(&outbuf[Offset], sizeof(outbuf) - Offset,
 659                           "%ca href=%c%s%c TARGET=%c%s%c%c%s%c/A%c",
 660                           LB, QU, urlbuf, QU, QU, TARGET, QU, RB, urlbuf, LB, RB);
 661         if (outpos >= sizeof(outbuf) - Offset) {
 662                 lprintf(1, "URL: content longer than buffer!");
 663                 return;
 664         }
 665
 666         TrailerLen = len - (end - start);
 667         if (TrailerLen > 0)
 668                 memcpy(outbuf + Offset + outpos, end, TrailerLen);
 669         if (Offset + outpos + TrailerLen > bufsize) {
 670                 lprintf(1, "URL: content longer than buffer!");
 671                 return;
 672         }
 673         memcpy (buf, outbuf, Offset + outpos + TrailerLen);
 674         *(buf + Offset + outpos + TrailerLen) = '\0';
 675 }
 676
 677
 678
 679
 680 /*@}*/