--- /dev/null
+/*
+ * $Id: html.c 6014 2008-02-04 18:38:35Z ajc $
+ *
+ * Functions which handle translation between HTML and plain text
+ * Copyright (c) 2000-2005 by Art Cancro and others. This program is
+ * released under the terms of the GNU General Public License.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <ctype.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <limits.h>
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+
+#include "libcitadel.h"
+
+
+/*
+ * Convert HTML to plain text.
+ *
+ * inputmsg = pointer to raw HTML message
+ * screenwidth = desired output screenwidth
+ * do_citaformat = set to 1 to indent newlines with spaces
+ */
+char *html_to_ascii(char *inputmsg, int msglen, int screenwidth, int do_citaformat) {
+ char inbuf[SIZ];
+ int inbuf_len = 0;
+ char outbuf[SIZ];
+ char tag[1024];
+ int done_reading = 0;
+ char *inptr;
+ char *outptr;
+ size_t outptr_buffer_size;
+ size_t output_len = 0;
+ int i, j, ch, did_out, rb, scanch;
+ int nest = 0; /* Bracket nesting level */
+ int blockquote = 0; /* BLOCKQUOTE nesting level */
+ int styletag = 0; /* STYLE tag nesting level */
+ int styletag_start = 0;
+ int bytes_processed = 0;
+ char nl[128];
+
+ strcpy(nl, "\n");
+ inptr = inputmsg;
+ strcpy(inbuf, "");
+ strcpy(outbuf, "");
+ if (msglen == 0) msglen = strlen(inputmsg);
+
+ outptr_buffer_size = strlen(inptr) + SIZ;
+ outptr = malloc(outptr_buffer_size);
+ if (outptr == NULL) return NULL;
+ strcpy(outptr, "");
+ output_len = 0;
+
+ do {
+ /* Fill the input buffer */
+ inbuf_len = strlen(inbuf);
+ if ( (done_reading == 0) && (inbuf_len < (SIZ-128)) ) {
+
+ ch = *inptr++;
+ if (ch != 0) {
+ inbuf[inbuf_len++] = ch;
+ inbuf[inbuf_len] = 0;
+ }
+ else {
+ done_reading = 1;
+ }
+
+ ++bytes_processed;
+ if (bytes_processed > msglen) {
+ done_reading = 1;
+ }
+
+ }
+
+ /* Do some parsing */
+ if (!IsEmptyStr(inbuf)) {
+
+
+ /* Fold in all the spacing */
+ for (i=0; !IsEmptyStr(&inbuf[i]); ++i) {
+ if (inbuf[i]==10) inbuf[i]=32;
+ if (inbuf[i]==13) inbuf[i]=32;
+ if (inbuf[i]==9) inbuf[i]=32;
+ /*** we like foreign characters now.
+ if ((inbuf[i]<32) || (inbuf[i]>126)) {
+ inbuf[i] = '?';
+ } */
+ }
+ for (i=0; !IsEmptyStr(&inbuf[i]); ++i) {
+ while ((inbuf[i]==32)&&(inbuf[i+1]==32))
+ strcpy(&inbuf[i], &inbuf[i+1]);
+ }
+
+ for (i=0; !IsEmptyStr(&inbuf[i]); ++i) {
+
+ ch = inbuf[i];
+
+ if (ch == '<') {
+ ++nest;
+ strcpy(tag, "");
+ }
+
+ else if (ch == '>') { /* We have a tag. */
+ if (nest > 0) --nest;
+
+ /* Unqualify the tag (truncate at first space) */
+ if (strchr(tag, ' ') != NULL) {
+ strcpy(strchr(tag, ' '), "");
+ }
+
+ if (!strcasecmp(tag, "P")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, nl);
+ }
+
+ if (!strcasecmp(tag, "/DIV")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, nl);
+ }
+
+ if (!strcasecmp(tag, "LI")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, " * ");
+ }
+
+ else if (!strcasecmp(tag, "/UL")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "H1")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "H2")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "H3")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "H4")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "/H1")) {
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "/H2")) {
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "/H3")) {
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "/H4")) {
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "HR")) {
+ strcat(outbuf, nl);
+ strcat(outbuf, " ");
+ for (j=0; j<screenwidth-2; ++j)
+ strcat(outbuf, "-");
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "BR")) {
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "TR")) {
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "/TABLE")) {
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "BLOCKQUOTE")) {
+ ++blockquote;
+ strcpy(nl, "\n");
+ for (j=0; j<blockquote; ++j) strcat(nl, ">");
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "/BLOCKQUOTE")) {
+ strcat(outbuf, "\n");
+ --blockquote;
+ strcpy(nl, "\n");
+ for (j=0; j<blockquote; ++j) strcat(nl, ">");
+ strcat(outbuf, nl);
+ }
+
+ else if (!strcasecmp(tag, "STYLE")) {
+ ++styletag;
+ if (styletag == 1) {
+ styletag_start = strlen(outbuf);
+ }
+ }
+
+ else if (!strcasecmp(tag, "/STYLE")) {
+ --styletag;
+ if (styletag == 0) {
+ outbuf[styletag_start] = 0;
+ }
+ }
+
+ }
+
+ else if ((nest > 0) && (strlen(tag)<(sizeof(tag)-1))) {
+ tag[strlen(tag)+1] = 0;
+ tag[strlen(tag)] = ch;
+ }
+
+ else if (!nest) {
+ outbuf[strlen(outbuf)+1] = 0;
+ outbuf[strlen(outbuf)] = ch;
+ }
+ }
+ strcpy(inbuf, &inbuf[i]);
+ }
+
+ /* Convert &; tags to the forbidden characters */
+ if (!IsEmptyStr(outbuf)) for (i=0; !IsEmptyStr(&outbuf[i]); ++i) {
+
+ /* Character entity references */
+ if (!strncasecmp(&outbuf[i], " ", 6)) {
+ outbuf[i] = ' ';
+ strcpy(&outbuf[i+1], &outbuf[i+6]);
+ }
+
+ if (!strncasecmp(&outbuf[i], " ", 6)) {
+ outbuf[i] = ' ';
+ strcpy(&outbuf[i+1], &outbuf[i+6]);
+ }
+
+ if (!strncasecmp(&outbuf[i], " ", 6)) {
+ outbuf[i] = ' ';
+ strcpy(&outbuf[i+1], &outbuf[i+6]);
+ }
+
+ if (!strncasecmp(&outbuf[i], " ", 8)) {
+ outbuf[i] = ' ';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "<", 4)) {
+ outbuf[i] = '<';
+ strcpy(&outbuf[i+1], &outbuf[i+4]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], ">", 4)) {
+ outbuf[i] = '>';
+ strcpy(&outbuf[i+1], &outbuf[i+4]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "&", 5)) {
+ strcpy(&outbuf[i+1], &outbuf[i+5]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], """, 6)) {
+ outbuf[i] = '\"';
+ strcpy(&outbuf[i+1], &outbuf[i+6]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "‘", 7)) {
+ outbuf[i] = '`';
+ strcpy(&outbuf[i+1], &outbuf[i+7]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "’", 7)) {
+ outbuf[i] = '\'';
+ strcpy(&outbuf[i+1], &outbuf[i+7]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "©", 6)) {
+ outbuf[i] = '(';
+ outbuf[i+1] = 'c';
+ outbuf[i+2] = ')';
+ strcpy(&outbuf[i+3], &outbuf[i+6]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "•", 6)) {
+ outbuf[i] = ' ';
+ outbuf[i+1] = '*';
+ outbuf[i+2] = ' ';
+ strcpy(&outbuf[i+3], &outbuf[i+6]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "…", 8)) {
+ outbuf[i] = '.';
+ outbuf[i+1] = '.';
+ outbuf[i+2] = '.';
+ strcpy(&outbuf[i+3], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "™", 7)) {
+ outbuf[i] = '(';
+ outbuf[i+1] = 't';
+ outbuf[i+2] = 'm';
+ outbuf[i+3] = ')';
+ strcpy(&outbuf[i+4], &outbuf[i+7]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "®", 5)) {
+ outbuf[i] = '(';
+ outbuf[i+1] = 'r';
+ outbuf[i+2] = ')';
+ strcpy(&outbuf[i+3], &outbuf[i+5]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "¼", 8)) {
+ outbuf[i] = '1';
+ outbuf[i+1] = '/';
+ outbuf[i+2] = '4';
+ strcpy(&outbuf[i+3], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "½", 8)) {
+ outbuf[i] = '1';
+ outbuf[i+1] = '/';
+ outbuf[i+2] = '2';
+ strcpy(&outbuf[i+3], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "¾", 8)) {
+ outbuf[i] = '3';
+ outbuf[i+1] = '/';
+ outbuf[i+2] = '4';
+ strcpy(&outbuf[i+3], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "–", 7)) {
+ outbuf[i] = '-';
+ outbuf[i+1] = '-';
+ strcpy(&outbuf[i+2], &outbuf[i+7]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "—", 7)) {
+ outbuf[i] = '-';
+ outbuf[i+1] = '-';
+ outbuf[i+2] = '-';
+ strcpy(&outbuf[i+3], &outbuf[i+7]);
+ }
+
+ else if (!strncmp(&outbuf[i], "Ç", 8)) {
+ outbuf[i] = 'C';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "ç", 8)) {
+ outbuf[i] = 'c';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncmp(&outbuf[i], "È", 8)) {
+ outbuf[i] = 'E';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "è", 8)) {
+ outbuf[i] = 'e';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncmp(&outbuf[i], "Ê", 7)) {
+ outbuf[i] = 'E';
+ strcpy(&outbuf[i+1], &outbuf[i+7]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "ê", 7)) {
+ outbuf[i] = 'e';
+ strcpy(&outbuf[i+1], &outbuf[i+7]);
+ }
+
+ else if (!strncmp(&outbuf[i], "É", 8)) {
+ outbuf[i] = 'E';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "é", 8)) {
+ outbuf[i] = 'e';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncmp(&outbuf[i], "À", 8)) {
+ outbuf[i] = 'A';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "à", 8)) {
+ outbuf[i] = 'a';
+ strcpy(&outbuf[i+1], &outbuf[i+8]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "“", 7)) {
+ outbuf[i] = '\"';
+ strcpy(&outbuf[i+1], &outbuf[i+7]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "”", 7)) {
+ outbuf[i] = '\"';
+ strcpy(&outbuf[i+1], &outbuf[i+7]);
+ }
+
+ else if (!strncasecmp(&outbuf[i], "´", 7)) {
+ outbuf[i] = '\'';
+ strcpy(&outbuf[i+1], &outbuf[i+7]);
+ }
+
+ /* two-digit decimal equivalents */
+ else if ((!strncmp(&outbuf[i], "&#", 2))
+ && (outbuf[i+4] == ';') ) {
+ scanch = 0;
+ sscanf(&outbuf[i+2], "%02d", &scanch);
+ outbuf[i] = scanch;
+ strcpy(&outbuf[i+1], &outbuf[i+5]);
+ }
+
+ /* three-digit decimal equivalents */
+ else if ((!strncmp(&outbuf[i], "&#", 2))
+ && (outbuf[i+5] == ';') ) {
+ scanch = 0;
+ sscanf(&outbuf[i+2], "%03d", &scanch);
+ outbuf[i] = scanch;
+ strcpy(&outbuf[i+1], &outbuf[i+6]);
+ }
+
+ }
+
+ /* Make sure the output buffer is big enough */
+ if ((output_len + strlen(outbuf) + SIZ) > outptr_buffer_size) {
+ outptr_buffer_size += SIZ;
+ outptr = realloc(outptr, outptr_buffer_size);
+ if (outptr == NULL) {
+ abort();
+ }
+ }
+
+ /* Output any lines terminated with hard line breaks */
+ do {
+ did_out = 0;
+ if (strlen(outbuf) > 0) {
+ for (i = 0; i<strlen(outbuf); ++i) {
+ if ( (i<(screenwidth-2)) && (outbuf[i]=='\n')) {
+
+ strncpy(&outptr[output_len], outbuf, i+1);
+ output_len += (i+1);
+
+ if (do_citaformat) {
+ strcpy(&outptr[output_len], " ");
+ ++output_len;
+ }
+
+ strcpy(outbuf, &outbuf[i+1]);
+ i = 0;
+ did_out = 1;
+ }
+ }
+ }
+ } while (did_out);
+
+ /* Add soft line breaks */
+ if (strlen(outbuf) > (screenwidth - 2 )) {
+ rb = (-1);
+ for (i=0; i<(screenwidth-2); ++i) {
+ if (outbuf[i]==32) rb = i;
+ }
+ if (rb>=0) {
+ strncpy(&outptr[output_len], outbuf, rb);
+ output_len += rb;
+ strcpy(&outptr[output_len], nl);
+ output_len += strlen(nl);
+ if (do_citaformat) {
+ strcpy(&outptr[output_len], " ");
+ ++output_len;
+ }
+ strcpy(outbuf, &outbuf[rb+1]);
+ } else {
+ strncpy(&outptr[output_len], outbuf,
+ screenwidth-2);
+ output_len += (screenwidth-2);
+ strcpy(&outptr[output_len], nl);
+ output_len += strlen(nl);
+ if (do_citaformat) {
+ strcpy(&outptr[output_len], " ");
+ ++output_len;
+ }
+ strcpy(outbuf, &outbuf[screenwidth-2]);
+ }
+ }
+
+ } while (done_reading == 0);
+
+ strcpy(&outptr[output_len], outbuf);
+ output_len += strlen(outbuf);
+
+ /* Strip leading/trailing whitespace. We can't do this with
+ * striplt() because it uses too many strlen()'s
+ */
+ while ((output_len > 0) && (isspace(outptr[0]))) {
+ strcpy(outptr, &outptr[1]);
+ --output_len;
+ }
+ while ((output_len > 0) && (isspace(outptr[output_len-1]))) {
+ outptr[output_len-1] = 0;
+ --output_len;
+ }
+
+ if (outptr[output_len-1] != '\n') {
+ strcat(outptr, "\n");
+ ++output_len;
+ }
+
+ return outptr;
+
+}
projects / citadel.git / blobdiff