4 * Output an HTML message, modifying it slightly to make sure it plays nice
5 * with the rest of our web framework.
11 #include "webserver.h"
15 * Sanitize and enhance an HTML message for display.
16 * Also convert weird character sets to UTF-8 if necessary.
18 void output_html(char *charset) {
25 int buffer_length = 1;
27 int content_length = 0;
28 int output_length = 0;
35 iconv_t ic = (iconv_t)(-1) ;
36 char *ibuf; /* Buffer of characters to be converted */
37 char *obuf; /* Buffer for converted characters */
38 size_t ibuflen; /* Length of input buffer */
39 size_t obuflen; /* Length of output buffer */
40 char *osav; /* Saved pointer to output buffer */
44 sprintf(new_window, "<a target=\"%s\" href=", TARGET);
46 while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
47 line_length = strlen(buf);
48 buffer_length = content_length + line_length + 2;
49 msg = realloc(msg, buffer_length);
52 wprintf(_("realloc() error! couldn't get %d bytes: %s"),
55 wprintf("</b><br /><br />\n");
58 strcpy(&msg[content_length], buf);
59 content_length += line_length;
60 strcpy(&msg[content_length], "\n");
65 if ( (strcasecmp(charset, "us-ascii"))
66 && (strcasecmp(charset, "UTF-8"))
67 && (strcasecmp(charset, ""))
69 ic = iconv_open("UTF-8", charset);
70 if (ic == (iconv_t)(-1) ) {
71 lprintf(5, "%s:%d iconv_open() failed: %s\n",
72 __FILE__, __LINE__, strerror(errno));
75 if (ic != (iconv_t)(-1) ) {
77 ibuflen = content_length;
78 obuflen = content_length + (content_length / 2) ;
79 obuf = (char *) malloc(obuflen);
81 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
82 content_length = content_length + (content_length / 2) - obuflen;
83 osav[content_length] = 0;
92 msgend = &msg[content_length];
94 while (ptr < msgend) {
96 /* Advance to next tag */
97 ptr = strchr(ptr, '<');
98 if ((ptr == NULL) || (ptr >= msgend)) break;
100 if ((ptr == NULL) || (ptr >= msgend)) break;
102 /* Any of these tags cause everything up to and including
103 * the tag to be removed.
105 if ( (!strncasecmp(ptr, "HTML", 4))
106 ||(!strncasecmp(ptr, "HEAD", 4))
107 ||(!strncasecmp(ptr, "/HEAD", 5))
108 ||(!strncasecmp(ptr, "BODY", 4)) ) {
109 ptr = strchr(ptr, '>');
110 if ((ptr == NULL) || (ptr >= msgend)) break;
112 if ((ptr == NULL) || (ptr >= msgend)) break;
116 /* Any of these tags cause everything including and following
117 * the tag to be removed.
119 if ( (!strncasecmp(ptr, "/HTML", 5))
120 ||(!strncasecmp(ptr, "/BODY", 5)) ) {
130 converted_msg = malloc(content_length);
131 strcpy(converted_msg, "");
133 while (ptr < msgend) {
134 /* Change mailto: links to WebCit mail, by replacing the
135 * link with one that points back to our mail room. Due to
136 * the way we parse URL's, it'll even handle mailto: links
137 * that have "?subject=" in them.
139 if (!strncasecmp(ptr, "<A HREF=\"mailto:", 16)) {
140 content_length += 64;
141 converted_msg = realloc(converted_msg, content_length);
142 sprintf(&converted_msg[output_length],
143 "<A HREF=\"/display_enter"
144 "?force_room=_MAIL_&recp=");
149 /* Make links open in a separate window */
150 else if (!strncasecmp(ptr, "<A HREF=", 8)) {
151 content_length += 64;
152 converted_msg = realloc(converted_msg, content_length);
153 sprintf(&converted_msg[output_length], new_window);
154 output_length += strlen(new_window);
158 /* Turn anything that looks like a URL into a real link, as long
159 * as it's not inside a tag already
161 else if ( (brak == 0) && (alevel == 0)
162 && (!strncasecmp(ptr, "http://", 7))) {
164 /* Find the end of the link */
165 for (i=0; i<=strlen(ptr); ++i) {
177 if (linklen > 0) break;
180 content_length += (32 + linklen);
181 converted_msg = realloc(converted_msg, content_length);
182 sprintf(&converted_msg[output_length], new_window);
183 output_length += strlen(new_window);
184 converted_msg[output_length] = '\"';
185 converted_msg[++output_length] = 0;
186 for (i=0; i<linklen; ++i) {
187 converted_msg[output_length] = ptr[i];
188 converted_msg[++output_length] = 0;
190 sprintf(&converted_msg[output_length], "\">");
192 for (i=0; i<linklen; ++i) {
193 converted_msg[output_length] = *ptr++;
194 converted_msg[++output_length] = 0;
196 sprintf(&converted_msg[output_length], "</A>");
202 * We need to know when we're inside a tag,
203 * so we don't turn things that look like URL's into
204 * links, when they're already links - or image sources.
206 if (*ptr == '<') ++brak;
207 if (*ptr == '>') --brak;
208 if (!strncasecmp(ptr, "</A>", 3)) --alevel;
209 converted_msg[output_length] = *ptr++;
210 converted_msg[++output_length] = 0;
214 /* Output our big pile of markup */
215 client_write(converted_msg, output_length);
217 /* A little trailing vertical whitespace... */
218 wprintf("<br /><br />\n");
220 /* Now give back the memory */