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comparison mcabber/src/nohtml.c @ 1470:a8b924b5474c

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The OTR protocol expects (X)HTML messsages
author Mikael Berthe <mikael@lilotux.net>
date Sun, 13 Apr 2008 13:01:32 +0200
parents
children dcd5d4c75199
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1469:1f7990dd416b 1470:a8b924b5474c
1 /*
2 * nohtml.c -- (X)HTML helper functions
3 *
4 * Copyright (C) 2008 Mikael Berthe <mikael@lilotux.net>
5 * Some portions come from the jabberd project, see below.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or (at
10 * your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 *
23 * Some parts come from libjabber/str.c:
24 * Copyright (c) 1999-2002 Jabber.com, Inc. All Rights Reserved. Contact
25 * information for Jabber.com, Inc. is available at http://www.jabber.com/.
26 * Portions Copyright (c) 1998-1999 Jeremie Miller.
27 */
28
29 #include <string.h>
30 #include <glib.h>
31 #include <config.h>
32
33
34 /* html_strip(htmlbuf)
35 * Remove html entities from htmlbuf and try to convert it to plain text.
36 * The caller must g_free the string after use.
37 * Code mostly derived from strunescape(), in libjabber.
38 */
39 char *html_strip(const char *htmlbuf)
40 {
41 int i, j=0;
42 char *nohtml;
43
44 if (!htmlbuf) return(NULL);
45
46 nohtml = g_strdup(htmlbuf);
47
48 if (!strchr(htmlbuf, '&') && !strchr(htmlbuf, '<'))
49 return(nohtml);
50
51 for (i = 0; i < (int)strlen(htmlbuf); i++) {
52 if (htmlbuf[i] == '&') {
53 if (!strncmp(&htmlbuf[i],"&amp;",5)) {
54 nohtml[j] = '&';
55 i += 4;
56 } else if (!strncmp(&htmlbuf[i],"&quot;", 6)) {
57 nohtml[j] = '\"';
58 i += 5;
59 } else if (!strncmp(&htmlbuf[i],"&apos;", 6)) {
60 nohtml[j] = '\'';
61 i += 5;
62 } else if (!strncmp(&htmlbuf[i],"&lt;", 4)) {
63 nohtml[j] = '<';
64 i += 3;
65 } else if (!strncmp(&htmlbuf[i],"&gt;", 4)) {
66 nohtml[j] = '>';
67 i += 3;
68 }
69 } else if (!strncmp(&htmlbuf[i],"<br>", 4) ||
70 !strncmp(&htmlbuf[i],"<br/>", 5)) {
71 nohtml[j] = '\n';
72 i += (htmlbuf[i+3] == '/' ? 4 : 3);
73 } else if (htmlbuf[i] == '<') {
74 /* Let's strip all unknown tags */
75 j--;
76 while (htmlbuf[++i] != '>');
77 } else
78 nohtml[j] = htmlbuf[i];
79 j++;
80 }
81 nohtml[j] = '\0';
82 return nohtml;
83 }
84
85 /* html_escape(text)
86 * Add (x)html entities to the text.
87 * The caller must g_free the string after use.
88 * Code mostly derived from strescape(), in libjabber.
89 */
90 char *html_escape(const char *text)
91 {
92 int i, j;
93 int oldlen, newlen;
94 char *html;
95
96 if (!text) return(NULL);
97
98 oldlen = newlen = strlen(text);
99
100 for (i = 0; i < oldlen; i++) {
101 switch(text[i])
102 {
103 case '&':
104 newlen += 5;
105 break;
106 case '\'':
107 newlen += 6;
108 break;
109 case '\"':
110 newlen += 6;
111 break;
112 case '<':
113 newlen += 4;
114 break;
115 case '>':
116 newlen += 4;
117 break;
118 case '\n':
119 newlen += 5;
120 }
121 }
122
123 if (oldlen == newlen)
124 return g_strdup(text);
125
126 html = g_new0(char, newlen+1);
127
128 for (i = j = 0; i < oldlen; i++) {
129 switch(text[i])
130 {
131 case '&':
132 memcpy(&html[j], "&amp;", 5);
133 j += 5;
134 break;
135 case '\'':
136 memcpy(&html[j], "&apos;", 6);
137 j += 6;
138 break;
139 case '\"':
140 memcpy(&html[j], "&quot;", 6);
141 j += 6;
142 break;
143 case '<':
144 memcpy(&html[j], "&lt;", 4);
145 j += 4;
146 break;
147 case '>':
148 memcpy(&html[j], "&gt;", 4);
149 j += 4;
150 break;
151 case '\n':
152 memcpy(&html[j], "<br/>", 5);
153 j += 5;
154 break;
155 default:
156 html[j++] = text[i];
157 }
158 }
159 return html;
160 }
161
162 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */