html.c (view raw)
1/* html.c: helper functions for html output
2 *
3 * Copyright (C) 2006 Lars Hjemli
4 *
5 * Licensed under GNU General Public License v2
6 * (see COPYING for full license text)
7 */
8
9#include <unistd.h>
10#include <stdio.h>
11#include <stdlib.h>
12#include <stdarg.h>
13#include <string.h>
14#include <errno.h>
15
16/* Percent-encoding of each character, except: a-zA-Z0-9!$()*,./:;@- */
17static const char* url_escape_table[256] = {
18 "%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07", "%08", "%09",
19 "%0a", "%0b", "%0c", "%0d", "%0e", "%0f", "%10", "%11", "%12", "%13",
20 "%14", "%15", "%16", "%17", "%18", "%19", "%1a", "%1b", "%1c", "%1d",
21 "%1e", "%1f", "%20", 0, "%22", "%23", 0, "%25", "%26", "%27", 0, 0, 0,
22 "%2b", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%3c", "%3d",
23 "%3e", "%3f", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
24 0, 0, 0, 0, 0, 0, 0, 0, 0, "%5c", 0, "%5e", 0, "%60", 0, 0, 0, 0, 0,
25 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%7b",
26 "%7c", "%7d", 0, "%7f", "%80", "%81", "%82", "%83", "%84", "%85",
27 "%86", "%87", "%88", "%89", "%8a", "%8b", "%8c", "%8d", "%8e", "%8f",
28 "%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97", "%98", "%99",
29 "%9a", "%9b", "%9c", "%9d", "%9e", "%9f", "%a0", "%a1", "%a2", "%a3",
30 "%a4", "%a5", "%a6", "%a7", "%a8", "%a9", "%aa", "%ab", "%ac", "%ad",
31 "%ae", "%af", "%b0", "%b1", "%b2", "%b3", "%b4", "%b5", "%b6", "%b7",
32 "%b8", "%b9", "%ba", "%bb", "%bc", "%bd", "%be", "%bf", "%c0", "%c1",
33 "%c2", "%c3", "%c4", "%c5", "%c6", "%c7", "%c8", "%c9", "%ca", "%cb",
34 "%cc", "%cd", "%ce", "%cf", "%d0", "%d1", "%d2", "%d3", "%d4", "%d5",
35 "%d6", "%d7", "%d8", "%d9", "%da", "%db", "%dc", "%dd", "%de", "%df",
36 "%e0", "%e1", "%e2", "%e3", "%e4", "%e5", "%e6", "%e7", "%e8", "%e9",
37 "%ea", "%eb", "%ec", "%ed", "%ee", "%ef", "%f0", "%f1", "%f2", "%f3",
38 "%f4", "%f5", "%f6", "%f7", "%f8", "%f9", "%fa", "%fb", "%fc", "%fd",
39 "%fe", "%ff"
40};
41
42int htmlfd = STDOUT_FILENO;
43
44char *fmt(const char *format, ...)
45{
46 static char buf[8][1024];
47 static int bufidx;
48 int len;
49 va_list args;
50
51 bufidx++;
52 bufidx &= 7;
53
54 va_start(args, format);
55 len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);
56 va_end(args);
57 if (len>sizeof(buf[bufidx])) {
58 fprintf(stderr, "[html.c] string truncated: %s\n", format);
59 exit(1);
60 }
61 return buf[bufidx];
62}
63
64void html_raw(const char *data, size_t size)
65{
66 write(htmlfd, data, size);
67}
68
69void html(const char *txt)
70{
71 write(htmlfd, txt, strlen(txt));
72}
73
74void htmlf(const char *format, ...)
75{
76 static char buf[65536];
77 va_list args;
78
79 va_start(args, format);
80 vsnprintf(buf, sizeof(buf), format, args);
81 va_end(args);
82 html(buf);
83}
84
85void html_status(int code, const char *msg, int more_headers)
86{
87 htmlf("Status: %d %s\n", code, msg);
88 if (!more_headers)
89 html("\n");
90}
91
92void html_txt(const char *txt)
93{
94 const char *t = txt;
95 while(t && *t){
96 int c = *t;
97 if (c=='<' || c=='>' || c=='&') {
98 html_raw(txt, t - txt);
99 if (c=='>')
100 html(">");
101 else if (c=='<')
102 html("<");
103 else if (c=='&')
104 html("&");
105 txt = t+1;
106 }
107 t++;
108 }
109 if (t!=txt)
110 html(txt);
111}
112
113void html_ntxt(int len, const char *txt)
114{
115 const char *t = txt;
116 while(t && *t && len--){
117 int c = *t;
118 if (c=='<' || c=='>' || c=='&') {
119 html_raw(txt, t - txt);
120 if (c=='>')
121 html(">");
122 else if (c=='<')
123 html("<");
124 else if (c=='&')
125 html("&");
126 txt = t+1;
127 }
128 t++;
129 }
130 if (t!=txt)
131 html_raw(txt, t - txt);
132 if (len<0)
133 html("...");
134}
135
136void html_attr(const char *txt)
137{
138 const char *t = txt;
139 while(t && *t){
140 int c = *t;
141 if (c=='<' || c=='>' || c=='\'' || c=='\"' || c=='&') {
142 html_raw(txt, t - txt);
143 if (c=='>')
144 html(">");
145 else if (c=='<')
146 html("<");
147 else if (c=='\'')
148 html("'");
149 else if (c=='"')
150 html(""");
151 else if (c=='&')
152 html("&");
153 txt = t+1;
154 }
155 t++;
156 }
157 if (t!=txt)
158 html(txt);
159}
160
161void html_url_path(const char *txt)
162{
163 const char *t = txt;
164 while(t && *t){
165 unsigned char c = *t;
166 const char *e = url_escape_table[c];
167 if (e && c!='+' && c!='&') {
168 html_raw(txt, t - txt);
169 html(e);
170 txt = t+1;
171 }
172 t++;
173 }
174 if (t!=txt)
175 html(txt);
176}
177
178void html_url_arg(const char *txt)
179{
180 const char *t = txt;
181 while(t && *t){
182 unsigned char c = *t;
183 const char *e = url_escape_table[c];
184 if (c == ' ')
185 e = "+";
186 if (e) {
187 html_raw(txt, t - txt);
188 html(e);
189 txt = t+1;
190 }
191 t++;
192 }
193 if (t!=txt)
194 html(txt);
195}
196
197void html_hidden(const char *name, const char *value)
198{
199 html("<input type='hidden' name='");
200 html_attr(name);
201 html("' value='");
202 html_attr(value);
203 html("'/>");
204}
205
206void html_option(const char *value, const char *text, const char *selected_value)
207{
208 html("<option value='");
209 html_attr(value);
210 html("'");
211 if (selected_value && !strcmp(selected_value, value))
212 html(" selected='selected'");
213 html(">");
214 html_txt(text);
215 html("</option>\n");
216}
217
218void html_link_open(const char *url, const char *title, const char *class)
219{
220 html("<a href='");
221 html_attr(url);
222 if (title) {
223 html("' title='");
224 html_attr(title);
225 }
226 if (class) {
227 html("' class='");
228 html_attr(class);
229 }
230 html("'>");
231}
232
233void html_link_close(void)
234{
235 html("</a>");
236}
237
238void html_fileperm(unsigned short mode)
239{
240 htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
241 (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
242}
243
244int html_include(const char *filename)
245{
246 FILE *f;
247 char buf[4096];
248 size_t len;
249
250 if (!(f = fopen(filename, "r"))) {
251 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
252 filename, strerror(errno), errno);
253 return -1;
254 }
255 while((len = fread(buf, 1, 4096, f)) > 0)
256 html_raw(buf, len);
257 fclose(f);
258 return 0;
259}
260
261int hextoint(char c)
262{
263 if (c >= 'a' && c <= 'f')
264 return 10 + c - 'a';
265 else if (c >= 'A' && c <= 'F')
266 return 10 + c - 'A';
267 else if (c >= '0' && c <= '9')
268 return c - '0';
269 else
270 return -1;
271}
272
273char *convert_query_hexchar(char *txt)
274{
275 int d1, d2, n;
276 n = strlen(txt);
277 if (n < 3) {
278 *txt = '\0';
279 return txt-1;
280 }
281 d1 = hextoint(*(txt+1));
282 d2 = hextoint(*(txt+2));
283 if (d1<0 || d2<0) {
284 memmove(txt, txt+3, n-2);
285 return txt-1;
286 } else {
287 *txt = d1 * 16 + d2;
288 memmove(txt+1, txt+3, n-2);
289 return txt;
290 }
291}
292
293int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value))
294{
295 char *o, *t, *txt, *value = NULL, c;
296
297 if (!txt_)
298 return 0;
299
300 o = t = txt = strdup(txt_);
301 if (t == NULL) {
302 printf("Out of memory\n");
303 exit(1);
304 }
305 while((c=*t) != '\0') {
306 if (c=='=') {
307 *t = '\0';
308 value = t+1;
309 } else if (c=='+') {
310 *t = ' ';
311 } else if (c=='%') {
312 t = convert_query_hexchar(t);
313 } else if (c=='&') {
314 *t = '\0';
315 (*fn)(txt, value);
316 txt = t+1;
317 value = NULL;
318 }
319 t++;
320 }
321 if (t!=txt)
322 (*fn)(txt, value);
323 free(o);
324 return 0;
325}