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=='\"') {
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 txt = t+1;
152 }
153 t++;
154 }
155 if (t!=txt)
156 html(txt);
157}
158
159void html_url_path(const char *txt)
160{
161 const char *t = txt;
162 while(t && *t){
163 int c = *t;
164 const char *e = url_escape_table[c];
165 if (e && c!='+' && c!='&') {
166 html_raw(txt, t - txt);
167 html(e);
168 txt = t+1;
169 }
170 t++;
171 }
172 if (t!=txt)
173 html(txt);
174}
175
176void html_url_arg(const char *txt)
177{
178 const char *t = txt;
179 while(t && *t){
180 int c = *t;
181 const char *e = url_escape_table[c];
182 if (c == ' ')
183 e = "+";
184 if (e) {
185 html_raw(txt, t - txt);
186 html(e);
187 txt = t+1;
188 }
189 t++;
190 }
191 if (t!=txt)
192 html(txt);
193}
194
195void html_hidden(const char *name, const char *value)
196{
197 html("<input type='hidden' name='");
198 html_attr(name);
199 html("' value='");
200 html_attr(value);
201 html("'/>");
202}
203
204void html_option(const char *value, const char *text, const char *selected_value)
205{
206 html("<option value='");
207 html_attr(value);
208 html("'");
209 if (selected_value && !strcmp(selected_value, value))
210 html(" selected='selected'");
211 html(">");
212 html_txt(text);
213 html("</option>\n");
214}
215
216void html_link_open(const char *url, const char *title, const char *class)
217{
218 html("<a href='");
219 html_attr(url);
220 if (title) {
221 html("' title='");
222 html_attr(title);
223 }
224 if (class) {
225 html("' class='");
226 html_attr(class);
227 }
228 html("'>");
229}
230
231void html_link_close(void)
232{
233 html("</a>");
234}
235
236void html_fileperm(unsigned short mode)
237{
238 htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
239 (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
240}
241
242int html_include(const char *filename)
243{
244 FILE *f;
245 char buf[4096];
246 size_t len;
247
248 if (!(f = fopen(filename, "r"))) {
249 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
250 filename, strerror(errno), errno);
251 return -1;
252 }
253 while((len = fread(buf, 1, 4096, f)) > 0)
254 html_raw(buf, len);
255 fclose(f);
256 return 0;
257}
258
259int hextoint(char c)
260{
261 if (c >= 'a' && c <= 'f')
262 return 10 + c - 'a';
263 else if (c >= 'A' && c <= 'F')
264 return 10 + c - 'A';
265 else if (c >= '0' && c <= '9')
266 return c - '0';
267 else
268 return -1;
269}
270
271char *convert_query_hexchar(char *txt)
272{
273 int d1, d2, n;
274 n = strlen(txt);
275 if (n < 3) {
276 *txt = '\0';
277 return txt-1;
278 }
279 d1 = hextoint(*(txt+1));
280 d2 = hextoint(*(txt+2));
281 if (d1<0 || d2<0) {
282 memmove(txt, txt+3, n-2);
283 return txt-1;
284 } else {
285 *txt = d1 * 16 + d2;
286 memmove(txt+1, txt+3, n-2);
287 return txt;
288 }
289}
290
291int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value))
292{
293 char *o, *t, *txt, *value = NULL, c;
294
295 if (!txt_)
296 return 0;
297
298 o = t = txt = strdup(txt_);
299 if (t == NULL) {
300 printf("Out of memory\n");
301 exit(1);
302 }
303 while((c=*t) != '\0') {
304 if (c=='=') {
305 *t = '\0';
306 value = t+1;
307 } else if (c=='+') {
308 *t = ' ';
309 } else if (c=='%') {
310 t = convert_query_hexchar(t);
311 } else if (c=='&') {
312 *t = '\0';
313 (*fn)(txt, value);
314 txt = t+1;
315 value = NULL;
316 }
317 t++;
318 }
319 if (t!=txt)
320 (*fn)(txt, value);
321 free(o);
322 return 0;
323}