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			write(htmlfd, txt, t - txt);
 99			if (c=='>')
100				html("&gt;");
101			else if (c=='<')
102				html("&lt;");
103			else if (c=='&')
104				html("&amp;");
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			write(htmlfd, txt, t - txt);
120			if (c=='>')
121				html("&gt;");
122			else if (c=='<')
123				html("&lt;");
124			else if (c=='&')
125				html("&amp;");
126			txt = t+1;
127		}
128		t++;
129	}
130	if (t!=txt)
131		write(htmlfd, 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			write(htmlfd, txt, t - txt);
143			if (c=='>')
144				html("&gt;");
145			else if (c=='<')
146				html("&lt;");
147			else if (c=='\'')
148				html("&#x27;");
149			else if (c=='"')
150				html("&quot;");
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!='&' && c!='+') {
166			write(htmlfd, txt, t - txt);
167			write(htmlfd, e, 3);
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 (e) {
183			write(htmlfd, txt, t - txt);
184			write(htmlfd, e, 3);
185			txt = t+1;
186		}
187		t++;
188	}
189	if (t!=txt)
190		html(txt);
191}
192
193void html_hidden(const char *name, const char *value)
194{
195	html("<input type='hidden' name='");
196	html_attr(name);
197	html("' value='");
198	html_attr(value);
199	html("'/>");
200}
201
202void html_option(const char *value, const char *text, const char *selected_value)
203{
204	html("<option value='");
205	html_attr(value);
206	html("'");
207	if (selected_value && !strcmp(selected_value, value))
208		html(" selected='selected'");
209	html(">");
210	html_txt(text);
211	html("</option>\n");
212}
213
214void html_link_open(const char *url, const char *title, const char *class)
215{
216	html("<a href='");
217	html_attr(url);
218	if (title) {
219		html("' title='");
220		html_attr(title);
221	}
222	if (class) {
223		html("' class='");
224		html_attr(class);
225	}
226	html("'>");
227}
228
229void html_link_close(void)
230{
231	html("</a>");
232}
233
234void html_fileperm(unsigned short mode)
235{
236	htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
237	      (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
238}
239
240int html_include(const char *filename)
241{
242	FILE *f;
243	char buf[4096];
244	size_t len;
245
246	if (!(f = fopen(filename, "r"))) {
247		fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
248			filename, strerror(errno), errno);
249		return -1;
250	}
251	while((len = fread(buf, 1, 4096, f)) > 0)
252		write(htmlfd, buf, len);
253	fclose(f);
254	return 0;
255}
256
257int hextoint(char c)
258{
259	if (c >= 'a' && c <= 'f')
260		return 10 + c - 'a';
261	else if (c >= 'A' && c <= 'F')
262		return 10 + c - 'A';
263	else if (c >= '0' && c <= '9')
264		return c - '0';
265	else
266		return -1;
267}
268
269char *convert_query_hexchar(char *txt)
270{
271	int d1, d2;
272	if (strlen(txt) < 3) {
273		*txt = '\0';
274		return txt-1;
275	}
276	d1 = hextoint(*(txt+1));
277	d2 = hextoint(*(txt+2));
278	if (d1<0 || d2<0) {
279		strcpy(txt, txt+3);
280		return txt-1;
281	} else {
282		*txt = d1 * 16 + d2;
283		strcpy(txt+1, txt+3);
284		return txt;
285	}
286}
287
288int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value))
289{
290	char *t, *txt, *value = NULL, c;
291
292	if (!txt_)
293		return 0;
294
295	t = txt = strdup(txt_);
296	if (t == NULL) {
297		printf("Out of memory\n");
298		exit(1);
299	}
300	while((c=*t) != '\0') {
301		if (c=='=') {
302			*t = '\0';
303			value = t+1;
304		} else if (c=='+') {
305			*t = ' ';
306		} else if (c=='%') {
307			t = convert_query_hexchar(t);
308		} else if (c=='&') {
309			*t = '\0';
310			(*fn)(txt, value);
311			txt = t+1;
312			value = NULL;
313		}
314		t++;
315	}
316	if (t!=txt)
317		(*fn)(txt, value);
318	return 0;
319}