1/* html.c: helper functions for html output
  2 *
  3 * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
  4 *
  5 * Licensed under GNU General Public License v2
  6 *   (see COPYING for full license text)
  7 */
  8
  9#include "cgit.h"
 10#include "html.h"
 11
 12/* Percent-encoding of each character, except: a-zA-Z0-9!$()*,./:;@- */
 13static const char* url_escape_table[256] = {
 14	"%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07",
 15	"%08", "%09", "%0a", "%0b", "%0c", "%0d", "%0e", "%0f",
 16	"%10", "%11", "%12", "%13", "%14", "%15", "%16", "%17",
 17	"%18", "%19", "%1a", "%1b", "%1c", "%1d", "%1e", "%1f",
 18	"%20", NULL,  "%22", "%23", NULL,  "%25", "%26", "%27",
 19	NULL,  NULL,  NULL,  "%2b", NULL,  NULL,  NULL,  NULL,
 20	NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 21	NULL,  NULL,  NULL,  NULL,  "%3c", "%3d", "%3e", "%3f",
 22	NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 23	NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 24	NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 25	NULL,  NULL,  NULL,  NULL,  "%5c", NULL,  "%5e", NULL,
 26	"%60", NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 27	NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 28	NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 29	NULL,  NULL,  NULL,  "%7b", "%7c", "%7d", NULL,  "%7f",
 30	"%80", "%81", "%82", "%83", "%84", "%85", "%86", "%87",
 31	"%88", "%89", "%8a", "%8b", "%8c", "%8d", "%8e", "%8f",
 32	"%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97",
 33	"%98", "%99", "%9a", "%9b", "%9c", "%9d", "%9e", "%9f",
 34	"%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%a7",
 35	"%a8", "%a9", "%aa", "%ab", "%ac", "%ad", "%ae", "%af",
 36	"%b0", "%b1", "%b2", "%b3", "%b4", "%b5", "%b6", "%b7",
 37	"%b8", "%b9", "%ba", "%bb", "%bc", "%bd", "%be", "%bf",
 38	"%c0", "%c1", "%c2", "%c3", "%c4", "%c5", "%c6", "%c7",
 39	"%c8", "%c9", "%ca", "%cb", "%cc", "%cd", "%ce", "%cf",
 40	"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
 41	"%d8", "%d9", "%da", "%db", "%dc", "%dd", "%de", "%df",
 42	"%e0", "%e1", "%e2", "%e3", "%e4", "%e5", "%e6", "%e7",
 43	"%e8", "%e9", "%ea", "%eb", "%ec", "%ed", "%ee", "%ef",
 44	"%f0", "%f1", "%f2", "%f3", "%f4", "%f5", "%f6", "%f7",
 45	"%f8", "%f9", "%fa", "%fb", "%fc", "%fd", "%fe", "%ff"
 46};
 47
 48char *fmt(const char *format, ...)
 49{
 50	static char buf[8][1024];
 51	static int bufidx;
 52	int len;
 53	va_list args;
 54
 55	bufidx++;
 56	bufidx &= 7;
 57
 58	va_start(args, format);
 59	len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);
 60	va_end(args);
 61	if (len > sizeof(buf[bufidx])) {
 62		fprintf(stderr, "[html.c] string truncated: %s\n", format);
 63		exit(1);
 64	}
 65	return buf[bufidx];
 66}
 67
 68char *fmtalloc(const char *format, ...)
 69{
 70	struct strbuf sb = STRBUF_INIT;
 71	va_list args;
 72
 73	va_start(args, format);
 74	strbuf_vaddf(&sb, format, args);
 75	va_end(args);
 76
 77	return strbuf_detach(&sb, NULL);
 78}
 79
 80void html_raw(const char *data, size_t size)
 81{
 82	if (write(STDOUT_FILENO, data, size) != size)
 83		die_errno("write error on html output");
 84}
 85
 86void html(const char *txt)
 87{
 88	html_raw(txt, strlen(txt));
 89}
 90
 91void htmlf(const char *format, ...)
 92{
 93	va_list args;
 94	struct strbuf buf = STRBUF_INIT;
 95
 96	va_start(args, format);
 97	strbuf_vaddf(&buf, format, args);
 98	va_end(args);
 99	html(buf.buf);
100	strbuf_release(&buf);
101}
102
103void html_txtf(const char *format, ...)
104{
105	va_list args;
106
107	va_start(args, format);
108	html_vtxtf(format, args);
109	va_end(args);
110}
111
112void html_vtxtf(const char *format, va_list ap)
113{
114	va_list cp;
115	struct strbuf buf = STRBUF_INIT;
116
117	va_copy(cp, ap);
118	strbuf_vaddf(&buf, format, cp);
119	va_end(cp);
120	html_txt(buf.buf);
121	strbuf_release(&buf);
122}
123
124void html_txt(const char *txt)
125{
126	const char *t = txt;
127	while (t && *t) {
128		int c = *t;
129		if (c == '<' || c == '>' || c == '&') {
130			html_raw(txt, t - txt);
131			if (c == '>')
132				html("&gt;");
133			else if (c == '<')
134				html("&lt;");
135			else if (c == '&')
136				html("&amp;");
137			txt = t + 1;
138		}
139		t++;
140	}
141	if (t != txt)
142		html(txt);
143}
144
145void html_ntxt(int len, const char *txt)
146{
147	const char *t = txt;
148	while (t && *t && len--) {
149		int c = *t;
150		if (c == '<' || c == '>' || c == '&') {
151			html_raw(txt, t - txt);
152			if (c == '>')
153				html("&gt;");
154			else if (c == '<')
155				html("&lt;");
156			else if (c == '&')
157				html("&amp;");
158			txt = t + 1;
159		}
160		t++;
161	}
162	if (t != txt)
163		html_raw(txt, t - txt);
164	if (len < 0)
165		html("...");
166}
167
168void html_attrf(const char *fmt, ...)
169{
170	va_list ap;
171	struct strbuf sb = STRBUF_INIT;
172
173	va_start(ap, fmt);
174	strbuf_vaddf(&sb, fmt, ap);
175	va_end(ap);
176
177	html_attr(sb.buf);
178	strbuf_release(&sb);
179}
180
181void html_attr(const char *txt)
182{
183	const char *t = txt;
184	while (t && *t) {
185		int c = *t;
186		if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&') {
187			html_raw(txt, t - txt);
188			if (c == '>')
189				html("&gt;");
190			else if (c == '<')
191				html("&lt;");
192			else if (c == '\'')
193				html("&#x27;");
194			else if (c == '"')
195				html("&quot;");
196			else if (c == '&')
197				html("&amp;");
198			txt = t + 1;
199		}
200		t++;
201	}
202	if (t != txt)
203		html(txt);
204}
205
206void html_url_path(const char *txt)
207{
208	const char *t = txt;
209	while (t && *t) {
210		unsigned char c = *t;
211		const char *e = url_escape_table[c];
212		if (e && c != '+' && c != '&') {
213			html_raw(txt, t - txt);
214			html(e);
215			txt = t + 1;
216		}
217		t++;
218	}
219	if (t != txt)
220		html(txt);
221}
222
223void html_url_arg(const char *txt)
224{
225	const char *t = txt;
226	while (t && *t) {
227		unsigned char c = *t;
228		const char *e = url_escape_table[c];
229		if (c == ' ')
230			e = "+";
231		if (e) {
232			html_raw(txt, t - txt);
233			html(e);
234			txt = t + 1;
235		}
236		t++;
237	}
238	if (t != txt)
239		html(txt);
240}
241
242void html_hidden(const char *name, const char *value)
243{
244	html("<input type='hidden' name='");
245	html_attr(name);
246	html("' value='");
247	html_attr(value);
248	html("'/>");
249}
250
251void html_option(const char *value, const char *text, const char *selected_value)
252{
253	html("<option value='");
254	html_attr(value);
255	html("'");
256	if (selected_value && !strcmp(selected_value, value))
257		html(" selected='selected'");
258	html(">");
259	html_txt(text);
260	html("</option>\n");
261}
262
263void html_intoption(int value, const char *text, int selected_value)
264{
265	htmlf("<option value='%d'%s>", value,
266	      value == selected_value ? " selected='selected'" : "");
267	html_txt(text);
268	html("</option>");
269}
270
271void html_link_open(const char *url, const char *title, const char *class)
272{
273	html("<a href='");
274	html_attr(url);
275	if (title) {
276		html("' title='");
277		html_attr(title);
278	}
279	if (class) {
280		html("' class='");
281		html_attr(class);
282	}
283	html("'>");
284}
285
286void html_link_close(void)
287{
288	html("</a>");
289}
290
291void html_fileperm(unsigned short mode)
292{
293	htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
294	      (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
295}
296
297int html_include(const char *filename)
298{
299	FILE *f;
300	char buf[4096];
301	size_t len;
302
303	if (!(f = fopen(filename, "r"))) {
304		fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
305			filename, strerror(errno), errno);
306		return -1;
307	}
308	while ((len = fread(buf, 1, 4096, f)) > 0)
309		html_raw(buf, len);
310	fclose(f);
311	return 0;
312}
313
314static int hextoint(char c)
315{
316	if (c >= 'a' && c <= 'f')
317		return 10 + c - 'a';
318	else if (c >= 'A' && c <= 'F')
319		return 10 + c - 'A';
320	else if (c >= '0' && c <= '9')
321		return c - '0';
322	else
323		return -1;
324}
325
326static char *convert_query_hexchar(char *txt)
327{
328	int d1, d2, n;
329	n = strlen(txt);
330	if (n < 3) {
331		*txt = '\0';
332		return txt-1;
333	}
334	d1 = hextoint(*(txt + 1));
335	d2 = hextoint(*(txt + 2));
336	if (d1 < 0 || d2 < 0) {
337		memmove(txt, txt + 3, n - 2);
338		return txt-1;
339	} else {
340		*txt = d1 * 16 + d2;
341		memmove(txt + 1, txt + 3, n - 2);
342		return txt;
343	}
344}
345
346int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value))
347{
348	char *o, *t, *txt, *value = NULL, c;
349
350	if (!txt_)
351		return 0;
352
353	o = t = txt = xstrdup(txt_);
354	while ((c=*t) != '\0') {
355		if (c == '=') {
356			*t = '\0';
357			value = t + 1;
358		} else if (c == '+') {
359			*t = ' ';
360		} else if (c == '%') {
361			t = convert_query_hexchar(t);
362		} else if (c == '&') {
363			*t = '\0';
364			(*fn)(txt, value);
365			txt = t + 1;
366			value = NULL;
367		}
368		t++;
369	}
370	if (t != txt)
371		(*fn)(txt, value);
372	free(o);
373	return 0;
374}