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