/* html.c: helper functions for html output * * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com> * * Licensed under GNU General Public License v2 *   (see COPYING for full license text) */ #include "cgit.h"#include "html.h"#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <stdarg.h>#include <string.h>#include <errno.h> /* Percent-encoding of each character, except: a-zA-Z0-9!$()*,./:;@- */static const char* url_escape_table[256] = {	"%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07", "%08", "%09",	"%0a", "%0b", "%0c", "%0d", "%0e", "%0f", "%10", "%11", "%12", "%13",	"%14", "%15", "%16", "%17", "%18", "%19", "%1a", "%1b", "%1c", "%1d",	"%1e", "%1f", "%20", 0, "%22", "%23", 0, "%25", "%26", "%27", 0, 0, 0,	"%2b", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%3c", "%3d",	"%3e", "%3f", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,	0, 0, 0, 0, 0, 0, 0, 0, 0, "%5c", 0, "%5e", 0, "%60", 0, 0, 0, 0, 0,	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%7b",	"%7c", "%7d", 0, "%7f", "%80", "%81", "%82", "%83", "%84", "%85",	"%86", "%87", "%88", "%89", "%8a", "%8b", "%8c", "%8d", "%8e", "%8f",	"%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97", "%98", "%99",	"%9a", "%9b", "%9c", "%9d", "%9e", "%9f", "%a0", "%a1", "%a2", "%a3",	"%a4", "%a5", "%a6", "%a7", "%a8", "%a9", "%aa", "%ab", "%ac", "%ad",	"%ae", "%af", "%b0", "%b1", "%b2", "%b3", "%b4", "%b5", "%b6", "%b7",	"%b8", "%b9", "%ba", "%bb", "%bc", "%bd", "%be", "%bf", "%c0", "%c1",	"%c2", "%c3", "%c4", "%c5", "%c6", "%c7", "%c8", "%c9", "%ca", "%cb",	"%cc", "%cd", "%ce", "%cf", "%d0", "%d1", "%d2", "%d3", "%d4", "%d5",	"%d6", "%d7", "%d8", "%d9", "%da", "%db", "%dc", "%dd", "%de", "%df",	"%e0", "%e1", "%e2", "%e3", "%e4", "%e5", "%e6", "%e7", "%e8", "%e9",	"%ea", "%eb", "%ec", "%ed", "%ee", "%ef", "%f0", "%f1", "%f2", "%f3",	"%f4", "%f5", "%f6", "%f7", "%f8", "%f9", "%fa", "%fb", "%fc", "%fd",	"%fe", "%ff"}; char *fmt(const char *format, ...){	static char buf[8][1024];	static int bufidx;	int len;	va_list args; 	bufidx++;	bufidx &= 7; 	va_start(args, format);	len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);	va_end(args);	if (len > sizeof(buf[bufidx])) {		fprintf(stderr, "[html.c] string truncated: %s\n", format);		exit(1);	}	return buf[bufidx];} char *fmtalloc(const char *format, ...){	struct strbuf sb = STRBUF_INIT;	va_list args; 	va_start(args, format);	strbuf_vaddf(&sb, format, args);	va_end(args); 	return strbuf_detach(&sb, NULL);} void html_raw(const char *data, size_t size){	if (write(STDOUT_FILENO, data, size) != size)		die_errno("write error on html output");} void html(const char *txt){	html_raw(txt, strlen(txt));} void htmlf(const char *format, ...){	va_list args;	struct strbuf buf = STRBUF_INIT; 	va_start(args, format);	strbuf_vaddf(&buf, format, args);	va_end(args);	html(buf.buf);	strbuf_release(&buf);} void html_txtf(const char *format, ...){	va_list args; 	va_start(args, format);	html_vtxtf(format, args);	va_end(args);} void html_vtxtf(const char *format, va_list ap){	va_list cp;	struct strbuf buf = STRBUF_INIT; 	va_copy(cp, ap);	strbuf_vaddf(&buf, format, cp);	va_end(cp);	html_txt(buf.buf);	strbuf_release(&buf);} void html_status(int code, const char *msg, int more_headers){	htmlf("Status: %d %s\n", code, msg);	if (!more_headers)		html("\n");} void html_txt(const char *txt){	const char *t = txt;	while (t && *t) {		int c = *t;		if (c == '<' || c == '>' || c == '&') {			html_raw(txt, t - txt);			if (c == '>')				html("&gt;");			else if (c == '<')				html("&lt;");			else if (c == '&')				html("&amp;");			txt = t + 1;		}		t++;	}	if (t != txt)		html(txt);} void html_ntxt(int len, const char *txt){	const char *t = txt;	while (t && *t && len--) {		int c = *t;		if (c == '<' || c == '>' || c == '&') {			html_raw(txt, t - txt);			if (c == '>')				html("&gt;");			else if (c == '<')				html("&lt;");			else if (c == '&')				html("&amp;");			txt = t + 1;		}		t++;	}	if (t != txt)		html_raw(txt, t - txt);	if (len < 0)		html("...");} void html_attrf(const char *fmt, ...){	va_list ap;	struct strbuf sb = STRBUF_INIT; 	va_start(ap, fmt);	strbuf_vaddf(&sb, fmt, ap);	va_end(ap); 	html_attr(sb.buf);	strbuf_release(&sb);} void html_attr(const char *txt){	const char *t = txt;	while (t && *t) {		int c = *t;		if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&') {			html_raw(txt, t - txt);			if (c == '>')				html("&gt;");			else if (c == '<')				html("&lt;");			else if (c == '\'')				html("&#x27;");			else if (c == '"')				html("&quot;");			else if (c == '&')				html("&amp;");			txt = t + 1;		}		t++;	}	if (t != txt)		html(txt);} void html_url_path(const char *txt){	const char *t = txt;	while (t && *t) {		unsigned char c = *t;		const char *e = url_escape_table[c];		if (e && c != '+' && c != '&') {			html_raw(txt, t - txt);			html(e);			txt = t + 1;		}		t++;	}	if (t != txt)		html(txt);} void html_url_arg(const char *txt){	const char *t = txt;	while (t && *t) {		unsigned char c = *t;		const char *e = url_escape_table[c];		if (c == ' ')			e = "+";		if (e) {			html_raw(txt, t - txt);			html(e);			txt = t + 1;		}		t++;	}	if (t != txt)		html(txt);} void html_hidden(const char *name, const char *value){	html("<input type='hidden' name='");	html_attr(name);	html("' value='");	html_attr(value);	html("'/>");} void html_option(const char *value, const char *text, const char *selected_value){	html("<option value='");	html_attr(value);	html("'");	if (selected_value && !strcmp(selected_value, value))		html(" selected='selected'");	html(">");	html_txt(text);	html("</option>\n");} void html_intoption(int value, const char *text, int selected_value){	htmlf("<option value='%d'%s>", value,	      value == selected_value ? " selected='selected'" : "");	html_txt(text);	html("</option>");} void html_link_open(const char *url, const char *title, const char *class){	html("<a href='");	html_attr(url);	if (title) {		html("' title='");		html_attr(title);	}	if (class) {		html("' class='");		html_attr(class);	}	html("'>");} void html_link_close(void){	html("</a>");} void html_fileperm(unsigned short mode){	htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),	      (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));} int html_include(const char *filename){	FILE *f;	char buf[4096];	size_t len; 	if (!(f = fopen(filename, "r"))) {		fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",			filename, strerror(errno), errno);		return -1;	}	while ((len = fread(buf, 1, 4096, f)) > 0)		html_raw(buf, len);	fclose(f);	return 0;} static int hextoint(char c){	if (c >= 'a' && c <= 'f')		return 10 + c - 'a';	else if (c >= 'A' && c <= 'F')		return 10 + c - 'A';	else if (c >= '0' && c <= '9')		return c - '0';	else		return -1;} static char *convert_query_hexchar(char *txt){	int d1, d2, n;	n = strlen(txt);	if (n < 3) {		*txt = '\0';		return txt-1;	}	d1 = hextoint(*(txt + 1));	d2 = hextoint(*(txt + 2));	if (d1 < 0 || d2 < 0) {		memmove(txt, txt + 3, n - 2);		return txt-1;	} else {		*txt = d1 * 16 + d2;		memmove(txt + 1, txt + 3, n - 2);		return txt;	}} int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value)){	char *o, *t, *txt, *value = NULL, c; 	if (!txt_)		return 0; 	o = t = txt = xstrdup(txt_);	while ((c=*t) != '\0') {		if (c == '=') {			*t = '\0';			value = t + 1;		} else if (c == '+') {			*t = ' ';		} else if (c == '%') {			t = convert_query_hexchar(t);		} else if (c == '&') {			*t = '\0';			(*fn)(txt, value);			txt = t + 1;			value = NULL;		}		t++;	}	if (t != txt)		(*fn)(txt, value);	free(o);	return 0;}