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/* html.c: helper functions for html output
*
* Copyright (C) 2006 Lars Hjemli
*
* Licensed under GNU General Public License v2
* (see COPYING for full license text)
*/
#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"
};
int htmlfd = STDOUT_FILENO;
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];
}
void html_raw(const char *data, size_t size)
{
write(htmlfd, data, size);
}
void html(const char *txt)
{
write(htmlfd, txt, strlen(txt));
}
void htmlf(const char *format, ...)
{
static char buf[65536];
va_list args;
va_start(args, format);
vsnprintf(buf, sizeof(buf), format, args);
va_end(args);
html(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(">");
else if (c=='<')
html("<");
else if (c=='&')
html("&");
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(">");
else if (c=='<')
html("<");
else if (c=='&')
html("&");
txt = t+1;
}
t++;
}
if (t!=txt)
html_raw(txt, t - txt);
if (len<0)
html("...");
}
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(">");
else if (c=='<')
html("<");
else if (c=='\'')
html("'");
else if (c=='"')
html(""");
else if (c=='&')
html("&");
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_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;
}
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;
}
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 = strdup(txt_);
if (t == NULL) {
printf("Out of memory\n");
exit(1);
}
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;
}
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