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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>
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(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_txt(char *txt)
{
char *t = txt;
while(t && *t){
int c = *t;
if (c=='<' || c=='>' || c=='&') {
write(htmlfd, 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, char *txt)
{
char *t = txt;
while(t && *t && len--){
int c = *t;
if (c=='<' || c=='>' || c=='&') {
write(htmlfd, txt, t - txt);
if (c=='>')
html(">");
else if (c=='<')
html("<");
else if (c=='&')
html("&");
txt = t+1;
}
t++;
}
if (t!=txt)
write(htmlfd, txt, t - txt);
if (len<0)
html("...");
}
void html_attr(char *txt)
{
char *t = txt;
while(t && *t){
int c = *t;
if (c=='<' || c=='>' || c=='\'') {
write(htmlfd, txt, t - txt);
if (c=='>')
html(">");
else if (c=='<')
html("<");
else if (c=='\'')
html(""e;");
txt = t+1;
}
t++;
}
if (t!=txt)
html(txt);
}
void html_hidden(char *name, char *value)
{
html("<input type='hidden' name='");
html_attr(name);
html("' value='");
html_attr(value);
html("'/>");
}
void html_option(char *value, char *text, 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(char *url, char *title, 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")))
return -1;
while((len = fread(buf, 1, 4096, f)) > 0)
write(htmlfd, 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;
if (strlen(txt) < 3) {
*txt = '\0';
return txt-1;
}
d1 = hextoint(*(txt+1));
d2 = hextoint(*(txt+2));
if (d1<0 || d2<0) {
strcpy(txt, txt+3);
return txt-1;
} else {
*txt = d1 * 16 + d2;
strcpy(txt+1, txt+3);
return txt;
}
}
int http_parse_querystring(char *txt, void (*fn)(const char *name, const char *value))
{
char *t, *value = NULL, c;
if (!txt)
return 0;
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);
return 0;
}
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