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321 lines
6.5 KiB
C
321 lines
6.5 KiB
C
/* html.c: helper functions for html output
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*
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* Copyright (C) 2006 Lars Hjemli
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*
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* Licensed under GNU General Public License v2
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* (see COPYING for full license text)
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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/* Percent-encoding of each character, except: a-zA-Z0-9!$()*,./:;@- */
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static const char* url_escape_table[256] = {
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"%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07", "%08", "%09",
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"%0a", "%0b", "%0c", "%0d", "%0e", "%0f", "%10", "%11", "%12", "%13",
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"%14", "%15", "%16", "%17", "%18", "%19", "%1a", "%1b", "%1c", "%1d",
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"%1e", "%1f", "+", 0, "%22", "%23", 0, "%25", "%26", "%27", 0, 0, 0,
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"%2b", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%3c", "%3d",
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"%3e", "%3f", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, "%5c", 0, "%5e", 0, "%60", 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "%7b",
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"%7c", "%7d", 0, "%7f", "%80", "%81", "%82", "%83", "%84", "%85",
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"%86", "%87", "%88", "%89", "%8a", "%8b", "%8c", "%8d", "%8e", "%8f",
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"%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97", "%98", "%99",
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"%9a", "%9b", "%9c", "%9d", "%9e", "%9f", "%a0", "%a1", "%a2", "%a3",
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"%a4", "%a5", "%a6", "%a7", "%a8", "%a9", "%aa", "%ab", "%ac", "%ad",
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"%ae", "%af", "%b0", "%b1", "%b2", "%b3", "%b4", "%b5", "%b6", "%b7",
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"%b8", "%b9", "%ba", "%bb", "%bc", "%bd", "%be", "%bf", "%c0", "%c1",
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"%c2", "%c3", "%c4", "%c5", "%c6", "%c7", "%c8", "%c9", "%ca", "%cb",
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"%cc", "%cd", "%ce", "%cf", "%d0", "%d1", "%d2", "%d3", "%d4", "%d5",
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"%d6", "%d7", "%d8", "%d9", "%da", "%db", "%dc", "%dd", "%de", "%df",
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"%e0", "%e1", "%e2", "%e3", "%e4", "%e5", "%e6", "%e7", "%e8", "%e9",
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"%ea", "%eb", "%ec", "%ed", "%ee", "%ef", "%f0", "%f1", "%f2", "%f3",
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"%f4", "%f5", "%f6", "%f7", "%f8", "%f9", "%fa", "%fb", "%fc", "%fd",
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"%fe", "%ff"
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};
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int htmlfd = STDOUT_FILENO;
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char *fmt(const char *format, ...)
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{
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static char buf[8][1024];
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static int bufidx;
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int len;
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va_list args;
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bufidx++;
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bufidx &= 7;
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va_start(args, format);
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len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);
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va_end(args);
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if (len>sizeof(buf[bufidx])) {
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fprintf(stderr, "[html.c] string truncated: %s\n", format);
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exit(1);
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}
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return buf[bufidx];
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}
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void html_raw(const char *data, size_t size)
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{
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write(htmlfd, data, size);
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}
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void html(const char *txt)
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{
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write(htmlfd, txt, strlen(txt));
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}
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void htmlf(const char *format, ...)
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{
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static char buf[65536];
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va_list args;
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va_start(args, format);
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vsnprintf(buf, sizeof(buf), format, args);
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va_end(args);
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html(buf);
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}
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void html_status(int code, const char *msg, int more_headers)
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{
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htmlf("Status: %d %s\n", code, msg);
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if (!more_headers)
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html("\n");
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}
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void html_txt(const char *txt)
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{
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const char *t = txt;
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while(t && *t){
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int c = *t;
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if (c=='<' || c=='>' || c=='&') {
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html_raw(txt, t - txt);
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if (c=='>')
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html(">");
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else if (c=='<')
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html("<");
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else if (c=='&')
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html("&");
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txt = t+1;
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}
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t++;
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}
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if (t!=txt)
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html(txt);
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}
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void html_ntxt(int len, const char *txt)
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{
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const char *t = txt;
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while(t && *t && len--){
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int c = *t;
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if (c=='<' || c=='>' || c=='&') {
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html_raw(txt, t - txt);
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if (c=='>')
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html(">");
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else if (c=='<')
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html("<");
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else if (c=='&')
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html("&");
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txt = t+1;
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}
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t++;
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}
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if (t!=txt)
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html_raw(txt, t - txt);
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if (len<0)
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html("...");
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}
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void html_attr(const char *txt)
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{
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const char *t = txt;
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while(t && *t){
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int c = *t;
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if (c=='<' || c=='>' || c=='\'' || c=='\"') {
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html_raw(txt, t - txt);
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if (c=='>')
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html(">");
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else if (c=='<')
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html("<");
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else if (c=='\'')
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html("'");
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else if (c=='"')
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html(""");
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txt = t+1;
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}
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t++;
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}
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if (t!=txt)
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html(txt);
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}
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void html_url_path(const char *txt)
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{
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const char *t = txt;
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while(t && *t){
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int c = *t;
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const char *e = url_escape_table[c];
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if (e && c!='+' && c!='&' && c!='+') {
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html_raw(txt, t - txt);
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html_raw(e, 3);
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txt = t+1;
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}
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t++;
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}
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if (t!=txt)
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html(txt);
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}
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void html_url_arg(const char *txt)
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{
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const char *t = txt;
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while(t && *t){
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int c = *t;
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const char *e = url_escape_table[c];
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if (e) {
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html_raw(txt, t - txt);
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html_raw(e, strlen(e));
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txt = t+1;
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}
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t++;
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}
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if (t!=txt)
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html(txt);
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}
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void html_hidden(const char *name, const char *value)
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{
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html("<input type='hidden' name='");
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html_attr(name);
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html("' value='");
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html_attr(value);
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html("'/>");
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}
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void html_option(const char *value, const char *text, const char *selected_value)
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{
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html("<option value='");
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html_attr(value);
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html("'");
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if (selected_value && !strcmp(selected_value, value))
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html(" selected='selected'");
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html(">");
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html_txt(text);
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html("</option>\n");
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}
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void html_link_open(const char *url, const char *title, const char *class)
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{
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html("<a href='");
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html_attr(url);
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if (title) {
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html("' title='");
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html_attr(title);
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}
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if (class) {
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html("' class='");
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html_attr(class);
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}
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html("'>");
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}
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void html_link_close(void)
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{
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html("</a>");
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}
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void html_fileperm(unsigned short mode)
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{
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htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
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(mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
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}
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int html_include(const char *filename)
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{
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FILE *f;
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char buf[4096];
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size_t len;
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if (!(f = fopen(filename, "r"))) {
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fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
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filename, strerror(errno), errno);
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return -1;
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}
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while((len = fread(buf, 1, 4096, f)) > 0)
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html_raw(buf, len);
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fclose(f);
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return 0;
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}
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int hextoint(char c)
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{
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if (c >= 'a' && c <= 'f')
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return 10 + c - 'a';
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else if (c >= 'A' && c <= 'F')
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return 10 + c - 'A';
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else if (c >= '0' && c <= '9')
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return c - '0';
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else
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return -1;
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}
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char *convert_query_hexchar(char *txt)
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{
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int d1, d2, n;
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n = strlen(txt);
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if (n < 3) {
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*txt = '\0';
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return txt-1;
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}
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d1 = hextoint(*(txt+1));
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d2 = hextoint(*(txt+2));
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if (d1<0 || d2<0) {
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memmove(txt, txt+3, n-3);
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return txt-1;
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} else {
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*txt = d1 * 16 + d2;
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memmove(txt+1, txt+3, n-2);
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return txt;
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}
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}
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int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value))
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{
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char *t, *txt, *value = NULL, c;
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if (!txt_)
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return 0;
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t = txt = strdup(txt_);
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if (t == NULL) {
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printf("Out of memory\n");
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exit(1);
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}
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while((c=*t) != '\0') {
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if (c=='=') {
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*t = '\0';
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value = t+1;
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} else if (c=='+') {
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*t = ' ';
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} else if (c=='%') {
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t = convert_query_hexchar(t);
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} else if (c=='&') {
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*t = '\0';
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(*fn)(txt, value);
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txt = t+1;
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value = NULL;
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}
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t++;
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}
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if (t!=txt)
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(*fn)(txt, value);
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return 0;
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}
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