html.c

   1 /* html.c: helper functions for html output
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include <unistd.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <stdarg.h>
  13 #include <string.h>
  14 #include <errno.h>
  15
  16 int htmlfd = STDOUT_FILENO;
  17
  18 char *fmt(const char *format, ...)
  19 {
  20         static char buf[8][1024];
  21         static int bufidx;
  22         int len;
  23         va_list args;
  24
  25         bufidx++;
  26         bufidx &= 7;
  27
  28         va_start(args, format);
  29         len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);
  30         va_end(args);
  31         if (len>sizeof(buf[bufidx])) {
  32                 fprintf(stderr, "[html.c] string truncated: %s\n", format);
  33                 exit(1);
  34         }
  35         return buf[bufidx];
  36 }
  37
  38 void html_raw(const char *data, size_t size)
  39 {
  40         write(htmlfd, data, size);
  41 }
  42
  43 void html(const char *txt)
  44 {
  45         write(htmlfd, txt, strlen(txt));
  46 }
  47
  48 void htmlf(const char *format, ...)
  49 {
  50         static char buf[65536];
  51         va_list args;
  52
  53         va_start(args, format);
  54         vsnprintf(buf, sizeof(buf), format, args);
  55         va_end(args);
  56         html(buf);
  57 }
  58
  59 void html_status(int code, const char *msg, int more_headers)
  60 {
  61         htmlf("Status: %d %s\n", code, msg);
  62         if (!more_headers)
  63                 html("\n");
  64 }
  65
  66 void html_txt(char *txt)
  67 {
  68         char *t = txt;
  69         while(t && *t){
  70                 int c = *t;
  71                 if (c=='<' || c=='>' || c=='&') {
  72                         write(htmlfd, txt, t - txt);
  73                         if (c=='>')
  74                                 html("&gt;");
  75                         else if (c=='<')
  76                                 html("&lt;");
  77                         else if (c=='&')
  78                                 html("&amp;");
  79                         txt = t+1;
  80                 }
  81                 t++;
  82         }
  83         if (t!=txt)
  84                 html(txt);
  85 }
  86
  87 void html_ntxt(int len, char *txt)
  88 {
  89         char *t = txt;
  90         while(t && *t && len--){
  91                 int c = *t;
  92                 if (c=='<' || c=='>' || c=='&') {
  93                         write(htmlfd, txt, t - txt);
  94                         if (c=='>')
  95                                 html("&gt;");
  96                         else if (c=='<')
  97                                 html("&lt;");
  98                         else if (c=='&')
  99                                 html("&amp;");
 100                         txt = t+1;
 101                 }
 102                 t++;
 103         }
 104         if (t!=txt)
 105                 write(htmlfd, txt, t - txt);
 106         if (len<0)
 107                 html("...");
 108 }
 109
 110 void html_attr(char *txt)
 111 {
 112         char *t = txt;
 113         while(t && *t){
 114                 int c = *t;
 115                 if (c=='<' || c=='>' || c=='\'') {
 116                         write(htmlfd, txt, t - txt);
 117                         if (c=='>')
 118                                 html("&gt;");
 119                         else if (c=='<')
 120                                 html("&lt;");
 121                         else if (c=='\'')
 122                                 html("&quote;");
 123                         txt = t+1;
 124                 }
 125                 t++;
 126         }
 127         if (t!=txt)
 128                 html(txt);
 129 }
 130
 131 void html_url_path(char *txt)
 132 {
 133         char *t = txt;
 134         while(t && *t){
 135                 int c = *t;
 136                 if (c=='"' || c=='#' || c=='\'' || c=='?') {
 137                         write(htmlfd, txt, t - txt);
 138                         write(htmlfd, fmt("%%%2x", c), 3);
 139                         txt = t+1;
 140                 }
 141                 t++;
 142         }
 143         if (t!=txt)
 144                 html(txt);
 145 }
 146
 147 void html_url_arg(char *txt)
 148 {
 149         char *t = txt;
 150         while(t && *t){
 151                 int c = *t;
 152                 if (c=='"' || c=='#' || c=='%' || c=='&' || c=='\'' || c=='+' || c=='?') {
 153                         write(htmlfd, txt, t - txt);
 154                         write(htmlfd, fmt("%%%2x", c), 3);
 155                         txt = t+1;
 156                 }
 157                 t++;
 158         }
 159         if (t!=txt)
 160                 html(txt);
 161 }
 162
 163 void html_hidden(char *name, char *value)
 164 {
 165         html("<input type='hidden' name='");
 166         html_attr(name);
 167         html("' value='");
 168         html_attr(value);
 169         html("'/>");
 170 }
 171
 172 void html_option(char *value, char *text, char *selected_value)
 173 {
 174         html("<option value='");
 175         html_attr(value);
 176         html("'");
 177         if (selected_value && !strcmp(selected_value, value))
 178                 html(" selected='selected'");
 179         html(">");
 180         html_txt(text);
 181         html("</option>\n");
 182 }
 183
 184 void html_link_open(char *url, char *title, char *class)
 185 {
 186         html("<a href='");
 187         html_attr(url);
 188         if (title) {
 189                 html("' title='");
 190                 html_attr(title);
 191         }
 192         if (class) {
 193                 html("' class='");
 194                 html_attr(class);
 195         }
 196         html("'>");
 197 }
 198
 199 void html_link_close(void)
 200 {
 201         html("</a>");
 202 }
 203
 204 void html_fileperm(unsigned short mode)
 205 {
 206         htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
 207               (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
 208 }
 209
 210 int html_include(const char *filename)
 211 {
 212         FILE *f;
 213         char buf[4096];
 214         size_t len;
 215
 216         if (!(f = fopen(filename, "r"))) {
 217                 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
 218                         filename, strerror(errno), errno);
 219                 return -1;
 220         }
 221         while((len = fread(buf, 1, 4096, f)) > 0)
 222                 write(htmlfd, buf, len);
 223         fclose(f);
 224         return 0;
 225 }
 226
 227 int hextoint(char c)
 228 {
 229         if (c >= 'a' && c <= 'f')
 230                 return 10 + c - 'a';
 231         else if (c >= 'A' && c <= 'F')
 232                 return 10 + c - 'A';
 233         else if (c >= '0' && c <= '9')
 234                 return c - '0';
 235         else
 236                 return -1;
 237 }
 238
 239 char *convert_query_hexchar(char *txt)
 240 {
 241         int d1, d2;
 242         if (strlen(txt) < 3) {
 243                 *txt = '\0';
 244                 return txt-1;
 245         }
 246         d1 = hextoint(*(txt+1));
 247         d2 = hextoint(*(txt+2));
 248         if (d1<0 || d2<0) {
 249                 strcpy(txt, txt+3);
 250                 return txt-1;
 251         } else {
 252                 *txt = d1 * 16 + d2;
 253                 strcpy(txt+1, txt+3);
 254                 return txt;
 255         }
 256 }
 257
 258 int http_parse_querystring(char *txt, void (*fn)(const char *name, const char *value))
 259 {
 260         char *t, *value = NULL, c;
 261
 262         if (!txt)
 263                 return 0;
 264
 265         t = txt = strdup(txt);
 266         if (t == NULL) {
 267                 printf("Out of memory\n");
 268                 exit(1);
 269         }
 270         while((c=*t) != '\0') {
 271                 if (c=='=') {
 272                         *t = '\0';
 273                         value = t+1;
 274                 } else if (c=='+') {
 275                         *t = ' ';
 276                 } else if (c=='%') {
 277                         t = convert_query_hexchar(t);
 278                 } else if (c=='&') {
 279                         *t = '\0';
 280                         (*fn)(txt, value);
 281                         txt = t+1;
 282                         value = NULL;
 283                 }
 284                 t++;
 285         }
 286         if (t!=txt)
 287                 (*fn)(txt, value);
 288         return 0;
 289 }