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=='\'' || 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("&#x27;");
 123                         else if (c=='"')
 124                                 html("&quot;");
 125                         txt = t+1;
 126                 }
 127                 t++;
 128         }
 129         if (t!=txt)
 130                 html(txt);
 131 }
 132
 133 void html_url_path(char *txt)
 134 {
 135         char *t = txt;
 136         while(t && *t){
 137                 int c = *t;
 138                 if (c=='"' || c=='#' || c=='\'' || c=='?') {
 139                         write(htmlfd, txt, t - txt);
 140                         write(htmlfd, fmt("%%%2x", c), 3);
 141                         txt = t+1;
 142                 }
 143                 t++;
 144         }
 145         if (t!=txt)
 146                 html(txt);
 147 }
 148
 149 void html_url_arg(char *txt)
 150 {
 151         char *t = txt;
 152         while(t && *t){
 153                 int c = *t;
 154                 if (c=='"' || c=='#' || c=='%' || c=='&' || c=='\'' || c=='+' || c=='?') {
 155                         write(htmlfd, txt, t - txt);
 156                         write(htmlfd, fmt("%%%2x", c), 3);
 157                         txt = t+1;
 158                 }
 159                 t++;
 160         }
 161         if (t!=txt)
 162                 html(txt);
 163 }
 164
 165 void html_hidden(char *name, char *value)
 166 {
 167         html("<input type='hidden' name='");
 168         html_attr(name);
 169         html("' value='");
 170         html_attr(value);
 171         html("'/>");
 172 }
 173
 174 void html_option(char *value, char *text, char *selected_value)
 175 {
 176         html("<option value='");
 177         html_attr(value);
 178         html("'");
 179         if (selected_value && !strcmp(selected_value, value))
 180                 html(" selected='selected'");
 181         html(">");
 182         html_txt(text);
 183         html("</option>\n");
 184 }
 185
 186 void html_link_open(char *url, char *title, char *class)
 187 {
 188         html("<a href='");
 189         html_attr(url);
 190         if (title) {
 191                 html("' title='");
 192                 html_attr(title);
 193         }
 194         if (class) {
 195                 html("' class='");
 196                 html_attr(class);
 197         }
 198         html("'>");
 199 }
 200
 201 void html_link_close(void)
 202 {
 203         html("</a>");
 204 }
 205
 206 void html_fileperm(unsigned short mode)
 207 {
 208         htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
 209               (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
 210 }
 211
 212 int html_include(const char *filename)
 213 {
 214         FILE *f;
 215         char buf[4096];
 216         size_t len;
 217
 218         if (!(f = fopen(filename, "r"))) {
 219                 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
 220                         filename, strerror(errno), errno);
 221                 return -1;
 222         }
 223         while((len = fread(buf, 1, 4096, f)) > 0)
 224                 write(htmlfd, buf, len);
 225         fclose(f);
 226         return 0;
 227 }
 228
 229 int hextoint(char c)
 230 {
 231         if (c >= 'a' && c <= 'f')
 232                 return 10 + c - 'a';
 233         else if (c >= 'A' && c <= 'F')
 234                 return 10 + c - 'A';
 235         else if (c >= '0' && c <= '9')
 236                 return c - '0';
 237         else
 238                 return -1;
 239 }
 240
 241 char *convert_query_hexchar(char *txt)
 242 {
 243         int d1, d2, n;
 244         n = strlen(txt);
 245         if (n < 3) {
 246                 *txt = '\0';
 247                 return txt-1;
 248         }
 249         d1 = hextoint(*(txt+1));
 250         d2 = hextoint(*(txt+2));
 251         if (d1<0 || d2<0) {
 252                 memmove(txt, txt+3, n-2);
 253                 return txt-1;
 254         } else {
 255                 *txt = d1 * 16 + d2;
 256                 memmove(txt+1, txt+3, n-2);
 257                 return txt;
 258         }
 259 }
 260
 261 int http_parse_querystring(char *txt, void (*fn)(const char *name, const char *value))
 262 {
 263         char *t, *value = NULL, c;
 264
 265         if (!txt)
 266                 return 0;
 267
 268         t = txt = strdup(txt);
 269         if (t == NULL) {
 270                 printf("Out of memory\n");
 271                 exit(1);
 272         }
 273         while((c=*t) != '\0') {
 274                 if (c=='=') {
 275                         *t = '\0';
 276                         value = t+1;
 277                 } else if (c=='+') {
 278                         *t = ' ';
 279                 } else if (c=='%') {
 280                         t = convert_query_hexchar(t);
 281                 } else if (c=='&') {
 282                         *t = '\0';
 283                         (*fn)(txt, value);
 284                         txt = t+1;
 285                         value = NULL;
 286                 }
 287                 t++;
 288         }
 289         if (t!=txt)
 290                 (*fn)(txt, value);
 291         return 0;
 292 }