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