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(const char *txt)
  39 {
  40         write(htmlfd, txt, strlen(txt));
  41 }
  42
  43 void htmlf(const char *format, ...)
  44 {
  45         static char buf[65536];
  46         va_list args;
  47
  48         va_start(args, format);
  49         vsnprintf(buf, sizeof(buf), format, args);
  50         va_end(args);
  51         html(buf);
  52 }
  53
  54 void html_txt(char *txt)
  55 {
  56         char *t = txt;
  57         while(t && *t){
  58                 int c = *t;
  59                 if (c=='<' || c=='>' || c=='&') {
  60                         write(htmlfd, txt, t - txt);
  61                         if (c=='>')
  62                                 html("&gt;");
  63                         else if (c=='<')
  64                                 html("&lt;");
  65                         else if (c=='&')
  66                                 html("&amp;");
  67                         txt = t+1;
  68                 }
  69                 t++;
  70         }
  71         if (t!=txt)
  72                 html(txt);
  73 }
  74
  75 void html_ntxt(int len, char *txt)
  76 {
  77         char *t = txt;
  78         while(t && *t && len--){
  79                 int c = *t;
  80                 if (c=='<' || c=='>' || c=='&') {
  81                         write(htmlfd, txt, t - txt);
  82                         if (c=='>')
  83                                 html("&gt;");
  84                         else if (c=='<')
  85                                 html("&lt;");
  86                         else if (c=='&')
  87                                 html("&amp;");
  88                         txt = t+1;
  89                 }
  90                 t++;
  91         }
  92         if (t!=txt)
  93                 write(htmlfd, txt, t - txt);
  94         if (len<0)
  95                 html("...");
  96 }
  97
  98 void html_attr(char *txt)
  99 {
 100         char *t = txt;
 101         while(t && *t){
 102                 int c = *t;
 103                 if (c=='<' || c=='>' || c=='\'') {
 104                         write(htmlfd, txt, t - txt);
 105                         if (c=='>')
 106                                 html("&gt;");
 107                         else if (c=='<')
 108                                 html("&lt;");
 109                         else if (c=='\'')
 110                                 html("&quote;");
 111                         txt = t+1;
 112                 }
 113                 t++;
 114         }
 115         if (t!=txt)
 116                 html(txt);
 117 }
 118
 119 void html_hidden(char *name, char *value)
 120 {
 121         html("<input type='hidden' name='");
 122         html_attr(name);
 123         html("' value='");
 124         html_attr(value);
 125         html("'/>");
 126 }
 127
 128 void html_option(char *value, char *text, char *selected_value)
 129 {
 130         html("<option value='");
 131         html_attr(value);
 132         html("'");
 133         if (selected_value && !strcmp(selected_value, value))
 134                 html(" selected='selected'");
 135         html(">");
 136         html_txt(text);
 137         html("</option>\n");
 138 }
 139
 140 void html_link_open(char *url, char *title, char *class)
 141 {
 142         html("<a href='");
 143         html_attr(url);
 144         if (title) {
 145                 html("' title='");
 146                 html_attr(title);
 147         }
 148         if (class) {
 149                 html("' class='");
 150                 html_attr(class);
 151         }
 152         html("'>");
 153 }
 154
 155 void html_link_close(void)
 156 {
 157         html("</a>");
 158 }
 159
 160 void html_fileperm(unsigned short mode)
 161 {
 162         htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
 163               (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
 164 }
 165
 166 int html_include(const char *filename)
 167 {
 168         FILE *f;
 169         char buf[4096];
 170         size_t len;
 171
 172         if (!(f = fopen(filename, "r"))) {
 173                 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
 174                         filename, strerror(errno), errno);
 175                 return -1;
 176         }
 177         while((len = fread(buf, 1, 4096, f)) > 0)
 178                 write(htmlfd, buf, len);
 179         fclose(f);
 180         return 0;
 181 }
 182
 183 int hextoint(char c)
 184 {
 185         if (c >= 'a' && c <= 'f')
 186                 return 10 + c - 'a';
 187         else if (c >= 'A' && c <= 'F')
 188                 return 10 + c - 'A';
 189         else if (c >= '0' && c <= '9')
 190                 return c - '0';
 191         else
 192                 return -1;
 193 }
 194
 195 char *convert_query_hexchar(char *txt)
 196 {
 197         int d1, d2;
 198         if (strlen(txt) < 3) {
 199                 *txt = '\0';
 200                 return txt-1;
 201         }
 202         d1 = hextoint(*(txt+1));
 203         d2 = hextoint(*(txt+2));
 204         if (d1<0 || d2<0) {
 205                 strcpy(txt, txt+3);
 206                 return txt-1;
 207         } else {
 208                 *txt = d1 * 16 + d2;
 209                 strcpy(txt+1, txt+3);
 210                 return txt;
 211         }
 212 }
 213
 214 int http_parse_querystring(char *txt, void (*fn)(const char *name, const char *value))
 215 {
 216         char *t, *value = NULL, c;
 217
 218         if (!txt)
 219                 return 0;
 220
 221         t = txt = strdup(txt);
 222         if (t == NULL) {
 223                 printf("Out of memory\n");
 224                 exit(1);
 225         }
 226         while((c=*t) != '\0') {
 227                 if (c=='=') {
 228                         *t = '\0';
 229                         value = t+1;
 230                 } else if (c=='+') {
 231                         *t = ' ';
 232                 } else if (c=='%') {
 233                         t = convert_query_hexchar(t);
 234                 } else if (c=='&') {
 235                         *t = '\0';
 236                         (*fn)(txt, value);
 237                         txt = t+1;
 238                         value = NULL;
 239                 }
 240                 t++;
 241         }
 242         if (t!=txt)
 243                 (*fn)(txt, value);
 244         return 0;
 245 }