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   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
  15 int htmlfd = STDOUT_FILENO;
  16
  17 char *fmt(const char *format, ...)
  18 {
  19         static char buf[8][1024];
  20         static int bufidx;
  21         int len;
  22         va_list args;
  23
  24         bufidx++;
  25         bufidx &= 7;
  26
  27         va_start(args, format);
  28         len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);
  29         va_end(args);
  30         if (len>sizeof(buf[bufidx])) {
  31                 fprintf(stderr, "[html.c] string truncated: %s\n", format);
  32                 exit(1);
  33         }
  34         return buf[bufidx];
  35 }
  36
  37 void html(const char *txt)
  38 {
  39         write(htmlfd, txt, strlen(txt));
  40 }
  41
  42 void htmlf(const char *format, ...)
  43 {
  44         static char buf[65536];
  45         va_list args;
  46
  47         va_start(args, format);
  48         vsnprintf(buf, sizeof(buf), format, args);
  49         va_end(args);
  50         html(buf);
  51 }
  52
  53 void html_txt(char *txt)
  54 {
  55         char *t = txt;
  56         while(t && *t){
  57                 int c = *t;
  58                 if (c=='<' || c=='>' || c=='&') {
  59                         *t = '\0';
  60                         html(txt);
  61                         *t = c;
  62                         if (c=='>')
  63                                 html("&gt;");
  64                         else if (c=='<')
  65                                 html("&lt;");
  66                         else if (c=='&')
  67                                 html("&amp;");
  68                         txt = t+1;
  69                 }
  70                 t++;
  71         }
  72         if (t!=txt)
  73                 html(txt);
  74 }
  75
  76 void html_ntxt(int len, char *txt)
  77 {
  78         char *t = txt;
  79         while(t && *t && len--){
  80                 int c = *t;
  81                 if (c=='<' || c=='>' || c=='&') {
  82                         *t = '\0';
  83                         html(txt);
  84                         *t = c;
  85                         if (c=='>')
  86                                 html("&gt;");
  87                         else if (c=='<')
  88                                 html("&lt;");
  89                         else if (c=='&')
  90                                 html("&amp;");
  91                         txt = t+1;
  92                 }
  93                 t++;
  94         }
  95         if (t!=txt) {
  96                 char c = *t;
  97                 *t = '\0';
  98                 html(txt);
  99                 *t = c;
 100         }
 101         if (len<0)
 102                 html("...");
 103 }
 104
 105 void html_attr(char *txt)
 106 {
 107         char *t = txt;
 108         while(t && *t){
 109                 int c = *t;
 110                 if (c=='<' || c=='>' || c=='\'') {
 111                         *t = '\0';
 112                         html(txt);
 113                         *t = c;
 114                         if (c=='>')
 115                                 html("&gt;");
 116                         else if (c=='<')
 117                                 html("&lt;");
 118                         else if (c=='\'')
 119                                 html("&quote;");
 120                         txt = t+1;
 121                 }
 122                 t++;
 123         }
 124         if (t!=txt)
 125                 html(txt);
 126 }
 127
 128 void html_hidden(char *name, char *value)
 129 {
 130         html("<input type='hidden' name='");
 131         html_attr(name);
 132         html("' value='");
 133         html_attr(value);
 134         html("'/>");
 135 }
 136
 137 void html_option(char *value, char *text, char *selected_value)
 138 {
 139         html("<option value='");
 140         html_attr(value);
 141         html("'");
 142         if (selected_value && !strcmp(selected_value, value))
 143                 html(" selected='selected'");
 144         html(">");
 145         html_txt(text);
 146         html("</option>\n");
 147 }
 148
 149 void html_link_open(char *url, char *title, char *class)
 150 {
 151         html("<a href='");
 152         html_attr(url);
 153         if (title) {
 154                 html("' title='");
 155                 html_attr(title);
 156         }
 157         if (class) {
 158                 html("' class='");
 159                 html_attr(class);
 160         }
 161         html("'>");
 162 }
 163
 164 void html_link_close(void)
 165 {
 166         html("</a>");
 167 }
 168
 169 void html_fileperm(unsigned short mode)
 170 {
 171         htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
 172               (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
 173 }
 174
 175 int html_include(const char *filename)
 176 {
 177         FILE *f;
 178         char buf[4096];
 179         size_t len;
 180
 181         if (!(f = fopen(filename, "r")))
 182                 return -1;
 183         while((len = fread(buf, 1, 4096, f)) > 0)
 184                 write(htmlfd, buf, len);
 185         fclose(f);
 186         return 0;
 187 }