html.c

   1 /* html.c: helper functions for html output
   2  *
   3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include "cgit.h"
  10 #include "html.h"
  11 #include "url.h"
  12
  13 /* Percent-encoding of each character, except: a-zA-Z0-9!$()*,./:;@- */
  14 static const char* url_escape_table[256] = {
  15         "%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07",
  16         "%08", "%09", "%0a", "%0b", "%0c", "%0d", "%0e", "%0f",
  17         "%10", "%11", "%12", "%13", "%14", "%15", "%16", "%17",
  18         "%18", "%19", "%1a", "%1b", "%1c", "%1d", "%1e", "%1f",
  19         "%20", NULL,  "%22", "%23", NULL,  "%25", "%26", "%27",
  20         NULL,  NULL,  NULL,  "%2b", NULL,  NULL,  NULL,  NULL,
  21         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  22         NULL,  NULL,  NULL,  NULL,  "%3c", "%3d", "%3e", "%3f",
  23         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  24         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  25         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  26         NULL,  NULL,  NULL,  NULL,  "%5c", NULL,  "%5e", NULL,
  27         "%60", NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  28         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  29         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  30         NULL,  NULL,  NULL,  "%7b", "%7c", "%7d", NULL,  "%7f",
  31         "%80", "%81", "%82", "%83", "%84", "%85", "%86", "%87",
  32         "%88", "%89", "%8a", "%8b", "%8c", "%8d", "%8e", "%8f",
  33         "%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97",
  34         "%98", "%99", "%9a", "%9b", "%9c", "%9d", "%9e", "%9f",
  35         "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%a7",
  36         "%a8", "%a9", "%aa", "%ab", "%ac", "%ad", "%ae", "%af",
  37         "%b0", "%b1", "%b2", "%b3", "%b4", "%b5", "%b6", "%b7",
  38         "%b8", "%b9", "%ba", "%bb", "%bc", "%bd", "%be", "%bf",
  39         "%c0", "%c1", "%c2", "%c3", "%c4", "%c5", "%c6", "%c7",
  40         "%c8", "%c9", "%ca", "%cb", "%cc", "%cd", "%ce", "%cf",
  41         "%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
  42         "%d8", "%d9", "%da", "%db", "%dc", "%dd", "%de", "%df",
  43         "%e0", "%e1", "%e2", "%e3", "%e4", "%e5", "%e6", "%e7",
  44         "%e8", "%e9", "%ea", "%eb", "%ec", "%ed", "%ee", "%ef",
  45         "%f0", "%f1", "%f2", "%f3", "%f4", "%f5", "%f6", "%f7",
  46         "%f8", "%f9", "%fa", "%fb", "%fc", "%fd", "%fe", "%ff"
  47 };
  48
  49 char *fmt(const char *format, ...)
  50 {
  51         static char buf[8][1024];
  52         static int bufidx;
  53         int len;
  54         va_list args;
  55
  56         bufidx++;
  57         bufidx &= 7;
  58
  59         va_start(args, format);
  60         len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);
  61         va_end(args);
  62         if (len > sizeof(buf[bufidx])) {
  63                 fprintf(stderr, "[html.c] string truncated: %s\n", format);
  64                 exit(1);
  65         }
  66         return buf[bufidx];
  67 }
  68
  69 char *fmtalloc(const char *format, ...)
  70 {
  71         struct strbuf sb = STRBUF_INIT;
  72         va_list args;
  73
  74         va_start(args, format);
  75         strbuf_vaddf(&sb, format, args);
  76         va_end(args);
  77
  78         return strbuf_detach(&sb, NULL);
  79 }
  80
  81 void html_raw(const char *data, size_t size)
  82 {
  83         if (write(STDOUT_FILENO, data, size) != size)
  84                 die_errno("write error on html output");
  85 }
  86
  87 void html(const char *txt)
  88 {
  89         html_raw(txt, strlen(txt));
  90 }
  91
  92 void htmlf(const char *format, ...)
  93 {
  94         va_list args;
  95         struct strbuf buf = STRBUF_INIT;
  96
  97         va_start(args, format);
  98         strbuf_vaddf(&buf, format, args);
  99         va_end(args);
 100         html(buf.buf);
 101         strbuf_release(&buf);
 102 }
 103
 104 void html_txtf(const char *format, ...)
 105 {
 106         va_list args;
 107
 108         va_start(args, format);
 109         html_vtxtf(format, args);
 110         va_end(args);
 111 }
 112
 113 void html_vtxtf(const char *format, va_list ap)
 114 {
 115         va_list cp;
 116         struct strbuf buf = STRBUF_INIT;
 117
 118         va_copy(cp, ap);
 119         strbuf_vaddf(&buf, format, cp);
 120         va_end(cp);
 121         html_txt(buf.buf);
 122         strbuf_release(&buf);
 123 }
 124
 125 void html_txt(const char *txt)
 126 {
 127         const char *t = txt;
 128         while (t && *t) {
 129                 int c = *t;
 130                 if (c == '<' || c == '>' || c == '&') {
 131                         html_raw(txt, t - txt);
 132                         if (c == '>')
 133                                 html("&gt;");
 134                         else if (c == '<')
 135                                 html("&lt;");
 136                         else if (c == '&')
 137                                 html("&amp;");
 138                         txt = t + 1;
 139                 }
 140                 t++;
 141         }
 142         if (t != txt)
 143                 html(txt);
 144 }
 145
 146 void html_ntxt(int len, const char *txt)
 147 {
 148         const char *t = txt;
 149         while (t && *t && len--) {
 150                 int c = *t;
 151                 if (c == '<' || c == '>' || c == '&') {
 152                         html_raw(txt, t - txt);
 153                         if (c == '>')
 154                                 html("&gt;");
 155                         else if (c == '<')
 156                                 html("&lt;");
 157                         else if (c == '&')
 158                                 html("&amp;");
 159                         txt = t + 1;
 160                 }
 161                 t++;
 162         }
 163         if (t != txt)
 164                 html_raw(txt, t - txt);
 165         if (len < 0)
 166                 html("...");
 167 }
 168
 169 void html_attrf(const char *fmt, ...)
 170 {
 171         va_list ap;
 172         struct strbuf sb = STRBUF_INIT;
 173
 174         va_start(ap, fmt);
 175         strbuf_vaddf(&sb, fmt, ap);
 176         va_end(ap);
 177
 178         html_attr(sb.buf);
 179         strbuf_release(&sb);
 180 }
 181
 182 void html_attr(const char *txt)
 183 {
 184         const char *t = txt;
 185         while (t && *t) {
 186                 int c = *t;
 187                 if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&') {
 188                         html_raw(txt, t - txt);
 189                         if (c == '>')
 190                                 html("&gt;");
 191                         else if (c == '<')
 192                                 html("&lt;");
 193                         else if (c == '\'')
 194                                 html("&#x27;");
 195                         else if (c == '"')
 196                                 html("&quot;");
 197                         else if (c == '&')
 198                                 html("&amp;");
 199                         txt = t + 1;
 200                 }
 201                 t++;
 202         }
 203         if (t != txt)
 204                 html(txt);
 205 }
 206
 207 void html_url_path(const char *txt)
 208 {
 209         const char *t = txt;
 210         while (t && *t) {
 211                 unsigned char c = *t;
 212                 const char *e = url_escape_table[c];
 213                 if (e && c != '+' && c != '&') {
 214                         html_raw(txt, t - txt);
 215                         html(e);
 216                         txt = t + 1;
 217                 }
 218                 t++;
 219         }
 220         if (t != txt)
 221                 html(txt);
 222 }
 223
 224 void html_url_arg(const char *txt)
 225 {
 226         const char *t = txt;
 227         while (t && *t) {
 228                 unsigned char c = *t;
 229                 const char *e = url_escape_table[c];
 230                 if (c == ' ')
 231                         e = "+";
 232                 if (e) {
 233                         html_raw(txt, t - txt);
 234                         html(e);
 235                         txt = t + 1;
 236                 }
 237                 t++;
 238         }
 239         if (t != txt)
 240                 html(txt);
 241 }
 242
 243 void html_header_arg_in_quotes(const char *txt)
 244 {
 245         const char *t = txt;
 246         while (t && *t) {
 247                 unsigned char c = *t;
 248                 const char *e = NULL;
 249                 if (c == '\\')
 250                         e = "\\\\";
 251                 else if (c == '\r')
 252                         e = "\\r";
 253                 else if (c == '\n')
 254                         e = "\\n";
 255                 else if (c == '"')
 256                         e = "\\\"";
 257                 if (e) {
 258                         html_raw(txt, t - txt);
 259                         html(e);
 260                         txt = t + 1;
 261                 }
 262                 t++;
 263         }
 264         if (t != txt)
 265                 html(txt);
 266
 267 }
 268
 269 void html_hidden(const char *name, const char *value)
 270 {
 271         html("<input type='hidden' name='");
 272         html_attr(name);
 273         html("' value='");
 274         html_attr(value);
 275         html("'/>");
 276 }
 277
 278 void html_option(const char *value, const char *text, const char *selected_value)
 279 {
 280         html("<option value='");
 281         html_attr(value);
 282         html("'");
 283         if (selected_value && !strcmp(selected_value, value))
 284                 html(" selected='selected'");
 285         html(">");
 286         html_txt(text);
 287         html("</option>\n");
 288 }
 289
 290 void html_intoption(int value, const char *text, int selected_value)
 291 {
 292         htmlf("<option value='%d'%s>", value,
 293               value == selected_value ? " selected='selected'" : "");
 294         html_txt(text);
 295         html("</option>");
 296 }
 297
 298 void html_link_open(const char *url, const char *title, const char *class)
 299 {
 300         html("<a href='");
 301         html_attr(url);
 302         if (title) {
 303                 html("' title='");
 304                 html_attr(title);
 305         }
 306         if (class) {
 307                 html("' class='");
 308                 html_attr(class);
 309         }
 310         html("'>");
 311 }
 312
 313 void html_link_close(void)
 314 {
 315         html("</a>");
 316 }
 317
 318 void html_fileperm(unsigned short mode)
 319 {
 320         htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
 321               (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
 322 }
 323
 324 int html_include(const char *filename)
 325 {
 326         FILE *f;
 327         char buf[4096];
 328         size_t len;
 329
 330         if (!(f = fopen(filename, "r"))) {
 331                 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
 332                         filename, strerror(errno), errno);
 333                 return -1;
 334         }
 335         while ((len = fread(buf, 1, 4096, f)) > 0)
 336                 html_raw(buf, len);
 337         fclose(f);
 338         return 0;
 339 }
 340
 341 void http_parse_querystring(const char *txt, void (*fn)(const char *name, const char *value))
 342 {
 343         const char *t = txt;
 344
 345         while (t && *t) {
 346                 char *name = url_decode_parameter_name(&t);
 347                 if (*name) {
 348                         char *value = url_decode_parameter_value(&t);
 349                         fn(name, value);
 350                         free(value);
 351                 }
 352                 free(name);
 353         }
 354 }