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
  12 /* Percent-encoding of each character, except: a-zA-Z0-9!$()*,./:;@- */
  13 static const char* url_escape_table[256] = {
  14         "%00", "%01", "%02", "%03", "%04", "%05", "%06", "%07",
  15         "%08", "%09", "%0a", "%0b", "%0c", "%0d", "%0e", "%0f",
  16         "%10", "%11", "%12", "%13", "%14", "%15", "%16", "%17",
  17         "%18", "%19", "%1a", "%1b", "%1c", "%1d", "%1e", "%1f",
  18         "%20", NULL,  "%22", "%23", NULL,  "%25", "%26", "%27",
  19         NULL,  NULL,  NULL,  "%2b", NULL,  NULL,  NULL,  NULL,
  20         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  21         NULL,  NULL,  NULL,  NULL,  "%3c", "%3d", "%3e", "%3f",
  22         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  23         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  24         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  25         NULL,  NULL,  NULL,  NULL,  "%5c", NULL,  "%5e", NULL,
  26         "%60", NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  27         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  28         NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  29         NULL,  NULL,  NULL,  "%7b", "%7c", "%7d", NULL,  "%7f",
  30         "%80", "%81", "%82", "%83", "%84", "%85", "%86", "%87",
  31         "%88", "%89", "%8a", "%8b", "%8c", "%8d", "%8e", "%8f",
  32         "%90", "%91", "%92", "%93", "%94", "%95", "%96", "%97",
  33         "%98", "%99", "%9a", "%9b", "%9c", "%9d", "%9e", "%9f",
  34         "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%a7",
  35         "%a8", "%a9", "%aa", "%ab", "%ac", "%ad", "%ae", "%af",
  36         "%b0", "%b1", "%b2", "%b3", "%b4", "%b5", "%b6", "%b7",
  37         "%b8", "%b9", "%ba", "%bb", "%bc", "%bd", "%be", "%bf",
  38         "%c0", "%c1", "%c2", "%c3", "%c4", "%c5", "%c6", "%c7",
  39         "%c8", "%c9", "%ca", "%cb", "%cc", "%cd", "%ce", "%cf",
  40         "%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
  41         "%d8", "%d9", "%da", "%db", "%dc", "%dd", "%de", "%df",
  42         "%e0", "%e1", "%e2", "%e3", "%e4", "%e5", "%e6", "%e7",
  43         "%e8", "%e9", "%ea", "%eb", "%ec", "%ed", "%ee", "%ef",
  44         "%f0", "%f1", "%f2", "%f3", "%f4", "%f5", "%f6", "%f7",
  45         "%f8", "%f9", "%fa", "%fb", "%fc", "%fd", "%fe", "%ff"
  46 };
  47
  48 char *fmt(const char *format, ...)
  49 {
  50         static char buf[8][1024];
  51         static int bufidx;
  52         int len;
  53         va_list args;
  54
  55         bufidx++;
  56         bufidx &= 7;
  57
  58         va_start(args, format);
  59         len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);
  60         va_end(args);
  61         if (len > sizeof(buf[bufidx])) {
  62                 fprintf(stderr, "[html.c] string truncated: %s\n", format);
  63                 exit(1);
  64         }
  65         return buf[bufidx];
  66 }
  67
  68 char *fmtalloc(const char *format, ...)
  69 {
  70         struct strbuf sb = STRBUF_INIT;
  71         va_list args;
  72
  73         va_start(args, format);
  74         strbuf_vaddf(&sb, format, args);
  75         va_end(args);
  76
  77         return strbuf_detach(&sb, NULL);
  78 }
  79
  80 void html_raw(const char *data, size_t size)
  81 {
  82         if (write(STDOUT_FILENO, data, size) != size)
  83                 die_errno("write error on html output");
  84 }
  85
  86 void html(const char *txt)
  87 {
  88         html_raw(txt, strlen(txt));
  89 }
  90
  91 void htmlf(const char *format, ...)
  92 {
  93         va_list args;
  94         struct strbuf buf = STRBUF_INIT;
  95
  96         va_start(args, format);
  97         strbuf_vaddf(&buf, format, args);
  98         va_end(args);
  99         html(buf.buf);
 100         strbuf_release(&buf);
 101 }
 102
 103 void html_txtf(const char *format, ...)
 104 {
 105         va_list args;
 106
 107         va_start(args, format);
 108         html_vtxtf(format, args);
 109         va_end(args);
 110 }
 111
 112 void html_vtxtf(const char *format, va_list ap)
 113 {
 114         va_list cp;
 115         struct strbuf buf = STRBUF_INIT;
 116
 117         va_copy(cp, ap);
 118         strbuf_vaddf(&buf, format, cp);
 119         va_end(cp);
 120         html_txt(buf.buf);
 121         strbuf_release(&buf);
 122 }
 123
 124 void html_txt(const char *txt)
 125 {
 126         const char *t = txt;
 127         while (t && *t) {
 128                 int c = *t;
 129                 if (c == '<' || c == '>' || c == '&') {
 130                         html_raw(txt, t - txt);
 131                         if (c == '>')
 132                                 html("&gt;");
 133                         else if (c == '<')
 134                                 html("&lt;");
 135                         else if (c == '&')
 136                                 html("&amp;");
 137                         txt = t + 1;
 138                 }
 139                 t++;
 140         }
 141         if (t != txt)
 142                 html(txt);
 143 }
 144
 145 void html_ntxt(int len, const char *txt)
 146 {
 147         const char *t = txt;
 148         while (t && *t && len--) {
 149                 int c = *t;
 150                 if (c == '<' || c == '>' || c == '&') {
 151                         html_raw(txt, t - txt);
 152                         if (c == '>')
 153                                 html("&gt;");
 154                         else if (c == '<')
 155                                 html("&lt;");
 156                         else if (c == '&')
 157                                 html("&amp;");
 158                         txt = t + 1;
 159                 }
 160                 t++;
 161         }
 162         if (t != txt)
 163                 html_raw(txt, t - txt);
 164         if (len < 0)
 165                 html("...");
 166 }
 167
 168 void html_attrf(const char *fmt, ...)
 169 {
 170         va_list ap;
 171         struct strbuf sb = STRBUF_INIT;
 172
 173         va_start(ap, fmt);
 174         strbuf_vaddf(&sb, fmt, ap);
 175         va_end(ap);
 176
 177         html_attr(sb.buf);
 178         strbuf_release(&sb);
 179 }
 180
 181 void html_attr(const char *txt)
 182 {
 183         const char *t = txt;
 184         while (t && *t) {
 185                 int c = *t;
 186                 if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&') {
 187                         html_raw(txt, t - txt);
 188                         if (c == '>')
 189                                 html("&gt;");
 190                         else if (c == '<')
 191                                 html("&lt;");
 192                         else if (c == '\'')
 193                                 html("&#x27;");
 194                         else if (c == '"')
 195                                 html("&quot;");
 196                         else if (c == '&')
 197                                 html("&amp;");
 198                         txt = t + 1;
 199                 }
 200                 t++;
 201         }
 202         if (t != txt)
 203                 html(txt);
 204 }
 205
 206 void html_url_path(const char *txt)
 207 {
 208         const char *t = txt;
 209         while (t && *t) {
 210                 unsigned char c = *t;
 211                 const char *e = url_escape_table[c];
 212                 if (e && c != '+' && c != '&') {
 213                         html_raw(txt, t - txt);
 214                         html(e);
 215                         txt = t + 1;
 216                 }
 217                 t++;
 218         }
 219         if (t != txt)
 220                 html(txt);
 221 }
 222
 223 void html_url_arg(const char *txt)
 224 {
 225         const char *t = txt;
 226         while (t && *t) {
 227                 unsigned char c = *t;
 228                 const char *e = url_escape_table[c];
 229                 if (c == ' ')
 230                         e = "+";
 231                 if (e) {
 232                         html_raw(txt, t - txt);
 233                         html(e);
 234                         txt = t + 1;
 235                 }
 236                 t++;
 237         }
 238         if (t != txt)
 239                 html(txt);
 240 }
 241
 242 void html_header_arg_in_quotes(const char *txt)
 243 {
 244         const char *t = txt;
 245         while (t && *t) {
 246                 unsigned char c = *t;
 247                 const char *e = NULL;
 248                 if (c == '\\')
 249                         e = "\\\\";
 250                 else if (c == '\r')
 251                         e = "\\r";
 252                 else if (c == '\n')
 253                         e = "\\n";
 254                 else if (c == '"')
 255                         e = "\\\"";
 256                 if (e) {
 257                         html_raw(txt, t - txt);
 258                         html(e);
 259                         txt = t + 1;
 260                 }
 261                 t++;
 262         }
 263         if (t != txt)
 264                 html(txt);
 265
 266 }
 267
 268 void html_hidden(const char *name, const char *value)
 269 {
 270         html("<input type='hidden' name='");
 271         html_attr(name);
 272         html("' value='");
 273         html_attr(value);
 274         html("'/>");
 275 }
 276
 277 void html_option(const char *value, const char *text, const char *selected_value)
 278 {
 279         html("<option value='");
 280         html_attr(value);
 281         html("'");
 282         if (selected_value && !strcmp(selected_value, value))
 283                 html(" selected='selected'");
 284         html(">");
 285         html_txt(text);
 286         html("</option>\n");
 287 }
 288
 289 void html_intoption(int value, const char *text, int selected_value)
 290 {
 291         htmlf("<option value='%d'%s>", value,
 292               value == selected_value ? " selected='selected'" : "");
 293         html_txt(text);
 294         html("</option>");
 295 }
 296
 297 void html_link_open(const char *url, const char *title, const char *class)
 298 {
 299         html("<a href='");
 300         html_attr(url);
 301         if (title) {
 302                 html("' title='");
 303                 html_attr(title);
 304         }
 305         if (class) {
 306                 html("' class='");
 307                 html_attr(class);
 308         }
 309         html("'>");
 310 }
 311
 312 void html_link_close(void)
 313 {
 314         html("</a>");
 315 }
 316
 317 void html_fileperm(unsigned short mode)
 318 {
 319         htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
 320               (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
 321 }
 322
 323 int html_include(const char *filename)
 324 {
 325         FILE *f;
 326         char buf[4096];
 327         size_t len;
 328
 329         if (!(f = fopen(filename, "r"))) {
 330                 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
 331                         filename, strerror(errno), errno);
 332                 return -1;
 333         }
 334         while ((len = fread(buf, 1, 4096, f)) > 0)
 335                 html_raw(buf, len);
 336         fclose(f);
 337         return 0;
 338 }
 339
 340 static int hextoint(char c)
 341 {
 342         if (c >= 'a' && c <= 'f')
 343                 return 10 + c - 'a';
 344         else if (c >= 'A' && c <= 'F')
 345                 return 10 + c - 'A';
 346         else if (c >= '0' && c <= '9')
 347                 return c - '0';
 348         else
 349                 return -1;
 350 }
 351
 352 static char *convert_query_hexchar(char *txt)
 353 {
 354         int d1, d2, n;
 355         n = strlen(txt);
 356         if (n < 3) {
 357                 *txt = '\0';
 358                 return txt-1;
 359         }
 360         d1 = hextoint(*(txt + 1));
 361         d2 = hextoint(*(txt + 2));
 362         if (d1 < 0 || d2 < 0) {
 363                 memmove(txt, txt + 3, n - 2);
 364                 return txt-1;
 365         } else {
 366                 *txt = d1 * 16 + d2;
 367                 memmove(txt + 1, txt + 3, n - 2);
 368                 return txt;
 369         }
 370 }
 371
 372 int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value))
 373 {
 374         char *o, *t, *txt, *value = NULL, c;
 375
 376         if (!txt_)
 377                 return 0;
 378
 379         o = t = txt = xstrdup(txt_);
 380         while ((c=*t) != '\0') {
 381                 if (c == '=') {
 382                         *t = '\0';
 383                         value = t + 1;
 384                 } else if (c == '+') {
 385                         *t = ' ';
 386                 } else if (c == '%') {
 387                         t = convert_query_hexchar(t);
 388                 } else if (c == '&') {
 389                         *t = '\0';
 390                         (*fn)(txt, value);
 391                         txt = t + 1;
 392                         value = NULL;
 393                 }
 394                 t++;
 395         }
 396         if (t != txt)
 397                 (*fn)(txt, value);
 398         free(o);
 399         return 0;
 400 }