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_status(int code, const char *msg, int more_headers)
 125 {
 126         htmlf("Status: %d %s\n", code, msg);
 127         if (!more_headers)
 128                 html("\n");
 129 }
 130
 131 void html_txt(const char *txt)
 132 {
 133         const char *t = txt;
 134         while (t && *t) {
 135                 int c = *t;
 136                 if (c == '<' || c == '>' || c == '&') {
 137                         html_raw(txt, t - txt);
 138                         if (c == '>')
 139                                 html("&gt;");
 140                         else if (c == '<')
 141                                 html("&lt;");
 142                         else if (c == '&')
 143                                 html("&amp;");
 144                         txt = t + 1;
 145                 }
 146                 t++;
 147         }
 148         if (t != txt)
 149                 html(txt);
 150 }
 151
 152 void html_ntxt(int len, const char *txt)
 153 {
 154         const char *t = txt;
 155         while (t && *t && len--) {
 156                 int c = *t;
 157                 if (c == '<' || c == '>' || c == '&') {
 158                         html_raw(txt, t - txt);
 159                         if (c == '>')
 160                                 html("&gt;");
 161                         else if (c == '<')
 162                                 html("&lt;");
 163                         else if (c == '&')
 164                                 html("&amp;");
 165                         txt = t + 1;
 166                 }
 167                 t++;
 168         }
 169         if (t != txt)
 170                 html_raw(txt, t - txt);
 171         if (len < 0)
 172                 html("...");
 173 }
 174
 175 void html_attrf(const char *fmt, ...)
 176 {
 177         va_list ap;
 178         struct strbuf sb = STRBUF_INIT;
 179
 180         va_start(ap, fmt);
 181         strbuf_vaddf(&sb, fmt, ap);
 182         va_end(ap);
 183
 184         html_attr(sb.buf);
 185         strbuf_release(&sb);
 186 }
 187
 188 void html_attr(const char *txt)
 189 {
 190         const char *t = txt;
 191         while (t && *t) {
 192                 int c = *t;
 193                 if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&') {
 194                         html_raw(txt, t - txt);
 195                         if (c == '>')
 196                                 html("&gt;");
 197                         else if (c == '<')
 198                                 html("&lt;");
 199                         else if (c == '\'')
 200                                 html("&#x27;");
 201                         else if (c == '"')
 202                                 html("&quot;");
 203                         else if (c == '&')
 204                                 html("&amp;");
 205                         txt = t + 1;
 206                 }
 207                 t++;
 208         }
 209         if (t != txt)
 210                 html(txt);
 211 }
 212
 213 void html_url_path(const char *txt)
 214 {
 215         const char *t = txt;
 216         while (t && *t) {
 217                 unsigned char c = *t;
 218                 const char *e = url_escape_table[c];
 219                 if (e && c != '+' && c != '&') {
 220                         html_raw(txt, t - txt);
 221                         html(e);
 222                         txt = t + 1;
 223                 }
 224                 t++;
 225         }
 226         if (t != txt)
 227                 html(txt);
 228 }
 229
 230 void html_url_arg(const char *txt)
 231 {
 232         const char *t = txt;
 233         while (t && *t) {
 234                 unsigned char c = *t;
 235                 const char *e = url_escape_table[c];
 236                 if (c == ' ')
 237                         e = "+";
 238                 if (e) {
 239                         html_raw(txt, t - txt);
 240                         html(e);
 241                         txt = t + 1;
 242                 }
 243                 t++;
 244         }
 245         if (t != txt)
 246                 html(txt);
 247 }
 248
 249 void html_hidden(const char *name, const char *value)
 250 {
 251         html("<input type='hidden' name='");
 252         html_attr(name);
 253         html("' value='");
 254         html_attr(value);
 255         html("'/>");
 256 }
 257
 258 void html_option(const char *value, const char *text, const char *selected_value)
 259 {
 260         html("<option value='");
 261         html_attr(value);
 262         html("'");
 263         if (selected_value && !strcmp(selected_value, value))
 264                 html(" selected='selected'");
 265         html(">");
 266         html_txt(text);
 267         html("</option>\n");
 268 }
 269
 270 void html_intoption(int value, const char *text, int selected_value)
 271 {
 272         htmlf("<option value='%d'%s>", value,
 273               value == selected_value ? " selected='selected'" : "");
 274         html_txt(text);
 275         html("</option>");
 276 }
 277
 278 void html_link_open(const char *url, const char *title, const char *class)
 279 {
 280         html("<a href='");
 281         html_attr(url);
 282         if (title) {
 283                 html("' title='");
 284                 html_attr(title);
 285         }
 286         if (class) {
 287                 html("' class='");
 288                 html_attr(class);
 289         }
 290         html("'>");
 291 }
 292
 293 void html_link_close(void)
 294 {
 295         html("</a>");
 296 }
 297
 298 void html_fileperm(unsigned short mode)
 299 {
 300         htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
 301               (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
 302 }
 303
 304 int html_include(const char *filename)
 305 {
 306         FILE *f;
 307         char buf[4096];
 308         size_t len;
 309
 310         if (!(f = fopen(filename, "r"))) {
 311                 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
 312                         filename, strerror(errno), errno);
 313                 return -1;
 314         }
 315         while ((len = fread(buf, 1, 4096, f)) > 0)
 316                 html_raw(buf, len);
 317         fclose(f);
 318         return 0;
 319 }
 320
 321 static int hextoint(char c)
 322 {
 323         if (c >= 'a' && c <= 'f')
 324                 return 10 + c - 'a';
 325         else if (c >= 'A' && c <= 'F')
 326                 return 10 + c - 'A';
 327         else if (c >= '0' && c <= '9')
 328                 return c - '0';
 329         else
 330                 return -1;
 331 }
 332
 333 static char *convert_query_hexchar(char *txt)
 334 {
 335         int d1, d2, n;
 336         n = strlen(txt);
 337         if (n < 3) {
 338                 *txt = '\0';
 339                 return txt-1;
 340         }
 341         d1 = hextoint(*(txt + 1));
 342         d2 = hextoint(*(txt + 2));
 343         if (d1 < 0 || d2 < 0) {
 344                 memmove(txt, txt + 3, n - 2);
 345                 return txt-1;
 346         } else {
 347                 *txt = d1 * 16 + d2;
 348                 memmove(txt + 1, txt + 3, n - 2);
 349                 return txt;
 350         }
 351 }
 352
 353 int http_parse_querystring(const char *txt_, void (*fn)(const char *name, const char *value))
 354 {
 355         char *o, *t, *txt, *value = NULL, c;
 356
 357         if (!txt_)
 358                 return 0;
 359
 360         o = t = txt = xstrdup(txt_);
 361         while ((c=*t) != '\0') {
 362                 if (c == '=') {
 363                         *t = '\0';
 364                         value = t + 1;
 365                 } else if (c == '+') {
 366                         *t = ' ';
 367                 } else if (c == '%') {
 368                         t = convert_query_hexchar(t);
 369                 } else if (c == '&') {
 370                         *t = '\0';
 371                         (*fn)(txt, value);
 372                         txt = t + 1;
 373                         value = NULL;
 374                 }
 375                 t++;
 376         }
 377         if (t != txt)
 378                 (*fn)(txt, value);
 379         free(o);
 380         return 0;
 381 }