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