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