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         if (txt)
 128                 html_ntxt(txt, strlen(txt));
 129 }
 130
 131 ssize_t html_ntxt(const char *txt, size_t len)
 132 {
 133         const char *t = txt;
 134         ssize_t slen;
 135
 136         if (len > SSIZE_MAX)
 137                 return -1;
 138
 139         slen = (ssize_t) len;
 140         while (t && *t && slen--) {
 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_raw(txt, t - txt);
 156         return slen;
 157 }
 158
 159 void html_attrf(const char *fmt, ...)
 160 {
 161         va_list ap;
 162         struct strbuf sb = STRBUF_INIT;
 163
 164         va_start(ap, fmt);
 165         strbuf_vaddf(&sb, fmt, ap);
 166         va_end(ap);
 167
 168         html_attr(sb.buf);
 169         strbuf_release(&sb);
 170 }
 171
 172 void html_attr(const char *txt)
 173 {
 174         const char *t = txt;
 175         while (t && *t) {
 176                 int c = *t;
 177                 if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&') {
 178                         html_raw(txt, t - txt);
 179                         if (c == '>')
 180                                 html("&gt;");
 181                         else if (c == '<')
 182                                 html("&lt;");
 183                         else if (c == '\'')
 184                                 html("&#x27;");
 185                         else if (c == '"')
 186                                 html("&quot;");
 187                         else if (c == '&')
 188                                 html("&amp;");
 189                         txt = t + 1;
 190                 }
 191                 t++;
 192         }
 193         if (t != txt)
 194                 html(txt);
 195 }
 196
 197 void html_url_path(const char *txt)
 198 {
 199         const char *t = txt;
 200         while (t && *t) {
 201                 unsigned char c = *t;
 202                 const char *e = url_escape_table[c];
 203                 if (e && c != '+' && c != '&') {
 204                         html_raw(txt, t - txt);
 205                         html(e);
 206                         txt = t + 1;
 207                 }
 208                 t++;
 209         }
 210         if (t != txt)
 211                 html(txt);
 212 }
 213
 214 void html_url_arg(const char *txt)
 215 {
 216         const char *t = txt;
 217         while (t && *t) {
 218                 unsigned char c = *t;
 219                 const char *e = url_escape_table[c];
 220                 if (c == ' ')
 221                         e = "+";
 222                 if (e) {
 223                         html_raw(txt, t - txt);
 224                         html(e);
 225                         txt = t + 1;
 226                 }
 227                 t++;
 228         }
 229         if (t != txt)
 230                 html(txt);
 231 }
 232
 233 void html_header_arg_in_quotes(const char *txt)
 234 {
 235         const char *t = txt;
 236         while (t && *t) {
 237                 unsigned char c = *t;
 238                 const char *e = NULL;
 239                 if (c == '\\')
 240                         e = "\\\\";
 241                 else if (c == '\r')
 242                         e = "\\r";
 243                 else if (c == '\n')
 244                         e = "\\n";
 245                 else if (c == '"')
 246                         e = "\\\"";
 247                 if (e) {
 248                         html_raw(txt, t - txt);
 249                         html(e);
 250                         txt = t + 1;
 251                 }
 252                 t++;
 253         }
 254         if (t != txt)
 255                 html(txt);
 256
 257 }
 258
 259 void html_hidden(const char *name, const char *value)
 260 {
 261         html("<input type='hidden' name='");
 262         html_attr(name);
 263         html("' value='");
 264         html_attr(value);
 265         html("'/>");
 266 }
 267
 268 void html_option(const char *value, const char *text, const char *selected_value)
 269 {
 270         html("<option value='");
 271         html_attr(value);
 272         html("'");
 273         if (selected_value && !strcmp(selected_value, value))
 274                 html(" selected='selected'");
 275         html(">");
 276         html_txt(text);
 277         html("</option>\n");
 278 }
 279
 280 void html_intoption(int value, const char *text, int selected_value)
 281 {
 282         htmlf("<option value='%d'%s>", value,
 283               value == selected_value ? " selected='selected'" : "");
 284         html_txt(text);
 285         html("</option>");
 286 }
 287
 288 void html_link_open(const char *url, const char *title, const char *class)
 289 {
 290         html("<a href='");
 291         html_attr(url);
 292         if (title) {
 293                 html("' title='");
 294                 html_attr(title);
 295         }
 296         if (class) {
 297                 html("' class='");
 298                 html_attr(class);
 299         }
 300         html("'>");
 301 }
 302
 303 void html_link_close(void)
 304 {
 305         html("</a>");
 306 }
 307
 308 void html_fileperm(unsigned short mode)
 309 {
 310         htmlf("%c%c%c", (mode & 4 ? 'r' : '-'),
 311               (mode & 2 ? 'w' : '-'), (mode & 1 ? 'x' : '-'));
 312 }
 313
 314 int html_include(const char *filename)
 315 {
 316         FILE *f;
 317         char buf[4096];
 318         size_t len;
 319
 320         if (!(f = fopen(filename, "r"))) {
 321                 fprintf(stderr, "[cgit] Failed to include file %s: %s (%d).\n",
 322                         filename, strerror(errno), errno);
 323                 return -1;
 324         }
 325         while ((len = fread(buf, 1, 4096, f)) > 0)
 326                 html_raw(buf, len);
 327         fclose(f);
 328         return 0;
 329 }
 330
 331 void http_parse_querystring(const char *txt, void (*fn)(const char *name, const char *value))
 332 {
 333         const char *t = txt;
 334
 335         while (t && *t) {
 336                 char *name = url_decode_parameter_name(&t);
 337                 if (*name) {
 338                         char *value = url_decode_parameter_value(&t);
 339                         fn(name, value);
 340                         free(value);
 341                 }
 342                 free(name);
 343         }
 344 }