flower/getopt-long.cc

   1 /*
   2   process command line, GNU style.
   3
   4   this is Copyleft (c) 1996--2007 Han-Wen Nienhuys, <hanwen@xs4all.nl>
   5 */
   6
   7 #include "getopt-long.hh"
   8
   9 #include <cstring>
  10 #include <cassert>
  11 #include <cstdlib>
  12
  13 #include "config.hh"
  14 #include "international.hh"
  15
  16 #if !HAVE_GETTEXT
  17 inline char *
  18 gettext (char const *s)
  19 {
  20   return (char *)s;
  21 }
  22 #else
  23 #include <libintl.h>
  24 #endif
  25
  26 long
  27 Getopt_long::get_argument_index ()
  28 {
  29   long l;
  30   if (!optional_argument_str0_
  31       || sscanf (optional_argument_str0_, "%ld", &l) != 1)
  32     report (E_ILLEGALARG);
  33
  34   return l;
  35 }
  36
  37 const Long_option_init *
  38 Getopt_long::parselong ()
  39 {
  40   char const *optnm = arg_value_char_a_a_[array_index_] + 2;
  41   assert (*optnm);
  42
  43   char const *endopt = strchr (optnm, '=');
  44   int searchlen = (endopt) ? endopt - optnm : strlen (optnm);
  45
  46   found_option_ = 0;
  47   for (int i = 0; i < table_len_; i++)
  48     {
  49       char const *ln = option_a_[i].longname_str0_;
  50
  51       if (ln && !strncmp (ln, optnm, searchlen))
  52         {
  53           found_option_ = option_a_ + i;
  54           break;
  55         }
  56     }
  57
  58   if (!found_option_)
  59     {
  60       report (E_UNKNOWNOPTION);
  61       return 0;
  62     }
  63   array_index_++;
  64   argument_index_ = 0;
  65
  66   if (found_option_->take_arg_str0_)
  67     {
  68       if (endopt)
  69         optional_argument_str0_ = endopt +1; // a '='
  70       else
  71         {
  72           optional_argument_str0_ = arg_value_char_a_a_[array_index_];
  73           array_index_++;
  74         }
  75       if (!optional_argument_str0_)
  76         report (E_ARGEXPECT);
  77     }
  78   else
  79     {
  80       optional_argument_str0_ = 0;
  81       if (endopt)
  82         report (E_NOARGEXPECT);
  83     }
  84
  85   return found_option_;
  86 }
  87
  88 string
  89 Long_option_init::to_string () const
  90 {
  91   string str;
  92   if (shortname_char_)
  93     str += "-" + shortname_char_;
  94   if (shortname_char_ && longname_str0_)
  95     str += ", ";
  96   if (longname_str0_)
  97     str += string ("`--") + longname_str0_ + "'";
  98   return str;
  99 }
 100
 101 string
 102 Long_option_init::str_for_help () const
 103 {
 104   string s;
 105   if (shortname_char_)
 106     s = "-" + ::to_string (shortname_char_);
 107   else
 108     s = "  ";
 109
 110   s = s + ((shortname_char_ && longname_str0_) ? ", " : "  ");
 111
 112   if (longname_str0_)
 113     s = s + "--" + longname_str0_;
 114
 115   if (take_arg_str0_)
 116     {
 117       if (longname_str0_)
 118         s = s + "=";
 119       else
 120         s = s + " ";
 121
 122       s = s + gettext (take_arg_str0_);
 123     }
 124   return s;
 125 }
 126
 127 // report an error, GNU style.
 128 void
 129 Getopt_long::report (Errorcod c)
 130 {
 131   error_ = c;
 132   if (!error_out_)
 133     return;
 134
 135   string str = arg_value_char_a_a_[0];
 136   str += ": ";
 137   switch (c)
 138     {
 139     case E_ARGEXPECT:
 140       str += _f ("option `%s' requires an argument",
 141                  found_option_->to_string ());
 142       break;
 143     case E_NOARGEXPECT:
 144       str += _f ("option `%s' does not allow an argument",
 145                  found_option_->to_string ());
 146       break;
 147     case E_UNKNOWNOPTION:
 148       str += _f ("unrecognized option: `%s'",
 149                  string (argument_index_
 150                              ? string ("-" + string (1, arg_value_char_a_a_[array_index_][argument_index_]))
 151                          : string (arg_value_char_a_a_[array_index_])));
 152       break;
 153     case E_ILLEGALARG:
 154       str += _f ("invalid argument `%s' to option `%s'",
 155                  optional_argument_str0_, found_option_->to_string ());
 156       break;
 157     default:
 158       assert (false);
 159     }
 160   fprintf (error_out_, "%s\n", str.c_str ());
 161   exit (2);
 162 }
 163
 164 const Long_option_init *
 165 Getopt_long::parseshort ()
 166 {
 167   char c = arg_value_char_a_a_[array_index_][argument_index_];
 168   found_option_ = 0;
 169   assert (c);
 170
 171   for (int i = 0; i < table_len_; i++)
 172     if (option_a_[i].shortname_char_ == c)
 173       {
 174         found_option_ = option_a_ + i;
 175         break;
 176       }
 177
 178   if (!found_option_)
 179     {
 180       report (E_UNKNOWNOPTION);
 181       return 0;
 182     }
 183
 184   argument_index_++;
 185   if (!found_option_->take_arg_str0_)
 186     {
 187       optional_argument_str0_ = 0;
 188       return found_option_;
 189     }
 190   optional_argument_str0_ = arg_value_char_a_a_[array_index_] + argument_index_;
 191
 192   array_index_++;
 193   argument_index_ = 0;
 194
 195   if (!optional_argument_str0_[0])
 196     {
 197       optional_argument_str0_ = arg_value_char_a_a_[array_index_];
 198       array_index_++;
 199     }
 200   if (!optional_argument_str0_)
 201     report (E_ARGEXPECT);
 202
 203   return found_option_;
 204 }
 205
 206 const Long_option_init *
 207 Getopt_long::operator () ()
 208 {
 209   if (!ok ())
 210     return 0;
 211
 212   next ();
 213   if (!ok ())
 214     return 0;
 215
 216   if (argument_index_)
 217     return parseshort ();
 218
 219   char const *argument = arg_value_char_a_a_[array_index_];
 220
 221   if (argument[0] != '-')
 222     return 0;
 223
 224   if (argument[1] == '-') {// what to do with "command  --  bla"
 225     if (argument[2])
 226       return parselong ();
 227     else
 228       return 0;
 229   }
 230   else
 231     {
 232       if (argument[ 1 ])
 233         {
 234           argument_index_ = 1;
 235           return parseshort ();
 236         }
 237       else
 238         return 0;
 239     }
 240 }
 241
 242 Getopt_long::Getopt_long (int c, char **v, Long_option_init *lo)
 243 {
 244   option_a_ = lo;
 245   error_out_ = stderr;
 246   arg_value_char_a_a_ = v;
 247   argument_count_ = c;
 248   array_index_ = 1;
 249   argument_index_ = 0;
 250
 251   //    reached end of option table?
 252   table_len_ = 0;
 253   for (int i = 0; option_a_[i].longname_str0_ || option_a_[i].shortname_char_; i++)
 254     table_len_++;
 255 }
 256
 257 bool
 258 Getopt_long::ok () const
 259 {
 260   return array_index_ < argument_count_;
 261 }
 262
 263 void
 264 Getopt_long::next ()
 265 {
 266   error_ = E_NOERROR;
 267   while (array_index_ < argument_count_
 268          && !arg_value_char_a_a_[array_index_][argument_index_])
 269     {
 270       array_index_++;
 271       argument_index_ = 0;
 272     }
 273 }
 274
 275 char const *
 276 Getopt_long::current_arg ()
 277 {
 278   if (array_index_ >= argument_count_)
 279     return 0;
 280   char const *a = arg_value_char_a_a_[array_index_];
 281   return a + argument_index_;
 282 }
 283
 284 char const *
 285 Getopt_long::get_next_arg ()
 286 {
 287   char const *a = current_arg ();
 288   if (a)
 289     {
 290       array_index_++;
 291       argument_index_ = 0;
 292     }
 293   return a;
 294 }
 295
 296 const int EXTRA_SPACES = 5;
 297
 298 string
 299 Long_option_init::table_string (Long_option_init *l)
 300 {
 301   string tabstr = "";
 302
 303   int wid = 0;
 304   for (int i = 0; l[i].shortname_char_ || l[i].longname_str0_; i++)
 305     wid = max (int(wid), int(l[i].str_for_help ().length ()));
 306
 307   for (int i = 0; l[i].shortname_char_ || l[i].longname_str0_; i++)
 308     {
 309       string s = "  " + l[i].str_for_help ();
 310       s += string (wid - s.length () + EXTRA_SPACES, ' ');
 311
 312       string help_text (gettext (l[i].help_str0_));
 313       replace_all (help_text, "\n",
 314                    "\n" + string (wid + EXTRA_SPACES + 2, ' '));
 315       tabstr += s + help_text + "\n";
 316     }
 317
 318   return tabstr;
 319 }
 320
 321 int
 322 Long_option_init::compare (Long_option_init const &a, Long_option_init const &b)
 323 {
 324   if (a.shortname_char_ && b.shortname_char_ && a.shortname_char_- b.shortname_char_)
 325     return a.shortname_char_ - b.shortname_char_;
 326
 327   if (b.shortname_char_ && a.longname_str0_)
 328     {
 329       char s[2] = {b.shortname_char_, 0};
 330       return strcmp (a.longname_str0_, s);
 331     }
 332   if (a.shortname_char_ && b.longname_str0_)
 333     {
 334       char s[2] = {a.shortname_char_, 0};
 335       return strcmp (s, b.longname_str0_);
 336     }
 337
 338   return strcmp (a.longname_str0_, b.longname_str0_);
 339 }