apt-pkg/contrib/cmndline.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cmndline.cc,v 1.15 2003/02/10 01:40:58 doogie Exp $
   4 /* ######################################################################
   5
   6    Command Line Class - Sophisticated command line parser
   7
   8    This source is placed in the Public Domain, do with it what you will
   9    It was originally written by Jason Gunthorpe <jgg@debian.org>.
  10
  11    ##################################################################### */
  12                                                                         /*}}}*/
  13 // Include files                                                        /*{{{*/
  14 #include<config.h>
  15
  16 #include <apt-pkg/configuration.h>
  17 #include <apt-pkg/cmndline.h>
  18 #include <apt-pkg/error.h>
  19 #include <apt-pkg/strutl.h>
  20
  21 #include <apti18n.h>
  22                                                                         /*}}}*/
  23 using namespace std;
  24
  25 // CommandLine::CommandLine - Constructor                               /*{{{*/
  26 // ---------------------------------------------------------------------
  27 /* */
  28 CommandLine::CommandLine(Args *AList,Configuration *Conf) : ArgList(AList),
  29                                  Conf(Conf), FileList(0)
  30 {
  31 }
  32                                                                         /*}}}*/
  33 // CommandLine::~CommandLine - Destructor                               /*{{{*/
  34 // ---------------------------------------------------------------------
  35 /* */
  36 CommandLine::~CommandLine()
  37 {
  38    delete [] FileList;
  39 }
  40                                                                         /*}}}*/
  41 // CommandLine::Parse - Main action member                              /*{{{*/
  42 // ---------------------------------------------------------------------
  43 /* */
  44 bool CommandLine::Parse(int argc,const char **argv)
  45 {
  46    delete [] FileList;
  47    FileList = new const char *[argc];
  48    const char **Files = FileList;
  49    int I;
  50    for (I = 1; I != argc; I++)
  51    {
  52       const char *Opt = argv[I];
  53
  54       // It is not an option
  55       if (*Opt != '-')
  56       {
  57          *Files++ = Opt;
  58          continue;
  59       }
  60
  61       Opt++;
  62
  63       // Double dash signifies the end of option processing
  64       if (*Opt == '-' && Opt[1] == 0)
  65       {
  66          I++;
  67          break;
  68       }
  69
  70       // Single dash is a short option
  71       if (*Opt != '-')
  72       {
  73          // Iterate over each letter
  74          while (*Opt != 0)
  75          {
  76             // Search for the option
  77             Args *A;
  78             for (A = ArgList; A->end() == false && A->ShortOpt != *Opt; A++);
  79             if (A->end() == true)
  80                return _error->Error(_("Command line option '%c' [from %s] is not known."),*Opt,argv[I]);
  81
  82             if (HandleOpt(I,argc,argv,Opt,A) == false)
  83                return false;
  84             if (*Opt != 0)
  85                Opt++;
  86          }
  87          continue;
  88       }
  89
  90       Opt++;
  91
  92       // Match up to a = against the list
  93       Args *A;
  94       const char *OptEnd = strchrnul(Opt, '=');
  95       for (A = ArgList; A->end() == false &&
  96            (A->LongOpt == 0 || stringcasecmp(Opt,OptEnd,A->LongOpt) != 0);
  97            ++A);
  98
  99       // Failed, look for a word after the first - (no-foo)
 100       bool PreceedMatch = false;
 101       if (A->end() == true)
 102       {
 103          Opt = (const char*) memchr(Opt, '-', OptEnd - Opt);
 104          if (Opt == NULL)
 105             return _error->Error(_("Command line option %s is not understood"),argv[I]);
 106          Opt++;
 107
 108          for (A = ArgList; A->end() == false &&
 109               (A->LongOpt == 0 || stringcasecmp(Opt,OptEnd,A->LongOpt) != 0);
 110               ++A);
 111
 112          // Failed again..
 113          if (A->end() == true && OptEnd - Opt != 1)
 114             return _error->Error(_("Command line option %s is not understood"),argv[I]);
 115
 116          // The option could be a single letter option prefixed by a no-..
 117          if (A->end() == true)
 118          {
 119             for (A = ArgList; A->end() == false && A->ShortOpt != *Opt; A++);
 120
 121             if (A->end() == true)
 122                return _error->Error(_("Command line option %s is not understood"),argv[I]);
 123          }
 124
 125          // The option is not boolean
 126          if (A->IsBoolean() == false)
 127             return _error->Error(_("Command line option %s is not boolean"),argv[I]);
 128          PreceedMatch = true;
 129       }
 130
 131       // Deal with it.
 132       OptEnd--;
 133       if (HandleOpt(I,argc,argv,OptEnd,A,PreceedMatch) == false)
 134          return false;
 135    }
 136
 137    // Copy any remaining file names over
 138    for (; I != argc; I++)
 139       *Files++ = argv[I];
 140    *Files = 0;
 141
 142    SaveInConfig(argc, argv);
 143
 144    return true;
 145 }
 146                                                                         /*}}}*/
 147 // CommandLine::HandleOpt - Handle a single option including all flags  /*{{{*/
 148 // ---------------------------------------------------------------------
 149 /* This is a helper function for parser, it looks at a given argument
 150    and looks for specific patterns in the string, it gets tokanized
 151    -ruffly- like -*[yes|true|enable]-(o|longopt)[=][ ][argument] */
 152 bool CommandLine::HandleOpt(int &I,int argc,const char *argv[],
 153                             const char *&Opt,Args *A,bool PreceedMatch)
 154 {
 155    const char *Argument = 0;
 156    bool CertainArg = false;
 157    int IncI = 0;
 158
 159    /* Determine the possible location of an option or 0 if their is
 160       no option */
 161    if (Opt[1] == 0 || (Opt[1] == '=' && Opt[2] == 0))
 162    {
 163       if (I + 1 < argc && argv[I+1][0] != '-')
 164          Argument = argv[I+1];
 165
 166       // Equals was specified but we fell off the end!
 167       if (Opt[1] == '=' && Argument == 0)
 168          return _error->Error(_("Option %s requires an argument."),argv[I]);
 169       if (Opt[1] == '=')
 170          CertainArg = true;
 171
 172       IncI = 1;
 173    }
 174    else
 175    {
 176       if (Opt[1] == '=')
 177       {
 178          CertainArg = true;
 179          Argument = Opt + 2;
 180       }
 181       else
 182          Argument = Opt + 1;
 183    }
 184
 185    // Option is an argument set
 186    if ((A->Flags & HasArg) == HasArg)
 187    {
 188       if (Argument == 0)
 189          return _error->Error(_("Option %s requires an argument."),argv[I]);
 190       Opt += strlen(Opt);
 191       I += IncI;
 192
 193       // Parse a configuration file
 194       if ((A->Flags & ConfigFile) == ConfigFile)
 195          return ReadConfigFile(*Conf,Argument);
 196
 197       // Arbitrary item specification
 198       if ((A->Flags & ArbItem) == ArbItem)
 199       {
 200          const char *J = strchr(Argument, '=');
 201          if (J == NULL)
 202             return _error->Error(_("Option %s: Configuration item specification must have an =<val>."),argv[I]);
 203
 204          // = is trailing
 205          if (J[1] == 0)
 206          {
 207             if (I+1 >= argc)
 208                return _error->Error(_("Option %s: Configuration item specification must have an =<val>."),argv[I]);
 209             Conf->Set(string(Argument,J-Argument),string(argv[I++ +1]));
 210          }
 211          else
 212             Conf->Set(string(Argument,J-Argument),string(J+1));
 213
 214          return true;
 215       }
 216
 217       const char *I = strchrnul(A->ConfName, ' ');
 218       if (*I == ' ')
 219          Conf->Set(string(A->ConfName,0,I-A->ConfName),string(I+1) + Argument);
 220       else
 221          Conf->Set(A->ConfName,string(I) + Argument);
 222
 223       return true;
 224    }
 225
 226    // Option is an integer level
 227    if ((A->Flags & IntLevel) == IntLevel)
 228    {
 229       // There might be an argument
 230       if (Argument != 0)
 231       {
 232          char *EndPtr;
 233          unsigned long Value = strtol(Argument,&EndPtr,10);
 234
 235          // Conversion failed and the argument was specified with an =s
 236          if (EndPtr == Argument && CertainArg == true)
 237             return _error->Error(_("Option %s requires an integer argument, not '%s'"),argv[I],Argument);
 238
 239          // Conversion was ok, set the value and return
 240          if (EndPtr != 0 && EndPtr != Argument && *EndPtr == 0)
 241          {
 242             Conf->Set(A->ConfName,Value);
 243             Opt += strlen(Opt);
 244             I += IncI;
 245             return true;
 246          }
 247       }
 248
 249       // Increase the level
 250       Conf->Set(A->ConfName,Conf->FindI(A->ConfName)+1);
 251       return true;
 252    }
 253
 254    // Option is a boolean
 255    int Sense = -1;  // -1 is unspecified, 0 is yes 1 is no
 256
 257    // Look for an argument.
 258    while (1)
 259    {
 260       // Look at preceeding text
 261       char Buffer[300];
 262       if (Argument == 0)
 263       {
 264          if (PreceedMatch == false)
 265             break;
 266
 267          if (strlen(argv[I]) >= sizeof(Buffer))
 268             return _error->Error(_("Option '%s' is too long"),argv[I]);
 269
 270          // Skip the leading dash
 271          const char *J = argv[I];
 272          for (; *J != 0 && *J == '-'; J++);
 273
 274          const char *JEnd = strchr(J, '-');
 275          if (JEnd != NULL)
 276          {
 277             strncpy(Buffer,J,JEnd - J);
 278             Buffer[JEnd - J] = 0;
 279             Argument = Buffer;
 280             CertainArg = true;
 281          }
 282          else
 283             break;
 284       }
 285
 286       // Check for boolean
 287       Sense = StringToBool(Argument);
 288       if (Sense >= 0)
 289       {
 290          // Eat the argument
 291          if (Argument != Buffer)
 292          {
 293             Opt += strlen(Opt);
 294             I += IncI;
 295          }
 296          break;
 297       }
 298
 299       if (CertainArg == true)
 300          return _error->Error(_("Sense %s is not understood, try true or false."),Argument);
 301
 302       Argument = 0;
 303    }
 304
 305    // Indeterminate sense depends on the flag
 306    if (Sense == -1)
 307    {
 308       if ((A->Flags & InvBoolean) == InvBoolean)
 309          Sense = 0;
 310       else
 311          Sense = 1;
 312    }
 313
 314    Conf->Set(A->ConfName,Sense);
 315    return true;
 316 }
 317                                                                         /*}}}*/
 318 // CommandLine::FileSize - Count the number of filenames                /*{{{*/
 319 // ---------------------------------------------------------------------
 320 /* */
 321 unsigned int CommandLine::FileSize() const
 322 {
 323    unsigned int Count = 0;
 324    for (const char **I = FileList; I != 0 && *I != 0; I++)
 325       Count++;
 326    return Count;
 327 }
 328                                                                         /*}}}*/
 329 // CommandLine::DispatchArg - Do something with the first arg           /*{{{*/
 330 // ---------------------------------------------------------------------
 331 /* */
 332 bool CommandLine::DispatchArg(Dispatch *Map,bool NoMatch)
 333 {
 334    int I;
 335    for (I = 0; Map[I].Match != 0; I++)
 336    {
 337       if (strcmp(FileList[0],Map[I].Match) == 0)
 338       {
 339          bool Res = Map[I].Handler(*this);
 340          if (Res == false && _error->PendingError() == false)
 341             _error->Error("Handler silently failed");
 342          return Res;
 343       }
 344    }
 345
 346    // No matching name
 347    if (Map[I].Match == 0)
 348    {
 349       if (NoMatch == true)
 350          _error->Error(_("Invalid operation %s"),FileList[0]);
 351    }
 352
 353    return false;
 354 }
 355                                                                         /*}}}*/
 356 // CommandLine::SaveInConfig - for output later in a logfile or so      /*{{{*/
 357 // ---------------------------------------------------------------------
 358 /* We save the commandline here to have it around later for e.g. logging.
 359    It feels a bit like a hack here and isn't bulletproof, but it is better
 360    than nothing after all. */
 361 void CommandLine::SaveInConfig(unsigned int const &argc, char const * const * const argv)
 362 {
 363    char cmdline[100 + argc * 50];
 364    unsigned int length = 0;
 365    bool lastWasOption = false;
 366    bool closeQuote = false;
 367    for (unsigned int i = 0; i < argc && length < sizeof(cmdline); ++i, ++length)
 368    {
 369       for (unsigned int j = 0; argv[i][j] != '\0' && length < sizeof(cmdline)-1; ++j, ++length)
 370       {
 371          cmdline[length] = argv[i][j];
 372          if (lastWasOption == true && argv[i][j] == '=')
 373          {
 374             // That is possibly an option: Quote it if it includes spaces,
 375             // the benefit is that this will eliminate also most false positives
 376             const char* c = strchr(&argv[i][j+1], ' ');
 377             if (c == NULL) continue;
 378             cmdline[++length] = '"';
 379             closeQuote = true;
 380          }
 381       }
 382       if (closeQuote == true)
 383          cmdline[length++] = '"';
 384       // Problem: detects also --hello
 385       if (cmdline[length-1] == 'o')
 386          lastWasOption = true;
 387       cmdline[length] = ' ';
 388    }
 389    cmdline[--length] = '\0';
 390    _config->Set("CommandLine::AsString", cmdline);
 391 }
 392                                                                         /*}}}*/