cint/ginaccint.bin.cpp

   1 /* ginaccint.bin.cpp:  Binary depends on CINTSYSDIR, better don't call it
   2  * directly.  Use the launcher (compiled from ginaccint.cpp) instead. */
   3
   4 #include "G__ci.h"   /* G__atpause is defined in G__ci.h */
   5
   6 #if (!defined(G__CINTVERSION)) || (G__CINTVERSION < 501460)
   7 #error You need at least cint 5.14.60 to compile GiNaC-cint. Download it via http from root.cern.ch/root/Cint.html or via ftp from ftpthep.physik.uni-mainz.de/pub/cint
   8 #endif // (!defined(G__CINTVERSION)) || (G__CINTVERSION < 501438)
   9
  10 #include <iostream>
  11 #include <fstream>
  12 #include <string>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include "ginac/ginac.h"
  16 #include "config.h"
  17 #include <list>
  18
  19 #ifndef NO_NAMESPACE_GINAC
  20 using namespace GiNaC;
  21 #endif // ndef NO_NAMESPACE_GINAC
  22
  23 extern "C" G__value G__exec_tempfile G__P((char *file));
  24 extern "C" void G__store_undo_position(void);
  25
  26 #define PROMPT1 "GiNaC> "
  27 #define PROMPT2 "     > "
  28
  29 #ifdef OBSCURE_CINT_HACK
  30
  31 #include <strstream>
  32
  33 template<class T>
  34 std::string ToString(const T & t)
  35 {
  36         char buf[256];
  37         ostrstream(buf,sizeof(buf)) << t << ends;
  38         return buf;
  39 }
  40
  41 basic * ex::last_created_or_assigned_bp = 0;
  42 basic * ex::dummy_bp = 0;
  43 long ex::last_created_or_assigned_exp = 0;
  44
  45 #endif // def OBSCURE_CINT_HACK
  46
  47 G__value exec_tempfile(std::string const & command);
  48 char * process_permanentfile(std::string const & command);
  49 void process_tempfile(std::string const & command);
  50 void printversionmessage(std::ostream & os);
  51 void greeting(void);
  52 void helpmessage(void);
  53 std::string preprocess(char const * const line, bool & comment, bool & single_quote,
  54                        bool & double_quote, unsigned & open_braces);
  55 void cleanup(void);
  56 void sigterm_handler(int n);
  57 void initialize(void);
  58 void initialize_cint(void);
  59 void restart(void);
  60 bool is_command(std::string const & command, std::string & preprocessed,
  61                 std::string const & comparevalue, bool substr=false);
  62 bool readlines(istream * is, std::string & allcommands);
  63 bool readfile(std::string const & filename, std::string & allcommands, bool shutup=false);
  64 void savefile(std::string const & filename, std::string const & allcommands);
  65
  66 typedef list<char *> cplist;
  67 cplist filenames;
  68 bool redirect_output = false;
  69 bool silent = false;
  70
  71 G__value exec_tempfile(std::string const & command)
  72 {
  73         G__value retval;
  74         char *tmpfilename = tempnam(NULL,"ginac");
  75         std::ofstream fout;
  76         fout.open(tmpfilename);
  77         fout << "{" << std::endl << command << std::endl << "}" << std::endl;
  78         fout.close();
  79         G__store_undo_position();
  80         retval = G__exec_tempfile(tmpfilename);
  81         G__security_recover(stdout);
  82         remove(tmpfilename);
  83         free(tmpfilename);
  84         return retval;
  85 }
  86
  87 char * process_permanentfile(std::string const & command)
  88 {
  89         char *tmpfilename = tempnam(NULL,"ginac");
  90         if (!silent)
  91                 std::cout << "creating file " << tmpfilename << std::endl;
  92         std::ofstream fout;
  93         fout.open(tmpfilename);
  94         fout << command << std::endl;
  95         fout.close();
  96         G__store_undo_position();
  97         G__loadfile(tmpfilename);
  98         G__security_recover(stdout);
  99         return tmpfilename;
 100 }
 101
 102 void process_tempfile(std::string const & command)
 103 {
 104 #ifdef OBSCURE_CINT_HACK
 105         static G__value ref_symbol = exec_tempfile("symbol ginac_cint_internal_symbol; ginac_cint_internal_symbol;");
 106         static G__value ref_constant = exec_tempfile("constant ginac_cint_internal_constant; ginac_cint_internal_constant;");
 107         static G__value ref_function = exec_tempfile("sin(ginac_cint_internal_symbol);");
 108         static G__value ref_power = exec_tempfile("power(ex(ginac_cint_internal_symbol),ex(ginac_cint_internal_symbol));");
 109         static G__value ref_numeric = exec_tempfile("numeric ginac_cint_internal_numeric; ginac_cint_internal_numeric;");
 110         static G__value ref_ex = exec_tempfile("ex ginac_cint_internal_ex; ginac_cint_internal_ex;");
 111         static bool basic_type_warning_already_displayed = false;
 112 #endif // def OBSCURE_CINT_HACK
 113
 114         G__value retval = exec_tempfile(command);
 115
 116 #ifdef OBSCURE_CINT_HACK
 117
 118         #define TYPES_EQUAL(A,B) (((A).type==(B).type) && ((A).tagnum==(B).tagnum))
 119
 120         static unsigned out_count = 0;
 121         if (TYPES_EQUAL(retval,ref_ex)) {
 122                 std::string varname = "Out"+ToString(++out_count);
 123                 if (retval.obj.i!=ex::last_created_or_assigned_exp) {
 124                         // an ex was returned, but this is not the ex which was created last
 125                         // => this is not a temporary ex, but one that resides safely in memory
 126
 127                         // std::cout << "warning: using ex from retval (experimental)" << std::endl;
 128                         ex::dummy_bp = ((ex *)(void *)(retval.obj.i))->bp;
 129                         exec_tempfile("ex "+varname+"(*ex::dummy_bp);");
 130                 } else if (ex::last_created_or_assigned_bp_can_be_converted_to_ex()) {
 131                         exec_tempfile("ex "+varname+"(*ex::last_created_or_assigned_bp);");
 132                 } else {
 133                         std::cout << "warning: last_created_or_assigned_bp modified 0 or not evaluated or not dynallocated" << std::endl;
 134                 }
 135                 exec_tempfile(std::string()+"LLLAST=LLAST;\n"
 136                               +"LLAST=LAST;\n"
 137                               +"LAST="+varname+";\n"
 138                               +"if (ginac_cint_internal_redirect_output&&"
 139                               +"    ginac_cint_internal_fout.good()) {"
 140                               +"    ginac_cint_internal_fout << \""+varname+" = \" << "+varname+" << endl << endl;"
 141                               +"} else {"
 142                               +"    std::cout << \""+varname+" = \" << "+varname+" << endl << endl;"
 143                               +"}");
 144         } else if (TYPES_EQUAL(retval,ref_symbol)||
 145                    TYPES_EQUAL(retval,ref_constant)||
 146                    TYPES_EQUAL(retval,ref_function)||
 147                    TYPES_EQUAL(retval,ref_power)||
 148                    TYPES_EQUAL(retval,ref_numeric)) {
 149                 if (!basic_type_warning_already_displayed) {
 150                         std::cout << std::endl
 151                                   <<"WARNING: The return value of the last expression you entered was a symbol," << std::endl
 152                                   << "constant, function, power or numeric, which cannot be safely displayed." << std::endl
 153                                   << "To force the output, cast it explicitly to type 'ex' or use 'cout'," << std::endl
 154                                   << "for example (assume 'x' is a symbol):" << std::endl
 155                                   << PROMPT1 "ex(x);" << std::endl
 156                                   << "OutX = x" << std::endl << std::endl
 157                                   << PROMPT1 "cout << x << endl;" << std::endl
 158                                   << "x" << std::endl << std::endl
 159                                   << "This warning will not be shown again." << std::endl;
 160                         basic_type_warning_already_displayed = true;
 161                 }
 162         }
 163 #endif // def OBSCURE_CINT_HACK
 164         return;
 165 }
 166
 167 void printversionmessage(std::ostream & os)
 168 {
 169         os << "GiNaC-cint (" << PACKAGE << " V" << VERSION
 170            << ", Cint V" << G__CINTVERSION/1000000
 171            << '.' << G__CINTVERSION/1000%1000
 172            << '.' << G__CINTVERSION%1000 << ')' << endl;
 173         return;
 174 }
 175
 176 void greeting(void)
 177 {
 178         std::cout << "Welcome to ";
 179         printversionmessage(std::cout);
 180         std::cout << "  __,  _______  GiNaC: (C) 1999-2001 Johannes Gutenberg University Mainz,\n"
 181                   << " (__) *       | Germany.  Cint C/C++ interpreter: (C) 1995-2001 Masaharu\n"
 182                   << "  ._) i N a C | Goto and Agilent Technologies, Japan.  This is free software\n"
 183                   << "<-------------' with ABSOLUTELY NO WARRANTY.  For details, type `.warranty'\n"
 184                   << "Type `.help' for help.\n\n";
 185         return;
 186 }
 187
 188 void helpmessage(void)
 189 {
 190     std::cout << "GiNaC-cint recognizes some special commands which start with a dot:\n\n"
 191                   << "  .cint                    switch to cint interactive mode (see cint\n"
 192                   << "                           documentation for further details)\n"
 193                   << "  .function                define the body of a function (necessary due to a\n"
 194                   << "                           cint limitation)\n"
 195                   << "  .help                    the text you are currently reading\n"
 196                   << "  .q, .quit, .exit, .bye   quit GiNaC-cint\n"
 197                   << "  .read filename           read a file from disk and execute it in GiNaC-cint\n"
 198                   << "                           (recursive call is possible)\n"
 199                   << "  .redirect [filename]     redirect 'OutXY = ...' output to a file\n"
 200                   << "                           (.redirect alone redirects output back to console)\n"
 201                   << "  .restart                 restart GiNaC-cint (does not re-read command line\n"
 202                   << "                           files)\n"
 203                   << "  .save filename           save the commands you have entered so far in a file\n"
 204                   << "  .silent                  suppress 'OutXY = ...' output (variables are still\n"
 205                   << "                           accessible)\n"
 206                   << "  .warranty                information on redistribution and warranty\n"
 207                   << "  .> [filename]            same as .redirect [filename]\n\n"
 208                   << "Instead of '.cmd' you can also write '//GiNaC-cint.cmd' to be compatible with\n"
 209                   << "programs that will be compiled later.\n"
 210                   << "Additionally you can exit GiNaC-cint with quit; exit; or bye;\n\n";
 211     return;
 212 }
 213
 214 void warrantymessage(void)
 215 {
 216         std::cout << "GiNaC is free software; you can redistribute it and/or modify it under the\n"
 217                   << "the terms of the GNU General Public License as published by the Free Software\n"
 218                   << "Foundation; either version 2 of the License, or (at your option) any later\n"
 219                   << "version.\n"
 220                   << "This program is distributed in the hope that it will be useful, but WITHOUT\n"
 221                   << "ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n"
 222                   << "FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n"
 223                   << "details.\n"
 224                   << "You should have received a copy of the GNU General Public License along with\n"
 225                   << "this program. If not, write to the Free Software Foundation, 675 Mass Ave,\n"
 226                   << "Cambridge, MA 02139, USA.\n\n";
 227         std::cout << "Cint and associated tools are copyright by Agilent Technologies Japan Company\n"
 228                   << "and Masaharu Goto <MXJ02154@niftyserve.or.jp>.\n"
 229                   << "Source code, binary executable or library of Cint and associated tools can be\n"
 230                   << "used, modified and distributed with no royalty for any purpose provided that\n"
 231                   << "the copyright notice appear in all copies and that both that copyright notice\n"
 232                   << "and this permission notice appear in supporting documentation.\n"
 233                   << "Agilent Technologies Japan and the author make no representations about the\n"
 234                   << "suitability of this software for any purpose.  It is provided \"AS IS\"\n"
 235                   << "without express or implied warranty.\n";
 236     return;
 237 }
 238
 239 /** "preprocess" the line entered to be able to decide if the command shall be
 240  *  executed directly or more input is needed or this is a special command.
 241  *  All whitespace will be removed.  All comments will be removed.  Open and
 242  *  close braces ( { and } ) outside strings will be counted. */
 243 std::string preprocess(char const * const line, bool & comment, bool & single_quote,
 244                        bool & double_quote, unsigned & open_braces)
 245 {
 246         std::string preprocessed;
 247         int pos = 0;
 248         bool end = false;
 249         bool escape = false;
 250         bool slash = false;
 251         bool asterisk = false;
 252         while ((line[pos]!='\0')&&!end) {
 253                 if (escape) {
 254                         // last character was a \, ignore this one
 255                         escape = false;
 256                 } else if (slash) {
 257                         // last character was a /, test if * or /
 258                         slash = false;
 259                         if (line[pos]=='/') {
 260                                 end = true;
 261                         } else if (line[pos]=='*') {
 262                                 comment = true;
 263                         } else {
 264                                 preprocessed += '/';
 265                                 preprocessed += line[pos];
 266                         }
 267                 } else if (asterisk) {
 268                         // last character was a *, test if /
 269                         asterisk = false;
 270                         if (line[pos]=='/') {
 271                                 comment = false;
 272                         } else if (line[pos]=='*') {
 273                                 preprocessed += '*';
 274                                 asterisk = true;
 275                         }
 276                 } else {
 277                         switch (line[pos]) {
 278                         case ' ':
 279                         case '\t':
 280                         case '\n':
 281                         case '\r':
 282                                 // whitespace: ignore
 283                                 break;
 284                         case '\\':
 285                                 // escape character, ignore next
 286                                 escape = true;
 287                                 break;
 288                         case '"':
 289                                 if ((!single_quote)&&(!comment)) {
 290                                         double_quote = !double_quote;
 291                                 }
 292                                 break;
 293                                 case '\'':
 294                                         if ((!double_quote)&&(!comment)) {
 295                                                 single_quote = !single_quote;
 296                                         }
 297                                         break;
 298                         case '{':
 299                                 if ((!single_quote)&&(!double_quote)&&(!comment)) {
 300                                         ++open_braces;
 301                                 }
 302                                 break;
 303                         case '}':
 304                                 if ((!single_quote)&&(!double_quote)&&(!comment)&&(open_braces>0)) {
 305                                         --open_braces;
 306                                 }
 307                                 break;
 308                         case '/':
 309                                 slash = true;
 310                                 break;
 311                         case '*':
 312                                 asterisk = true;
 313                                 break;
 314                         default:
 315                                 preprocessed += line[pos];
 316                         }
 317                 }
 318                 ++pos;
 319         }
 320
 321         return preprocessed;
 322 }
 323
 324 void cleanup(void)
 325 {
 326         for (cplist::iterator it=filenames.begin(); it!=filenames.end(); ++it) {
 327                 if (!silent)
 328                         std::cout << "removing file " << *it << std::endl;
 329                 remove(*it);
 330                 free(*it);
 331         }
 332 }
 333
 334 void sigterm_handler(int n)
 335 {
 336         G__scratch_all();
 337         exit(1);
 338 }
 339
 340 void initialize(void)
 341 {
 342         atexit(cleanup);
 343         signal(SIGTERM, sigterm_handler);
 344         initialize_cint();
 345 }
 346
 347 void initialize_cint(void)
 348 {
 349         G__init_cint("cint");    /* initialize cint */
 350
 351 #ifndef NO_NAMESPACE_GINAC
 352         exec_tempfile("using namespace GiNaC;");
 353 #endif // ndef NO_NAMESPACE_GINAC
 354
 355         exec_tempfile("ex LAST,LLAST,LLLAST;\n");
 356         exec_tempfile("bool ginac_cint_internal_redirect_output=false;\n");
 357         exec_tempfile("ofstream ginac_cint_internal_fout;\n");
 358 }
 359
 360 void restart(void)
 361 {
 362         std::cout << "Restarting GiNaC-cint." << std::endl;
 363         G__scratch_all();
 364         initialize_cint();
 365 }
 366
 367 void redirect(std::string const & filename,
 368               bool shutup=false)
 369 {
 370         if (filename=="") {
 371                 if (!shutup)
 372                         std::cout << "Redirecting output back to console..." << std::endl;
 373                 exec_tempfile(std::string()
 374                               +"ginac_cint_internal_redirect_output=false;\n"
 375                               +"ginac_cint_internal_fout.close();");
 376         } else {
 377                 if (!shutup)
 378                         std::cout << "Redirecting output to " << filename << "..." << std::endl;
 379                 exec_tempfile(std::string()
 380                               +"ginac_cint_internal_redirect_output=true;\n"
 381                               +"ginac_cint_internal_fout.open(\""+filename+"\");\n");
 382         }
 383 }
 384
 385 /** Sort out command line options and evaluate them.  Returns true if it
 386  *  succeeds and false otherwise. */
 387 bool evaloption(const std::string & option)
 388 {
 389         if (option=="--version") {
 390                 printversionmessage(std::cout);
 391                 exit(0);
 392         }
 393         if (option=="--help") {
 394                 printversionmessage(std::cout);
 395                 std::cout << "usage: ginaccint [option] [file ...]\n";
 396                 std::cout << " --help           print this help message and exit\n"
 397                           << " --silent         invoke ginaccint in silent mode\n"
 398                           << " --version        print GiNaC version and Cint version and exit\n";
 399                 exit(0);
 400         }
 401         if (option=="--silent") {
 402                 redirect("/dev/null",true);
 403                 silent = true;
 404                 return true;
 405         }
 406         return false;
 407 }
 408
 409 bool is_command(std::string const & command,
 410                 std::string & preprocessed,
 411                 std::string const & comparevalue,
 412                 bool substr)
 413 {
 414         bool single_quote = false;
 415         bool double_quote = false;
 416         bool comment = false;
 417         unsigned open_braces = 0;
 418         if ((preprocessed=="."+comparevalue)||
 419                 substr&&(preprocessed.substr(0,comparevalue.length()+1)==
 420                                  "."+comparevalue)) {
 421                 return true;
 422         }
 423         if ((command=="//GiNaC-cint."+comparevalue+"\n") ||
 424                 substr &&
 425                 (command.substr(0,comparevalue.length()+13)=="//GiNaC-cint."+comparevalue)) {
 426                 preprocessed = preprocess(command.substr(12).c_str(),comment,
 427                                           single_quote,double_quote,open_braces);
 428                 return true;
 429         }
 430         return false;
 431 }
 432
 433 bool readlines(istream * is,
 434                std::string & allcommands)
 435 {
 436         char const * line;
 437         char prompt[G__ONELINE];
 438         std::string linebuffer;
 439
 440         bool quit = false;
 441         bool eof = false;
 442         bool next_command_is_function = false;
 443         bool single_quote = false;
 444         bool double_quote = false;
 445         bool comment = false;
 446         unsigned open_braces = 0;
 447
 448         while ((!quit)&&(!eof)) {
 449                 strcpy(prompt,PROMPT1);
 450                 bool end_of_command = false;
 451                 std::string command;
 452                 std::string preprocessed;
 453                 while (!end_of_command) {
 454                         if (is==NULL) {
 455                                 line = G__input(prompt);
 456                         } else {
 457                                 getline(*is,linebuffer);
 458                                 line = linebuffer.c_str();
 459                         }
 460                         command += line;
 461                         command += "\n";
 462                         preprocessed += preprocess(line,comment,single_quote,double_quote,open_braces);
 463                         if ((open_braces==0)&&(!single_quote)&&(!double_quote)&&(!comment)) {
 464                                 unsigned l = preprocessed.length();
 465                                 if ((l==0)||
 466                                     (preprocessed[0]=='#')||
 467                                     (preprocessed[0]=='.')||
 468                                     (preprocessed[l-1]==';')||
 469                                     (preprocessed[l-1]=='}')) {
 470                                     end_of_command = true;
 471                                 }
 472                         }
 473                         strcpy(prompt,PROMPT2);
 474                 }
 475                 if ((preprocessed=="quit;")||
 476                     (preprocessed=="exit;")||
 477                     (preprocessed=="bye;")||
 478                     (is_command(command,preprocessed,"quit"))||
 479                     (is_command(command,preprocessed,"exit"))||
 480                     (is_command(command,preprocessed,"bye"))||
 481                     (is_command(command,preprocessed,"q"))) {
 482                     quit = true;
 483                 } else if (is_command(command,preprocessed,"function")) {
 484                         if (!silent)
 485                                 std::cout << "next expression can be a function definition" << std::endl;
 486                         next_command_is_function = true;
 487                 } else if (is_command(command,preprocessed,"cint")) {
 488                         std::cout << std::endl << "switching to cint interactive mode" << std::endl;
 489                         std::cout << "'h' for help, 'q' to quit, '{ statements }' or 'p [expression]' to evaluate" << std::endl;
 490                         G__pause();
 491                         std::cout << "back from cint" << std::endl;
 492                 } else if (is_command(command,preprocessed,"help")) {
 493                         helpmessage();
 494                 } else if (is_command(command,preprocessed,"read",true)) {
 495                         quit = readfile(preprocessed.substr(5),allcommands);
 496                 } else if (is_command(command,preprocessed,"save",true)) {
 497                         command = "/* "+command+" */"; // we do not want the .save command itself in saved files
 498                         savefile(preprocessed.substr(5),allcommands);
 499                 } else if (is_command(command,preprocessed,"restart")) {
 500                         restart();
 501                 } else if (is_command(command,preprocessed,"redirect",true)) {
 502                         redirect(preprocessed.substr(9));
 503                 } else if (is_command(command,preprocessed,">",true)) {
 504                         redirect(preprocessed.substr(2));
 505                 } else if (is_command(command,preprocessed,"silent")) {
 506                         if (!silent) {
 507                                 redirect("/dev/null");
 508                                 silent = true;
 509                         } else {
 510                                 redirect("");
 511                                 silent = false;
 512                         }
 513                 } else if (is_command(command,preprocessed,"warranty")) {
 514                         warrantymessage();
 515                 /* insert tests for more special commands here */
 516                 } else if (command.substr(0,2)=="#!") {
 517                         // ignore lines which indicate that this file is executed as a script
 518                 } else {
 519                         // std::cout << "now processing: " << command << std::endl;
 520                         if (next_command_is_function) {
 521                                 next_command_is_function = false;
 522                                 filenames.push_back(process_permanentfile(command));
 523                         } else {
 524                                 process_tempfile(command);
 525                         }
 526                 }
 527                 if (is!=NULL) {
 528                         // test for end of file if reading from a stream
 529                         eof = is->eof();
 530                 } else {
 531                         // save commands only when reading from keyboard
 532                         allcommands += command;
 533                 }
 534
 535         }
 536         return quit;
 537 }
 538
 539 bool readfile(std::string const & filename,
 540               std::string & allcommands,
 541               bool shutup = false)
 542 {
 543         if (!shutup)
 544                 std::cout << "Reading commands from file " << filename << "." << std::endl;
 545         bool quit = false;
 546         std::ifstream fin;
 547         fin.open(filename.c_str());
 548         if (fin.good())
 549                 quit = readlines(&fin,allcommands);
 550         else
 551                 std::cout << "Cannot open " << filename << " for reading." << std::endl;
 552         fin.close();
 553         return quit;
 554 }
 555
 556 void savefile(std::string const & filename, std::string const & allcommands)
 557 {
 558         std::cout << "Saving commands to file " << filename << "." << std::endl;
 559         std::ofstream fout;
 560         fout.open(filename.c_str());
 561         if (fout.good()) {
 562                 fout << allcommands;
 563                 if (!fout.good()) {
 564                         std::cout << "Cannot save commands to " << filename << "." << std::endl;
 565                 }
 566         } else {
 567                 std::cout << "Cannot open " << filename << " for writing." << std::endl;
 568         }
 569         fout.close();
 570 }
 571
 572 int main(int argc, char * *argv)
 573 {
 574         std::string allcommands;
 575         initialize();
 576
 577         bool quit = false;
 578         // sort out and evaluate recognized options from the argument list
 579         for (int i=1; i<argc; ++i)
 580                 if (evaloption(argv[i])) {
 581                         for (int j=i; j<argc-1; ++j)
 582                                 argv[j] = argv[j+1];
 583                         --argc;
 584                 }
 585         bool argsexist = argc>1;
 586
 587         // greet the user if it makes sense
 588         if (isatty(0) && !silent)
 589                 greeting();
 590
 591         // evaluate files given as command line arguments
 592         if (argsexist) {
 593                 allcommands = "/* Files given as command line arguments:\n";
 594                 --argc;
 595                 while (argc && !quit) {
 596                         allcommands += std::string(argv[argc])+'\n';
 597                         quit = readfile(argv[argc], allcommands, silent);
 598                         --argc;
 599                 }
 600                 allcommands += "*/\n";
 601         }
 602
 603         // evaluate input from command line or script
 604         if (!quit)
 605                 readlines(NULL, allcommands);
 606
 607         return 0;
 608 }