Console.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2013  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU General Public License, Version 3 {{{ */
   6 /*
   7  * Cycript is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 3 of the License,
  10  * or (at your option) any later version.
  11  *
  12  * Cycript is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with Cycript.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include "cycript.hpp"
  23
  24 #ifdef CY_EXECUTE
  25 #include "JavaScript.hpp"
  26 #endif
  27
  28 #include <cstdio>
  29 #include <sstream>
  30
  31 #include <setjmp.h>
  32
  33 #ifdef HAVE_READLINE_H
  34 #include <readline.h>
  35 #else
  36 #include <readline/readline.h>
  37 #endif
  38
  39 #ifdef HAVE_HISTORY_H
  40 #include <history.h>
  41 #else
  42 #include <readline/history.h>
  43 #endif
  44
  45 #include <sys/mman.h>
  46
  47 #include <errno.h>
  48 #include <unistd.h>
  49
  50 #include <sys/types.h>
  51 #include <sys/stat.h>
  52 #include <fcntl.h>
  53
  54 #include "Cycript.tab.hh"
  55
  56 #include <sys/types.h>
  57 #include <sys/socket.h>
  58 #include <netinet/in.h>
  59 #include <sys/un.h>
  60 #include <pwd.h>
  61
  62 #include <apr_getopt.h>
  63
  64 #include <dlfcn.h>
  65
  66 #include "Replace.hpp"
  67 #include "Display.hpp"
  68
  69 static volatile enum {
  70     Working,
  71     Parsing,
  72     Running,
  73     Sending,
  74     Waiting,
  75 } mode_;
  76
  77 static jmp_buf ctrlc_;
  78
  79 static void sigint(int) {
  80     switch (mode_) {
  81         case Working:
  82             return;
  83         case Parsing:
  84             longjmp(ctrlc_, 1);
  85         case Running:
  86             throw "*** Ctrl-C";
  87         case Sending:
  88             return;
  89         case Waiting:
  90             return;
  91     }
  92 }
  93
  94 #if YYDEBUG
  95 static bool bison_;
  96 #endif
  97 static bool strict_;
  98 static bool pretty_;
  99
 100 void Setup(CYDriver &driver, cy::parser &parser) {
 101 #if YYDEBUG
 102     if (bison_)
 103         parser.set_debug_level(1);
 104 #endif
 105     if (strict_)
 106         driver.strict_ = true;
 107 }
 108
 109 void Setup(CYOutput &out, CYDriver &driver, CYOptions &options) {
 110     out.pretty_ = pretty_;
 111     CYContext context(options);
 112     driver.program_->Replace(context);
 113 }
 114
 115 static CYUTF8String Run(CYPool &pool, int client, CYUTF8String code) {
 116     const char *json;
 117     size_t size;
 118
 119     if (client == -1) {
 120         mode_ = Running;
 121 #ifdef CY_EXECUTE
 122         json = CYExecute(pool, code);
 123 #else
 124         json = NULL;
 125 #endif
 126         mode_ = Working;
 127         if (json == NULL)
 128             size = 0;
 129         else
 130             size = strlen(json);
 131     } else {
 132         mode_ = Sending;
 133         size = code.size;
 134         CYSendAll(client, &size, sizeof(size));
 135         CYSendAll(client, code.data, code.size);
 136         mode_ = Waiting;
 137         CYRecvAll(client, &size, sizeof(size));
 138         if (size == _not(size_t))
 139             json = NULL;
 140         else {
 141             char *temp(new(pool) char[size + 1]);
 142             CYRecvAll(client, temp, size);
 143             temp[size] = '\0';
 144             json = temp;
 145         }
 146         mode_ = Working;
 147     }
 148
 149     return CYUTF8String(json, size);
 150 }
 151
 152 static CYUTF8String Run(CYPool &pool, int client, const std::string &code) {
 153     return Run(pool, client, CYUTF8String(code.c_str(), code.size()));
 154 }
 155
 156 static std::ostream *out_;
 157
 158 static void Write(bool syntax, const char *data, size_t size, std::ostream &out) {
 159     if (syntax)
 160         CYLexerHighlight(data, size, out);
 161     else
 162         out.write(data, size);
 163 }
 164
 165 static void Output(bool syntax, CYUTF8String json, std::ostream *out, bool expand = false) {
 166     const char *data(json.data);
 167     size_t size(json.size);
 168
 169     if (data == NULL || out == NULL)
 170         return;
 171
 172     if (!expand ||
 173         data[0] != '@' && data[0] != '"' && data[0] != '\'' ||
 174         data[0] == '@' && data[1] != '"' && data[1] != '\''
 175     )
 176         Write(syntax, data, size, *out);
 177     else for (size_t i(0); i != size; ++i)
 178         if (data[i] != '\\')
 179             *out << data[i];
 180         else switch(data[++i]) {
 181             case '\0': goto done;
 182             case '\\': *out << '\\'; break;
 183             case '\'': *out << '\''; break;
 184             case '"': *out << '"'; break;
 185             case 'b': *out << '\b'; break;
 186             case 'f': *out << '\f'; break;
 187             case 'n': *out << '\n'; break;
 188             case 'r': *out << '\r'; break;
 189             case 't': *out << '\t'; break;
 190             case 'v': *out << '\v'; break;
 191             default: *out << '\\'; --i; break;
 192         }
 193
 194   done:
 195     *out << std::endl;
 196 }
 197
 198 static void Run(int client, bool syntax, const char *data, size_t size, std::ostream *out = NULL, bool expand = false) {
 199     CYPool pool;
 200     Output(syntax, Run(pool, client, CYUTF8String(data, size)), out, expand);
 201 }
 202
 203 static void Run(int client, bool syntax, std::string &code, std::ostream *out = NULL, bool expand = false) {
 204     Run(client, syntax, code.c_str(), code.size(), out, expand);
 205 }
 206
 207 int (*append_history$)(int, const char *);
 208
 209 static std::string command_;
 210
 211 static CYExpression *ParseExpression(CYUTF8String code) {
 212     std::stringstream stream;
 213     stream << '(' << code << ')';
 214     CYDriver driver(stream);
 215
 216     cy::parser parser(driver);
 217     Setup(driver, parser);
 218
 219     if (parser.parse() != 0 || !driver.errors_.empty())
 220         return NULL;
 221
 222     CYOptions options;
 223     CYContext context(options);
 224
 225     // XXX: this could be replaced with a CYStatement::Primitive()
 226     if (CYExpress *express = dynamic_cast<CYExpress *>(driver.program_->statements_))
 227         return express->expression_->Primitive(context);
 228
 229     return NULL;
 230 }
 231
 232 static int client_;
 233
 234 static char **Complete(const char *word, int start, int end) {
 235     rl_attempted_completion_over = TRUE;
 236
 237     CYLocalPool pool;
 238
 239     std::string line(rl_line_buffer, start);
 240     std::istringstream stream(command_ + line);
 241     CYDriver driver(stream);
 242
 243     driver.auto_ = true;
 244
 245     cy::parser parser(driver);
 246     Setup(driver, parser);
 247
 248     if (parser.parse() != 0 || !driver.errors_.empty())
 249         return NULL;
 250
 251     if (driver.mode_ == CYDriver::AutoNone)
 252         return NULL;
 253
 254     CYExpression *expression;
 255
 256     CYOptions options;
 257     CYContext context(options);
 258
 259     std::ostringstream prefix;
 260
 261     switch (driver.mode_) {
 262         case CYDriver::AutoPrimary:
 263             expression = $ CYThis();
 264         break;
 265
 266         case CYDriver::AutoDirect:
 267             expression = driver.context_;
 268         break;
 269
 270         case CYDriver::AutoIndirect:
 271             expression = $ CYIndirect(driver.context_);
 272         break;
 273
 274         case CYDriver::AutoMessage: {
 275             CYDriver::Context &thing(driver.contexts_.back());
 276             expression = $M($C1($V("object_getClass"), thing.context_), $S("messages"));
 277             for (CYDriver::Context::Words::const_iterator part(thing.words_.begin()); part != thing.words_.end(); ++part)
 278                 prefix << (*part)->word_ << ':';
 279         } break;
 280
 281         default:
 282             _assert(false);
 283     }
 284
 285     std::string begin(prefix.str());
 286
 287     driver.program_ = $ CYProgram($ CYExpress($C3(ParseExpression(
 288     "   function(object, prefix, word) {\n"
 289     "       var names = [];\n"
 290     "       var before = prefix.length;\n"
 291     "       prefix += word;\n"
 292     "       var entire = prefix.length;\n"
 293     "       for (name in object)\n"
 294     "           if (name.substring(0, entire) == prefix)\n"
 295     "               names.push(name.substr(before));\n"
 296     "       return names;\n"
 297     "   }\n"
 298     ), expression, $S(begin.c_str()), $S(word))));
 299
 300     driver.program_->Replace(context);
 301
 302     std::ostringstream str;
 303     CYOutput out(str, options);
 304     out << *driver.program_;
 305
 306     std::string code(str.str());
 307     CYUTF8String json(Run(pool, client_, code));
 308     // XXX: if this fails we should not try to parse it
 309
 310     CYExpression *result(ParseExpression(json));
 311     if (result == NULL)
 312         return NULL;
 313
 314     CYArray *array(dynamic_cast<CYArray *>(result));
 315
 316     if (array == NULL) {
 317         *out_ << '\n';
 318         Output(false, json, out_);
 319         rl_forced_update_display();
 320         return NULL;
 321     }
 322
 323     // XXX: use an std::set?
 324     typedef std::vector<std::string> Completions;
 325     Completions completions;
 326
 327     std::string common;
 328     bool rest(false);
 329
 330     CYForEach (element, array->elements_) {
 331         CYString *string(dynamic_cast<CYString *>(element->value_));
 332         _assert(string != NULL);
 333
 334         std::string completion;
 335         if (string->size_ != 0)
 336             completion.assign(string->value_, string->size_);
 337         else if (driver.mode_ == CYDriver::AutoMessage)
 338             completion = "]";
 339         else
 340             continue;
 341
 342         completions.push_back(completion);
 343
 344         if (!rest) {
 345             common = completion;
 346             rest = true;
 347         } else {
 348             size_t limit(completion.size()), size(common.size());
 349             if (size > limit)
 350                 common = common.substr(0, limit);
 351             else
 352                 limit = size;
 353             for (limit = 0; limit != size; ++limit)
 354                 if (common[limit] != completion[limit])
 355                     break;
 356             if (limit != size)
 357                 common = common.substr(0, limit);
 358         }
 359     }
 360
 361     size_t count(completions.size());
 362     if (count == 0)
 363         return NULL;
 364
 365     size_t colon(common.find(':'));
 366     if (colon != std::string::npos)
 367         common = common.substr(0, colon + 1);
 368     if (completions.size() == 1)
 369         common += ' ';
 370
 371     char **results(reinterpret_cast<char **>(malloc(sizeof(char *) * (count + 2))));
 372
 373     results[0] = strdup(common.c_str());
 374     size_t index(0);
 375     for (Completions::const_iterator i(completions.begin()); i != completions.end(); ++i)
 376         results[++index] = strdup(i->c_str());
 377     results[count + 1] = NULL;
 378
 379     return results;
 380 }
 381
 382 // need char *, not const char *
 383 static char name_[] = "cycript";
 384 static char break_[] = " \t\n\"\\'`@$><=;|&{(" ")}" ".:[]";
 385
 386 static void Console(CYOptions &options) {
 387     CYPool pool;
 388
 389     passwd *passwd;
 390     if (const char *username = getenv("LOGNAME"))
 391         passwd = getpwnam(username);
 392     else
 393         passwd = getpwuid(getuid());
 394
 395     const char *basedir(pool.sprintf("%s/.cycript", passwd->pw_dir));
 396     const char *histfile(pool.sprintf("%s/history", basedir));
 397     size_t histlines(0);
 398
 399     rl_initialize();
 400     rl_readline_name = name_;
 401
 402     mkdir(basedir, 0700);
 403     read_history(histfile);
 404
 405     bool bypass(false);
 406     bool debug(false);
 407     bool expand(false);
 408     bool syntax(true);
 409
 410     out_ = &std::cout;
 411
 412     // rl_completer_word_break_characters is broken in libedit
 413     rl_basic_word_break_characters = break_;
 414
 415     rl_completer_word_break_characters = break_;
 416     rl_attempted_completion_function = &Complete;
 417     rl_bind_key('\t', rl_complete);
 418
 419     struct sigaction action;
 420     sigemptyset(&action.sa_mask);
 421     action.sa_handler = &sigint;
 422     action.sa_flags = 0;
 423     sigaction(SIGINT, &action, NULL);
 424
 425     restart: for (;;) {
 426         command_.clear();
 427         std::vector<std::string> lines;
 428
 429         bool extra(false);
 430         const char *prompt("cy# ");
 431
 432         if (setjmp(ctrlc_) != 0) {
 433             mode_ = Working;
 434             *out_ << std::endl;
 435             goto restart;
 436         }
 437
 438       read:
 439
 440 #if RL_READLINE_VERSION >= 0x0600
 441         if (syntax) {
 442             rl_prep_term_function = CYDisplayStart;
 443             rl_redisplay_function = CYDisplayUpdate;
 444             rl_deprep_term_function = CYDisplayFinish;
 445         } else {
 446             rl_prep_term_function = rl_prep_terminal;
 447             rl_redisplay_function = rl_redisplay;
 448             rl_deprep_term_function = rl_deprep_terminal;
 449         }
 450 #endif
 451
 452         mode_ = Parsing;
 453         char *line(readline(prompt));
 454         mode_ = Working;
 455
 456         if (line == NULL)
 457             break;
 458         if (line[0] == '\0')
 459             goto read;
 460
 461         if (!extra) {
 462             extra = true;
 463             if (line[0] == '?') {
 464                 std::string data(line + 1);
 465                 if (data == "bypass") {
 466                     bypass = !bypass;
 467                     *out_ << "bypass == " << (bypass ? "true" : "false") << std::endl;
 468                 } else if (data == "debug") {
 469                     debug = !debug;
 470                     *out_ << "debug == " << (debug ? "true" : "false") << std::endl;
 471                 } else if (data == "expand") {
 472                     expand = !expand;
 473                     *out_ << "expand == " << (expand ? "true" : "false") << std::endl;
 474                 } else if (data == "syntax") {
 475                     syntax = !syntax;
 476                     *out_ << "syntax == " << (syntax ? "true" : "false") << std::endl;
 477                 }
 478                 add_history(line);
 479                 ++histlines;
 480                 goto restart;
 481             }
 482         }
 483
 484         command_ += line;
 485
 486         char *begin(line), *end(line + strlen(line));
 487         while (char *nl = reinterpret_cast<char *>(memchr(begin, '\n', end - begin))) {
 488             *nl = '\0';
 489             lines.push_back(begin);
 490             begin = nl + 1;
 491         }
 492
 493         lines.push_back(begin);
 494
 495         free(line);
 496
 497         std::string code;
 498
 499         if (bypass)
 500             code = command_;
 501         else {
 502             CYLocalPool pool;
 503
 504             std::istringstream stream(command_);
 505             CYDriver driver(stream);
 506
 507             cy::parser parser(driver);
 508             Setup(driver, parser);
 509
 510             if (parser.parse() != 0 || !driver.errors_.empty()) {
 511                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 512                     cy::position begin(error->location_.begin);
 513                     if (begin.line != lines.size() || begin.column < lines.back().size() || error->warning_) {
 514                         cy::position end(error->location_.end);
 515
 516                         if (begin.line != lines.size()) {
 517                             std::cerr << "  | ";
 518                             std::cerr << lines[begin.line - 1] << std::endl;
 519                         }
 520
 521                         std::cerr << "....";
 522                         for (size_t i(0); i != begin.column; ++i)
 523                             std::cerr << '.';
 524                         if (begin.line != end.line || begin.column == end.column)
 525                             std::cerr << '^';
 526                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 527                             std::cerr << '^';
 528                         std::cerr << std::endl;
 529
 530                         std::cerr << "  | ";
 531                         std::cerr << error->message_ << std::endl;
 532
 533                         add_history(command_.c_str());
 534                         ++histlines;
 535                         goto restart;
 536                     }
 537                 }
 538
 539                 driver.errors_.clear();
 540
 541                 command_ += '\n';
 542                 prompt = "cy> ";
 543                 goto read;
 544             }
 545
 546             if (driver.program_ == NULL)
 547                 goto restart;
 548
 549             if (client_ != -1)
 550                 code = command_;
 551             else {
 552                 std::ostringstream str;
 553                 CYOutput out(str, options);
 554                 Setup(out, driver, options);
 555                 out << *driver.program_;
 556                 code = str.str();
 557             }
 558         }
 559
 560         add_history(command_.c_str());
 561         ++histlines;
 562
 563         if (debug) {
 564             Write(syntax, code.c_str(), code.size(), std::cout);
 565             std::cout << std::endl;
 566         }
 567
 568         Run(client_, syntax, code, out_, expand);
 569     }
 570
 571     if (append_history$ != NULL) {
 572         _syscall(close(_syscall(open(histfile, O_CREAT | O_WRONLY, 0600))));
 573         (*append_history$)(histlines, histfile);
 574     } else {
 575         write_history(histfile);
 576     }
 577
 578     *out_ << std::endl;
 579 }
 580
 581 static void *Map(const char *path, size_t *psize) {
 582     int fd;
 583     _syscall(fd = open(path, O_RDONLY));
 584
 585     struct stat stat;
 586     _syscall(fstat(fd, &stat));
 587     size_t size(stat.st_size);
 588
 589     *psize = size;
 590
 591     void *base;
 592     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 593
 594     _syscall(close(fd));
 595     return base;
 596 }
 597
 598 void InjectLibrary(pid_t pid);
 599
 600 int Main(int argc, char const * const argv[], char const * const envp[]) {
 601     bool tty(isatty(STDIN_FILENO));
 602     bool compile(false);
 603     CYOptions options;
 604
 605     append_history$ = (int (*)(int, const char *)) (dlsym(RTLD_DEFAULT, "append_history"));
 606
 607 #ifdef CY_ATTACH
 608     pid_t pid(_not(pid_t));
 609 #endif
 610
 611     CYPool pool;
 612     apr_getopt_t *state;
 613     _aprcall(apr_getopt_init(&state, pool, argc, argv));
 614
 615     for (;;) {
 616         char opt;
 617         const char *arg;
 618
 619         apr_status_t status(apr_getopt(state,
 620             "cg:n:"
 621 #ifdef CY_ATTACH
 622             "p:"
 623 #endif
 624             "s"
 625         , &opt, &arg));
 626
 627         switch (status) {
 628             case APR_EOF:
 629                 goto getopt;
 630             case APR_BADCH:
 631             case APR_BADARG:
 632                 fprintf(stderr,
 633                     "usage: cycript [-c]"
 634 #ifdef CY_ATTACH
 635                     " [-p <pid|name>]"
 636 #endif
 637                     " [<script> [<arg>...]]\n"
 638                 );
 639                 return 1;
 640             default:
 641                 _aprcall(status);
 642         }
 643
 644         switch (opt) {
 645             case 'c':
 646                 compile = true;
 647             break;
 648
 649             case 'g':
 650                 if (false);
 651                 else if (strcmp(arg, "rename") == 0)
 652                     options.verbose_ = true;
 653 #if YYDEBUG
 654                 else if (strcmp(arg, "bison") == 0)
 655                     bison_ = true;
 656 #endif
 657                 else {
 658                     fprintf(stderr, "invalid name for -g\n");
 659                     return 1;
 660                 }
 661             break;
 662
 663             case 'n':
 664                 if (false);
 665                 else if (strcmp(arg, "minify") == 0)
 666                     pretty_ = true;
 667                 else {
 668                     fprintf(stderr, "invalid name for -n\n");
 669                     return 1;
 670                 }
 671             break;
 672
 673 #ifdef CY_ATTACH
 674             case 'p': {
 675                 size_t size(strlen(arg));
 676                 char *end;
 677
 678                 pid = strtoul(arg, &end, 0);
 679                 if (arg + size != end) {
 680                     // XXX: arg needs to be escaped in some horrendous way of doom
 681                     const char *command(pool.sprintf("ps axc|sed -e '/^ *[0-9]/{s/^ *\\([0-9]*\\)\\( *[^ ]*\\)\\{3\\} *-*\\([^ ]*\\)/\\3 \\1/;/^%s /{s/^[^ ]* //;q;};};d'", arg));
 682
 683                     if (FILE *pids = popen(command, "r")) {
 684                         char value[32];
 685                         size = 0;
 686
 687                         for (;;) {
 688                             size_t read(fread(value + size, 1, sizeof(value) - size, pids));
 689                             if (read == 0)
 690                                 break;
 691                             else {
 692                                 size += read;
 693                                 if (size == sizeof(value)) {
 694                                     pid = _not(pid_t);
 695                                     goto fail;
 696                                 }
 697                             }
 698                         }
 699
 700                       size:
 701                         if (size == 0)
 702                             goto fail;
 703                         if (value[size - 1] == '\n') {
 704                             --size;
 705                             goto size;
 706                         }
 707
 708                         value[size] = '\0';
 709                         size = strlen(value);
 710                         pid = strtoul(value, &end, 0);
 711                         if (value + size != end) fail:
 712                             pid = _not(pid_t);
 713                         _syscall(pclose(pids));
 714                     }
 715
 716                     if (pid == _not(pid_t)) {
 717                         fprintf(stderr, "invalid pid for -p\n");
 718                         return 1;
 719                     }
 720                 }
 721             } break;
 722 #endif
 723
 724             case 's':
 725                 strict_ = true;
 726             break;
 727         }
 728     } getopt:;
 729
 730     const char *script;
 731     int ind(state->ind);
 732
 733 #ifdef CY_ATTACH
 734     if (pid != _not(pid_t) && ind < argc - 1) {
 735         fprintf(stderr, "-p cannot set argv\n");
 736         return 1;
 737     }
 738
 739     if (pid != _not(pid_t) && compile) {
 740         fprintf(stderr, "-p conflicts with -c\n");
 741         return 1;
 742     }
 743 #endif
 744
 745     if (ind == argc)
 746         script = NULL;
 747     else {
 748 #ifdef CY_EXECUTE
 749         // XXX: const_cast?! wtf gcc :(
 750         CYSetArgs(argc - ind - 1, const_cast<const char **>(argv + ind + 1));
 751 #endif
 752         script = argv[ind];
 753         if (strcmp(script, "-") == 0)
 754             script = NULL;
 755     }
 756
 757 #ifdef CY_ATTACH
 758     if (pid != _not(pid_t) && script == NULL && !tty) {
 759         fprintf(stderr, "non-terminal attaching to remote console\n");
 760         return 1;
 761     }
 762 #endif
 763
 764 #ifdef CY_ATTACH
 765     if (pid == _not(pid_t))
 766         client_ = -1;
 767     else {
 768         int server(_syscall(socket(PF_UNIX, SOCK_STREAM, 0))); try {
 769             struct sockaddr_un address;
 770             memset(&address, 0, sizeof(address));
 771             address.sun_family = AF_UNIX;
 772
 773             sprintf(address.sun_path, "/tmp/.s.cy.%u", getpid());
 774
 775             _syscall(bind(server, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 776             _syscall(chmod(address.sun_path, 0777));
 777
 778             try {
 779                 _syscall(listen(server, 1));
 780                 InjectLibrary(pid);
 781                 client_ = _syscall(accept(server, NULL, NULL));
 782             } catch (...) {
 783                 // XXX: exception?
 784                 unlink(address.sun_path);
 785                 throw;
 786             }
 787         } catch (...) {
 788             _syscall(close(server));
 789             throw;
 790         }
 791     }
 792 #else
 793     client_ = -1;
 794 #endif
 795
 796     if (script == NULL && tty)
 797         Console(options);
 798     else {
 799         CYLocalPool pool;
 800
 801         char *start, *end;
 802         std::istream *indirect;
 803
 804         if (script == NULL) {
 805             start = NULL;
 806             end = NULL;
 807             indirect = &std::cin;
 808         } else {
 809             size_t size;
 810             start = reinterpret_cast<char *>(Map(script, &size));
 811             end = start + size;
 812
 813             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 814                 start += 2;
 815
 816                 if (void *line = memchr(start, '\n', end - start))
 817                     start = reinterpret_cast<char *>(line);
 818                 else
 819                     start = end;
 820             }
 821
 822             indirect = NULL;
 823         }
 824
 825         CYStream direct(start, end);
 826         std::istream &stream(indirect == NULL ? direct : *indirect);
 827         CYDriver driver(stream, script ?: "<stdin>");
 828
 829         cy::parser parser(driver);
 830         Setup(driver, parser);
 831
 832         if (parser.parse() != 0 || !driver.errors_.empty()) {
 833             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 834                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 835         } else if (driver.program_ != NULL)
 836             if (client_ != -1) {
 837                 // XXX: this code means that you can't pipe to another process
 838                 std::string code(start, end-start);
 839                 Run(client_, false, code, &std::cout);
 840             } else {
 841                 std::ostringstream str;
 842                 CYOutput out(str, options);
 843                 Setup(out, driver, options);
 844                 out << *driver.program_;
 845                 std::string code(str.str());
 846                 if (compile)
 847                     std::cout << code;
 848                 else
 849                     Run(client_, false, code, &std::cout);
 850             }
 851     }
 852
 853     return 0;
 854 }
 855
 856 int main(int argc, char const * const argv[], char const * const envp[]) {
 857     apr_status_t status(apr_app_initialize(&argc, &argv, &envp));
 858
 859     if (status != APR_SUCCESS) {
 860         fprintf(stderr, "apr_app_initialize() != APR_SUCCESS\n");
 861         return 1;
 862     } else try {
 863         return Main(argc, argv, envp);
 864     } catch (const CYException &error) {
 865         CYPool pool;
 866         fprintf(stderr, "%s\n", error.PoolCString(pool));
 867         return 1;
 868     }
 869 }