/*
  command-line.cpp

  Qore Programming Language

  this whole file comes out of a very old getopt-stype implementation

  it should offer POSIX style command-line handling on any platform...

  Copyright (C) 2003 - 2018 Qore Technologies, s.r.o.

  Permission is hereby granted, free of charge, to any person obtaining a
  copy of this software and associated documentation files (the "Software"),
  to deal in the Software without restriction, including without limitation
  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  and/or sell copies of the Software, and to permit persons to whom the
  Software is furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  DEALINGS IN THE SOFTWARE.

  Note that the Qore library is released under a choice of three open-source
  licenses: MIT (as above), LGPL 2+, or GPL 2+; see README-LICENSE for more
  information.
*/

#include <qore/Qore.h>
#include <qore/ParseOptionMap.h>
#include <qore/safe_dslist>

#include "command-line.h"

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <libgen.h>
#include <ctype.h>
#include <strings.h>

#include <string>
#include <map>

#define is_assign_char(a) ((((a) == '=') || ((a) == ':')))

// license type for initializing the library
static qore_license_t license = QL_GPL;

// list of modules to load after library initialization
typedef safe_dslist<std::string> cl_mod_list_t;
static cl_mod_list_t cl_mod_list;

// global parse_option
static int64 parse_options = PO_DEFAULT;
static int warnings = QP_WARN_DEFAULT;
static int qore_lib_options = QLO_NONE;

// lock options
static bool lock_options = false;

// command-line specified default character set
static const char* def_charset = 0;

// classname to instantiate as program
static const char* exec_class_name = 0;

// time zone to set after initialization
const char* cmd_zone = 0;

// show module errors
static bool show_mod_errs = false;

// execute class
static bool exec_class = false;

// treat warnings as errors
static bool warnings_are_errors = false;

// stop writing parse exceptions after 1st one
static bool only_first_except = false;

// program text given on the command-line
static const char* cl_pgm = 0;

// argument to evaluate given on the command-line
static const char* eval_arg = 0;

// program name
static char* pn;

// define map type
typedef std::map<std::string, std::string> defmap_t;

// parse define map
static defmap_t defmap;

static int opt_errors = 0;

static const char usage[] = "usage: %s [option(s)]... [program file]\n";
static const char suggest[] = "try '%s -h' for more information.\n";

static const char helpstr[] =
   "  -a, --show-aliases           displays the list of character sets aliases\n"
   "  -b, --disable-signals        disables signal handling\n"
   "  -B, --show-build-options     show Qore build options and quit\n"
   "  -c, --charset=arg            sets default character set encoding\n"
   "  -D, --define=arg             sets the value of a parse define\n"
   "  -e, --exec=arg               execute program given on command-line\n"
   "  -g, --disable-gc             disable the garbage collector\n"
   "  -h, --help                   shows this help text and exit\n"
   "  -i, --list-warnings          list all warnings and quit\n"
   "  -l, --load=arg               load module 'arg' immediately\n"
   "      --lgpl,--mit             sets the library's license flag to LGPL or\n"
   "                               MIT; GPL modules cannot be loaded\n"
   "  -m, --show-module-errors     shows error messages related to loading and\n"
   "                               initializing qore modules\n"
   "      --module-dir             show qore binary module directory and exit\n"
   "      --user-module-dir        show qore user module directory and exit\n"
   "      --module-path            show qore module search path and exit\n"
   "      --module-api             show compatible qore module API version and\n"
   "                               exit\n"
   "      --module-apis            show all qore module API versions\n"
   "      --latest-module-api      show most recent module API version and exit\n"
   "  -o, --list-parse-options     list all parse options\n"
   "  -p, --set-parse-option=arg   set parse option (ex: -pno-database)\n"
   "  -r, --warnings-are-errors    treat warnings as errors\n"
   "      --only-first-exception   don't write all parsing exceptions\n"
   "                               stop after 1st one\n"
   "  -s, --show-charsets          displays known character encodings\n"
   "  -V, --version                show program version information and quit\n"
   "      --short-version          show short version information and quit\n"
   "  -W, --enable-all-warnings    turn on all warnings (recommended)\n"
   "  -w, --enable-warning=arg     turn on warning given by argument\n"
   "  -x, --exec-class[=arg]       instantiate class with same name as file name\n"
   "                               (override with arg, also sets --no-top-level)\n"
   "  -X, --eval=arg               evaluates argument and displays result\n"
   "  -z, --time-zone=arg          sets the time zone from the argument; can be\n"
   "                               either a region name (ex: 'Europe/Prague') or a\n"
   "                               UTC offset with format S[DD[:DD[:DD]]], S=+ or -\n"
   "\n"
   " PARSE OPTIONS:\n"
   "  -H, --parse-option-help      display options controlling parse options";

static const char parseopts[] =    "qore options controlling parse options:\n"
   "  -o, --list-parse-options     list all parse options\n"
   "  -p, --set-parse-option=arg   set parse option (ex: -pno-database)\n"
   "\n PARSE OPTIONS:\n"
   "  -A, --lock-warnings          do not allow changes in warning levels\n"
   "      --lockdown               only allow single-threaded code execution with\n"
   "                               no external access or terminal or GUI I/O\n"
   "      --allow-bare-refs        allow refs to vars without '$' and refs to\n"
   "                               class members without '$.'\n"
   "      --assume-local           assume local scope for variables declared\n"
   "                               without 'my' or 'our'\n"
   "      --no-class-defs          make class definitions illegal\n"
   "      --no-database            disallow access to database functionality\n"
   "      --no-external-access     disallow all external access (filesystem,\n"
   "                               network, external processes, etc)\n"
   "      --no-external-info       disallow access to external info\n"
   "  -E, --no-external-process    make access to external processes illegal\n"
   "  -F, --no-filesystem          disallow access to the local filesystem\n"
   "  -G, --no-global-vars         make global variable definitions illegal\n"
   "      --no-gui                 do not allow access to GUI functionality\n"
   "      --no-io                  do not allow any I/O of any sort,\n"
   "  -I, --no-child-restrictions  do not restrict subprograms' parse options\n"
   "      --no-constant-defs       make constant definitions illegal\n"
   "  -K, --lock-options           disable changes to parse options in program\n"
   "  -L, --no-top-level           make top-level statements illegal\n"
   "  -M, --no-namespace-defs      make namespace declarations illegal\n"
   "  -N, --no-new                 make using the 'new' operator illegal\n"
   "  -n, --new-style              turns on 'allow-bare-refs' and 'assume-local'\n"
   "                               for programming style more similar to C++/Java\n"
   "  -O, --require-our            require 'our' with global vars (recommended)\n"
   "      --require-types          require type declarations\n"
   "      --require-prototypes     require type declarations in method and function\n"
   "                               signatures\n"
   "      --no-locale-control      make locale control illegal (time zone, etc)\n"
   "  -P, --no-process-control     make process control illegal (fork(), exit(),\n"
   "                               etc)\n"
   "      --strict-args            do not ignore type errors or excess args in\n"
   "                               function and method calls\n"
   "      --no-terminal-io         do not allow access to the text terminal\n"
   "  -R, --no-thread-control      make thread control operations illegal\n"
   "      --no-thread-info         disallow access to thread info\n"
   "  -S, --no-subroutine-defs     make subroutine definitions illegal\n"
   "  -T, --no-threads             disallow thread access and control\n"
   "      --no-thread-classes      disallow access to thread classes\n"
   "  -Y, --no-network             disallow access to the network";
////12345678901234567890123456789012345678901234567890123456789012345678901234567890
static const char debugstr[] = "\n DEBUGGING OPTIONS:\n"
   "  -d, --debug=arg              sets debugging level (higher number = more output)\n"
   "  -t, --trace                  turns on function tracing"
   ;

static inline void show_usage() {
   printf(usage, pn);
}

static void show_parse_option_help(const char* arg) {
   printf("%s\n", parseopts);
   exit(0);
}

static void do_debug(const char* arg) {
   debug = atoi(arg);
}

static void set_eval_arg(const char* arg) {
   eval_arg = arg;
}

static void do_trace(const char* arg) {
   qore_trace = 1;
}

static void show_module_path(const char* arg) {
   printf("%s:%s:%s:%s\n", qore_user_module_ver_dir, qore_user_module_dir, qore_module_ver_dir, qore_module_dir);
   exit(0);
}

static void show_binary_module_dir(const char* arg) {
   printf("%s\n", qore_module_dir);
   exit(0);
}

static void show_user_module_dir(const char* arg) {
   printf("%s\n", qore_user_module_dir);
   exit(0);
}

static void show_module_api(const char* arg) {
   printf("%d.%d\n", qore_min_mod_api_major, qore_min_mod_api_minor);
   exit(0);
}

static void show_module_apis(const char* arg) {
   // show all module apis
   printf("%d.%d", qore_mod_api_list[0].major, qore_mod_api_list[0].minor);
   for (unsigned i = 1; i < qore_mod_api_list_len; ++i)
      printf(", %d.%d", qore_mod_api_list[i].major, qore_mod_api_list[i].minor);
   printf("\n");

   exit(0);
}

static void show_latest_module_api(const char* arg) {
   printf("%d.%d\n", qore_mod_api_list[0].major, qore_mod_api_list[0].minor);
   exit(0);
}

static void set_parse_option(const char* arg) {
   int64 code = ParseOptionMap::find_code64(arg);
   if (code == -1) {
      fprintf(stderr, "unknown parse option '%s', use -o or --list-parse-options\n", arg);
      exit(1);
   }
   parse_options |= code;
}

static void only_first_exception(const char* arg) {
   only_first_except = true;
}

static void list_parse_options(const char* arg) {
   ParseOptionMap::list_options();
   exit(0);
}

static void do_help(const char* arg) {
   show_usage();
   puts(helpstr);
   if (qore_has_debug())
      puts(debugstr);
   exit(0);
}

static void disable_signals(const char* arg) {
   qore_lib_options |= QLO_DISABLE_SIGNAL_HANDLING;
}

static void load_module(const char* arg) {
   cl_mod_list.push_back(arg);
}

static void warn_to_err(const char* arg) {
   warnings_are_errors = true;
}

static void enable_warnings(const char* arg) {
   warnings = -1;
}

static void enable_warning(const char* arg) {
   int code = get_warning_code(arg);
   if (!code) {
      printf("cannot enable unknown warning '%s'\n", arg);
      exit(1);
   }
   warnings |= code;
}

static void list_warnings(const char* arg) {
   for (unsigned i = 0; i < qore_num_warnings; i++)
      printf("%s\n", qore_warnings[i]);
   exit(0);
}

static void do_no_terminal_io(const char* arg) {
   parse_options |= PO_NO_TERMINAL_IO;
}

static void do_no_io(const char* arg) {
   parse_options |= PO_NO_IO;
}

static void do_no_gui(const char* arg) {
   parse_options |= PO_NO_GUI;
}

static void do_no_database(const char* arg) {
   parse_options |= PO_NO_DATABASE;
}

static void do_lockdown(const char* arg) {
   parse_options |= PO_LOCKDOWN;
}

static void do_lock_warnings(const char* arg) {
   parse_options |= PO_LOCK_WARNINGS;
}

static void do_no_global_vars(const char* arg) {
   parse_options |= PO_NO_GLOBAL_VARS;
}

static void do_no_subroutine_defs(const char* arg) {
   parse_options |= PO_NO_SUBROUTINE_DEFS;
}

static void do_no_network(const char* arg) {
   parse_options |= PO_NO_NETWORK;
}

static void do_no_threads(const char* arg) {
   parse_options |= PO_NO_THREADS;
}

static void do_no_thread_control(const char* arg) {
   parse_options |= PO_NO_THREAD_CONTROL;
}

static void do_no_thread_classes(const char* arg) {
   parse_options |= PO_NO_THREAD_CLASSES;
}

static void do_no_top_level(const char* arg) {
   parse_options |= PO_NO_TOP_LEVEL_STATEMENTS;
}

static void do_no_class_defs(const char* arg) {
   parse_options |= PO_NO_CLASS_DEFS;
}

static void do_no_namespace_defs(const char* arg) {
   parse_options |= PO_NO_NAMESPACE_DEFS;
}

static void do_no_constant_defs(const char* arg) {
   parse_options |= PO_NO_CONSTANT_DEFS;
}

static void do_no_filesystem(const char* arg) {
   parse_options |= PO_NO_FILESYSTEM;
}

static void do_no_new(const char* arg) {
   parse_options |= PO_NO_NEW;
}

static void do_no_child_po_restrictions(const char* arg) {
   parse_options |= PO_NO_CHILD_PO_RESTRICTIONS;
}

static void do_no_external_access(const char* arg) {
   parse_options |= PO_NO_EXTERNAL_ACCESS;
}

static void do_no_external_info(const char* arg) {
   parse_options |= PO_NO_EXTERNAL_INFO;
}

static void do_no_external_process(const char* arg) {
   parse_options |= PO_NO_EXTERNAL_PROCESS;
}

static void do_no_locale_control(const char* arg) {
   parse_options |= PO_NO_LOCALE_CONTROL;
}

static void do_no_process_control(const char* arg) {
   parse_options |= PO_NO_PROCESS_CONTROL;
}

static void do_no_thread_info(const char* arg) {
   parse_options |= PO_NO_THREAD_INFO;
}

static void do_require_our(const char* arg) {
   parse_options |= PO_REQUIRE_OUR;
}

static void do_require_types(const char* arg) {
   parse_options |= PO_REQUIRE_TYPES;
}

static void do_require_prototypes(const char* arg) {
   parse_options |= PO_REQUIRE_PROTOTYPES;
}

static void do_strict_args(const char* arg) {
   parse_options |= PO_STRICT_ARGS;
}

static void do_lock_options(const char* arg) {
   lock_options = true;
}

static void allow_bare_refs(const char* arg) {
   parse_options |= PO_ALLOW_BARE_REFS;
}

static void assume_local(const char* arg) {
   parse_options |= PO_ASSUME_LOCAL;
}

static void new_style(const char* arg) {
   parse_options |= PO_NEW_STYLE;
}

static void short_version(const char* arg) {
   printf("%s\n", qore_version_string);
   exit(0);
}

static void set_time_zone(const char* arg) {
   cmd_zone = arg;
}

static void set_define(const char* carg) {
   QoreString str(carg);
   // trim trailing and leading whitespace
   str.trim();
   // find assignment character, if any
   const char* p = strchr(str.getBuffer(), '=');
   QoreString arg;
   if (p) {
      // copy arg to arg string
      arg.set(p + 1);
      // trim leading whitespace, if any
      arg.trim_leading();
      // remove argument from define string
      str.terminate(p - str.getBuffer());
   }
   // check define string
   if (str.empty()) {
      fprintf(stderr, "missing argument for --define\n");
      exit(1);
   }

   if (defmap.find(str.getBuffer()) != defmap.end()) {
      fprintf(stderr, "more than one definition for parse define '%s' given\n", str.getBuffer());
      exit(1);
   }

   defmap[str.getBuffer()] = arg.getBuffer();
}

static const char* tlist[] = { "OPTION", "ALGORITHM", "FUNCTION", "UNKNOWN" };

static void show_build_options(const char* arg) {
   printf("this build has options:\n");
   // find longest option name
   int len = 0;
   for (size_t j = 0; j < qore_option_list_size; ++j) {
      int ilen = strlen(qore_option_list[j].option);
      if (ilen > len)
         len = ilen;
   }
   // create format string
   QoreString fmt(" %9s %-");
   fmt.sprintf("%d", len + 1);
   fmt.concat("s = %s\n");

   for (unsigned j = 0; j < qore_option_list_size; ++j) {
      int type = qore_option_list[j].type;
      if (type > QO_FUNCTION)
         type = QO_FUNCTION + 1;
      printf(fmt.getBuffer(), tlist[type], qore_option_list[j].option,
             qore_option_list[j].value ? "true" : "false");
   }
   exit(0);
}

static void do_version(const char* arg) {
   printf("QORE for %s %s (%d-bit build), Copyright (C) 2003 - 2018 David Nichols\n", qore_target_os, qore_target_arch, qore_target_bits);

   printf("version %s", qore_version_string);
   FeatureList::iterator i = qoreFeatureList.begin();
   if (i != qoreFeatureList.end()) {
      printf(" (builtin features: ");
      while (i != qoreFeatureList.end()) {
	 fputs((*i).c_str(), stdout);
	 i++;
	 if (i != qoreFeatureList.end())
	    printf(", ");
      }
      putchar(')');
   }

   // show git hash
   printf("\n  git hash: %s", qore_git_hash);

   // show module api and compatible module apis
   printf("\n  module API: %d.%d", qore_mod_api_list[0].major, qore_mod_api_list[0].minor);
   if (qore_mod_api_list_len == 1)
       printf("\n");
   else {
       printf(" (");
       for (unsigned j = 1; j < qore_mod_api_list_len; ++j) {
	   printf("%d.%d", qore_mod_api_list[j].major, qore_mod_api_list[j].minor);
	   if (j != (qore_mod_api_list_len - 1))
	       printf(", ");
       }
       printf(")\n");
   }

   printf("  build host: %s\n  C++ compiler: %s\n  CFLAGS: %s\n  LDFLAGS: %s\n  MPFR: %s\n",
	  qore_build_host, qore_cplusplus_compiler, qore_cflags, qore_ldflags, mpfrInfo.getBuffer());

   printf("use -B to show build options\n");

   exit(0);
}

static void set_charset(const char* arg) {
   def_charset = arg;
}

static void show_charsets(const char* arg) {
   QEM.showEncodings();
   exit(0);
}

static void show_charset_aliases(const char* arg) {
   QEM.showAliases();
   exit(0);
}

static void set_exec(const char* arg) {
   cl_pgm = arg;
}

static void disable_gc(const char* arg) {
   qore_lib_options |= QLO_DISABLE_GARBAGE_COLLECTION;
}

static void show_module_errors(const char* arg) {
   show_mod_errs = true;
}

static void do_exec_class(const char* arg) {
   //printf("do_exec_class(%s)\n", arg);
   exec_class = true;
   exec_class_name = arg;
   parse_options |= PO_NO_TOP_LEVEL_STATEMENTS;
}

static void set_lgpl(const char* arg) {
   license = QL_LGPL;
}

static void set_mit(const char* arg) {
   license = QL_MIT;
}

#define ARG_NONE 0
#define ARG_MAND 1
#define ARG_OPT  2

static struct opt_struct_s {
      char short_opt;
      const char* long_opt;
      int arg;
      void (*opt_func)(const char* arg);
} options[] = {
   { 'a', "show-aliases",          ARG_NONE, show_charset_aliases },
   { 'B', "show-built-options",    ARG_NONE, show_build_options },
   { 'c', "charset",               ARG_MAND, set_charset },
   { 'e', "exec",                  ARG_MAND, set_exec },
   { 'g', "disable-gc",            ARG_NONE, disable_gc },
   { 'h', "help",                  ARG_NONE, do_help },
   { 'i', "list-warnings",         ARG_NONE, list_warnings },
   { 'l', "load",                  ARG_MAND, load_module },
   { 'm', "show-module-errors",    ARG_NONE, show_module_errors },
   { 'o', "list-parse-options",    ARG_NONE, list_parse_options },
   { 'p', "set-parse-option",      ARG_MAND, set_parse_option },
   { '\0', "only-first-exception", ARG_NONE, only_first_exception },
   { 'r', "warnings-are-errors",   ARG_NONE, warn_to_err },
   { 's', "show-charsets",         ARG_NONE, show_charsets },
   { 'w', "enable-warning",        ARG_MAND, enable_warning },
   { 'x', "exec-class",            ARG_OPT,  do_exec_class },
   { '\0', "lockdown",             ARG_NONE, do_lockdown },
   { 'A', "lock-warnings",         ARG_NONE, do_lock_warnings },
   { '\0', "allow-bare-refs",      ARG_NONE, allow_bare_refs },
   { '\0', "assume-local",         ARG_NONE, assume_local },
   { 'n', "new-style",             ARG_NONE, new_style },
   { '\0', "no-class-defs",        ARG_NONE, do_no_class_defs },
   { '\0', "no-database",          ARG_NONE, do_no_database },
   { 'D', "define",                ARG_MAND, set_define },
   { 'E', "no-external-process",   ARG_NONE, do_no_external_process },
   { '\0', "no-external-access",   ARG_NONE, do_no_external_access },
   { '\0', "no-external-info",     ARG_NONE, do_no_external_info },
   { 'F', "no-filesystem",         ARG_NONE, do_no_filesystem },
   { 'G', "no-global-vars",        ARG_NONE, do_no_global_vars },
   { 'H', "parse-option-help",     ARG_NONE, show_parse_option_help },
   { 'I', "no-child-restrictions", ARG_NONE, do_no_child_po_restrictions },
   { '\0', "no-constant-defs",     ARG_NONE, do_no_constant_defs },
   { 'K', "lock-options",          ARG_NONE, do_lock_options },
   { 'L', "no-top-level",          ARG_NONE, do_no_top_level },
   { 'M', "no-namespace-defs",     ARG_NONE, do_no_namespace_defs },
   { 'N', "no-new",                ARG_NONE, do_no_new },
   { 'O', "require-our",           ARG_NONE, do_require_our },
   { '\0', "require-types",        ARG_NONE, do_require_types },
   { '\0', "no-locale-controle",   ARG_NONE, do_no_locale_control },
   { '\0', "require-prototypes",   ARG_NONE, do_require_prototypes },
   { '\0', "strict-args",          ARG_NONE, do_strict_args },
   { 'P', "no-process-control",    ARG_NONE, do_no_process_control },
   { 'R', "no-thread-control",     ARG_NONE, do_no_thread_control },
   { 'S', "no-subroutine-defs",    ARG_NONE, do_no_subroutine_defs },
   { 'T', "no-threads",            ARG_NONE, do_no_threads },
   { 'V', "version",               ARG_NONE, do_version },
   { 'W', "enable-all-warnings",   ARG_NONE, enable_warnings },
   { '\0', "no-thread-classes",    ARG_NONE, do_no_thread_classes },
   { '\0', "no-thread-info",       ARG_NONE, do_no_thread_info },
   { 'X', "eval",                  ARG_MAND, set_eval_arg },
   { 'Y', "no-network",            ARG_NONE, do_no_network },
   { 'z', "time-zone",             ARG_MAND, set_time_zone },
   { '\0', "no-terminal-io",       ARG_NONE, do_no_terminal_io },
   { '\0', "no-gui",               ARG_NONE, do_no_gui },
   { '\0', "no-io",                ARG_NONE, do_no_io },
   { '\0', "lgpl",                 ARG_NONE, set_lgpl },
   { '\0', "mit",                  ARG_NONE, set_mit },
   { '\0', "module-dir",           ARG_NONE, show_binary_module_dir },
   { '\0', "user-module-dir",      ARG_NONE, show_user_module_dir },
   { '\0', "module-path",          ARG_NONE, show_module_path },
   { '\0', "short-version",        ARG_NONE, short_version },
   { '\0', "module-api",           ARG_NONE, show_module_api },
   { '\0', "module-apis",          ARG_NONE, show_module_apis },
   { '\0', "latest-module-api",    ARG_NONE, show_latest_module_api },
   // debugging options
   { 'b', "disable-signals",       ARG_NONE, disable_signals },
   { 'd', "debug",                 ARG_MAND, do_debug },
   { 't', "trace",                 ARG_NONE, do_trace },
};

#define NUM_OPTS (sizeof(options) / sizeof(struct opt_struct_s))

static inline void missing_char_option(int i) {
   printe("option '%c' requires an argument.\n", options[i].short_opt);
   opt_errors++;
}

static inline void missing_str_option(int i) {
   printe("option '%s' requires an argument.\n", options[i].long_opt);
   opt_errors++;
}

static inline void excess_option(int i) {
   printe("option '%s' does not take an argument.\n", options[i].long_opt);
   opt_errors++;
}

static inline void invalid_option(char* opt) {
   printe("error: '--%s' is not a valid long option.\n", opt);
   opt_errors++;
}

static inline void invalid_option(char opt) {
   printe("error: '-%c' is not a valid short option.\n", opt);
   opt_errors++;
}

// *i is the argument position, *j is the index in the string
static const char* get_arg(char* argv[], unsigned *i, unsigned *j, unsigned argc) {
   if (*i >= argc)
      return 0;
   // if next character is an assignment character, then advance character pointer
   if (is_assign_char(argv[*i][*j]))
      (*j)++;
   // if at end of argument string, try next one
   if (!argv[*i][*j])
   {
      // increment argument pointer
      (*i)++;
      // set character pointer to first character
      (*j) = 0;
      // if there are no more strings then return 0!
      if ((*i) == argc)
	 return 0;
   }
   return &argv[*i][*j];
}

static void process_str_opt(char* argv[], unsigned *i, unsigned j, unsigned argc);

// *i is the argument position, *j is the index in the string
static int process_char_opt(char* argv[], unsigned *i, unsigned *j, unsigned argc) {
   unsigned x;

   if (isblank(argv[*i][*j])) {
      do
	 (*j)++;
      while (isblank(argv[*i][*j]));
      if (argv[*i][*j] == '-') {
	 if (argv[*i][*j] == '-') {
	    process_str_opt(argv, i, *j + 1, argc);
	    return 1;
	 }
	 else
	    (*j)++;
      }
   }

   char c = argv[*i][*j];

   for (x = 0; x < NUM_OPTS; x++)
      if (options[x].short_opt == c) {
	 //printf("found '%c' %s (%d)\n", c, options[x].long_opt, options[x].arg);
	 if (options[x].arg == ARG_MAND ||
	     (options[x].arg == ARG_OPT && (argv[*i][(*j) + 1] == '='))) {
	    const char* arg;

	    // increment string index
	    (*j)++;
	    if (!(arg = get_arg(argv, i, j, argc)))
	       missing_char_option(x);
	    else
	       options[x].opt_func(arg);
	    /* as the argument pointer always advances to the next argument
	     * due to the get_arg() function, return 1 to break out of the
	     * character loop for the current arg */
	    return 1;
	 }
	 options[x].opt_func(0);
	 return 0;
      }
   // if the option is not present, then raise an error
   invalid_option(c);
   return 0;
}

// *i is the argument position
static void process_str_opt(char* argv[], unsigned *i, unsigned j, unsigned argc)
{
   unsigned x, option_present = 0;
   char* opt = &argv[*i][j];

   // find option string (left side of string if there is an assignment char)
   for (x = 2; x < strlen(argv[*i]); x++) {
      if (is_assign_char(argv[*i][x])) {
	 option_present = x + 1;
	 opt = (char* )malloc(sizeof(char) * (x - 1));
	 strncpy(opt, &argv[*i][2], x - 2);
	 opt[x - 2] = '\0';
	 break;
      }
   }
   // if the option is not in the same argument, then increment the argument pointer
   if (!option_present)
      ++(*i);

   for (x = 0; x < NUM_OPTS; x++) {
      if (!strcmp(options[x].long_opt, opt)) {
	 if (!options[x].arg) {
	    if (option_present)
	       excess_option(x);
	    else
	       --(*i);
	    options[x].opt_func(0);
	 }
	 else if (options[x].arg == ARG_OPT) {
	    const char* arg = 0;

	    if (option_present)
	       arg = get_arg(argv, i, &option_present, argc);
	    else
	       --(*i);
	    options[x].opt_func(arg);
	 }
	 else {
	    const char* arg;

	    if (!(arg = get_arg(argv, i, &option_present, argc)))
	       missing_str_option(x);
	    else
	       options[x].opt_func(arg);
	 }
	 break;
      }
   }

   // if the option is not present, then raise an error
   if (x == NUM_OPTS)
      invalid_option(opt);

   if (option_present)
      free(opt);
}

// returns either 0 or a string that must be freed with free()
// also sets up the global ARGV argument list
static char* parse_command_line(unsigned argc, char* argv[]) {
   pn = basename(argv[0]);

   // file name to return, if any
   char* fn = 0;

   unsigned i = 1;

   // check all arguments
   for (; i < argc; i++) {
      printd(5, "parse_command_line() %d/%d=%s\n", i, argc, argv[i]);
      if (argv[i][0] == '-') {
	 if (!argv[i][1]) {
	    i++;
	    break;
	 }
	 else {
	    if (argv[i][1] == '-') {
	       if (!argv[i][2]) {
		  i++;
		  break;
	       }
	       process_str_opt(argv, &i, 2, argc);
	    }
	    else {
	       unsigned j;

	       for (j = 1; j < strlen(argv[i]); j++)
		  if (process_char_opt(argv, &i, &j, argc))
		     break;
	    }
	 }
      }
      else {
	 // only set the file name if the --exec option has not been set
	 if (!cl_pgm)
	    fn = strdup(argv[i++]);
	 break;
      }
   }

// pvanek - argc check removed, just because the i value is checked
// directly in qore_setup_argv(). ARGV and mainly QORE_ARGV should
// be set in any case.
   qore_setup_argv(i, argc, argv);

   if (opt_errors) {
      printe(suggest, pn);
      exit(1);
   }
   return fn;
}

int qore_main_intern(int argc, char* argv[], int other_po) {
   int rc = 0;

   if (other_po)
      parse_options |= other_po;

   // parse the command line
   char* program_file_name = parse_command_line(argc, argv);
   ON_BLOCK_EXIT(free, program_file_name);

   // initialize Qore subsystem
   qore_init(license, def_charset, show_mod_errs, qore_lib_options);

   ExceptionSink wsink, xsink;
   {
      QoreProgramHelper qpgm(parse_options, xsink);
      bool mod_errs = false;

      // set parse defines
      qpgm->parseCmdLineDefines(xsink, wsink, warnings, defmap);

      if (xsink.isException()) {
         rc = 2;
         xsink.handleExceptions();
         goto exit;
      }

      // load any modules requested on the command-line
      for (cl_mod_list_t::iterator i = cl_mod_list.begin(), e = cl_mod_list.end(); i != e; ++i) {
	 // display any error messages
	 SimpleRefHolder<QoreStringNode> err(MM.parseLoadModule((*i).c_str(), *qpgm));
	 if (err) {
	    printf("cannot load '%s': %s\n", (*i).c_str(), err->getBuffer());
	    mod_errs = true;
	 }
      }

      cl_mod_list.clear();
      if (mod_errs) {
	 printf("please fix the errors listed above and try again.\n");
	 rc = 2;
	 goto exit;
      }

      // set time zone if requested
      if (cmd_zone)
	 qpgm->parseSetTimeZone(cmd_zone);

      // lock the parse options if necessary
      if (lock_options)
	 qpgm->lockOptions();

      // parse immediate argument if any
      if (eval_arg) {
	 QoreString str("printf(\"%N\\n\", (");
	 str.concat(eval_arg);
	 str.concat("));");
	 qpgm->parse(str.getBuffer(), "<command-line>", &xsink, &wsink, warnings);
      }
      else  {
	 // set for program class execution if "exec_class" is set
	 if (exec_class) {
	    if (exec_class_name)
	       qpgm->setExecClass(exec_class_name);
	    else if (program_file_name) {
	       char* cn = make_class_name(program_file_name);
	       qpgm->setExecClass(cn);
	       free(cn);
	    }
	    else {
	       fprintf(stderr, "error, missing class name to instantiate as application\n");
	       rc = 1;
	       goto exit;
	    }
	 }

	 // parse the program
	 if (cl_pgm)
	    qpgm->parse(cl_pgm, "<command-line>", &xsink, &wsink, warnings);
	 else if (program_file_name)
	    qpgm->parseFile(program_file_name, &xsink, &wsink, warnings, only_first_except);
	 else
	    qpgm->parse(stdin, "<stdin>", &xsink, &wsink, warnings);
      }

      // display any warnings now
      if (wsink.isException()) {
	 wsink.handleWarnings();
	 if (warnings_are_errors && !xsink.isException()) {
	    printf("exiting due to the above warnings...\n");
	    rc = 2; // set return code to 2 if there were parse warnings to be treated as errors
	    goto exit;
	 }
      }

      // if there were no parse exceptions, execute the program
      if (!xsink.isException()) {
	 {
	    // execute the program and get the return value
	    AbstractQoreNode* rv = qpgm->run(&xsink);
	    // set the return code for this program from the core returned by the Qore program
	    rc = rv ? rv->getAsInt() : 0;
	    discard(rv, &xsink);
	 }

	 // if there is any unhandled exception, set the return code to 3
	 if (xsink.isException())
	    rc = 3;
      }
      else // set return code to 2 if there were parse errors
	 rc = 2;

      // run the default exception handler on any unhandled exceptions in the primary thread or during parsing
      xsink.handleExceptions();

exit:
      ;
   }
   // run the default exception handler on any unhandled exceptions if necessary (again)
   // -- exceptions could have been thrown in the QoreProgram object's destructor
   xsink.handleExceptions();

   // cleanup Qore subsystem (deallocate memory, etc)
   qore_cleanup();

   return rc;
}
