/*
 * Copyright (C) 2003  Sam Horrocks
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

Required functionality for each major component of SpeedyCGI:

Apache Module:
    - Set options from the httpd.conf file (set)
    - Set options from the environment (init)
    - Use the OPTVAL values
    - Set the the script's argv (set_script)

Speedy Command-Line
    - Set options from argv and environment (init)
    - Use the OPTVAL values

Frontend:
    - Possibly read values from the #! line in the script file. (read_shbang)
    - Get the script argv (script_argv)
    - Use the OPTVAL values
    - Call the speedy backend (exec_argv and exec_envp)

Backend:
    - Get perl/speedy options from the command line (init)
    - Get the script argv (script_argv)
    - Use the OPTVAL values
    - Set options from calls via CGI::SpeedyCGI (set_byname)
    - Call perl with the correct argv (perl_argv)
    - Call the speedy backend (exec_argv and exec_envp)


Functionality for the speedy_opt module:

Inputs:
    - The #! line in the script
    - Argv to the speedy-frontend
    - Argv to the speedy-backend
    - Unix environment variables
    - Settings in the httpd.conf file
    - Script argv
    - Settings in the backend made by the perl program

Outputs:
    - Argv for speedy_backend
	- For mod_speedycgi, use:
	    - Settings from the httpd.conf file
	    - The script argv set by the code
	- For others:
	    - Original argv from program
    - Environment for speedy_backend
	- Original env from program
    - The script argv
	- For mod_speedycgi, must use the previously input argv
	- For others, get from the program's argv
    - Argv for perl
	- Arg0 must be path from #! line in script
	- Perl options from original argv
	- Perl options from the #! line
	- Perl options from the PerlArgs option
	- Current value of the script argv
    - OPTVAL values
	- Settings from httpd.conf file
	- Settings from environment
	- Options from the program argv
	- Options from the #! line

Program design:

Globs:
    exec_argv, exec_envp, script_argv, perl_argv

void speedy_opt_init(const char * const *argv, const char * const *envp);
    - Take the argv and split it into perl args, speedy args and script args
    - Append to the speedy args any options that were changed prior to
      this call.
    - Set our OptRec values based on the speedy args
    - Append to the perl args the value of the PerlArgs option, if set
    - Store into exec_argv the perl args plus, speedy args and the script args
    - Point script_argv to a location inside exec_argv
    - Copy the envp into exec_envp
    - Set our OptRec values based on the environment

void speedy_opt_read_shbang();
    - Split the #! line into arg0, perl args and speedy options
    - Put arg0 into perl_argv[0]
    - Append the other perl args to the end of perl_argv
    - Set our OptRec values based on the speedy args

void speedy_opt_set_script_argv(const char * const *argv);
    - Replace the existing script_argv with a copy of this argv

const char * const *speedy_opt_script_argv();
    - Return the existing script_argv

char **speedy_opt_perl_argv();
    - If not called before, append the script argv to the end of perl_argv
    - Return the perl_argv

const char * const *speedy_opt_exec_argv();
    - Return the exec_argv

const char * const *speedy_opt_exec_envp();
    - Return the existing exec_envp