/*
 * $Id: stdlib_system.c,v 1.6 2005-03-24 15:31:16 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _STDLIB_HEADERS_H
#include "stdlib_headers.h"
#endif /* _STDLIB_HEADERS_H */

#ifndef _STIO_HEADERS_H
#include "stdio_headers.h"
#endif /* _STDIO_HEADERS_H */

/****************************************************************************/

#ifndef _STDLIB_MEMORY_H
#include "stdlib_memory.h"
#endif /* _STDLIB_MEMORY_H */

/****************************************************************************/

int
system(const char * command)
{
	char * command_copy = NULL;
	int result;

	ENTER();

	if(command == NULL)
		SHOWPOINTER(command);
	else
		SHOWSTRING(command);

	if(__check_abort_enabled)
		__check_abort();

	/* A NULL pointer for the name of the command to execute is
	 * really a query to find out whether a shell is available.
	 * We return 1 (TRUE).
	 */
	if(command == NULL)
	{
		result = 1;
	}
	else
	{
		static const struct TagItem system_tags[2] =
		{
			{ SYS_UserShell,	TRUE },
			{ TAG_END,			0 }
		};

		#if defined(UNIX_PATH_SEMANTICS)
		struct name_translation_info command_nti;
		#endif /* UNIX_PATH_SEMANTICS */

		#if defined(UNIX_PATH_SEMANTICS)
		{
			if(__unix_path_semantics)
			{
				char just_the_command_name[MAXPATHLEN+1];
				BOOL need_quotes = FALSE;
				char * command_name;
				size_t command_len;
				BOOL have_quote;
				size_t len;
				size_t i;

				/* We may need to replace the path specified for the command,
				   so let's figure out first how long the command name,
				   including everything, really is. */
				len = strlen(command);
				command_len = len;

				have_quote = FALSE;
				for(i = 0 ; i < len ; i++)
				{
					if(command[i] == '\"')
					{
						need_quotes = TRUE;
						have_quote ^= TRUE;
					}

					if((command[i] == ' ' || command[i] == '\t') && NOT have_quote)
					{
						command_len = i;
						break;
					}
				}

				/* This may be too long for proper translation... */
				if(command_len > MAXPATHLEN)
				{
					__set_errno(ENAMETOOLONG);

					result = -1;
					goto out;
				}

				/* Grab the command name itself, then have it translated. */
				command_name = just_the_command_name;
				for(i = 0 ; i < command_len ; i++)
				{
					if(command[i] != '\"')
						(*command_name++) = command[i];
				}

				(*command_name) = '\0';

				command_name = just_the_command_name;

				if(__translate_unix_to_amiga_path_name((const char **)&command_name,&command_nti) != 0)
				{
					result = -1;
					goto out;
				}

				/* Now put it all together again */
				command_copy = malloc(1 + strlen(command_name) + 1 + strlen(&command[command_len]) + 1);
				if(command_copy == NULL)
				{
					__set_errno(ENOMEM);

					result = -1;
					goto out;
				}

				if(need_quotes)
				{
					command_copy[0] = '\"';

					strcpy(&command_copy[1],command_name);
					strcat(command_copy,"\"");
				}
				else
				{
					strcpy(command_copy,command_name);
				}

				strcat(command_copy,&command[command_len]);

				command = command_copy;
			}
		}
		#endif /* UNIX_PATH_SEMANTICS */

		SHOWSTRING(command);

		PROFILE_OFF();

		/* In thread-safe mode, system() operation can interfere with
		   regular file I/O if the same dos.library file handles are
		   involved. Because we really cannot predict which file handles
		   will be associated with the current Output() and Input()
		   streams, we play it safe and just block everything. */
		__stdio_lock();

		result = SystemTagList((STRPTR)command, (struct TagItem *)system_tags);

		__stdio_unlock();

		PROFILE_ON();
	}

 out:

	if(command_copy != NULL)
		free(command_copy);

	RETURN(result);
	return(result);
}