adtools/clib2

/*
 * $Id: stdlib_system.c,v 1.10 2006-01-08 12:04:26 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * 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 = ERROR;
                    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;

                /* Don't try to translate the name of the command unless it has
                   path name separator characters in it. */
                if(strchr(command_name,'/') != NULL && __translate_unix_to_amiga_path_name((const char **)&command_name,&command_nti) != 0)
                {
                    result = ERROR;
                    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 = ERROR;
                    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();

        /* Push all currently buffered output towards the file handles,
           in case the program to be launched writes to these files
           or the console, too. */
        __flush_all_files(-1);

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

        PROFILE_ON();
    }

 out:

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

    RETURN(result);
    return(result);
}