Source Code 1992 March/Source_Code_CD-ROM_Walnut_Creek_March_1992.iso/usenet/compsrcs/apple2/29

Text File | 1990-11-26 | 5.9 KB | 252 lines

Path: wuarchive!mit-eddie!rutgers!aramis.rutgers.edu!paul.rutgers.edu!jac
From: [e-mail] (Jonathan A. Chandross)
Newsgroups: comp.sources.apple2
Subject: v001SRC007:  AAF unpack source (REPOST)
Message-ID: <[e-mail]>
Date: 20 Nov 90 01:10:11 GMT
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 241
Approved: [e-mail]


Submitted-by: jac
Posting-number: Volume 1, Source:7
Archive-name: archive/upaaf.c
Architecture: ANY_2
Version-number: 1.01

Did I ever blow it.  The version of upaaf.c that I posted had a mistake
in it that should never have occurred.  (Cast of EOF instead of NULL).
Rather than post a patch, I am reposting the entire program since it is
quite small.  Earlier postings have been cancelled.

Apologies for the stupidity.

******* cut here ****

/*
 *******************************************************************************
 *
 * upaaf.c
 *
 * Unpack an archive in apple format.
 *
 * Another quality product handcrafted with loving care by:
 *    Jonathan A. Chandross
 *    [e-mail]
 *    November 1990
 *
 * COPYRIGHT 1990 by Jonathan A. Chandross
 * All rights reserved.
 *
 * Use "cc -D SHELL" to compile for use with a shell.
 *
 * Version 1.01
 *
 *******************************************************************************
 */

#include <stdio.h>

/*
 *******************************************************************************
 *
 * Defines
 *
 * EXPORT        function is visible outside this module
 * IMPORT        function is defined outside this module
 * STATIC        function is invisible outside this module
 *
 * LENGTH        length of strings
 *
 *******************************************************************************
 */
#define EXPORT
#define IMPORT    extern
#define LOCAL    static

#define LENGTH    255

/*
 *******************************************************************************
 *
 * main
 *
 * Unpacks a file in Apple Archive Format
 *
 * Parameters:
 *    argc            number of command line arguments if compiled
 *                for a shell
 *    argv            command line argument vector
 * Locals:
 *    archive_name        name of archive to unpack if not using a
 *                shell
 * Returns:
 *
 * If this program is compiled for use with a shell, the first command line
 * argument is considered to contain the name of the archive to unpack.  If
 * this program is compiled stand-alone, i.e. not for use with a shell, it
 * prompts for the archive to unpack.
 *
 * The SHELL define is an unsightly way to do things, but there is little
 * choice if this program is to be used on an Apple lacking some sort of
 * shell.
 *
 *******************************************************************************
 */
#ifdef SHELL
EXPORT int main(argc, argv)
int        argc;
char        *argv[];
#else
EXPORT int main()
#endif
{
IMPORT    void    unpack();
#ifdef SHELL
IMPORT    void    usage();
#else
char        archive_name[LENGTH];
#endif

#ifdef SHELL
    /*
     * If we are using a shell, then argv[1] will be the name of the
     * archive to unpack.
     */
    if(argc == 2)
        unpack(argv[1]);
    else {
        usage(argv[0]);
        exit(1);
        }
#else
    (void) fputs("Enter name of archive to unpack:", stdout);
    (void) scanf("%s", archive_name);
    unpack(archive_name);
#endif

    return(0);
}

/*
 *******************************************************************************
 *
 * usage
 *
 * Print out a message on how to use this program
 *
 * Parameters:
 *    object_name        name of object file storing this program
 * Locals:
 * Returns:
 *
 *******************************************************************************
 */
#ifdef SHELL
LOCAL void usage(object_name)
char        *object_name;
{
    (void) fprintf(stderr, "Usage: %s archive-name\n", object_name);
}
#endif

/*
 *******************************************************************************
 *
 * unpack
 *
 * Unpack an archive
 *
 * Parameters:
 *    archive_file_name    name of archive file to unpack
 * Locals:
 *    buffer            holds each line as it is read out of archive
 *    archive_file        archive file
 *    output_file        current file being unpacked from archive
 * Returns:
 *
 *******************************************************************************
 */
LOCAL void unpack(archive_file_name)
char        *archive_file_name;
{
IMPORT    char    *fgets();
IMPORT    int    fput();
IMPORT    int    strlen();
IMPORT    int    fclose();
IMPORT    FILE    *fopen();
char        buffer[LENGTH];
FILE        *archive_file;
FILE        *output_file = (FILE *)NULL;

    /*
     * Open the archive file and make sure it exists.
     */
    if((archive_file = fopen(archive_file_name, "r")) == (FILE *)NULL) {
        (void) fprintf(stderr, "Error: could not open archive '%s'\n",
            archive_file_name);
        exit(1);
        }

    /*
     * As long as the file is not empty, process lines
     */
    while(fgets(buffer, LENGTH, archive_file) != (char *)NULL) {
        /*
         * What kind of line do we have?
         */
        switch(buffer[0]) {
             case '=':
            /*
             * Have a file name.  Remove the trailing newline
             * from the file-name (left by fgets) by overwriting
             * with a Null.  Then open the file and verify that
             * we can write to it.  Skip over the first character
             * in the file-name (it is an '=')
             */
            buffer[strlen(buffer) - 1] = '\0';
            (void) fprintf(stdout, "Unpacking '%s'\n", &buffer[1]);

            /*
             * If we have an open output file, close it.
             */
            if(output_file != (FILE *)NULL)
                (void) fclose(output_file);

            if((output_file = fopen(&buffer[1], "w")) ==
               (FILE *)NULL) {
                (void) fprintf(stderr,
                    "Error: could not open '%s'\n", buffer);
                exit(1);
                }
            break;
             case '-':
            /*
             * Have a line of source.  Add the line to the output
             * file without the leading "-".
             */
            if(output_file == (FILE *)NULL) {
                fputs("Error: no file specified.\n", stderr);
                exit(1);
                }
            else
                (void) fputs(&buffer[1], output_file);
            break;
             case '+':
            /*
             * End of archive.  Exit.
             */
            exit(0);
            break;
             default:
            /*
             * Have some other type of line (mail header,
             * signature, comment, etc.)  Output it.
             */
            (void) fputs(&buffer[0], stdout);
            break;
             }
        }
}