#include <stdio.h>
#include <string.h>

/*
 * Extract the files for Efficient C Programming
 * Invoke as a.out ArchiveFile
 * where ArchiveFile is the name of the downloaded file
 */

#define PrefixString "ECP: FILEname="
#define MaxLineLen   256

int
main( int argc, char *argv[ ] )
{
    FILE *ArchiveFp;
    char ThisLine[ MaxLineLen + 2 ];
    char CurrentFile[ 256 ];
    FILE *CurrentFp = NULL;

    if( argc != 2 )
    {
        fprintf( stderr, "Usage: %s file\n", argv[ 0 ] );
        return 1;
    }
    ArchiveFp = fopen( argv[ 1 ], "r" );
    if( ArchiveFp == NULL )
    {
        perror( argv[ 1 ] );
        return 1;
    }

    while( fgets( ThisLine, MaxLineLen, ArchiveFp ) != NULL )
    {
        if( strstr( ThisLine, PrefixString ) != NULL )
            if( sscanf( ThisLine, "/* " PrefixString "%s" " */", CurrentFile ) )
            {
                if( CurrentFp != NULL )
                    fclose( CurrentFp );
                CurrentFp = fopen( CurrentFile, "w" );
                if( CurrentFp == NULL )
                {
                    perror( CurrentFile );
                    return 1;
                }
                printf( "Extracting %s\n", CurrentFile );
            }
        fputs( ThisLine, CurrentFp );
    }

    fclose( CurrentFp );
    fclose( ArchiveFp );

    return 0;
}