/*
    In this example we demonstrate how to use file pointers as function parameters
*/
#include <stdio.h>
#include <stdlib.h>

/*
    This program make a copy of an ascii file.
*/

/*
    Function prototype
*/
void filecopy( FILE *, FILE * );

void main(void)
{
    char isn[80],osn[80]; /* Input and output filenames */
    FILE *fi,*fo; /* Input and output files */
    printf("Give the input file : ");
    scanf("%s",isn);
    printf("Give the output file : ");
    scanf("%s",osn);
    if ((fi=fopen(isn,"r")) == NULL) /* Open input file. */
    {
        printf("Can not open input file %s.\n",isn);
        exit( 1 );
    }
    if ((fo=fopen(osn,"w")) == NULL) /* Open output file. */
    {
        printf("Can not create output file %s.\n",osn);
        exit( 1 );
    }
    filecopy( fi, fo );
    fclose(fi); /* Close input file. */
    fclose(fo); /* Close output file. */
}

/*
    Here is the source code of function filecopy.
    Function filecopy takes two file pointers parameters and copy the contents of
    the first file parameter to the second.
*/
void filecopy( FILE *ifp, FILE *ofp )
{
    int c;
/*
    Ascii copy using getc and putc.
*/
    while ( ( c = getc( ifp ) ) != EOF )
        putc( c, ofp );
/*
    Finally we write the EOF character to the output file
*/
    putc( EOF, ofp );
}

© 2004 Jim Valavanis