Hi!
I've tried this simple prog to encrypt a file using XOR
But it gives "Segmentation Fault " in 'interactive' mode (pls see the
source code)
it runs perfectly well in DOS (using Turbo C++ 3.0)
Can ny1 help pls ?
--
Nikhil Joshi
/* Program to Encrypt A file */
#include <stdio.h>
#include <stdlib.h>
int
main (int argc, char *argv[])
{
void crypt ();
char *arg[4];
if (argc != 4)
//if no arguments or wrong arguments then take i/p interactively
{
printf ("Please enter password\n");
gets (arg[1]);
printf ("Please enter the file to be encrypted/decrypted\n");
gets (arg[2]);
printf ("Please enter the output filename\n");
gets (arg[3]);
crypt (arg);
}
else
crypt (argv);
printf ("\n Success! \n");
return 0;
}
void
crypt (char *cr_arg[])
{
FILE *fi, *fo;
char *cp;
int c;
if ((cp = cr_arg[1]) == NULL)
{
printf ("Invalid password\n");
exit (1);
}
if ((fi = fopen (cr_arg[2], "rb")) == NULL)
{
perror ("Unable to open input file ");
exit (1);
}
if ((fo = fopen (cr_arg[3], "wb")) == NULL)
{
perror ("Unable to create output file ");
exit (1);
}
while ((c = getc (fi)) != EOF)
{
if (!*cp)
cp = cr_arg[1];
c ^= *(cp++); //Uses XOR algorithm
putc (c, fo);
}
fclose (fo);
fclose (fi);
return;
}
