/************* 
customizer for KioskCD 
v2.6 for Unix
March 2005

Visit kioskcd.com

Seeks to known point in ISO file and fwrites new config file,
then fills up the rest of the file with empty lines.

Source code licensed under Gnu General Public License.
(gnu.org).

*****************/

#define CFG_OFFSET 0214000L

#include <stdio.h>

main(int argc, char *argv[])
{
	int i, c, first;
	long rc;
	char cfgname[200], isoname[200], *cmd, str[500];
	FILE *cfgfp, *isofp;

	i = 0;
	cmd = strrchr(argv[i++], '/') + 1;
	if (! cmd)
		cmd = argv[0];
	if (argc < 3)  {
		printf("Usage: %s config-file iso-file\n", argv[0]);
		return 1;
		}

	strcpy(cfgname, argv[i++]);
	strcpy(isoname, argv[i++]);

	printf("Apply config file %s\n\tto ISO file %s ([y]/n)? ",
							cfgname, isoname);
	c = getchar();
	if (c == '\n')
		c = 'y';
	if (c != 'y')  {
		printf("No action.\n");
		printf("Usage: %s config-file iso-file\n", cmd);
		return 1;
		}

	cfgfp = fopen(cfgname, "r");
	if (! cfgfp)  {
		printf("Error: can't open %s for reading\n", cfgname);
		printf("Usage: %s config-file iso-file\n", cmd);
		return 1;
		}
	isofp = fopen(isoname, "r+");
	if (! isofp)  {
		printf("Error: can't open %s for update\n", isoname);
		printf("Usage: %s config-file iso-file\n", cmd);
		return 1;
		}
	fseek(isofp, CFG_OFFSET, SEEK_SET);
	rc = 0L;
	while (fgets(str, 500, cfgfp))  
		rc += fwrite(str, 1, strlen(str), isofp);
	if (! rc)  {
		printf("Error: write failed to %s\n", isoname);
		printf("Usage: %s config-file iso-file\n", cmd);
		}
	else  {		// filler 
		printf("Wrote %ld bytes to %s\n", rc, isoname);
		rc += 71;
		*str = 0;
		for (i = 0; i < 70; i++)   
			strcat(str, " ");
		strcat(str, "\n");
		for (i = rc; i < 9980; i += 71)
			fwrite(str, 1, strlen(str), isofp);
		fwrite("# end\n", 1, 6, isofp);
		}
	fclose(isofp);
	fclose(cfgfp);
}