Since not all MCS 213 students can try DEBUG commands because of the technical problems of our computers, search now any Turbo C program with assembly

#include

#include

#include

#include

#include

#include

unsigned char buffer[3];
FILE *fd;
int handle;
fail(char *);
void pass(char *);
main(int argc,char *argv[])
{
int n;
if(argc!=3)
{
printf("\nFailpass Utility v1.0 Email: chingpongin@yahoo.co.in");
printf("\nEnable/Disable .EXE or .COM execution");
printf("\nsyntex failpass fail ");
printf("\n or");
printf("\n failpass pass ");
exit(2);
}
strupr(argv[1]);
n=strcmp(argv[1],"FAIL");
if(n==0)
{
fail(argv[2]);
exit(2);
}
n=strcmp(argv[1],"PASS");
if(n==0)
{
pass(argv[2]);
exit(2);
}
return 0;
}
fail(char *fname)
{
_chmod(fname,1,FA_ARCH);
fd=fopen(fname,"rb+");
if(fd==NULL)
{
printf("\nCann't open %s\n\n",fname);
exit(2);
}
fseek(fd,0,SEEK_SET);
fread(buffer,2,1,fd);
if(buffer[0]==0xcd)
if(buffer[1]==0x20)
{
fclose(fd);
printf("\n%s already protected...\n\n",fname);
exit(2);
}
fseek(fd,0,SEEK_END);
fwrite(buffer,2,1,fd);
fseek(fd,0,SEEK_SET);
buffer[0]=0xcd; /* don't take any PANGA with this line */
buffer[1]=0x20; /* don't take any PANGA with this line */
fwrite(buffer,2,1,fd);
fclose(fd);
return 0;
}
void pass(char *fname)
{
int xyz;
fd=fopen(fname,"rb+");
if(fd==NULL)
{
fclose(fd);
printf("\nCannot open file %s\n\n",fname);
exit(2);
}
fseek(fd,0,SEEK_SET);
fread(buffer,2,1,fd);
if(buffer[0]!=0xcd)
if(buffer[1]!=0x20)
{
fclose(fd);
printf("\n%s is NOT protected....\n\n",fname);
exit(2);
}
fseek(fd,-2,SEEK_END);
fread(buffer,2,1,fd);
fseek(fd,0,SEEK_SET);
fwrite(buffer,2,1,fd);
fclose(fd);
handle=open(fname,O_RDWR);
chsize(handle,(filelength(handle))-2);
close(handle);
}