fixttiocom.c

一个通讯程序源码

/*+-------------------------------------------------------------------------
	fixttiocom.c - change ttiocom to Ttiocom calls in /usr/sys/sys/libsys.a
This program patched my Xenix 386 2.3.1 system library (a copy of which
had been named libfix.a, fixed, verified, then moved to libsys.a)
--------------------------------------------------------------------------*/
/*+:EDITS:*/
/*:09-10-1992-14:00-wht@n4hgf-ECU release 3.20 */
/*:08-22-1992-15:39-wht@n4hgf-ECU release 3.20 BETA */
/*:07-25-1991-12:59-wht@n4hgf-ECU release 3.10 */
/*:08-14-1990-20:40-wht@n4hgf-ecu3.00-flush old edit history */

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>

char *lib = "libfix.a";

/* file positions where names needed changing */
#define PLACE1 0xdcaL
#define PLACE2 0x1b1cbL
#define PLACE3 0x1c41bL

/*+-------------------------------------------------------------------------
	main(argc,argv,envp)
--------------------------------------------------------------------------*/
main(argc,argv,envp)
int argc;
char **argv;
char **envp;
{
int fd = open(lib,O_RDWR,0);
unsigned char ch1,ch2,ch3;
long lseek();

	if(fd < 0)
	{
		perror(lib);
		exit(9);
	}

	if(lseek(fd,PLACE1,0) != PLACE1)
	{
		perror("seek1");
		exit(1);
	}
	if(read(fd,&ch1,1) != 1)
	{
		perror("read1");
		exit(1);
	}
	printf("char 1 = %02x\n",ch1);

	if(lseek(fd,PLACE2,0) != PLACE2)
	{
		perror("seek2");
		exit(2);
	}
	if(read(fd,&ch2,2) != 2)
	{
		perror("read2");
		exit(2);
	}
	printf("char 2 = %02x\n",ch2);


	if(lseek(fd,PLACE3,0) != PLACE3)
	{
		perror("seek3");
		exit(3);
	}
	if(read(fd,&ch3,1) != 1)
	{
		perror("read3");
		exit(3);
	}
	printf("char 3 = %02x\n",ch3);

	if((ch1 != 't') || (ch2 != 't') || (ch3 != 't'))
		exit(8);
	if(lseek(fd,PLACE1,0) != PLACE1)
	{
		perror("seek1");
		exit(1);
	}
	write(fd,"T",1);
	if(lseek(fd,PLACE2,0) != PLACE2)
	{
		perror("seek1");
		exit(1);
	}
	write(fd,"T",1);
	if(lseek(fd,PLACE3,0) != PLACE3)
	{
		perror("seek1");
		exit(1);
	}
	write(fd,"T",1);
	printf("done\n");
	close(fd);

	exit(0);
}	/* end of main */

/* vi: set tabstop=4 shiftwidth=4: */
/* end of fixttiocom.c */