date and time created 80/10/30 00:36:13 by mckusick

[unix-history] / usr / src / usr.bin / strip / strip.c

static char *sccsid = "@(#)strip.c	4.1 (Berkeley) %G%";
#include <a.out.h>
#include <signal.h>
#include <pagsiz.h>

#define	BUFSIZ	BSIZE

char	*tname;
char	*mktemp();
struct exec head;
int	status;
int	tf;

main(argc, argv)
char *argv[];
{
	register i;

	signal(SIGHUP, SIG_IGN);
	signal(SIGINT, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
	tname = mktemp("/tmp/sXXXXX");
	close(creat(tname, 0600));
	tf = open(tname, 2);
	if(tf < 0) {
		printf("cannot create temp file\n");
		exit(2);
	}
	for(i=1; i<argc; i++) {
		strip(argv[i]);
		if(status > 1)
			break;
	}
	close(tf);
	unlink(tname);
	exit(status);
}

strip(name)
char *name;
{
	register f;
	long size;
	int i;

	f = open(name, 0);
	if(f < 0) {
		printf("cannot open %s\n", name);
		status = 1;
		goto out;
	}
	read(f, (char *)&head, sizeof(head));
	if (N_BADMAG(head)) {
		printf("%s not in a.out format\n", name);
		status = 1;
		goto out;
	}
	if ((head.a_syms == 0) && (head.a_trsize == 0) && (head.a_drsize ==0)) {
		printf("%s already stripped\n", name);
		goto out;
	}
	size = (long)head.a_text + head.a_data;
	head.a_syms = head.a_trsize = head.a_drsize = 0 ;
	lseek(tf, (long)0, 0);
	write(tf, (char *)&head, sizeof(head));
	if (head.a_magic == ZMAGIC)
		size += PAGSIZ - sizeof (head);
	if (copy(name, f, tf, size)) {
		status = 1;
		goto out;
	}
	size += sizeof(head);
	close(f);
	f = creat(name, 0666);
	if(f < 0) {
		printf("%s cannot recreate\n", name);
		status = 1;
		goto out;
	}
	lseek(tf, (long)0, 0);
	if(copy(name, tf, f, size))
		status = 2;

out:
	close(f);
}

copy(name, fr, to, size)
char *name;
long size;
{
	register s, n;
	char buf[BUFSIZ];

	while(size != 0) {
		s = BUFSIZ;
		if(size < BUFSIZ)
			s = size;
		n = read(fr, buf, s);
		if(n != s) {
			printf("%s unexpected eof\n", name);
			return(1);
		}
		n = write(to, buf, s);
		if(n != s) {
			printf("%s unexpected write eof\n", name);
			return(1);
		}
		size -= s;
	}
	return(0);
}