usr/src/ucbcmd/ln/ln.c

/*
 * Copyright 1991 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*
 * ln
 */
#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>

struct	stat stb;
int	fflag;		/* force flag set? */
int	sflag;

int linkit(char *, char *);
void Perror(char *);

int
main(int argc, char **argv)
{
	int i, r;

	argc--, argv++;
again:
	if (argc && strcmp(argv[0], "-f") == 0) {
		fflag++;
		argv++;
		argc--;
	}
	if (argc && strcmp(argv[0], "-s") == 0) {
		sflag++;
		argv++;
		argc--;
	}
	if (argc == 0)
		goto usage;
	else if (argc == 1) {
		argv[argc] = ".";
		argc++;
	}
	if (argc > 2) {
		if (stat(argv[argc-1], &stb) < 0)
			goto usage;
		if ((stb.st_mode&S_IFMT) != S_IFDIR)
			goto usage;
	}
	r = 0;
	for (i = 0; i < argc-1; i++)
		r |= linkit(argv[i], argv[argc-1]);
	exit(r);
usage:
	(void) fprintf(stderr,
	    "Usage: ln [-f] [-s] f1\n\
       ln [-f] [-s] f1 f2\n\
       ln [-f] [-s] f1 ... fn d1\n");
	return (1);
}

int
linkit(char *from, char *to)
{
	char destname[MAXPATHLEN + 1];
	char *tail;
	int (*linkf)() = sflag ? symlink : link;
	char *strrchr();

	/* is target a directory? */
	if (sflag == 0 && fflag == 0 && stat(from, &stb) >= 0 &&
	    (stb.st_mode&S_IFMT) == S_IFDIR) {
		printf("%s is a directory\n", from);
		return (1);
	}
	if (stat(to, &stb) >= 0 && (stb.st_mode&S_IFMT) == S_IFDIR) {
		tail = strrchr(from, '/');
		if (tail == 0)
			tail = from;
		else
			tail++;
		if (strlen(to) + strlen(tail) >= sizeof (destname) - 1) {
			(void) fprintf(stderr, "ln: %s/%s: Name too long\n",
			    to, tail);
			return (1);
		}
		(void) sprintf(destname, "%s/%s", to, tail);
		to = destname;
	}
	if ((*linkf)(from, to) < 0) {
		if (errno == EEXIST || sflag)
			Perror(to);
		else if (access(from, 0) < 0)
			Perror(from);
		else
			Perror(to);
		return (1);
	}
	return (0);
}

void
Perror(char *s)
{
	(void) fprintf(stderr, "ln: ");
	perror(s);
}