2.9BSD/usr/src/cmd/ln.c

#ifndef	lint
static	char sccsid[] = "@(#)ln.c 4.1 10/1/80";
#endif
/*
 * ln
 */
#include <whoami.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

struct	stat stb;
int	fflag;		/* force flag set? */
int	sflag;
char	name[BUFSIZ];
char	*rindex();
extern	int errno;

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

	argc--, argv++;
	if (argc && strcmp(argv[0], "-f") == 0) {
		fflag++;
		argv++;
		argc--;
	}
#ifdef	UCB_SYMLINKS
	if (argc && strcmp(argv[0], "-s") == 0) {
		sflag++;
		argv++;
		argc--;
	}
#endif
	if (argc == 0) 
		goto usage;
	else
		if (argc == 1) {
			argv[argc] = ".";
			argc++;
		}
	if (sflag == 0 && 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:
#ifdef	UCB_SYMLINKS
	fprintf(stderr, "Usage:  ln [ -s ] f1\nor:  ln [ -s ] f1 f2\nln [ -s ] f1 ... fn d2\n");
#else
	fprintf(stderr, "Usage:  ln f1\nor:  ln f1 f2\nln f1 ... fn d2\n");
#endif
	exit(1);
}

int	link();
#ifdef	UCB_SYMLINKS
int	symlink();
#endif

linkit(from, to)
	char *from, *to;
{
	char *tail;
#ifdef	UCB_SYMLINKS
	int (*linkf)() = sflag ?  symlink : link;
#else
	int (*linkf)() = link;
#endif

	/* 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 = rindex(from, '/');
		if (tail == 0)
			tail = from;
		else
			tail++;
		sprintf(name, "%s/%s", to, tail);
		to = name;
	}
	if ((*linkf)(from, to) < 0) {
		if (errno == EEXIST)
			perror(to);
		else
			perror(from);
		return (1);
	}
	return(0);
}