BSD 4_1c_2 release

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

static  char sccsid[] = "@(#)ln.c 4.4 11/8/82";
/*
* ln
*/
#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++;
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 (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:
       fprintf(stderr, "Usage: ln [ -s ] f1\nor: ln [ -s ] f1 f2\nln [ -s ] f1 ... fn d2\n");
       exit(1);
}

int     link(), symlink();

linkit(from, to)
       char *from, *to;
{
       char *tail;
       int (*linkf)() = sflag ? symlink : link;

       /* 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);
}