4.3BSD - /usr/src/bin/ln.c

   1: static  char sccsid[] = "@(#)ln.c 4.6 11/15/85";
   2: /*
   3:  * ln
   4:  */
   5: #include <stdio.h>
   6: #include <sys/types.h>
   7: #include <sys/stat.h>
   8: #include <errno.h>
   9: 
  10: struct  stat stb;
  11: int fflag;      /* force flag set? */
  12: int sflag;
  13: char    name[BUFSIZ];
  14: char    *rindex();
  15: extern  int errno;
  16: 
  17: main(argc, argv)
  18:     int argc;
  19:     register char **argv;
  20: {
  21:     register int i, r;
  22: 
  23:     argc--, argv++;
  24: again:
  25:     if (argc && strcmp(argv[0], "-f") == 0) {
  26:         fflag++;
  27:         argv++;
  28:         argc--;
  29:     }
  30:     if (argc && strcmp(argv[0], "-s") == 0) {
  31:         sflag++;
  32:         argv++;
  33:         argc--;
  34:     }
  35:     if (argc == 0)
  36:         goto usage;
  37:     else if (argc == 1) {
  38:         argv[argc] = ".";
  39:         argc++;
  40:     }
  41:     if (sflag == 0 && argc > 2) {
  42:         if (stat(argv[argc-1], &stb) < 0)
  43:             goto usage;
  44:         if ((stb.st_mode&S_IFMT) != S_IFDIR)
  45:             goto usage;
  46:     }
  47:     r = 0;
  48:     for(i = 0; i < argc-1; i++)
  49:         r |= linkit(argv[i], argv[argc-1]);
  50:     exit(r);
  51: usage:
  52:     fprintf(stderr, "Usage: ln [ -s ] f1\nor: ln [ -s ] f1 f2\nln [ -s ] f1 ... fn d2\n");
  53:     exit(1);
  54: }
  55: 
  56: int link(), symlink();
  57: 
  58: linkit(from, to)
  59:     char *from, *to;
  60: {
  61:     char *tail;
  62:     int (*linkf)() = sflag ? symlink : link;
  63: 
  64:     /* is target a directory? */
  65:     if (sflag == 0 && fflag == 0 && stat(from, &stb) >= 0
  66:         && (stb.st_mode&S_IFMT) == S_IFDIR) {
  67:         printf("%s is a directory\n", from);
  68:         return (1);
  69:     }
  70:     if (stat(to, &stb) >= 0 && (stb.st_mode&S_IFMT) == S_IFDIR) {
  71:         tail = rindex(from, '/');
  72:         if (tail == 0)
  73:             tail = from;
  74:         else
  75:             tail++;
  76:         sprintf(name, "%s/%s", to, tail);
  77:         to = name;
  78:     }
  79:     if ((*linkf)(from, to) < 0) {
  80:         if (errno == EEXIST || sflag)
  81:             perror(to);
  82:         else if (access(from, 0) < 0)
  83:             perror(from);
  84:         else
  85:             perror(to);
  86:         return (1);
  87:     }
  88:     return (0);
  89: }

Defined functions

Defined variables