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annotate toys/posix/ln.c @ 656:6df4ccc0acbe

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Regularize command headers, update links to standards documents.
author Rob Landley <rob@landley.net>
date Sat, 25 Aug 2012 18:08:51 -0500
parents 2986aa63a021
children 7e846e281e38
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * ln.c - Create filesystem links
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4 *
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5 * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
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6 *
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7 * See http://opengroup.org/onlinepubs/9699919799/utilities/ln.html
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9 USE_LN(NEWTOY(ln, "<1nfs", TOYFLAG_BIN))
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10
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11 config LN
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12 bool "ln"
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13 default y
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14 help
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15 usage: ln [-sf] [FROM...] TO
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17 Create a link between FROM and TO.
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18 With only one argument, create link in current directory.
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19
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20 -s Create a symbolic link
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21 -f Force the creation of the link, even if TO already exists
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22 -n Symlink at destination treated as file
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23 */
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24
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25 #include "toys.h"
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26
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27 #define FLAG_s 1
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28 #define FLAG_f 2
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29 #define FLAG_n 4
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30
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31 void ln_main(void)
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32 {
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33 char *dest = toys.optargs[--toys.optc], *new;
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34 struct stat buf;
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35 int i;
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36
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37 // With one argument, create link in current directory.
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38 if (!toys.optc) {
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39 toys.optc++;
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40 dest=".";
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41 }
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42
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43 // Is destination a directory?
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44 if (((toys.optflags&FLAG_n) ? lstat : stat)(dest, &buf)
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45 || !S_ISDIR(buf.st_mode))
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46 {
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47 if (toys.optc>1) error_exit("'%s' not a directory");
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48 buf.st_mode = 0;
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49 }
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50
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51 for (i=0; i<toys.optc; i++) {
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52 int rc;
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53 char *try = toys.optargs[i];
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54
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55 if (S_ISDIR(buf.st_mode)) {
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56 new = strrchr(try, '/');
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57 if (!new) new = try;
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58 new = xmsprintf("%s/%s", dest, new);
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59 } else new = dest;
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60 /* Silently unlink the existing target. If it doesn't exist,
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61 * then we just move on */
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62 if (toys.optflags & FLAG_f) unlink(new);
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63
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64 rc = (toys.optflags & FLAG_s) ? symlink(try, new) : link(try, new);
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65 if (rc)
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66 perror_exit("cannot create %s link from '%s' to '%s'",
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67 (toys.optflags & FLAG_s) ? "symbolic" : "hard", try, new);
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68 if (new != dest) free(new);
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69 }
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70 }