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annotate toys/posix/ln.c @ 902:36993c59a3d3

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Tighten up lsusb, default to "y".
author Rob Landley <rob@landley.net>
date Tue, 14 May 2013 20:42:54 -0500
parents 3d7526f6115b
children 58daf9c9a0b1
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1 /* ln.c - Create filesystem links
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2 *
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3 * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
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4 *
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/ln.html
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6
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7 USE_LN(NEWTOY(ln, "<1nfs", TOYFLAG_BIN))
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8
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9 config LN
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10 bool "ln"
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11 default y
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12 help
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13 usage: ln [-sfn] [FROM...] TO
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15 Create a link between FROM and TO.
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16 With only one argument, create link in current directory.
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18 -s Create a symbolic link
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19 -f Force the creation of the link, even if TO already exists
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20 -n Symlink at destination treated as file
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21 */
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22
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7e846e281e38 New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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23 #define FOR_ln
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24 #include "toys.h"
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25
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26 void ln_main(void)
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27 {
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28 char *dest = toys.optargs[--toys.optc], *new;
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29 struct stat buf;
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30 int i;
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32 // With one argument, create link in current directory.
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33 if (!toys.optc) {
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34 toys.optc++;
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35 dest=".";
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36 }
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38 // Is destination a directory?
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39 if (((toys.optflags&FLAG_n) ? lstat : stat)(dest, &buf)
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40 || !S_ISDIR(buf.st_mode))
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41 {
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42 if (toys.optc>1) error_exit("'%s' not a directory");
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43 buf.st_mode = 0;
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44 }
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46 for (i=0; i<toys.optc; i++) {
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47 int rc;
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48 char *try = toys.optargs[i];
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49
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50 if (S_ISDIR(buf.st_mode)) new = xmsprintf("%s/%s", dest, basename(try));
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51 else new = dest;
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52 /* Silently unlink the existing target. If it doesn't exist,
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53 * then we just move on */
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54 if (toys.optflags & FLAG_f) unlink(new);
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55
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56 rc = (toys.optflags & FLAG_s) ? symlink(try, new) : link(try, new);
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57 if (rc)
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58 perror_exit("cannot create %s link from '%s' to '%s'",
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59 (toys.optflags & FLAG_s) ? "symbolic" : "hard", try, new);
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60 if (new != dest) free(new);
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61 }
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62 }