Mercurial > hg > toybox
annotate toys/posix/ln.c @ 1144:58daf9c9a0b1 draft
ln -v support from Ashwini Sharma (comment tweak from me)
author | Rob Landley <rob@landley.net> |
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date | Wed, 18 Dec 2013 10:25:02 -0600 |
parents | 3d7526f6115b |
children | 0752b2d58909 |
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1 /* ln.c - Create filesystem links |
461 | 2 * |
3 * Copyright 2012 Andre Renaud <andre@bluewatersys.com> | |
4 * | |
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/ln.html |
461 | 6 |
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7 USE_LN(NEWTOY(ln, "<1vnfs", TOYFLAG_BIN)) |
461 | 8 |
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 [-sfnv] [FROM...] TO |
461 | 14 |
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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. |
461 | 17 |
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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 -v Verbose |
461 | 22 */ |
23 | |
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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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24 #define FOR_ln |
461 | 25 #include "toys.h" |
26 | |
27 void ln_main(void) | |
28 { | |
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29 char *dest = toys.optargs[--toys.optc], *new; |
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30 struct stat buf; |
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31 int i; |
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32 |
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33 // With one argument, create link in current directory. |
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34 if (!toys.optc) { |
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35 toys.optc++; |
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36 dest="."; |
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37 } |
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38 |
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39 // Is destination a directory? |
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40 if (((toys.optflags&FLAG_n) ? lstat : stat)(dest, &buf) |
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41 || !S_ISDIR(buf.st_mode)) |
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42 { |
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43 if (toys.optc>1) error_exit("'%s' not a directory"); |
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44 buf.st_mode = 0; |
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45 } |
461 | 46 |
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47 for (i=0; i<toys.optc; i++) { |
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48 int rc; |
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49 char *try = toys.optargs[i]; |
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50 |
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51 if (S_ISDIR(buf.st_mode)) new = xmsprintf("%s/%s", dest, basename(try)); |
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52 else new = dest; |
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53 // Silently unlink the existing target (if any) |
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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 else if (toys.optflags & FLAG_v) |
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61 fprintf(stderr, "'%s' -> '%s'\n", new, try); |
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62 if (new != dest) free(new); |
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63 } |
461 | 64 } |