1 /* readlink.c - Return string representation of a symbolic link.
2  *
3  * Copyright 2007 Rob Landley <rob@landley.net>
4 
5 USE_READLINK(NEWTOY(readlink, "<1nqmef(canonicalize)[-mef]", TOYFLAG_USR|TOYFLAG_BIN))
6 
7 config READLINK
8   bool "readlink"
9   default y
10   help
11     usage: readlink FILE...
12 
13     With no options, show what symlink points to, return error if not symlink.
14 
15     Options for producing canonical paths (all symlinks/./.. resolved):
16 
17     -e	Canonical path to existing entry (fail if missing)
18     -f	Full path (fail if directory missing)
19     -m	Ignore missing entries, show where it would be
20     -n	No trailing newline
21     -q	Quiet (no output, just error code)
22 */
23 
24 #define FOR_readlink
25 #include "toys.h"
26 
27 void readlink_main(void)
28 {
29   char **arg, *s;
30 
31   for (arg = toys.optargs; *arg; arg++) {
32     // Calculating full canonical path?
33     // Take advantage of flag positions to calculate m = -1, f = 0, e = 1
34     if (toys.optflags & (FLAG_f|FLAG_e|FLAG_m))
35       s = xabspath(*arg, (toys.optflags&(FLAG_f|FLAG_e))-1);
36     else s = xreadlink(*arg);
37 
38     if (s) {
39       if (!FLAG(q)) xprintf(FLAG(n) ? "%s" : "%s\n", s);
40       if (CFG_TOYBOX_FREE) free(s);
41     } else toys.exitval = 1;
42   }
43 }
44