1 /* readlink.c - Return string representation of a symbolic link.
2 *
3 * Copyright 2007 Rob Landley <rob@landley.net>
4
5 // -ef positions match ABS_FILE ABS_PATH
6 USE_READLINK(NEWTOY(readlink, "<1nqmef(canonicalize)[-mef]", TOYFLAG_USR|TOYFLAG_BIN))
7 USE_REALPATH(OLDTOY(realpath, readlink, TOYFLAG_USR|TOYFLAG_BIN))
8
9 config READLINK
10 bool "readlink"
11 default y
12 help
13 usage: readlink FILE...
14
15 With no options, show what symlink points to, return error if not symlink.
16
17 Options for producing canonical paths (all symlinks/./.. resolved):
18
19 -e Canonical path to existing entry (fail if missing)
20 -f Full path (fail if directory missing)
21 -m Ignore missing entries, show where it would be
22 -n No trailing newline
23 -q Quiet (no output, just error code)
24
25 config REALPATH
26 bool "realpath"
27 default y
28 help
29 usage: realpath FILE...
30
31 Display the canonical absolute pathname
32 */
33
34 #define FOR_readlink
35 #define FORCE_FLAGS
36 #include "toys.h"
37
readlink_main(void)38 void readlink_main(void)
39 {
40 char **arg, *s;
41
42 if (toys.which->name[3]=='l') toys.optflags |= FLAG_f;
43 for (arg = toys.optargs; *arg; arg++) {
44 // Calculating full canonical path?
45 // Take advantage of flag positions: m = 0, f = ABS_PATH, e = ABS_FILE
46 if (toys.optflags & (FLAG_f|FLAG_e|FLAG_m))
47 s = xabspath(*arg, toys.optflags&(FLAG_f|FLAG_e));
48 else s = xreadlink(*arg);
49
50 if (s) {
51 if (!FLAG(q)) xprintf("%s%s", s, (FLAG(n) && !arg[1]) ? "" : "\n");
52 free(s);
53 } else toys.exitval = 1;
54 }
55 }
56