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/* readlink.c - Return string representation of a symbolic link.
*
* Copyright 2007 Rob Landley <rob@landley.net>
USE_READLINK(NEWTOY(readlink, "<1vnf(canonicalize)emqz[-mef][-qv]", TOYFLAG_USR|TOYFLAG_BIN))
USE_REALPATH(NEWTOY(realpath, "<1(relative-base):R(relative-to):s(no-symlinks)LPemqz[-Ps][-LP][-me]", TOYFLAG_USR|TOYFLAG_BIN))
config READLINK
bool "readlink"
default y
help
usage: readlink [-efmnqz] FILE...
With no options, show what symlink points to, return error if not symlink.
Options for producing canonical paths (all symlinks/./.. resolved):
-e Canonical path to existing entry (fail if missing)
-f Full path (fail if directory missing)
-m Ignore missing entries, show where it would be
-n No trailing newline
-q Quiet (no error messages)
-z NUL instead of newline
config REALPATH
bool "realpath"
default y
help
usage: realpath [-LPemqsz] [--relative-base DIR] [-R DIR] FILE...
Display the canonical absolute pathname
-R Show ../path relative to DIR (--relative-to)
-L Logical path (resolve .. before symlinks)
-P Physical path (default)
-e Canonical path to existing entry (fail if missing)
-m Ignore missing entries, show where it would be
-q Quiet (no error messages)
-s Don't expand symlinks
-z NUL instead of newline
--relative-base If path under DIR trim off prefix
*/
#define FOR_realpath
#define FORCE_FLAGS
#include "toys.h"
GLOBALS(
char *R, *relative_base;
)
// test TT.relative_base -RsmLP
// Trim .. out early for -s and -L. TODO: in place in the input string.
static char *resolve(char *arg)
{
int flags = FLAG(e) ? ABS_FILE : FLAG(m) ? 0 : ABS_PATH;
char *s, *ss = 0, *dd = 0;
if (FLAG(s)) flags |= ABS_KEEP;
else if (FLAG(L)) arg = dd = xabspath(arg, ABS_KEEP);
if (!(s = xabspath(arg, flags)) && !FLAG(q)) perror_msg_raw(arg);
free(dd);
// Trim off this prefix if path under here
if (TT.relative_base) {
ss = s;
if (strstart(&ss, TT.relative_base) && (!*ss || *ss=='/')) {
if (*ss=='/') ss++;
ss = xstrdup(!*ss ? "." : ss);
} else ss = 0;
} else if (TT.R) ss = relative_path(TT.R, s, 0);
if (ss) {
free(s);
s = ss;
}
return s;
}
// Resolve command line arguments that can't take part in their own resolution
static char *presolve(char **s)
{
char *ss = *s;
if (ss) {
*s = 0;
if (!(*s = resolve(ss))) xexit();
}
return ss;
}
// Uses realpath flag context: flags (1 = resolve, 2 = -n)
static void do_paths(int flags)
{
char **arg, *s;
if (!presolve(&TT.relative_base)) presolve(&TT.R);
for (arg = toys.optargs; *arg; arg++) {
if (!(s = (flags&1) ? resolve(*arg) : xreadlink(*arg))) toys.exitval = 1;
else xprintf(((flags&2) && !arg[1]) ? "%s" : "%s%c", s, '\n'*!FLAG(z));
free(s);
}
}
void realpath_main(void)
{
do_paths(1);
}
#define FOR_readlink
#include "generated/flags.h"
// Convert readlink flag context to realpath (feeding in -nf separately)
void readlink_main(void)
{
int nf = (toys.optflags/FLAG_f)|!!(FLAG(m)|FLAG(e));
toys.optflags &= FLAG_f-1;
if (!FLAG(v)) toys.optflags |= FLAG_q;
do_paths(nf);
}
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