sbase

commit d6b3890af618511a4930cf4c6cc8b72a4c767769
parent 49ed53b46cfe2fbb48bd61f643e3856193298b86
Author: FRIGN <dev@frign.de>
Date:   Mon,  9 Feb 2015 00:41:57 +0100

Add r-flag to touch(1), refactor manpage and code

and mark it as finished in README.

Diffstat:
M
README
 | 
2
+-
M
touch.1
 | 
50
++++++++++++++++++++++++++++++++++++--------------
M
touch.c
 | 
10
+++++++++-

3 files changed, 46 insertions(+), 16 deletions(-)
diff --git a/README b/README
@@ -68,7 +68,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =* tar             non-posix                    none
 =* tee             yes                          none
    test            yes                          none
-=  touch           no                           -r
+=* touch           yes                          none
 #* tr              yes                          none
 =* true            yes                          none
 =* tty             yes                          none
diff --git a/touch.1 b/touch.1
@@ -1,4 +1,4 @@
-.Dd January 20, 2014
+.Dd February 9, 2014
 .Dt TOUCH 1
 .Os sbase
 .Sh NAME
@@ -7,25 +7,47 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl acm
-.Op Fl t Ar stamp
+.Op Fl r Ar ref_file | t Ar timestamp
 .Ar file ...
 .Sh DESCRIPTION
 .Nm
-sets the access and modification times of files to the current time of day. If
-the file doesn't exist, it is created with the default permissions.
+sets the access or modification time of each
+.Ar file
+to the current time of day. If
+.Ar file
+doesn't exist, it is created with default permissions.
 .Sh OPTIONS
 .Bl -tag -width Ds
-.It Fl a
-Set the access time of the file.
+.It Fl a | Fl m
+Set the access | modification time of
+.Ar file.
 .It Fl c
-Do not create the file it it does not exist. The exit status is not affected.
-.It Fl m
-Change the modification time of the file.
-.It Fl t Ar stamp
-Set the timestamp to be used with
-.Op Fl am .
-The format of the timestamp is simply the number of seconds since Jan 1, 1970.
-This specification of time does not conform to POSIX.
+Don't create
+.Ar file
+if it doesn't exist, not affecting exit status.
+.It Fl r Ar ref_file
+Set the timestamp
+to be used with
+.Op Fl am
+to the modification time of
+.Ar ref_file .
+.It Fl t Ar timestamp
+Set the
+.Ar timestamp
+to be used with
+.Op Fl am
+given as the number of seconds since the
+Unix epoch 1970-01-01T00:00:00Z.
 .El
 .Sh SEE ALSO
 .Xr date 1
+.Sh STANDARDS
+The
+.Nm
+utility is compliant with the
+.St -p1003.1-2008
+specification except from the
+.Ar timestamp
+format of the
+.Fl t
+flag.
diff --git a/touch.c b/touch.c
@@ -46,12 +46,14 @@ touch(const char *file)
 static void
 usage(void)
 {
-	eprintf("usage: %s [-acm] [-t stamp] file ...\n", argv0);
+	eprintf("usage: %s [-acm] [-r ref_file | -t timestamp] file ...\n", argv0);
 }
 
 int
 main(int argc, char *argv[])
 {
+	struct stat st;
+	char *ref;
 	t = time(NULL);
 
 	ARGBEGIN {
@@ -64,6 +66,12 @@ main(int argc, char *argv[])
 	case 'm':
 		mflag = 1;
 		break;
+	case 'r':
+		ref = EARGF(usage());
+		if (stat(ref, &st) < 0)
+			eprintf("stat '%s':", ref);
+		t = st.st_mtime;
+		break;
 	case 't':
 		t = estrtonum(EARGF(usage()), 0, MIN(LLONG_MAX, (time_t)-1));
 		break;