getfacl: add some long options for Linux compatibility

Only three of our options have compatible looking long options, w.r.t.
the commonly provided getfacl(1) on Linux systems.  Of particular
interest is --omit-header, which is -c on !FreeBSD and -q on FreeBSD.

Reviewed by:	imp, markj
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D40602

bin/getfacl/getfacl.1

@@ -28,7 +28,7 @@
 .\" Developed by the TrustedBSD Project.
 .\" Support for POSIX.1e access control lists.
 .\"
-.Dd September 4, 2009
+.Dd June 19, 2023
 .Dt GETFACL 1
 .Os
 .Sh NAME
@@ -54,7 +54,7 @@ an ACL containing only the required ACL entries.
 .Pp
 The following option is available:
 .Bl -tag -width indent
-.It Fl d
+.It Fl d , Fl -default
 The operation applies to the default ACL of a directory instead of the
 access ACL.
 An error is generated if a default ACL cannot be associated with
@@ -67,11 +67,11 @@ the symbolic link itself rather than following the link.
 For NFSv4 ACLs, append numerical ID at the end of each entry containing
 user or group name.
 Ignored for POSIX.1e ACLs.
-.It Fl n
+.It Fl n , Fl -numeric
 Display user and group IDs numerically rather than converting to
 a user or group name.
 Ignored for POSIX.1e ACLs.
-.It Fl q
+.It Fl q , Fl -omit-header
 Do not write commented information about file name and ownership.
 This is
 useful when dealing with filenames with unprintable characters.

bin/getfacl/getfacl.c

@@ -37,6 +37,7 @@
 
 #include <err.h>
 #include <errno.h>
+#include <getopt.h>
 #include <grp.h>
 #include <pwd.h>
 #include <stdio.h>
@@ -46,6 +47,14 @@
 
 static int more_than_one = 0;
 
+static const struct option long_options[] =
+{
+	{ "default",		no_argument,	NULL,	'd' },
+	{ "numeric",		no_argument,	NULL,	'n' },
+	{ "omit-header",	no_argument,	NULL,	'q' },
+	{ NULL,			no_argument,	NULL,	0 },
+};
+
 static void
 usage(void)
 {
@@ -197,7 +206,8 @@ main(int argc, char *argv[])
 	qflag = 0;
 	nflag = 0;
 	vflag = 0;
-	while ((ch = getopt(argc, argv, "dhinqv")) != -1)
+	while ((ch = getopt_long(argc, argv, "+dhinqv", long_options,
+	    NULL)) != -1)
 		switch(ch) {
 		case 'd':
 			type = ACL_TYPE_DEFAULT;