units(1): add long options

	Things brings additional compatibility with units 2.10

Discussed with:	wblock (man page)

2 files changed, 17 insertions, 7 deletions

diff --git a/usr.bin/units/units.1 b/usr.bin/units/units.1
index dff0f58..f971d9c 100644
--- a/usr.bin/units/units.1
+++ b/usr.bin/units/units.1
@@ -13,17 +13,19 @@
 .Sh OPTIONS
 The following options are available:
 .Bl -tag -width indent
-.It Fl f Ar filename
+.It Fl f Ar filename No , Fl -file Ar filename
 Specify the name of the units data file to load.
-.It Fl q
+.It Fl q No , Fl -quiet
 Suppress prompting of the user for units and the display of statistics
 about the number of units loaded.
-.It Fl U
+.It Fl U No , Fl -unitsfile
 If the default unit file exists prints its location.  If not, print
 .Qo
 Units data file not found
 .Qc
-.It Fl V
+.It Fl v No , Fl -verbose
+Print the units in the conversion output.  Be more verbose in general.
+.It Fl V No , Fl -version
 Print the version number, usage, and then exit.
 .It Ar from-unit to-unit
 Allow a single unit conversion to be done directly from the command
@@ -31,8 +33,6 @@ line.
 The program will not print prompts.
 It will print out the
 result of the single specified conversion.
-.It Fl v
-Print the units in the conversion output.  Be more verbose in general.
 .El
 .Sh DESCRIPTION
 The
diff --git a/usr.bin/units/units.c b/usr.bin/units/units.c
index be52adf7..a0e3772 100644
--- a/usr.bin/units/units.c
+++ b/usr.bin/units/units.c
@@ -24,6 +24,7 @@ static const char rcsid[] =
 #include <err.h>
 #include <errno.h>
 #include <histedit.h>
+#include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -702,6 +703,15 @@ usage(void)
 	exit(3);
 }
 
+static struct option longopts[] = {
+	{"file", required_argument, NULL, 'f'},
+	{"quiet", no_argument, NULL, 'q'},
+	{"verbose", no_argument, NULL, 'v'},
+	{"unitsfile", no_argument, NULL, 'U'},
+	{"version", no_argument, NULL, 'V'},
+	{ 0, 0, 0, 0 }
+};
+
 
 int
 main(int argc, char **argv)
@@ -718,7 +728,7 @@ main(int argc, char **argv)
 
 	quiet = false;
 	readfile = false;
-	while ((optchar = getopt(argc, argv, "f:qvUV")) != -1) {
+	while ((optchar = getopt_long(argc, argv, "+f:qvUV", longopts, NULL)) != -1) {
 		switch (optchar) {
 		case 'f':
 			readfile = true;