look: implement long options

	gentoo has "util-linux 2.24.1" with long options.  Other distributions
	have similar.

	usage() is intentionally unchanged to keep it short and sweet

Reviewed by:	jmg
Discussed with:	adrian, jilles

2 files changed, 16 insertions, 5 deletions

diff --git a/usr.bin/look/look.1 b/usr.bin/look/look.1
index 471898f..e6f70bb 100644
--- a/usr.bin/look/look.1
+++ b/usr.bin/look/look.1
@@ -63,12 +63,12 @@ alphabetic characters is ignored.
 .Pp
 The following options are available:
 .Bl -tag -width indent
-.It Fl d
+.It Fl d , -alphanum
 Dictionary character set and order, i.e., only alphanumeric characters
 are compared.
-.It Fl f
+.It Fl f , -ignore-case
 Ignore the case of alphabetic characters.
-.It Fl t
+.It Fl t , -terminate Ar termchar
 Specify a string termination character, i.e., only the characters
 in
 .Ar string
@@ -106,7 +106,9 @@ implementation.
 .Pp
 The
 .Fl a
-flag is ignored for compability.
+and
+.Fl -alternative
+flags are ignored for compability.
 .Sh SEE ALSO
 .Xr grep 1 ,
 .Xr sort 1
diff --git a/usr.bin/look/look.c b/usr.bin/look/look.c
index 5f830d0..ada6e25 100644
--- a/usr.bin/look/look.c
+++ b/usr.bin/look/look.c
@@ -59,6 +59,7 @@ __FBSDID("$FreeBSD$");
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <getopt.h>
 #include <limits.h>
 #include <locale.h>
 #include <stdint.h>
@@ -88,6 +89,14 @@ static void	 print_from(wchar_t *, unsigned char *, unsigned char *);
 
 static void usage(void);
 
+static struct option longopts[] = {
+	{ "alternative",no_argument,	NULL, 'a' },
+	{ "alphanum",	no_argument,	NULL, 'd' },
+	{ "ignore-case",no_argument,	NULL, 'i' },
+	{ "terminate",	required_argument, NULL, 't'},
+	{ NULL,		0,		NULL, 0 },
+};
+
 int
 main(int argc, char *argv[])
 {
@@ -102,7 +111,7 @@ main(int argc, char *argv[])
 
 	file = _path_words;
 	termchar = L'\0';
-	while ((ch = getopt(argc, argv, "adft:")) != -1)
+	while ((ch = getopt_long(argc, argv, "+adft:", longopts, NULL)) != -1)
 		switch(ch) {
 		case 'a':
 			/* COMPATIBILITY */