Allow <blank>s to be used to separate tab stop positions with the -t

argument, not just ASCII space characters and commas. Don't count
non-printing characters when determining column position.

2 files changed, 20 insertions, 3 deletions

diff --git a/usr.bin/expand/expand.1 b/usr.bin/expand/expand.1
index 99d89a0..812691f 100644
--- a/usr.bin/expand/expand.1
+++ b/usr.bin/expand/expand.1
@@ -95,6 +95,18 @@ are reconverted to maximal strings of tabs.  If the
 option is given, then tabs are inserted whenever they would compress the
 resultant file by replacing two or more characters.
 .El
+.Sh ENVIRONMENT
+The
+.Ev LANG ,
+.Ev LC_ALL
+and
+.Ev LC_CTYPE
+environment variables affect the execution of
+.Nm expand
+and
+.Nm unexpand
+as described in
+.Xr environ 7 .
 .Sh STANDARDS
 The
 .Nm expand
diff --git a/usr.bin/expand/expand.c b/usr.bin/expand/expand.c
index f83419d..e5a63c5 100644
--- a/usr.bin/expand/expand.c
+++ b/usr.bin/expand/expand.c
@@ -47,6 +47,7 @@ static const char rcsid[] =
 
 #include <ctype.h>
 #include <err.h>
+#include <locale.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -69,8 +70,11 @@ main(argc, argv)
 	register int n;
 	int rval;
 
+	setlocale(LC_CTYPE, "");
+
 	/* handle obsolete syntax */
-	while (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) {
+	while (argc > 1 && argv[1][0] == '-' &&
+	    isdigit((unsigned char)argv[1][1])) {
 		getstops(&argv[1][1]);
 		argc--; argv++;
 	}
@@ -140,7 +144,8 @@ main(argc, argv)
 
 			default:
 				putchar(c);
-				column++;
+				if (isprint(c))
+					column++;
 				continue;
 
 			case '\n':
@@ -173,7 +178,7 @@ getstops(cp)
 		tabstops[nstops++] = i;
 		if (*cp == 0)
 			break;
-		if (*cp != ',' && *cp != ' ')
+		if (*cp != ',' && !isblank((unsigned char)*cp))
 			errx(1, "bad tab stop spec");
 		cp++;
 	}