sys: Add `isgraph()` to <sys/ctype.h>

Quote from https://pubs.opengroup.org/onlinepubs/7908799/xbd/locale.html:

    "graph": Define characters to be classified as printable characters,
    not including the space character.

Reviewed by:	emaste
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D57578

1 files changed, 6 insertions, 0 deletions

diff --git a/sys/sys/ctype.h b/sys/sys/ctype.h
index effb549b40f8..2e5827cc02f9 100644
--- a/sys/sys/ctype.h
+++ b/sys/sys/ctype.h
@@ -88,6 +88,12 @@ isprint(int c)
 }
 
 static __inline int
+isgraph(int c)
+{
+	return (c != ' ' && isprint(c));
+}
+
+static __inline int
 toupper(int c)
 {
 	return (c - 0x20 * ((c >= 'a') && (c <= 'z')));