Add isblank

Existing ctype checks are implemented using a 256 byte lookup table,
allowing each character to be in any of 8 character classes. Since there
are 8 existing character classes without the blank class, I implemented
isblank without using the lookup table.  Since there are only two blank
characters - tab and space - this is a more reasonable approach than
doubling the size of the lookup table to accommodate one more class.

Signed-off-by: Jason Hobbs <jason.hobbs@calxeda.com>

diff --git a/include/linux/ctype.h b/include/linux/ctype.h
index 6dec944a370b23d983c285002c652741dd698b53..42f9305a0280e9909d6edcd95f007ad3125fc2f0 100644 (file)
--- a/include/linux/ctype.h
+++ b/include/linux/ctype.h
@@ -31,6 +31,12 @@ extern const unsigned char _ctype[];
 #define isupper(c)     ((__ismask(c)&(_U)) != 0)
 #define isxdigit(c)    ((__ismask(c)&(_D|_X)) != 0)
 
+/*
+ * Rather than doubling the size of the _ctype lookup table to hold a 'blank'
+ * flag, just check for space or tab.
+ */
+#define isblank(c)     (c == ' ' || c == '\t')
+
 #define isascii(c) (((unsigned char)(c))<=0x7f)
 #define toascii(c) (((unsigned char)(c))&0x7f)