[U-Boot] [PATCH v4 04/13] Add isblank

[Jason Hobbs]

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 at calxeda.com>
---
new in v4

 include/linux/ctype.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/include/linux/ctype.h b/include/linux/ctype.h
index 6dec944..42f9305 100644
--- 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)
 
-- 
1.7.0.4