GitHub-Mirror/u-boot
2
0
Fork 0
mirror of https://github.com/Fishwaldo/u-boot.git synced 2025-03-21 22:51:37 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Add isblank

Browse source 
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>
This commit is contained in:
Jason Hobbs 2011-08-23 11:06:52 +00:00 • committed by Wolfgang Denk
parent c8a2079e49
commit 93337abbfe
1 changed files with 6 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
include/linux/ctype.h
View file

@ -31,6 +31,12 @@ extern const unsigned char _ctype[];
#define isupper(c) ((__ismask(c)&(_U)) != 0) #define isupper(c) ((__ismask(c)&(_U)) != 0)
#define isxdigit(c) ((__ismask(c)&(_D|_X)) != 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 isascii(c) (((unsigned char)(c))<=0x7f)
#define toascii(c) (((unsigned char)(c))&0x7f) #define toascii(c) (((unsigned char)(c))&0x7f)