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authorAndré Goddard Rosa <andre.goddard@gmail.com>2009-12-14 18:01:04 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:32 -0800
commitf653398c86a1c104f0992bd788dd4bb065449be4 (patch)
tree69cd79aaca48c2e1bdf9a48b968772347dbd5df2 /include/linux/ctype.h
parent4e62b0930223fe2f61094ceb1bbb31b3fe4251c2 (diff)
string: factorize skip_spaces and export it to be generally available
On the following sentence: while (*s && isspace(*s)) s++; If *s == 0, isspace() evaluates to ((_ctype[*s] & 0x20) != 0), which evaluates to ((0x08 & 0x20) != 0) which equals to 0 as well. If *s == 1, we depend on isspace() result anyway. In other words, "a char equals zero is never a space", so remove this check. Also, *s != 0 is most common case (non-null string). Fixed const return as noticed by Jan Engelhardt and James Bottomley. Fixed unnecessary extra cast on strstrip() as noticed by Jan Engelhardt. Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/ctype.h')
-rw-r--r--include/linux/ctype.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ctype.h b/include/linux/ctype.h
index 6dec944a370b..a3d6ee0044f9 100644
--- a/include/linux/ctype.h
+++ b/include/linux/ctype.h
@@ -27,6 +27,7 @@ extern const unsigned char _ctype[];
#define islower(c) ((__ismask(c)&(_L)) != 0)
#define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
#define ispunct(c) ((__ismask(c)&(_P)) != 0)
+/* Note: isspace() must return false for %NUL-terminator */
#define isspace(c) ((__ismask(c)&(_S)) != 0)
#define isupper(c) ((__ismask(c)&(_U)) != 0)
#define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)