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1204c77f9b
Make isdigit into a simple range checking inline function: return '0' <= c && c <= '9'; This code is 1 branch, not 2 because any reasonable compiler can optimize this code into SUB+CMP, so the code while (isdigit((c = *s++))) ... remains 1 branch per iteration HOWEVER it suddenly doesn't do table lookup priming cacheline nobody cares about. Link: http://lkml.kernel.org/r/20160826190047.GA12536@p183.telecom.by Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
#ifndef _LINUX_CTYPE_H
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#define _LINUX_CTYPE_H
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/*
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* NOTE! This ctype does not handle EOF like the standard C
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* library is required to.
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*/
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#define _U 0x01 /* upper */
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#define _L 0x02 /* lower */
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#define _D 0x04 /* digit */
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#define _C 0x08 /* cntrl */
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#define _P 0x10 /* punct */
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#define _S 0x20 /* white space (space/lf/tab) */
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#define _X 0x40 /* hex digit */
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#define _SP 0x80 /* hard space (0x20) */
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extern const unsigned char _ctype[];
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#define __ismask(x) (_ctype[(int)(unsigned char)(x)])
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#define isalnum(c) ((__ismask(c)&(_U|_L|_D)) != 0)
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#define isalpha(c) ((__ismask(c)&(_U|_L)) != 0)
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#define iscntrl(c) ((__ismask(c)&(_C)) != 0)
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static inline int isdigit(int c)
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{
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return '0' <= c && c <= '9';
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}
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#define isgraph(c) ((__ismask(c)&(_P|_U|_L|_D)) != 0)
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#define islower(c) ((__ismask(c)&(_L)) != 0)
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#define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
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#define ispunct(c) ((__ismask(c)&(_P)) != 0)
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/* Note: isspace() must return false for %NUL-terminator */
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#define isspace(c) ((__ismask(c)&(_S)) != 0)
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#define isupper(c) ((__ismask(c)&(_U)) != 0)
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#define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)
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#define isascii(c) (((unsigned char)(c))<=0x7f)
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#define toascii(c) (((unsigned char)(c))&0x7f)
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static inline unsigned char __tolower(unsigned char c)
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{
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if (isupper(c))
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c -= 'A'-'a';
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return c;
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}
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static inline unsigned char __toupper(unsigned char c)
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{
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if (islower(c))
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c -= 'a'-'A';
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return c;
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}
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#define tolower(c) __tolower(c)
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#define toupper(c) __toupper(c)
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/*
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* Fast implementation of tolower() for internal usage. Do not use in your
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* code.
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*/
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static inline char _tolower(const char c)
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{
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return c | 0x20;
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}
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/* Fast check for octal digit */
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static inline int isodigit(const char c)
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{
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return c >= '0' && c <= '7';
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}
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#endif
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