Commit caabdd0f authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

ctype.h: remove duplicate isdigit() helper 



gcc warns a few thousand times about the isdigit() shadow:

include/linux/ctype.h:26:19: warning: declaration of 'isdigit' shadows a built-in function [-Wshadow]

As there is already a compiler builtin, just use that, and make
it clear we do that by defining a macro.  Unfortunately, clang
does not have the isdigit() builtin, so this has to be conditional.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent f44ca087

include/linux/compiler_types.h

+11 −0
Original line number Diff line number Diff line
@@ -64,6 +64,17 @@ static inline void __chk_io_ptr(const volatile void __iomem *ptr) { } 
/* Attributes */

#include <linux/compiler_attributes.h>



/* Builtins */



/*

 * __has_builtin is supported on gcc >= 10, clang >= 3 and icc >= 21.

 * In the meantime, to support gcc < 10, we implement __has_builtin

 * by hand.

 */

#ifndef __has_builtin

#define __has_builtin(x) (0)

#endif



/* Compiler specific macros. */

#ifdef __clang__

#include <linux/compiler-clang.h>

include/linux/ctype.h

+11 −4
Original line number Diff line number Diff line
@@ -2,6 +2,8 @@ 
#ifndef _LINUX_CTYPE_H

#define _LINUX_CTYPE_H



#include <linux/compiler.h>



/*

 * NOTE! This ctype does not handle EOF like the standard C

 * library is required to.
@@ -23,10 +25,6 @@ extern const unsigned char _ctype[]; 
#define isalnum(c)	((__ismask(c)&(_U|_L|_D)) != 0)

#define isalpha(c)	((__ismask(c)&(_U|_L)) != 0)

#define iscntrl(c)	((__ismask(c)&(_C)) != 0)

static inline int isdigit(int c)

{

	return '0' <= c && c <= '9';

}

#define isgraph(c)	((__ismask(c)&(_P|_U|_L|_D)) != 0)

#define islower(c)	((__ismask(c)&(_L)) != 0)

#define isprint(c)	((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
@@ -39,6 +37,15 @@ static inline int isdigit(int c) 
#define isascii(c) (((unsigned char)(c))<=0x7f)

#define toascii(c) (((unsigned char)(c))&0x7f)



#if __has_builtin(__builtin_isdigit)

#define  isdigit(c) __builtin_isdigit(c)

#else

static inline int isdigit(int c)

{

	return '0' <= c && c <= '9';

}

#endif



static inline unsigned char __tolower(unsigned char c)

{

	if (isupper(c))

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