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ctype.h: remove duplicate isdigit() helper

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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: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2020-10-19 09:35:39 +02:00
parent f44ca0871b
commit caabdd0f59
2 changed files with 22 additions and 4 deletions
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11
include/linux/compiler_types.h
View file

@ -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>

15
include/linux/ctype.h
View file

@ -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))