函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:include\linux\ctype.h Create Date:2022-07-27 06:37:58
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#define __ismask(x) (_ctype[(int)(unsigned char)(x)])
 
#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';
}