https://github.com/torvalds/linux
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Tip revision: 39a8804455fb23f09157341d3ba7db6d7ae6ee76 authored by Linus Torvalds on 12 April 2015, 22:12:50 UTC
Linux 4.0
Tip revision: 39a8804
ctype.h
#ifndef BOOT_CTYPE_H
#define BOOT_CTYPE_H

static inline int isdigit(int ch)
{
	return (ch >= '0') && (ch <= '9');
}

static inline int isxdigit(int ch)
{
	if (isdigit(ch))
		return true;

	if ((ch >= 'a') && (ch <= 'f'))
		return true;

	return (ch >= 'A') && (ch <= 'F');
}

#endif
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