https://github.com/torvalds/linux
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Tip revision: 521cb40b0c44418a4fd36dc633f575813d59a43d authored by Linus Torvalds on 15 March 2011, 01:20:32 UTC
Linux 2.6.38
Tip revision: 521cb40
ctype.h
#ifndef BOOT_ISDIGIT_H

#define BOOT_ISDIGIT_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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