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<title>
todigit.c
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<pre>
/*====================================================================*
*
* unsigned todigit (unsigned c);
*
* number.h
*
* return the unsigned integer equivalent of an ASCII digit or the
* value UCHAR_MAX on error;
*
* Motley Tools by Charles Maier <cmaier@cmassoc.net>;
* Copyright (c) 2001-2006 by Charles Maier Associates;
* Licensed under the Internet Software Consortium License;
*
*--------------------------------------------------------------------*/
#ifndef TODIGIT_SOURCE
#define TODIGIT_SOURCE
#include <limits.h>
#include "../tools/number.h"
unsigned todigit (unsigned c)
{
if ((c >= '0') && (c <= '9'))
{
return (c - '0');
}
if ((c >= 'A') && (c <= 'Z'))
{
return (c - 'A' + 10);
}
if ((c >= 'a') && (c <= 'z'))
{
return (c - 'a' + 10);
}
return (UCHAR_MAX);
}
#endif
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