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Date: Sun, 25 Sep 2011 08:41:18 -0400
From: pete <pfiland@mindspring.com>
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Subject: Re: A very simple parser with scanf & C
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.c:10915

Gene wrote:
 
> /*
>  * Convert a character to lower case.
>  */
> char lowercase(char c)
> {
>   return ('A' <= c && c <= 'Z') ? c - 'A' + 'a' : c;
> }

That's not 100% portable.
At least it won't work with EBCDIC.
http://en.wikipedia.org/wiki/Extended_Binary_Coded_Decimal_Interchange_Code

#include <limits.h>
#include <string.h>

#define UPPER   "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#define LOWER   "abcdefghijklmnopqrstuvwxyz"

int to_lower(int c) 
{
    const char *lower;
    const char *const upper = UPPER;

    lower = CHAR_MAX >= c && c > '\0' ? strchr(upper, c) : NULL;
    return lower != NULL ? LOWER[lower - upper] : c;
}


-- 
pete