I'll add that both gcc and VC do a nice job of compiling this for x86:
almostt identical code, 35 instructions in 88 bytes.
An issue with the ctype.h functions - again only important in tight
environments - is that some implementations use tables that are 1024
bytes.
On Sep 1, 5:55 pm, Gene <gene.ress...@gmail.com> wrote:
> The language does give it tyou in sscanf, but sscanf is a pretty big
> function and in some environments, like small embedded ones, you don't
> get the luxury of using a big block of code to do a small thing.
>
> unsigned hex_to_unsigned(char *p)
> {
> unsigned val = 0;
> while (*p != '\0') {
> char c = *p++;
> if ('a' <= c && c <= 'f')
> val = (val << 4) + (c - 'a' + 10);
> else if ('A' <= c && c <= 'F')
> val = (val << 4) + (c - 'A' + 10);
> else if ('0' <= c && c <= '9')
> val = (val << 4) + (c - '0');
> else break; // quit early on non-hex char
> }
> return val;
>
> }
>
> On Sep 1, 12:34 pm, rShetty <rajeevr...@gmail.com> wrote:
>
>
>
> > Given a Hexadecimal value as a string, give a C Code to convert it
> > into decimal value?
> > If 0xff then output should be 255.
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