[U-Boot-Users] printf question

[Wolfgang Denk]

In message <54305.216.110.51.8.1080245554.squirrel at www.orkun.us> you wrote:
>
> > But we agree that the conversion "unsigned char" ==>  "unsigned  int"
> > must result in exactly the same result, no matter if done implicitely
> > or by explicit cast?
...
> I agree, unsigned char should be promoted to unsigned int.

Must, not should.

> However, char can be unsigned or signed depending on the platform. On a

But the variable in question  was  of  type  "unsigned  char",  which
leaves no room for implementation-specific behaviour.

> before passing it to printf. So, a value like 0xC2 (-62 as 8-bit value)

We are talking about a format element which expects an "unsigned int"
argument, and an "unsigned char"  argument.  There  was  no  constant
expression involved.

> with twos complement arithmetic. %02X can only suppress leaving zeros so
> additional f's will be printed.

Oops? %02X will _add_ leading zeroes if the result is too short,  but
it will never supress anything.

[Maybe we should take this to c.l.c ;-)]

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
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