[patch] save ~600B

[Rob Landley]

On Monday 05 June 2006 8:08 am, walter harms wrote:
> personally i am the fan of
>    exit( EXIT_FAILURE ) ;

Unix-like systems have returned at least 8 bit error codes with 0 meaning 
success and nonzero meaning failure since 1970.  (In 1969, it was 6 bit. :P)  
This was copied by DOS, Windows, OS/2, you name it.  Any system that can't 
handle that is one that BusyBox should not even attempt to support.

Also, filehandles 0, 1, and 2 are stdin, stdout, and stderr respectively, and 
a null pointer is 0, and FALSE is 0, and any nonzero value is true.  
(Although if they define a TRUE macro it could be 1 or -1 since -1 is all 
bits set so it makes a certain amount of sense.  You can trust our ENABLE 
values to be 1 if they're true, though.)

char defaults to unsigned (because we hit the compiler on the head with a 
HAMMER, that's why).  Integer arithmetic uses ones' complement notation.  We 
restrict our use of floating point as much as possible and have config 
options around any uses of it such as "sort".

Busybox trusts that the c99 types for uint8_t, uint16_t, uint32_t, and 
uint64_t are all available, plus the corresponding signed ones.  You can also 
use c99 // comments.  Our compiler must be capable of doing dead code 
elimination and simple local constant propagation.  It's not currently 
merging duplicate strings or eliminating unused static functions, which is 
sad.

Rob
-- 
Never bet against the cheap plastic solution.