# Making literal "20" symbolic

2 messages from 2006-11-20 to 2006-11-20. Participants: Andy Parkins, Junio C Hamano.
Thread: https://gitlist.dev/t/43542

## Andy Parkins, 2006-11-20 10:49

Subject: Making literal "20" symbolic
Message-ID: <200611201049.41024.andyparkins@gmail.com>
URL: https://gitlist.dev/e/200611201049.41024.andyparkins%40gmail.com

```
Hello,

I notice that there are a lot of uses of the literal 20 throughout git; I'd 
like to change them (as appropriate) to HASH_WIDTH, or similar; and maybe 
HASH_WIDTH_ASCII for the 40s.

Is there a particular header file that is appropriate to put 

#define HASH_WIDTH 20
#define HASH_WIDTH_ASCII (HASH_WIDTH*2)

Of course, I plan to review each instance to make sure I'm not changing a 
non-hash width 20.


Andy
-- 
Dr Andy Parkins, M Eng (hons), MIEE

```

## Junio C Hamano, 2006-11-20 10:54

Subject: Re: Making literal "20" symbolic
Message-ID: <7v7ixq4ccc.fsf@assigned-by-dhcp.cox.net>
URL: https://gitlist.dev/e/7v7ixq4ccc.fsf%40assigned-by-dhcp.cox.net
In-Reply-To: <200611201049.41024.andyparkins@gmail.com>

```
Andy Parkins <andyparkins@gmail.com> writes:

> I notice that there are a lot of uses of the literal 20 throughout git; I'd 
> like to change them (as appropriate) to HASH_WIDTH, or similar; and maybe 
> HASH_WIDTH_ASCII for the 40s.
>
> Is there a particular header file that is appropriate to put 
>
> #define HASH_WIDTH 20
> #define HASH_WIDTH_ASCII (HASH_WIDTH*2)
>
> Of course, I plan to review each instance to make sure I'm not changing a 
> non-hash width 20.

Probably in cache.h, close to where it defines is_null_sha1(),
hashcmp(), and friends, is the right place.

There are few places that say 42 (because we have 40-hex at the
beginning of line, followed by a single whitespace and then
something should follow so line length must be at least 42
chars), so hunting them all would be a lot of work, but I do
think this is a worthwhile cleanup.

```