Carlo Marcelo Arenas Belón <carenas@xxxxxxxxx> writes:
> this macro is commonly defined in system headers (usually <sys/param.h>)
> but if it is not define it here so it can be used elsewhere
>
> Signed-off-by: Carlo Marcelo Arenas Belón <carenas@xxxxxxxxx>
> ---
I am between "meh" and "moderately negative" on this change.
- Definition of MIN without matching MAX makes me worried about
longer-term maintainability. If we were to add MIN() we should
also add MAX() to match.
However, "git grep -e '#define MAX(' -e '#define MIN('" tells me
that we do not use these anywhere and Brian's use of a single
MIN() is the only thing that makes this patch interesting. That
is the primary reason why I am very close to "meh" on this.
- We need to make sure that this is enough in "git-compat-util.h".
Ideally, this should be after all "#include" of the system
supplied header files, and before any use of MIN() macro
ourselves. I am reasonably sure that the place this patch chose
to insert the definition satisfies that criterion within the
context of the today's code, but I am unsure if it is even worth
having to worry about it in the first place, given how rarely if
ever the macro is used. I think Brian's reroll of the sha256
series even gets rid of the use of the macro, as it had only a
single place that used the macro anyway.
So...
> git-compat-util.h | 5 +++++
> sha256/block/sha256.c | 3 ---
> 2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/git-compat-util.h b/git-compat-util.h
> index 5f2e90932f..7a0b48452b 100644
> --- a/git-compat-util.h
> +++ b/git-compat-util.h
> @@ -218,6 +218,11 @@
> #else
> #include <stdint.h>
> #endif
> +
> +#ifndef MIN
> +#define MIN(x, y) ((x) < (y) ? (x) : (y))
> +#endif
> +
> #ifdef NO_INTPTR_T
> /*
> * On I16LP32, ILP32 and LP64 "long" is the safe bet, however
> diff --git a/sha256/block/sha256.c b/sha256/block/sha256.c
> index 0d4939cc2c..5fba943c79 100644
> --- a/sha256/block/sha256.c
> +++ b/sha256/block/sha256.c
> @@ -130,9 +130,6 @@ static void blk_SHA256_Transform(blk_SHA256_CTX *ctx, const unsigned char *buf)
> }
> }
>
> -#ifndef MIN
> -#define MIN(x, y) ((x) < (y) ? (x) : (y))
> -#endif
> void blk_SHA256_Update(blk_SHA256_CTX *ctx, const void *data, size_t len)
> {
> const unsigned char *in = data;
