Re: [PATCH] Replace memcpy with hashcpy when dealing hash copy globally

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On Sat, Mar 1, 2014 at 8:07 AM, Sun He <sunheehnus@xxxxxxxxx> wrote:
> Signed-off-by: Sun He <sunheehnus@xxxxxxxxx>
> ---
>  Find the potential places with memcpy by the bash command:
>    $ find . | xargs grep "memcpy.*\(.*20.*\)"
>
>  Helped-by: Michael Haggerty<mhagger@xxxxxxxxxxxx>

You may want to put this Helped-by before "---" because it's supposed
to end up in the final commit. The patch looks straightforward,
except..

> diff --git a/ppc/sha1.c b/ppc/sha1.c
> index ec6a192..8a87fea 100644
> --- a/ppc/sha1.c
> +++ b/ppc/sha1.c
> @@ -9,6 +9,7 @@
>  #include <stdio.h>
>  #include <string.h>
>  #include "sha1.h"
> +#include "cache.h"
>
>  extern void ppc_sha1_core(uint32_t *hash, const unsigned char *p,
>                           unsigned int nblocks);
> @@ -67,6 +68,6 @@ int ppc_SHA1_Final(unsigned char *hash, ppc_SHA_CTX *c)
>                 memset(&c->buf.b[cnt], 0, 56 - cnt);
>         c->buf.l[7] = c->len;
>         ppc_sha1_core(c->hash, c->buf.b, 1);
> -       memcpy(hash, c->hash, 20);
> +       hashcpy(hash, c->hash);
>         return 0;
>  }

cache.h (actually git-compat-util.h that cache.h includes) messes
around with system headers by defining this and that macro. The
general rule is if cache.h or git-compat-util.h is included, it's the
first #include, and system includes will be always in
git-compat-util.h (grep '^#include' shows this). Maybe it's best to
leave this memcpy alone (and if you do, state so in the commit message
with the reason).
-- 
Duy
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