Re: gtags cannot generate more than 2G files

Hi Iwamoto-san,

A couple of comments on the patch inline.

Hideki IWAMOTO <[email protected]> writes:

> Index: configure.ac
> ===================================================================
> RCS file: /sources/global/global/configure.ac,v
> retrieving revision 1.195
> diff -u -p -r1.195 configure.ac
> --- configure.ac	15 May 2017 06:15:00 -0000	1.195
> +++ configure.ac	27 Sep 2017 13:34:53 -0000
> @@ -115,6 +115,8 @@ AC_CHECK_SIZEOF(char)
>  if test ${ac_cv_sizeof_char} != 1; then
>  	AC_MSG_ERROR([Char size isn't 8 bit.])
>  fi
> +AC_CHECK_SIZEOF(long)
> +AC_CHECK_SIZEOF(off_t)

I think this hunk isn't needed. More below...

>  
>  dnl Checks for library functions.
>  AC_FUNC_ALLOCA
> Index: libdb/mpool.c
> ===================================================================
> RCS file: /sources/global/global/libdb/mpool.c,v
> retrieving revision 1.8
> diff -u -p -r1.8 mpool.c
> --- libdb/mpool.c	13 Oct 2012 07:01:21 -0000	1.8
> +++ libdb/mpool.c	27 Sep 2017 13:34:53 -0000
> @@ -229,7 +229,11 @@ mpool_get(mp, pgno, flags)
>  #ifdef STATISTICS
>  	++mp->pageread;
>  #endif
> +#if SIZEOF_OFF_T > SIZEOF_LONG
> +	off = (off_t)mp->pagesize * (off_t)pgno;

There is no need to cast both the operands. Casting any one of the
operands is sufficient to promote the other.

Also, it would be helpful to have a comment explaining the reason for
the cast.

> +#else
>  	off = mp->pagesize * pgno;
> +#endif

I think you can drop the #if checks and always cast unconditionally. It
is redundant if the sizeof(long) == sizeof(off_t) but it get's rid of
the #if..#else..#endif block.

It also removes the need for the configure.ac hunk above.

>  #ifdef HAVE_PREAD
>  	if ((nr = pread(mp->fd, bp->page, mp->pagesize, off)) != mp->pagesize) {
>  		if (nr >= 0)
> @@ -425,7 +429,11 @@ mpool_write(mp, bp)
>  	if (mp->pgout)
>  		(mp->pgout)(mp->pgcookie, bp->pgno, bp->page);
>  
> +#if SIZEOF_OFF_T > SIZEOF_LONG
> +	off = (off_t)mp->pagesize * (off_t)bp->pgno;
> +#else
>  	off = mp->pagesize * bp->pgno;
> +#endif

Same comment as above.

Thanks,
Punit

>  #ifdef HAVE_PWRITE
>  	if (pwrite(mp->fd, bp->page, mp->pagesize, off) != mp->pagesize)
>  		return (RET_ERROR);
>
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