[U-Boot] [PATCH] Avoid using gawk-specific strtonum()

[Tom Rini <trini@ti.com>]

On Wed, Jun 18, 2014 at 12:14:14PM -0700, Simon Glass wrote:
> Hi Tom,
> 
> On 18 June 2014 11:26, Tom Rini <trini@ti.com> wrote:
> > On Wed, Jun 18, 2014 at 12:01:12PM +0200, Wolfgang Denk wrote:
> >
> >> Dear Simon,
> >>
> >> In message <1403071815-32055-1-git-send-email-sjg@chromium.org> you wrote:
> >> > We need to subtract two hex numbers. Avoid using strtonum() by doing the
> >> > subtraction in bc with a suitable input base.
> >> >
> >> > Signed-off-by: Simon Glass <sjg@chromium.org>
> >> > Reported-by: Vasili Galka <vvv444@gmail.com>
> >> > ---
> >> >
> >> >  Makefile | 3 ++-
> >> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >> >
> >> > diff --git a/Makefile b/Makefile
> >> > index 24d9687..bb2f615 100644
> >> > --- a/Makefile
> >> > +++ b/Makefile
> >> > @@ -788,7 +788,8 @@ OBJCOPYFLAGS_u-boot.bin := -O binary
> >> >  binary_size_check: u-boot.bin System.map FORCE
> >> >     @file_size=`stat -c %s u-boot.bin` ; \
> >> >     map_size=$(shell cat System.map | \
> >> > -           awk '/_image_copy_start/ {start = $$1} /_image_binary_end/ {end = $$1} END {if (start != "" && end != "") print strtonum("0x" end) - strtonum("0x" start)}'); \
> >> > +           awk '/_image_copy_start/ {start = $$1} /_image_binary_end/ {end = $$1} END {if (start != "" && end != "") print "ibase=16; " toupper(end) " - " toupper(start)}' \
> >> > +           | bc); \
> >>
> >> I think instead of introducing yet another tool dependency this could
> >> be rewritten to use just bash:
> >>
> >>       awk '/_image_copy_start/ {start = $1}
> >>            /_image_binary_end/ {end = $1}
> >>            END { if (start != "" && end != "")
> >>               print "printf %d $$((0x" end " - 0x" start "))"
> >>            }' |
> >>       bash
> >
> > But now we're forcing bash.  Jeroen, since you most often run into the
> > "but now you've introduced a Linux'ism" problems, bash or bc or
> > something else for a portable hex to decimal conversion?  Or since so
> > much of U-Boot is hex when talking numbers, maybe we should just make
> > the echos say "... size of 0x$foo expected 0x$bar" ?
> 
> That's why I didn't use bash - I recall hitting that problem before
> but it might have been dtc rather than U-Boot. I thought bc might be
> safer. But let me know and I will respin.

Given Jeroen's answer, we'll keep to bc.

-- 
Tom
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