code review 4682045: fmt: detect implied zero-precision field width

fmt: detect implied zero-precision field width

Printf formatting in the C library tradition allows an isolated period to specify
a zero precision, so that "%5.0f" and "%5.f" have the same meaning. Also, the any
width but no fractional digits "%.0f" and "%.f" are equivalent. It looks funny but
seems to be universally supported. I've changed the approprate code in print.c so
that once the period is seen the precision flag is set and the width is zero unless
further digits are provided.

[mtj, 2011-07-08 15:23:00]

Hello golang-dev@googlegroups.com (cc: golang-dev@googlegroups.com,
r@google.com),

I'd like you to review this change to
https://go.googlecode.com/hg/

[gri, 2011-07-11 20:19:51]

LGTM, leaving for r.

[r, 2011-07-12 04:00:19]

still waiting for a relevant test case.