code review 4131042: scan: permit base prefixes 0nnn and 0xnn when scanning

scan: permit base prefixes 0nnn and 0xnn when scanning
signed or unsigned integers using %v or the formatless scanner.
That is, Sscan("0x11", &i) or Sscanf("0x11", "%v", &i) will now
set i to 17.   If a format other than %v is presented, the behavior
is as before.

Fixes issue 1469.

[r, 2011-02-03 23:25:38]

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

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

[r, 2011-02-03 23:27:40]

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

Please take another look.

[rsc, 2011-02-04 21:07:29]

LGTM

http://codereview.appspot.com/4131042/diff/3001/src/pkg/fmt/scan.go
File src/pkg/fmt/scan.go (right):

http://codereview.appspot.com/4131042/diff/3001/src/pkg/fmt/scan.go#newcode382
src/pkg/fmt/scan.go:382: func oneOf(ok string, rune int) bool {
return strings.IndexRune(ok, rune) >= 0

or inline

[r, 2011-02-04 21:14:41]

*** Submitted as http://code.google.com/p/go/source/detail?r=475e73445ae1 ***

scan: permit base prefixes 0nnn and 0xnn when scanning
signed or unsigned integers using %v or the formatless scanner.
That is, Sscan("0x11", &i) or Sscanf("0x11", "%v", &i) will now
set i to 17.   If a format other than %v is presented, the behavior
is as before.

Fixes issue 1469.

R=rsc
CC=golang-dev
http://codereview.appspot.com/4131042