diff options
author | Robert Griesemer <gri@golang.org> | 2010-05-21 14:28:34 -0700 |
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committer | Robert Griesemer <gri@golang.org> | 2010-05-21 14:28:34 -0700 |
commit | 97bb02cadc689aa0a3592f6f9bd3b26636d51ec1 (patch) | |
tree | e6d417879c4a1a275aa4e3762c2cb56aedd38356 /src/pkg/big | |
parent | 80f292a3c290b295d33d2175a6d47e365dfd4cb3 (diff) | |
download | golang-97bb02cadc689aa0a3592f6f9bd3b26636d51ec1.tar.gz |
big: fix Int.SetString comment, simplify implementation,
always return z for nat.scan
R=rsc
CC=golang-dev
http://codereview.appspot.com/1236043
Diffstat (limited to 'src/pkg/big')
-rwxr-xr-x | src/pkg/big/int.go | 30 | ||||
-rwxr-xr-x | src/pkg/big/nat.go | 2 |
2 files changed, 14 insertions, 18 deletions
diff --git a/src/pkg/big/int.go b/src/pkg/big/int.go index e1e45858a..dd9179660 100755 --- a/src/pkg/big/int.go +++ b/src/pkg/big/int.go @@ -333,18 +333,18 @@ func (x *Int) Int64() int64 { } -// SetString sets z to the value of s, interpreted in the given base. -// If base is 0 then SetString attempts to detect the base by at the prefix of -// s. '0x' implies base 16, '0' implies base 8. Otherwise base 10 is assumed. +// SetString sets z to the value of s, interpreted in the given base, +// and returns z and a boolean indicating success. If SetString fails, +// the value of z is undefined. +// +// If the base argument is 0, the string prefix determines the actual +// conversion base. A prefix of ``0x'' or ``0X'' selects base 16; the +// ``0'' prefix selects base 8, and a ``0b'' or ``0B'' prefix selects +// base 2. Otherwise the selected base is 10. +// func (z *Int) SetString(s string, base int) (*Int, bool) { - var scanned int - - if base == 1 || base > 16 { - goto Error - } - - if len(s) == 0 { - goto Error + if len(s) == 0 || base < 0 || base == 1 || 16 < base { + return z, false } neg := false @@ -353,18 +353,14 @@ func (z *Int) SetString(s string, base int) (*Int, bool) { s = s[1:] } + var scanned int z.abs, _, scanned = z.abs.scan(s, base) if scanned != len(s) { - goto Error + return z, false } z.neg = len(z.abs) > 0 && neg // 0 has no sign return z, true - -Error: - z.abs = nil - z.neg = false - return z, false } diff --git a/src/pkg/big/nat.go b/src/pkg/big/nat.go index b09893730..aa021e879 100755 --- a/src/pkg/big/nat.go +++ b/src/pkg/big/nat.go @@ -653,7 +653,7 @@ func (z nat) scan(s string, base int) (nat, int, int) { // reject illegal bases or strings consisting only of prefix if base < 2 || 16 < base || (base != 8 && i >= n) { - return nil, 0, 0 + return z, 0, 0 } // convert string |