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| author | Russ Cox <rsc@golang.org> | 2019-01-29 22:24:36 -0500 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2019-02-26 05:16:56 +0000 |
| commit | ac51237affc016dd22f5b4f67dc8a2d09adf1fb2 (patch) | |
| tree | 3a8ef2099ca6356ea1d69cab83f3755d8f09cdd2 /src/fmt/format.go | |
| parent | e1a6d1fc08b2701ac9f67353cb52c51d52877669 (diff) | |
| download | go-git-ac51237affc016dd22f5b4f67dc8a2d09adf1fb2.tar.gz | |
fmt: format 0b, 0o prefixes in %#b and %O
This CL modifies fmt's printer to implement %#b and %O
to emit leading 0b and 0o prefixes on binary and octal.
(%#o is already taken and emits "0377"; %O emits "0o377".)
See golang.org/design/19308-number-literals for background.
For #19308.
For #12711.
Vet update is #29986.
Change-Id: I7c38a4484c48a03abe9f6d45c7d981c7c314f583
Reviewed-on: https://go-review.googlesource.com/c/160246
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Diffstat (limited to 'src/fmt/format.go')
| -rw-r--r-- | src/fmt/format.go | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/fmt/format.go b/src/fmt/format.go index 6d93908095..24e7e9551a 100644 --- a/src/fmt/format.go +++ b/src/fmt/format.go @@ -191,7 +191,7 @@ func (f *fmt) fmtUnicode(u uint64) { } // fmtInteger formats signed and unsigned integers. -func (f *fmt) fmtInteger(u uint64, base int, isSigned bool, digits string) { +func (f *fmt) fmtInteger(u uint64, base int, isSigned bool, verb rune, digits string) { negative := isSigned && int64(u) < 0 if negative { u = -u @@ -275,6 +275,12 @@ func (f *fmt) fmtInteger(u uint64, base int, isSigned bool, digits string) { // Various prefixes: 0x, -, etc. if f.sharp { switch base { + case 2: + // Add a leading 0b. + i-- + buf[i] = 'b' + i-- + buf[i] = '0' case 8: if buf[i] != '0' { i-- @@ -288,6 +294,12 @@ func (f *fmt) fmtInteger(u uint64, base int, isSigned bool, digits string) { buf[i] = '0' } } + if verb == 'O' { + i-- + buf[i] = 'o' + i-- + buf[i] = '0' + } if negative { i-- |