diff options
Diffstat (limited to 'libgo/go/fmt/print.go')
| -rw-r--r-- | libgo/go/fmt/print.go | 88 |
1 files changed, 57 insertions, 31 deletions
diff --git a/libgo/go/fmt/print.go b/libgo/go/fmt/print.go index 3b7d3464e20..13438243cdd 100644 --- a/libgo/go/fmt/print.go +++ b/libgo/go/fmt/print.go @@ -5,13 +5,11 @@ package fmt import ( - "bytes" "errors" "io" "os" "reflect" "sync" - "unicode" "unicode/utf8" ) @@ -71,11 +69,45 @@ type GoStringer interface { GoString() string } +// Use simple []byte instead of bytes.Buffer to avoid large dependency. +type buffer []byte + +func (b *buffer) Write(p []byte) (n int, err error) { + *b = append(*b, p...) + return len(p), nil +} + +func (b *buffer) WriteString(s string) (n int, err error) { + *b = append(*b, s...) + return len(s), nil +} + +func (b *buffer) WriteByte(c byte) error { + *b = append(*b, c) + return nil +} + +func (bp *buffer) WriteRune(r rune) error { + if r < utf8.RuneSelf { + *bp = append(*bp, byte(r)) + return nil + } + + b := *bp + n := len(b) + for n+utf8.UTFMax > cap(b) { + b = append(b, 0) + } + w := utf8.EncodeRune(b[n:n+utf8.UTFMax], r) + *bp = b[:n+w] + return nil +} + type pp struct { n int panicking bool erroring bool // printing an error condition - buf bytes.Buffer + buf buffer // field holds the current item, as an interface{}. field interface{} // value holds the current item, as a reflect.Value, and will be @@ -133,10 +165,10 @@ func newPrinter() *pp { // Save used pp structs in ppFree; avoids an allocation per invocation. func (p *pp) free() { // Don't hold on to pp structs with large buffers. - if cap(p.buf.Bytes()) > 1024 { + if cap(p.buf) > 1024 { return } - p.buf.Reset() + p.buf = p.buf[:0] p.field = nil p.value = reflect.Value{} ppFree.put(p) @@ -179,7 +211,7 @@ func (p *pp) Write(b []byte) (ret int, err error) { func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) { p := newPrinter() p.doPrintf(format, a) - n64, err := p.buf.WriteTo(w) + n64, err := w.Write(p.buf) p.free() return int(n64), err } @@ -194,7 +226,7 @@ func Printf(format string, a ...interface{}) (n int, err error) { func Sprintf(format string, a ...interface{}) string { p := newPrinter() p.doPrintf(format, a) - s := p.buf.String() + s := string(p.buf) p.free() return s } @@ -213,7 +245,7 @@ func Errorf(format string, a ...interface{}) error { func Fprint(w io.Writer, a ...interface{}) (n int, err error) { p := newPrinter() p.doPrint(a, false, false) - n64, err := p.buf.WriteTo(w) + n64, err := w.Write(p.buf) p.free() return int(n64), err } @@ -230,7 +262,7 @@ func Print(a ...interface{}) (n int, err error) { func Sprint(a ...interface{}) string { p := newPrinter() p.doPrint(a, false, false) - s := p.buf.String() + s := string(p.buf) p.free() return s } @@ -245,7 +277,7 @@ func Sprint(a ...interface{}) string { func Fprintln(w io.Writer, a ...interface{}) (n int, err error) { p := newPrinter() p.doPrint(a, true, true) - n64, err := p.buf.WriteTo(w) + n64, err := w.Write(p.buf) p.free() return int(n64), err } @@ -262,7 +294,7 @@ func Println(a ...interface{}) (n int, err error) { func Sprintln(a ...interface{}) string { p := newPrinter() p.doPrint(a, true, true) - s := p.buf.String() + s := string(p.buf) p.free() return s } @@ -352,7 +384,7 @@ func (p *pp) fmtInt64(v int64, verb rune) { case 'o': p.fmt.integer(v, 8, signed, ldigits) case 'q': - if 0 <= v && v <= unicode.MaxRune { + if 0 <= v && v <= utf8.MaxRune { p.fmt.fmt_qc(v) } else { p.badVerb(verb) @@ -416,7 +448,7 @@ func (p *pp) fmtUint64(v uint64, verb rune, goSyntax bool) { case 'o': p.fmt.integer(int64(v), 8, unsigned, ldigits) case 'q': - if 0 <= v && v <= unicode.MaxRune { + if 0 <= v && v <= utf8.MaxRune { p.fmt.fmt_qc(int64(v)) } else { p.badVerb(verb) @@ -553,6 +585,14 @@ func (p *pp) fmtBytes(v []byte, verb rune, goSyntax bool, depth int) { } func (p *pp) fmtPointer(value reflect.Value, verb rune, goSyntax bool) { + switch verb { + case 'p', 'v', 'b', 'd', 'o', 'x', 'X': + // ok + default: + p.badVerb(verb) + return + } + var u uintptr switch value.Kind() { case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Slice, reflect.UnsafePointer: @@ -561,6 +601,7 @@ func (p *pp) fmtPointer(value reflect.Value, verb rune, goSyntax bool) { p.badVerb(verb) return } + if goSyntax { p.add('(') p.buf.WriteString(value.Type().String()) @@ -572,6 +613,8 @@ func (p *pp) fmtPointer(value reflect.Value, verb rune, goSyntax bool) { p.fmt0x64(uint64(u), true) } p.add(')') + } else if verb == 'v' && u == 0 { + p.buf.Write(nilAngleBytes) } else { p.fmt0x64(uint64(u), !p.fmt.sharp) } @@ -929,24 +972,7 @@ BigSwitch: break BigSwitch } } - if goSyntax { - p.buf.WriteByte('(') - p.buf.WriteString(value.Type().String()) - p.buf.WriteByte(')') - p.buf.WriteByte('(') - if v == 0 { - p.buf.Write(nilBytes) - } else { - p.fmt0x64(uint64(v), true) - } - p.buf.WriteByte(')') - break - } - if v == 0 { - p.buf.Write(nilAngleBytes) - break - } - p.fmt0x64(uint64(v), true) + fallthrough case reflect.Chan, reflect.Func, reflect.UnsafePointer: p.fmtPointer(value, verb, goSyntax) default: |