strconv: new API
R=golang-dev, bradfitz, gri, r, agl
CC=golang-dev
https://golang.org/cl/5434095
diff --git a/src/pkg/strconv/ftoa.go b/src/pkg/strconv/ftoa.go
index 8342b6a..e1ea0a35 100644
--- a/src/pkg/strconv/ftoa.go
+++ b/src/pkg/strconv/ftoa.go
@@ -22,8 +22,10 @@
var float32info = floatInfo{23, 8, -127}
var float64info = floatInfo{52, 11, -1023}
-// Ftoa32 converts the 32-bit floating-point number f to a string,
-// according to the format fmt and precision prec.
+// FormatFloat converts the floating-point number f to a string,
+// according to the format fmt and precision prec. It rounds the
+// result assuming that the original was obtained from a floating-point
+// value of bitSize bits (32 for float32, 64 for float64).
//
// The format fmt is one of
// 'b' (-ddddp±ddd, a binary exponent),
@@ -43,24 +45,17 @@
// Ftoa32(f) is not the same as Ftoa64(float32(f)),
// because correct rounding and the number of digits
// needed to identify f depend on the precision of the representation.
-func Ftoa32(f float32, fmt byte, prec int) string {
- return genericFtoa(uint64(math.Float32bits(f)), fmt, prec, &float32info)
-}
-
-// Ftoa64 is like Ftoa32 but converts a 64-bit floating-point number.
-func Ftoa64(f float64, fmt byte, prec int) string {
+func FormatFloat(f float64, fmt byte, prec int, n int) string {
+ if n == 32 {
+ return genericFtoa(uint64(math.Float32bits(float32(f))), fmt, prec, &float32info)
+ }
return genericFtoa(math.Float64bits(f), fmt, prec, &float64info)
}
-// FtoaN converts the 64-bit floating-point number f to a string,
-// according to the format fmt and precision prec, but it rounds the
-// result assuming that it was obtained from a floating-point value
-// of n bits (32 or 64).
-func FtoaN(f float64, fmt byte, prec int, n int) string {
- if n == 32 {
- return Ftoa32(float32(f), fmt, prec)
- }
- return Ftoa64(f, fmt, prec)
+// AppendFloat appends the string form of the floating-point number f,
+// as generated by FormatFloat, to dst and returns the extended buffer.
+func AppendFloat(dst []byte, f float64, fmt byte, prec int, n int) []byte {
+ return append(dst, FormatFloat(f, fmt, prec, n)...)
}
func genericFtoa(bits uint64, fmt byte, prec int, flt *floatInfo) string {
