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strconv: use better errors than os.EINVAL, os.ERANGE

Browse source 
R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5327052
This commit is contained in:
Russ Cox 2011-10-27 19:46:31 -07:00
parent 01e9a227cc
commit c1178aae86
9 changed files with 105 additions and 99 deletions
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2
src/pkg/exp/sql/convert_test.go
View file

@ -52,7 +52,7 @@ var conversionTests = []conversionTest{
{s: "256", d: &scanuint8, wanterr: `string "256" overflows uint8`},
{s: "256", d: &scanuint16, wantuint: 256},
{s: "-1", d: &scanint, wantint: -1},
{s: "foo", d: &scanint, wanterr: `converting string "foo" to a int: parsing "foo": invalid argument`},
{s: "foo", d: &scanint, wanterr: `converting string "foo" to a int: parsing "foo": invalid syntax`},
}
func intValue(intptr interface{}) int64 {

2
src/pkg/strconv/atob.go
View file

@ -16,7 +16,7 @@ func Atob(str string) (value bool, err os.Error) {
case "0", "f", "F", "false", "FALSE", "False":
return false, nil
}
return false, &NumError{str, os.EINVAL}
return false, &NumError{str, ErrSyntax}
}
// Btoa returns "true" or "false" according to the value of the boolean argument

4
src/pkg/strconv/atob_test.go
View file

@ -17,8 +17,8 @@ type atobTest struct {
}
var atobtests = []atobTest{
{"", false, os.EINVAL},
{"asdf", false, os.EINVAL},
{"", false, ErrSyntax},
{"asdf", false, ErrSyntax},
{"0", false, nil},
{"f", false, nil},
{"F", false, nil},

12
src/pkg/strconv/atof.go
View file

@ -350,11 +350,11 @@ func (d *decimal) atof32() (f float32, ok bool) {
// The errors that Atof32 returns have concrete type *NumError
// and include err.Num = s.
//
// If s is not syntactically well-formed, Atof32 returns err.Error = os.EINVAL.
// If s is not syntactically well-formed, Atof32 returns err.Error = ErrSyntax.
//
// If s is syntactically well-formed but is more than 1/2 ULP
// away from the largest floating point number of the given size,
// Atof32 returns f = ±Inf, err.Error = os.ERANGE.
// Atof32 returns f = ±Inf, err.Error = ErrRange.
func Atof32(s string) (f float32, err os.Error) {
if val, ok := special(s); ok {
return float32(val), nil
@ -362,7 +362,7 @@ func Atof32(s string) (f float32, err os.Error) {
var d decimal
if !d.set(s) {
return 0, &NumError{s, os.EINVAL}
return 0, &NumError{s, ErrSyntax}
}
if optimize {
if f, ok := d.atof32(); ok {
@ -372,7 +372,7 @@ func Atof32(s string) (f float32, err os.Error) {
b, ovf := d.floatBits(&float32info)
f = math.Float32frombits(uint32(b))
if ovf {
err = &NumError{s, os.ERANGE}
err = &NumError{s, ErrRange}
}
return f, err
}
@ -387,7 +387,7 @@ func Atof64(s string) (f float64, err os.Error) {
var d decimal
if !d.set(s) {
return 0, &NumError{s, os.EINVAL}
return 0, &NumError{s, ErrSyntax}
}
if optimize {
if f, ok := d.atof64(); ok {
@ -397,7 +397,7 @@ func Atof64(s string) (f float64, err os.Error) {
b, ovf := d.floatBits(&float64info)
f = math.Float64frombits(b)
if ovf {
err = &NumError{s, os.ERANGE}
err = &NumError{s, ErrRange}
}
return f, err
}

40
src/pkg/strconv/atof_test.go
View file

@ -18,11 +18,11 @@ type atofTest struct {
}
var atoftests = []atofTest{
{"", "0", os.EINVAL},
{"", "0", ErrSyntax},
{"1", "1", nil},
{"+1", "1", nil},
{"1x", "0", os.EINVAL},
{"1.1.", "0", os.EINVAL},
{"1x", "0", ErrSyntax},
{"1.1.", "0", ErrSyntax},
{"1e23", "1e+23", nil},
{"1E23", "1e+23", nil},
{"100000000000000000000000", "1e+23", nil},
@ -56,28 +56,28 @@ var atoftests = []atofTest{
{"1.7976931348623157e308", "1.7976931348623157e+308", nil},
{"-1.7976931348623157e308", "-1.7976931348623157e+308", nil},
// next float64 - too large
{"1.7976931348623159e308", "+Inf", os.ERANGE},
{"-1.7976931348623159e308", "-Inf", os.ERANGE},
{"1.7976931348623159e308", "+Inf", ErrRange},
{"-1.7976931348623159e308", "-Inf", ErrRange},
// the border is ...158079
// borderline - okay
{"1.7976931348623158e308", "1.7976931348623157e+308", nil},
{"-1.7976931348623158e308", "-1.7976931348623157e+308", nil},
// borderline - too large
{"1.797693134862315808e308", "+Inf", os.ERANGE},
{"-1.797693134862315808e308", "-Inf", os.ERANGE},
{"1.797693134862315808e308", "+Inf", ErrRange},
{"-1.797693134862315808e308", "-Inf", ErrRange},
// a little too large
{"1e308", "1e+308", nil},
{"2e308", "+Inf", os.ERANGE},
{"1e309", "+Inf", os.ERANGE},
{"2e308", "+Inf", ErrRange},
{"1e309", "+Inf", ErrRange},
// way too large
{"1e310", "+Inf", os.ERANGE},
{"-1e310", "-Inf", os.ERANGE},
{"1e400", "+Inf", os.ERANGE},
{"-1e400", "-Inf", os.ERANGE},
{"1e400000", "+Inf", os.ERANGE},
{"-1e400000", "-Inf", os.ERANGE},
{"1e310", "+Inf", ErrRange},
{"-1e310", "-Inf", ErrRange},
{"1e400", "+Inf", ErrRange},
{"-1e400", "-Inf", ErrRange},
{"1e400000", "+Inf", ErrRange},
{"-1e400000", "-Inf", ErrRange},
// denormalized
{"1e-305", "1e-305", nil},
@ -99,14 +99,14 @@ var atoftests = []atofTest{
// try to overflow exponent
{"1e-4294967296", "0", nil},
{"1e+4294967296", "+Inf", os.ERANGE},
{"1e+4294967296", "+Inf", ErrRange},
{"1e-18446744073709551616", "0", nil},
{"1e+18446744073709551616", "+Inf", os.ERANGE},
{"1e+18446744073709551616", "+Inf", ErrRange},
// Parse errors
{"1e", "0", os.EINVAL},
{"1e-", "0", os.EINVAL},
{".e-1", "0", os.EINVAL},
{"1e", "0", ErrSyntax},
{"1e-", "0", ErrSyntax},
{".e-1", "0", ErrSyntax},
// http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
{"2.2250738585072012e-308", "2.2250738585072014e-308", nil},

49
src/pkg/strconv/atoi.go
View file

@ -6,9 +6,16 @@ package strconv
import "os"
// ErrRange indicates that a value is out of range for the target type.
var ErrRange = os.NewError("value out of range")
// ErrSyntax indicates that a value does not have the right syntax for the target type.
var ErrSyntax = os.NewError("invalid syntax")
// A NumError records a failed conversion.
type NumError struct {
Num string
Error os.Error
Num string // the input
Error os.Error // the reason the conversion failed (ErrRange, ErrSyntax)
}
func (e *NumError) String() string { return `parsing "` + e.Num + `": ` + e.Error.String() }
@ -38,15 +45,15 @@ func cutoff64(base int) uint64 {
//
// The errors that Btoui64 returns have concrete type *NumError
// and include err.Num = s. If s is empty or contains invalid
// digits, err.Error = os.EINVAL; if the value corresponding
// to s cannot be represented by a uint64, err.Error = os.ERANGE.
// digits, err.Error = ErrSyntax; if the value corresponding
// to s cannot be represented by a uint64, err.Error = ErrRange.
func Btoui64(s string, b int) (n uint64, err os.Error) {
var cutoff uint64
s0 := s
switch {
case len(s) < 1:
err = os.EINVAL
err = ErrSyntax
goto Error
case 2 <= b && b <= 36:
@ -59,7 +66,7 @@ func Btoui64(s string, b int) (n uint64, err os.Error) {
b = 16
s = s[2:]
if len(s) < 1 {
err = os.EINVAL
err = ErrSyntax
goto Error
}
case s[0] == '0':
@ -88,19 +95,19 @@ func Btoui64(s string, b int) (n uint64, err os.Error) {
v = d - 'A' + 10
default:
n = 0
err = os.EINVAL
err = ErrSyntax
goto Error
}
if int(v) >= b {
n = 0
err = os.EINVAL
err = ErrSyntax
goto Error
}
if n >= cutoff {
// n*b overflows
n = 1<<64 - 1
err = os.ERANGE
err = ErrRange
goto Error
}
n *= uint64(b)
@ -109,7 +116,7 @@ func Btoui64(s string, b int) (n uint64, err os.Error) {
if n1 < n {
// n+v overflows
n = 1<<64 - 1
err = os.ERANGE
err = ErrRange
goto Error
}
n = n1
@ -124,8 +131,8 @@ Error:
// Atoui64 interprets a string s as a decimal number and
// returns the corresponding value n.
//
// Atoui64 returns err == os.EINVAL if s is empty or contains invalid digits.
// It returns err == os.ERANGE if s cannot be represented by a uint64.
// Atoui64 returns err.Error = ErrSyntax if s is empty or contains invalid digits.
// It returns err.Error = ErrRange if s cannot be represented by a uint64.
func Atoui64(s string) (n uint64, err os.Error) {
return Btoui64(s, 10)
}
@ -135,7 +142,7 @@ func Atoui64(s string) (n uint64, err os.Error) {
func Btoi64(s string, base int) (i int64, err os.Error) {
// Empty string bad.
if len(s) == 0 {
return 0, &NumError{s, os.EINVAL}
return 0, &NumError{s, ErrSyntax}
}
// Pick off leading sign.
@ -151,15 +158,15 @@ func Btoi64(s string, base int) (i int64, err os.Error) {
// Convert unsigned and check range.
var un uint64
un, err = Btoui64(s, base)
if err != nil && err.(*NumError).Error != os.ERANGE {
if err != nil && err.(*NumError).Error != ErrRange {
err.(*NumError).Num = s0
return 0, err
}
if !neg && un >= 1<<63 {
return 1<<63 - 1, &NumError{s0, os.ERANGE}
return 1<<63 - 1, &NumError{s0, ErrRange}
}
if neg && un > 1<<63 {
return -1 << 63, &NumError{s0, os.ERANGE}
return -1 << 63, &NumError{s0, ErrRange}
}
n := int64(un)
if neg {
@ -175,12 +182,12 @@ func Atoi64(s string) (i int64, err os.Error) { return Btoi64(s, 10) }
// Atoui is like Atoui64 but returns its result as a uint.
func Atoui(s string) (i uint, err os.Error) {
i1, e1 := Atoui64(s)
if e1 != nil && e1.(*NumError).Error != os.ERANGE {
if e1 != nil && e1.(*NumError).Error != ErrRange {
return 0, e1
}
i = uint(i1)
if uint64(i) != i1 {
return ^uint(0), &NumError{s, os.ERANGE}
return ^uint(0), &NumError{s, ErrRange}
}
return i, nil
}
@ -188,15 +195,15 @@ func Atoui(s string) (i uint, err os.Error) {
// Atoi is like Atoi64 but returns its result as an int.
func Atoi(s string) (i int, err os.Error) {
i1, e1 := Atoi64(s)
if e1 != nil && e1.(*NumError).Error != os.ERANGE {
if e1 != nil && e1.(*NumError).Error != ErrRange {
return 0, e1
}
i = int(i1)
if int64(i) != i1 {
if i1 < 0 {
return -1 << (IntSize - 1), &NumError{s, os.ERANGE}
return -1 << (IntSize - 1), &NumError{s, ErrRange}
}
return 1<<(IntSize-1) - 1, &NumError{s, os.ERANGE}
return 1<<(IntSize-1) - 1, &NumError{s, ErrRange}
}
return i, nil
}

60
src/pkg/strconv/atoi_test.go
View file

@ -18,36 +18,36 @@ type atoui64Test struct {
}
var atoui64tests = []atoui64Test{
{"", 0, os.EINVAL},
{"", 0, ErrSyntax},
{"0", 0, nil},
{"1", 1, nil},
{"12345", 12345, nil},
{"012345", 12345, nil},
{"12345x", 0, os.EINVAL},
{"12345x", 0, ErrSyntax},
{"98765432100", 98765432100, nil},
{"18446744073709551615", 1<<64 - 1, nil},
{"18446744073709551616", 1<<64 - 1, os.ERANGE},
{"18446744073709551620", 1<<64 - 1, os.ERANGE},
{"18446744073709551616", 1<<64 - 1, ErrRange},
{"18446744073709551620", 1<<64 - 1, ErrRange},
}
var btoui64tests = []atoui64Test{
{"", 0, os.EINVAL},
{"", 0, ErrSyntax},
{"0", 0, nil},
{"1", 1, nil},
{"12345", 12345, nil},
{"012345", 012345, nil},
{"0x12345", 0x12345, nil},
{"0X12345", 0x12345, nil},
{"12345x", 0, os.EINVAL},
{"12345x", 0, ErrSyntax},
{"98765432100", 98765432100, nil},
{"18446744073709551615", 1<<64 - 1, nil},
{"18446744073709551616", 1<<64 - 1, os.ERANGE},
{"18446744073709551620", 1<<64 - 1, os.ERANGE},
{"18446744073709551616", 1<<64 - 1, ErrRange},
{"18446744073709551620", 1<<64 - 1, ErrRange},
{"0xFFFFFFFFFFFFFFFF", 1<<64 - 1, nil},
{"0x10000000000000000", 1<<64 - 1, os.ERANGE},
{"0x10000000000000000", 1<<64 - 1, ErrRange},
{"01777777777777777777777", 1<<64 - 1, nil},
{"01777777777777777777778", 0, os.EINVAL},
{"02000000000000000000000", 1<<64 - 1, os.ERANGE},
{"01777777777777777777778", 0, ErrSyntax},
{"02000000000000000000000", 1<<64 - 1, ErrRange},
{"0200000000000000000000", 1 << 61, nil},
}
@ -58,7 +58,7 @@ type atoi64Test struct {
}
var atoi64tests = []atoi64Test{
{"", 0, os.EINVAL},
{"", 0, ErrSyntax},
{"0", 0, nil},
{"-0", 0, nil},
{"1", 1, nil},
@ -71,14 +71,14 @@ var atoi64tests = []atoi64Test{
{"-98765432100", -98765432100, nil},
{"9223372036854775807", 1<<63 - 1, nil},
{"-9223372036854775807", -(1<<63 - 1), nil},
{"9223372036854775808", 1<<63 - 1, os.ERANGE},
{"9223372036854775808", 1<<63 - 1, ErrRange},
{"-9223372036854775808", -1 << 63, nil},
{"9223372036854775809", 1<<63 - 1, os.ERANGE},
{"-9223372036854775809", -1 << 63, os.ERANGE},
{"9223372036854775809", 1<<63 - 1, ErrRange},
{"-9223372036854775809", -1 << 63, ErrRange},
}
var btoi64tests = []atoi64Test{
{"", 0, os.EINVAL},
{"", 0, ErrSyntax},
{"0", 0, nil},
{"-0", 0, nil},
{"1", 1, nil},
@ -89,16 +89,16 @@ var btoi64tests = []atoi64Test{
{"-012345", -012345, nil},
{"0x12345", 0x12345, nil},
{"-0X12345", -0x12345, nil},
{"12345x", 0, os.EINVAL},
{"-12345x", 0, os.EINVAL},
{"12345x", 0, ErrSyntax},
{"-12345x", 0, ErrSyntax},
{"98765432100", 98765432100, nil},
{"-98765432100", -98765432100, nil},
{"9223372036854775807", 1<<63 - 1, nil},
{"-9223372036854775807", -(1<<63 - 1), nil},
{"9223372036854775808", 1<<63 - 1, os.ERANGE},
{"9223372036854775808", 1<<63 - 1, ErrRange},
{"-9223372036854775808", -1 << 63, nil},
{"9223372036854775809", 1<<63 - 1, os.ERANGE},
{"-9223372036854775809", -1 << 63, os.ERANGE},
{"9223372036854775809", 1<<63 - 1, ErrRange},
{"-9223372036854775809", -1 << 63, ErrRange},
}
type atoui32Test struct {
@ -108,15 +108,15 @@ type atoui32Test struct {
}
var atoui32tests = []atoui32Test{
{"", 0, os.EINVAL},
{"", 0, ErrSyntax},
{"0", 0, nil},
{"1", 1, nil},
{"12345", 12345, nil},
{"012345", 12345, nil},
{"12345x", 0, os.EINVAL},
{"12345x", 0, ErrSyntax},
{"987654321", 987654321, nil},
{"4294967295", 1<<32 - 1, nil},
{"4294967296", 1<<32 - 1, os.ERANGE},
{"4294967296", 1<<32 - 1, ErrRange},
}
type atoi32Test struct {
@ -126,7 +126,7 @@ type atoi32Test struct {
}
var atoi32tests = []atoi32Test{
{"", 0, os.EINVAL},
{"", 0, ErrSyntax},
{"0", 0, nil},
{"-0", 0, nil},
{"1", 1, nil},
@ -135,16 +135,16 @@ var atoi32tests = []atoi32Test{
{"-12345", -12345, nil},
{"012345", 12345, nil},
{"-012345", -12345, nil},
{"12345x", 0, os.EINVAL},
{"-12345x", 0, os.EINVAL},
{"12345x", 0, ErrSyntax},
{"-12345x", 0, ErrSyntax},
{"987654321", 987654321, nil},
{"-987654321", -987654321, nil},
{"2147483647", 1<<31 - 1, nil},
{"-2147483647", -(1<<31 - 1), nil},
{"2147483648", 1<<31 - 1, os.ERANGE},
{"2147483648", 1<<31 - 1, ErrRange},
{"-2147483648", -1 << 31, nil},
{"2147483649", 1<<31 - 1, os.ERANGE},
{"-2147483649", -1 << 31, os.ERANGE},
{"2147483649", 1<<31 - 1, ErrRange},
{"-2147483649", -1 << 31, ErrRange},
}
func init() {

30
src/pkg/strconv/quote.go
View file

@ -161,7 +161,7 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
// easy cases
switch c := s[0]; {
case c == quote && (quote == '\'' || quote == '"'):
err = os.EINVAL
err = ErrSyntax
return
case c >= utf8.RuneSelf:
r, size := utf8.DecodeRuneInString(s)
@ -172,7 +172,7 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
// hard case: c is backslash
if len(s) <= 1 {
err = os.EINVAL
err = ErrSyntax
return
}
c := s[1]
@ -205,13 +205,13 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
}
var v rune
if len(s) < n {
err = os.EINVAL
err = ErrSyntax
return
}
for j := 0; j < n; j++ {
x, ok := unhex(s[j])
if !ok {
err = os.EINVAL
err = ErrSyntax
return
}
v = v<<4 | x
@ -223,7 +223,7 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
break
}
if v > unicode.MaxRune {
err = os.EINVAL
err = ErrSyntax
return
}
value = v
@ -231,7 +231,7 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
case '0', '1', '2', '3', '4', '5', '6', '7':
v := rune(c) - '0'
if len(s) < 2 {
err = os.EINVAL
err = ErrSyntax
return
}
for j := 0; j < 2; j++ { // one digit already; two more
@ -243,7 +243,7 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
}
s = s[2:]
if v > 255 {
err = os.EINVAL
err = ErrSyntax
return
}
value = v
@ -251,12 +251,12 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
value = '\\'
case '\'', '"':
if c != quote {
err = os.EINVAL
err = ErrSyntax
return
}
value = rune(c)
default:
err = os.EINVAL
err = ErrSyntax
return
}
tail = s
@ -271,25 +271,25 @@ func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string,
func Unquote(s string) (t string, err os.Error) {
n := len(s)
if n < 2 {
return "", os.EINVAL
return "", ErrSyntax
}
quote := s[0]
if quote != s[n-1] {
return "", os.EINVAL
return "", ErrSyntax
}
s = s[1 : n-1]
if quote == '`' {
if strings.Contains(s, "`") {
return "", os.EINVAL
return "", ErrSyntax
}
return s, nil
}
if quote != '"' && quote != '\'' {
return "", os.EINVAL
return "", ErrSyntax
}
if strings.Index(s, "\n") >= 0 {
return "", os.EINVAL
return "", ErrSyntax
}
// Is it trivial? Avoid allocation.
@ -319,7 +319,7 @@ func Unquote(s string) (t string, err os.Error) {
}
if quote == '\'' && len(s) != 0 {
// single-quoted must be single character
return "", os.EINVAL
return "", ErrSyntax
}
}
return buf.String(), nil

5
src/pkg/strconv/quote_test.go
View file

@ -5,7 +5,6 @@
package strconv_test
import (
"os"
. "strconv"
"testing"
)
@ -210,8 +209,8 @@ func TestUnquote(t *testing.T) {
}
for _, s := range misquoted {
if out, err := Unquote(s); out != "" || err != os.EINVAL {
t.Errorf("Unquote(%#q) = %q, %v want %q, %v", s, out, err, "", os.EINVAL)
if out, err := Unquote(s); out != "" || err != ErrSyntax {
t.Errorf("Unquote(%#q) = %q, %v want %q, %v", s, out, err, "", ErrSyntax)
}
}
}