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bytes, strings: more consistent error messages

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LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/86060044
This commit is contained in:
Robert Griesemer 2014-04-10 21:45:41 -07:00
parent 62bda120ef
commit 08d8eca968
4 changed files with 16 additions and 16 deletions
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12
src/pkg/bytes/reader.go
View File

@ -45,7 +45,7 @@ func (r *Reader) Read(b []byte) (n int, err error) {
func (r *Reader) ReadAt(b []byte, off int64) (n int, err error) {
// cannot modify state - see io.ReaderAt
if off < 0 {
return 0, errors.New("bytes: invalid offset")
return 0, errors.New("bytes.Reader.ReadAt: negative offset")
}
if off >= int64(len(r.s)) {
return 0, io.EOF
@ -68,11 +68,11 @@ func (r *Reader) ReadByte() (b byte, err error) {
}
func (r *Reader) UnreadByte() error {
r.prevRune = -1
if r.i <= 0 {
return errors.New("bytes.Reader: at beginning of slice")
return errors.New("bytes.Reader.UnreadByte: at beginning of slice")
}
r.i--
r.prevRune = -1
return nil
}
@ -93,7 +93,7 @@ func (r *Reader) ReadRune() (ch rune, size int, err error) {
func (r *Reader) UnreadRune() error {
if r.prevRune < 0 {
return errors.New("bytes.Reader: previous operation was not ReadRune")
return errors.New("bytes.Reader.UnreadRune: previous operation was not ReadRune")
}
r.i = int64(r.prevRune)
r.prevRune = -1
@ -112,10 +112,10 @@ func (r *Reader) Seek(offset int64, whence int) (int64, error) {
case 2:
abs = int64(len(r.s)) + offset
default:
return 0, errors.New("bytes: invalid whence")
return 0, errors.New("bytes.Reader.Seek: invalid whence")
}
if abs < 0 {
return 0, errors.New("bytes: negative position")
return 0, errors.New("bytes.Reader.Seek: negative position")
}
r.i = abs
return abs, nil

4
src/pkg/bytes/reader_test.go
View File

@ -27,7 +27,7 @@ func TestReader(t *testing.T) {
{seek: os.SEEK_SET, off: 0, n: 20, want: "0123456789"},
{seek: os.SEEK_SET, off: 1, n: 1, want: "1"},
{seek: os.SEEK_CUR, off: 1, wantpos: 3, n: 2, want: "34"},
{seek: os.SEEK_SET, off: -1, seekerr: "bytes: negative position"},
{seek: os.SEEK_SET, off: -1, seekerr: "bytes.Reader.Seek: negative position"},
{seek: os.SEEK_SET, off: 1 << 33, wantpos: 1 << 33},
{seek: os.SEEK_CUR, off: 1, wantpos: 1<<33 + 1},
{seek: os.SEEK_SET, n: 5, want: "01234"},
@ -84,7 +84,7 @@ func TestReaderAt(t *testing.T) {
{1, 9, "123456789", nil},
{11, 10, "", io.EOF},
{0, 0, "", nil},
{-1, 0, "", "bytes: invalid offset"},
{-1, 0, "", "bytes.Reader.ReadAt: negative offset"},
}
for i, tt := range tests {
b := make([]byte, tt.n)

12
src/pkg/strings/reader.go
View File

@ -44,7 +44,7 @@ func (r *Reader) Read(b []byte) (n int, err error) {
func (r *Reader) ReadAt(b []byte, off int64) (n int, err error) {
// cannot modify state - see io.ReaderAt
if off < 0 {
return 0, errors.New("strings: invalid offset")
return 0, errors.New("strings.Reader.ReadAt: negative offset")
}
if off >= int64(len(r.s)) {
return 0, io.EOF
@ -67,11 +67,11 @@ func (r *Reader) ReadByte() (b byte, err error) {
}
func (r *Reader) UnreadByte() error {
r.prevRune = -1
if r.i <= 0 {
return errors.New("strings.Reader: at beginning of string")
return errors.New("strings.Reader.UnreadByte: at beginning of string")
}
r.i--
r.prevRune = -1
return nil
}
@ -92,7 +92,7 @@ func (r *Reader) ReadRune() (ch rune, size int, err error) {
func (r *Reader) UnreadRune() error {
if r.prevRune < 0 {
return errors.New("strings.Reader: previous operation was not ReadRune")
return errors.New("strings.Reader.UnreadRune: previous operation was not ReadRune")
}
r.i = int64(r.prevRune)
r.prevRune = -1
@ -111,10 +111,10 @@ func (r *Reader) Seek(offset int64, whence int) (int64, error) {
case 2:
abs = int64(len(r.s)) + offset
default:
return 0, errors.New("strings: invalid whence")
return 0, errors.New("strings.Reader.Seek: invalid whence")
}
if abs < 0 {
return 0, errors.New("strings: negative position")
return 0, errors.New("strings.Reader.Seek: negative position")
}
r.i = abs
return abs, nil

4
src/pkg/strings/reader_test.go
View File

@ -27,7 +27,7 @@ func TestReader(t *testing.T) {
{seek: os.SEEK_SET, off: 0, n: 20, want: "0123456789"},
{seek: os.SEEK_SET, off: 1, n: 1, want: "1"},
{seek: os.SEEK_CUR, off: 1, wantpos: 3, n: 2, want: "34"},
{seek: os.SEEK_SET, off: -1, seekerr: "strings: negative position"},
{seek: os.SEEK_SET, off: -1, seekerr: "strings.Reader.Seek: negative position"},
{seek: os.SEEK_SET, off: 1 << 33, wantpos: 1 << 33},
{seek: os.SEEK_CUR, off: 1, wantpos: 1<<33 + 1},
{seek: os.SEEK_SET, n: 5, want: "01234"},
@ -84,7 +84,7 @@ func TestReaderAt(t *testing.T) {
{1, 9, "123456789", nil},
{11, 10, "", io.EOF},
{0, 0, "", nil},
{-1, 0, "", "strings: invalid offset"},
{-1, 0, "", "strings.Reader.ReadAt: negative offset"},
}
for i, tt := range tests {
b := make([]byte, tt.n)