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path: root/src/pkg/strconv/atoi.go
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Diffstat (limited to 'src/pkg/strconv/atoi.go')
-rw-r--r--src/pkg/strconv/atoi.go198
1 files changed, 0 insertions, 198 deletions
diff --git a/src/pkg/strconv/atoi.go b/src/pkg/strconv/atoi.go
deleted file mode 100644
index 9ecec5a58..000000000
--- a/src/pkg/strconv/atoi.go
+++ /dev/null
@@ -1,198 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package strconv
-
-import "errors"
-
-// ErrRange indicates that a value is out of range for the target type.
-var ErrRange = errors.New("value out of range")
-
-// ErrSyntax indicates that a value does not have the right syntax for the target type.
-var ErrSyntax = errors.New("invalid syntax")
-
-// A NumError records a failed conversion.
-type NumError struct {
- Func string // the failing function (ParseBool, ParseInt, ParseUint, ParseFloat)
- Num string // the input
- Err error // the reason the conversion failed (ErrRange, ErrSyntax)
-}
-
-func (e *NumError) Error() string {
- return "strconv." + e.Func + ": " + "parsing " + Quote(e.Num) + ": " + e.Err.Error()
-}
-
-func syntaxError(fn, str string) *NumError {
- return &NumError{fn, str, ErrSyntax}
-}
-
-func rangeError(fn, str string) *NumError {
- return &NumError{fn, str, ErrRange}
-}
-
-const intSize = 32 << (^uint(0) >> 63)
-
-// IntSize is the size in bits of an int or uint value.
-const IntSize = intSize
-
-// Return the first number n such that n*base >= 1<<64.
-func cutoff64(base int) uint64 {
- if base < 2 {
- return 0
- }
- return (1<<64-1)/uint64(base) + 1
-}
-
-// ParseUint is like ParseInt but for unsigned numbers.
-func ParseUint(s string, base int, bitSize int) (n uint64, err error) {
- var cutoff, maxVal uint64
-
- if bitSize == 0 {
- bitSize = int(IntSize)
- }
-
- s0 := s
- switch {
- case len(s) < 1:
- err = ErrSyntax
- goto Error
-
- case 2 <= base && base <= 36:
- // valid base; nothing to do
-
- case base == 0:
- // Look for octal, hex prefix.
- switch {
- case s[0] == '0' && len(s) > 1 && (s[1] == 'x' || s[1] == 'X'):
- base = 16
- s = s[2:]
- if len(s) < 1 {
- err = ErrSyntax
- goto Error
- }
- case s[0] == '0':
- base = 8
- default:
- base = 10
- }
-
- default:
- err = errors.New("invalid base " + Itoa(base))
- goto Error
- }
-
- n = 0
- cutoff = cutoff64(base)
- maxVal = 1<<uint(bitSize) - 1
-
- for i := 0; i < len(s); i++ {
- var v byte
- d := s[i]
- switch {
- case '0' <= d && d <= '9':
- v = d - '0'
- case 'a' <= d && d <= 'z':
- v = d - 'a' + 10
- case 'A' <= d && d <= 'Z':
- v = d - 'A' + 10
- default:
- n = 0
- err = ErrSyntax
- goto Error
- }
- if int(v) >= base {
- n = 0
- err = ErrSyntax
- goto Error
- }
-
- if n >= cutoff {
- // n*base overflows
- n = 1<<64 - 1
- err = ErrRange
- goto Error
- }
- n *= uint64(base)
-
- n1 := n + uint64(v)
- if n1 < n || n1 > maxVal {
- // n+v overflows
- n = 1<<64 - 1
- err = ErrRange
- goto Error
- }
- n = n1
- }
-
- return n, nil
-
-Error:
- return n, &NumError{"ParseUint", s0, err}
-}
-
-// ParseInt interprets a string s in the given base (2 to 36) and
-// returns the corresponding value i. If base == 0, the base is
-// implied by the string's prefix: base 16 for "0x", base 8 for
-// "0", and base 10 otherwise.
-//
-// The bitSize argument specifies the integer type
-// that the result must fit into. Bit sizes 0, 8, 16, 32, and 64
-// correspond to int, int8, int16, int32, and int64.
-//
-// The errors that ParseInt returns have concrete type *NumError
-// and include err.Num = s. If s is empty or contains invalid
-// digits, err.Err = ErrSyntax and the returned value is 0;
-// if the value corresponding to s cannot be represented by a
-// signed integer of the given size, err.Err = ErrRange and the
-// returned value is the maximum magnitude integer of the
-// appropriate bitSize and sign.
-func ParseInt(s string, base int, bitSize int) (i int64, err error) {
- const fnParseInt = "ParseInt"
-
- if bitSize == 0 {
- bitSize = int(IntSize)
- }
-
- // Empty string bad.
- if len(s) == 0 {
- return 0, syntaxError(fnParseInt, s)
- }
-
- // Pick off leading sign.
- s0 := s
- neg := false
- if s[0] == '+' {
- s = s[1:]
- } else if s[0] == '-' {
- neg = true
- s = s[1:]
- }
-
- // Convert unsigned and check range.
- var un uint64
- un, err = ParseUint(s, base, bitSize)
- if err != nil && err.(*NumError).Err != ErrRange {
- err.(*NumError).Func = fnParseInt
- err.(*NumError).Num = s0
- return 0, err
- }
- cutoff := uint64(1 << uint(bitSize-1))
- if !neg && un >= cutoff {
- return int64(cutoff - 1), rangeError(fnParseInt, s0)
- }
- if neg && un > cutoff {
- return -int64(cutoff), rangeError(fnParseInt, s0)
- }
- n := int64(un)
- if neg {
- n = -n
- }
- return n, nil
-}
-
-// Atoi is shorthand for ParseInt(s, 10, 0).
-func Atoi(s string) (i int, err error) {
- i64, err := ParseInt(s, 10, 0)
- return int(i64), err
-}