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allow hex, octal in Atoi, etc.

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R=r
DELTA=169  (79 added, 23 deleted, 67 changed)
OCL=25079
CL=25083
This commit is contained in:
Russ Cox 2009-02-16 20:44:21 -08:00
parent 9e3e61627d
commit eb3823a44d
2 changed files with 152 additions and 96 deletions
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105
src/lib/strconv/atoi.go
View File

@ -14,51 +14,87 @@ func computeIntsize() uint {
}
var intsize = computeIntsize();
// Convert decimal string to unsigned integer.
func Atoui64(s string) (i uint64, err *os.Error) {
// empty string bad
if len(s) == 0 {
return 0, os.EINVAL
// 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;
}
// pick off zero
if s == "0" {
return 0, nil
// Convert arbitrary base string to unsigned integer.
func Btoui64(base int, s string) (n uint64, err *os.Error) {
if base < 2 || base > 36 || len(s) < 1 {
return 0, os.EINVAL;
}
// otherwise, leading zero bad:
// don't want to take something intended as octal.
if s[0] == '0' {
return 0, os.EINVAL
}
n = 0;
cutoff := cutoff64(base);
// parse number
n := uint64(0);
for i := 0; i < len(s); i++ {
if s[i] < '0' || s[i] > '9' {
return 0, os.EINVAL
var v byte;
switch {
case '0' <= s[i] && s[i] <= '9':
v = s[i] - '0';
case 'a' <= s[i] && s[i] <= 'z':
v = s[i] - 'a' + 10;
case 'A' <= s[i] && s[i] <= 'Z':
v = s[i] - 'A' + 10;
default:
return 0, os.EINVAL;
}
if n > (1<<64)/10 {
return 1<<64-1, os.ERANGE
}
n = n*10;
d := uint64(s[i] - '0');
if n+d < n {
return 1<<64-1, os.ERANGE
}
n += d;
}
return n, nil
if int(v) >= base {
return 0, os.EINVAL;
}
// Convert decimal string to integer.
func Atoi64(s string) (i int64, err *os.Error) {
// empty string bad
if n >= cutoff {
// n*base overflows
return 1<<64-1, os.ERANGE;
}
n *= uint64(base);
n1 := n+uint64(v);
if n1 < n {
// n+v overflows
return 1<<64-1, os.ERANGE;
}
n = n1;
}
return n, nil;
}
// Convert string to uint64.
// Use standard prefixes to signal octal, hexadecimal.
func Atoui64(s string) (i uint64, err *os.Error) {
// Empty string bad.
if len(s) == 0 {
return 0, os.EINVAL
}
// pick off leading sign
// Look for octal, hex prefix.
if s[0] == '0' && len(s) > 1 {
if s[1] == 'x' || s[1] == 'X' {
// hex
return Btoui64(16, s[2:len(s)]);
}
// octal
return Btoui64(8, s[1:len(s)]);
}
// decimal
return Btoui64(10, s);
}
// Convert string to int64.
// Use standard prefixes to signal octal, hexadecimal.
func Atoi64(s string) (i int64, err *os.Error) {
// Empty string bad.
if len(s) == 0 {
return 0, os.EINVAL
}
// Pick off leading sign.
neg := false;
if s[0] == '+' {
s = s[1:len(s)]
@ -67,6 +103,7 @@ func Atoi64(s string) (i int64, err *os.Error) {
s = s[1:len(s)]
}
// Convert unsigned and check range.
var un uint64;
un, err = Atoui64(s);
if err != nil && err != os.ERANGE {
@ -85,6 +122,8 @@ func Atoi64(s string) (i int64, err *os.Error) {
return n, nil
}
// Convert string to uint.
// Use standard prefixes to signal octal, hexadecimal.
func Atoui(s string) (i uint, err *os.Error) {
i1, e1 := Atoui64(s);
if e1 != nil && e1 != os.ERANGE {
@ -99,6 +138,8 @@ func Atoui(s string) (i uint, err *os.Error) {
return i, nil
}
// Convert string to int.
// Use standard prefixes to signal octal, hexadecimal.
func Atoi(s string) (i int, err *os.Error) {
i1, e1 := Atoi64(s);
if e1 != nil && e1 != os.ERANGE {

29
src/lib/strconv/atoi_test.go
View File

@ -3,9 +3,10 @@
// license that can be found in the LICENSE file.
package strconv
import (
"os";
"fmt";
"os";
"strconv";
"testing"
)
@ -21,12 +22,20 @@ var atoui64tests = []atoui64Test (
atoui64Test("0", 0, nil),
atoui64Test("1", 1, nil),
atoui64Test("12345", 12345, nil),
atoui64Test( "012345", 0, os.EINVAL ),
atoui64Test("012345", 012345, nil),
atoui64Test("0x12345", 0x12345, nil),
atoui64Test("0X12345", 0x12345, nil),
atoui64Test("12345x", 0, os.EINVAL),
atoui64Test("98765432100", 98765432100, nil),
atoui64Test("18446744073709551615", 1<<64-1, nil),
atoui64Test("18446744073709551616", 1<<64-1, os.ERANGE),
atoui64Test("18446744073709551620", 1<<64-1, os.ERANGE),
atoui64Test("0xFFFFFFFFFFFFFFFF", 1<<64-1, nil),
atoui64Test("0x10000000000000000", 1<<64-1, os.ERANGE),
atoui64Test("01777777777777777777777", 1<<64-1, nil),
atoui64Test("01777777777777777777778", 0, os.EINVAL),
atoui64Test("02000000000000000000000", 1<<64-1, os.ERANGE),
atoui64Test("0200000000000000000000", 1<<61, nil),
)
type atoi64Test struct {
@ -43,8 +52,10 @@ var atoi64test = []atoi64Test (
atoi64Test("-1", -1, nil),
atoi64Test("12345", 12345, nil),
atoi64Test("-12345", -12345, nil),
atoi64Test( "012345", 0, os.EINVAL ),
atoi64Test( "-012345", 0, os.EINVAL ),
atoi64Test("012345", 012345, nil),
atoi64Test("-012345", -012345, nil),
atoi64Test("0x12345", 0x12345, nil),
atoi64Test("-0X12345", -0x12345, nil),
atoi64Test("12345x", 0, os.EINVAL),
atoi64Test("-12345x", 0, os.EINVAL),
atoi64Test("98765432100", 98765432100, nil),
@ -68,7 +79,9 @@ var atoui32tests = []atoui32Test (
atoui32Test("0", 0, nil),
atoui32Test("1", 1, nil),
atoui32Test("12345", 12345, nil),
atoui32Test( "012345", 0, os.EINVAL ),
atoui32Test("012345", 012345, nil),
atoui32Test("0x12345", 0x12345, nil),
atoui32Test("0X12345", 0x12345, nil),
atoui32Test("12345x", 0, os.EINVAL),
atoui32Test("987654321", 987654321, nil),
atoui32Test("4294967295", 1<<32-1, nil),
@ -89,8 +102,10 @@ var atoi32tests = []atoi32Test (
atoi32Test("-1", -1, nil),
atoi32Test("12345", 12345, nil),
atoi32Test("-12345", -12345, nil),
atoi32Test( "012345", 0, os.EINVAL ),
atoi32Test( "-012345", 0, os.EINVAL ),
atoi32Test("012345", 012345, nil),
atoi32Test("-012345", -012345, nil),
atoi32Test("0x12345", 0x12345, nil),
atoi32Test("-0X12345", -0x12345, nil),
atoi32Test("12345x", 0, os.EINVAL),
atoi32Test("-12345x", 0, os.EINVAL),
atoi32Test("987654321", 987654321, nil),