correct a design flaw: Atoi etc should not guess the base.

leave that for Btoi with base == 0.

R=r
DELTA=146  (101 added, 29 deleted, 16 changed)
OCL=35584
CL=35593

src/pkg/strconv/atoi.go

@@ -35,21 +35,44 @@ func cutoff64(base int) uint64 {
 }
 
 // Btoui64 interprets a string s in an arbitrary base b (2 to 36)
-// and returns the corresponding value n.
+// and returns the corresponding value n.  If b == 0, the base
+// is taken from the string prefix: base 16 for "0x", base 8 for "0",
+// and base 10 otherwise.
 //
 // 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.
 func Btoui64(s string, b int) (n uint64, err os.Error) {
-	if b < 2 || b > 36 {
-		err = os.ErrorString("invalid base " + Itoa(b));
+	s0 := s;
+	switch {
+	case len(s) < 1:
+		err = os.EINVAL;
 		goto Error;
-	}
+
+	case 2 <= b && b <= 36:
+		// valid base; nothing to do
+
+	case b == 0:
+		// Look for octal, hex prefix.
+		switch {
+		case s[0] == '0' && len(s) > 1 && (s[1] == 'x' || s[1] == 'X'):
+			b = 16;
+			s = s[2:len(s)];
 			if len(s) < 1 {
 				err = os.EINVAL;
 				goto Error;
 			}
+		case s[0] == '0':
+			b = 8;
+		default:
+			b = 10;
+		}
+
+	default:
+		err = os.ErrorString("invalid base " + Itoa(b));
+		goto Error;
+	}
 
 	n = 0;
 	cutoff := cutoff64(b);
@@ -95,42 +118,21 @@ func Btoui64(s string, b int) (n uint64, err os.Error) {
 	return n, nil;
 
 Error:
-	return n, &NumError{s, err};
+	return n, &NumError{s0, err};
 }
 
-// Atoui64 interprets a string s as an unsigned decimal, octal, or
-// hexadecimal number and returns the corresponding value n.
-// The default base is decimal.  Strings beginning with 0x are
-// hexadecimal; strings beginning with 0 are octal.
+// 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.
 func Atoui64(s string) (n uint64, err os.Error) {
-	// Empty string bad.
-	if len(s) == 0 {
-		return 0, &NumError{s, os.EINVAL};
-	}
-
-	// Look for octal, hex prefix.
-	switch {
-	case s[0] == '0' && len(s) > 1 && (s[1] == 'x' || s[1] == 'X'):
-		n, err = Btoui64(s[2:len(s)], 16);
-	case s[0] == '0':
-		n, err = Btoui64(s, 8);
-	default:
-		n, err = Btoui64(s, 10);
-	}
-
-	if err != nil {
-		err.(*NumError).Num = s;
-	}
-	return;
+	return Btoui64(s, 10);
 }
 
-
-// Atoi64 is like Atoui64 but allows signed numbers and
+// Btoi64 is like Btoui64 but allows signed numbers and
 // returns its result in an int64.
-func Atoi64(s string) (i int64, 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};
@@ -148,7 +150,7 @@ func Atoi64(s string) (i int64, err os.Error) {
 
 	// Convert unsigned and check range.
 	var un uint64;
-	un, err = Atoui64(s);
+	un, err = Btoui64(s, base);
 	if err != nil && err.(*NumError).Error != os.ERANGE {
 		err.(*NumError).Num = s0;
 		return 0, err;
@@ -166,6 +168,13 @@ func Atoi64(s string) (i int64, err os.Error) {
 	return n, nil;
 }
 
+// Atoi64 is like Atoui64 but allows signed numbers and
+// returns its result in an int64.
+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);

src/pkg/strconv/atoi_test.go

@@ -18,6 +18,19 @@ type atoui64Test struct {
 }
 
 var atoui64tests = []atoui64Test{
+	atoui64Test{"", 0, os.EINVAL},
+	atoui64Test{"0", 0, nil},
+	atoui64Test{"1", 1, nil},
+	atoui64Test{"12345", 12345, nil},
+	atoui64Test{"012345", 12345, 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},
+}
+
+var btoui64tests = []atoui64Test{
 	atoui64Test{"", 0, os.EINVAL},
 	atoui64Test{"0", 0, nil},
 	atoui64Test{"1", 1, nil},
@@ -45,6 +58,26 @@ type atoi64Test struct {
 }
 
 var atoi64tests = []atoi64Test{
+	atoi64Test{"", 0, os.EINVAL},
+	atoi64Test{"0", 0, nil},
+	atoi64Test{"-0", 0, nil},
+	atoi64Test{"1", 1, nil},
+	atoi64Test{"-1", -1, nil},
+	atoi64Test{"12345", 12345, nil},
+	atoi64Test{"-12345", -12345, nil},
+	atoi64Test{"012345", 12345, nil},
+	atoi64Test{"-012345", -12345, nil},
+	atoi64Test{"98765432100", 98765432100, nil},
+	atoi64Test{"-98765432100", -98765432100, nil},
+	atoi64Test{"9223372036854775807", 1<<63 - 1, nil},
+	atoi64Test{"-9223372036854775807", -(1<<63 - 1), nil},
+	atoi64Test{"9223372036854775808", 1<<63 - 1, os.ERANGE},
+	atoi64Test{"-9223372036854775808", -1 << 63, nil},
+	atoi64Test{"9223372036854775809", 1<<63 - 1, os.ERANGE},
+	atoi64Test{"-9223372036854775809", -1 << 63, os.ERANGE},
+}
+
+var btoi64tests = []atoi64Test{
 	atoi64Test{"", 0, os.EINVAL},
 	atoi64Test{"0", 0, nil},
 	atoi64Test{"-0", 0, nil},
@@ -79,9 +112,7 @@ var atoui32tests = []atoui32Test{
 	atoui32Test{"0", 0, nil},
 	atoui32Test{"1", 1, nil},
 	atoui32Test{"12345", 12345, nil},
-	atoui32Test{"012345", 012345, nil},
-	atoui32Test{"0x12345", 0x12345, nil},
-	atoui32Test{"0X12345", 0x12345, nil},
+	atoui32Test{"012345", 12345, nil},
 	atoui32Test{"12345x", 0, os.EINVAL},
 	atoui32Test{"987654321", 987654321, nil},
 	atoui32Test{"4294967295", 1<<32 - 1, nil},
@@ -102,10 +133,8 @@ var atoi32tests = []atoi32Test{
 	atoi32Test{"-1", -1, nil},
 	atoi32Test{"12345", 12345, nil},
 	atoi32Test{"-12345", -12345, nil},
-	atoi32Test{"012345", 012345, nil},
-	atoi32Test{"-012345", -012345, nil},
-	atoi32Test{"0x12345", 0x12345, nil},
-	atoi32Test{"-0X12345", -0x12345, nil},
+	atoi32Test{"012345", 12345, nil},
+	atoi32Test{"-012345", -12345, nil},
 	atoi32Test{"12345x", 0, os.EINVAL},
 	atoi32Test{"-12345x", 0, os.EINVAL},
 	atoi32Test{"987654321", 987654321, nil},
@@ -127,12 +156,24 @@ func init() {
 			test.err = &NumError{test.in, test.err};
 		}
 	}
+	for i := range btoui64tests {
+		test := &btoui64tests[i];
+		if test.err != nil {
+			test.err = &NumError{test.in, test.err};
+		}
+	}
 	for i := range atoi64tests {
 		test := &atoi64tests[i];
 		if test.err != nil {
 			test.err = &NumError{test.in, test.err};
 		}
 	}
+	for i := range btoi64tests {
+		test := &btoi64tests[i];
+		if test.err != nil {
+			test.err = &NumError{test.in, test.err};
+		}
+	}
 	for i := range atoui32tests {
 		test := &atoui32tests[i];
 		if test.err != nil {
@@ -158,6 +199,17 @@ func TestAtoui64(t *testing.T) {
 	}
 }
 
+func TestBtoui64(t *testing.T) {
+	for i := range btoui64tests {
+		test := &btoui64tests[i];
+		out, err := Btoui64(test.in, 0);
+		if test.out != out || !reflect.DeepEqual(test.err, err) {
+			t.Errorf("Btoui64(%q) = %v, %v want %v, %v\n",
+				test.in, out, err, test.out, test.err);
+		}
+	}
+}
+
 func TestAtoi64(t *testing.T) {
 	for i := range atoi64tests {
 		test := &atoi64tests[i];
@@ -169,6 +221,17 @@ func TestAtoi64(t *testing.T) {
 	}
 }
 
+func TestBtoi64(t *testing.T) {
+	for i := range btoi64tests {
+		test := &btoi64tests[i];
+		out, err := Btoi64(test.in, 0);
+		if test.out != out || !reflect.DeepEqual(test.err, err) {
+			t.Errorf("Btoi64(%q) = %v, %v want %v, %v\n",
+				test.in, out, err, test.out, test.err);
+		}
+	}
+}
+
 func TestAtoui(t *testing.T) {
 	switch IntSize {
 	case 32: