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Diffstat (limited to 'src/fmt/scan_test.go')
-rw-r--r-- | src/fmt/scan_test.go | 1334 |
1 files changed, 1334 insertions, 0 deletions
diff --git a/src/fmt/scan_test.go b/src/fmt/scan_test.go new file mode 100644 index 0000000..e8c5769 --- /dev/null +++ b/src/fmt/scan_test.go @@ -0,0 +1,1334 @@ +// 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 fmt_test + +import ( + "bufio" + "bytes" + "errors" + . "fmt" + "io" + "math" + "reflect" + "regexp" + "strings" + "testing" + "testing/iotest" + "unicode/utf8" +) + +type ScanTest struct { + text string + in any + out any +} + +type ScanfTest struct { + format string + text string + in any + out any +} + +type ScanfMultiTest struct { + format string + text string + in []any + out []any + err string +} + +var ( + boolVal bool + intVal int + int8Val int8 + int16Val int16 + int32Val int32 + int64Val int64 + uintVal uint + uint8Val uint8 + uint16Val uint16 + uint32Val uint32 + uint64Val uint64 + uintptrVal uintptr + float32Val float32 + float64Val float64 + stringVal string + bytesVal []byte + runeVal rune + complex64Val complex64 + complex128Val complex128 + renamedBoolVal renamedBool + renamedIntVal renamedInt + renamedInt8Val renamedInt8 + renamedInt16Val renamedInt16 + renamedInt32Val renamedInt32 + renamedInt64Val renamedInt64 + renamedUintVal renamedUint + renamedUint8Val renamedUint8 + renamedUint16Val renamedUint16 + renamedUint32Val renamedUint32 + renamedUint64Val renamedUint64 + renamedUintptrVal renamedUintptr + renamedStringVal renamedString + renamedBytesVal renamedBytes + renamedFloat32Val renamedFloat32 + renamedFloat64Val renamedFloat64 + renamedComplex64Val renamedComplex64 + renamedComplex128Val renamedComplex128 +) + +// Xs accepts any non-empty run of the verb character +type Xs string + +func (x *Xs) Scan(state ScanState, verb rune) error { + tok, err := state.Token(true, func(r rune) bool { return r == verb }) + if err != nil { + return err + } + s := string(tok) + if !regexp.MustCompile("^" + string(verb) + "+$").MatchString(s) { + return errors.New("syntax error for xs") + } + *x = Xs(s) + return nil +} + +var xVal Xs + +// IntString accepts an integer followed immediately by a string. +// It tests the embedding of a scan within a scan. +type IntString struct { + i int + s string +} + +func (s *IntString) Scan(state ScanState, verb rune) error { + if _, err := Fscan(state, &s.i); err != nil { + return err + } + + tok, err := state.Token(true, nil) + if err != nil { + return err + } + s.s = string(tok) + return nil +} + +var intStringVal IntString + +var scanTests = []ScanTest{ + // Basic types + {"T\n", &boolVal, true}, // boolean test vals toggle to be sure they are written + {"F\n", &boolVal, false}, // restored to zero value + {"21\n", &intVal, 21}, + {"2_1\n", &intVal, 21}, + {"0\n", &intVal, 0}, + {"000\n", &intVal, 0}, + {"0x10\n", &intVal, 0x10}, + {"0x_1_0\n", &intVal, 0x10}, + {"-0x10\n", &intVal, -0x10}, + {"0377\n", &intVal, 0377}, + {"0_3_7_7\n", &intVal, 0377}, + {"0o377\n", &intVal, 0377}, + {"0o_3_7_7\n", &intVal, 0377}, + {"-0377\n", &intVal, -0377}, + {"-0o377\n", &intVal, -0377}, + {"0\n", &uintVal, uint(0)}, + {"000\n", &uintVal, uint(0)}, + {"0x10\n", &uintVal, uint(0x10)}, + {"0377\n", &uintVal, uint(0377)}, + {"22\n", &int8Val, int8(22)}, + {"23\n", &int16Val, int16(23)}, + {"24\n", &int32Val, int32(24)}, + {"25\n", &int64Val, int64(25)}, + {"127\n", &int8Val, int8(127)}, + {"-21\n", &intVal, -21}, + {"-22\n", &int8Val, int8(-22)}, + {"-23\n", &int16Val, int16(-23)}, + {"-24\n", &int32Val, int32(-24)}, + {"-25\n", &int64Val, int64(-25)}, + {"-128\n", &int8Val, int8(-128)}, + {"+21\n", &intVal, +21}, + {"+22\n", &int8Val, int8(+22)}, + {"+23\n", &int16Val, int16(+23)}, + {"+24\n", &int32Val, int32(+24)}, + {"+25\n", &int64Val, int64(+25)}, + {"+127\n", &int8Val, int8(+127)}, + {"26\n", &uintVal, uint(26)}, + {"27\n", &uint8Val, uint8(27)}, + {"28\n", &uint16Val, uint16(28)}, + {"29\n", &uint32Val, uint32(29)}, + {"30\n", &uint64Val, uint64(30)}, + {"31\n", &uintptrVal, uintptr(31)}, + {"255\n", &uint8Val, uint8(255)}, + {"32767\n", &int16Val, int16(32767)}, + {"2.3\n", &float64Val, 2.3}, + {"2.3e1\n", &float32Val, float32(2.3e1)}, + {"2.3e2\n", &float64Val, 2.3e2}, + {"2.3p2\n", &float64Val, 2.3 * 4}, + {"2.3p+2\n", &float64Val, 2.3 * 4}, + {"2.3p+66\n", &float64Val, 2.3 * (1 << 66)}, + {"2.3p-66\n", &float64Val, 2.3 / (1 << 66)}, + {"0x2.3p-66\n", &float64Val, float64(0x23) / (1 << 70)}, + {"2_3.4_5\n", &float64Val, 23.45}, + {"2.35\n", &stringVal, "2.35"}, + {"2345678\n", &bytesVal, []byte("2345678")}, + {"(3.4e1-2i)\n", &complex128Val, 3.4e1 - 2i}, + {"-3.45e1-3i\n", &complex64Val, complex64(-3.45e1 - 3i)}, + {"-.45e1-1e2i\n", &complex128Val, complex128(-.45e1 - 100i)}, + {"-.4_5e1-1E2i\n", &complex128Val, complex128(-.45e1 - 100i)}, + {"0x1.0p1+0x1.0P2i\n", &complex128Val, complex128(2 + 4i)}, + {"-0x1p1-0x1p2i\n", &complex128Val, complex128(-2 - 4i)}, + {"-0x1ep-1-0x1p2i\n", &complex128Val, complex128(-15 - 4i)}, + {"-0x1_Ep-1-0x1p0_2i\n", &complex128Val, complex128(-15 - 4i)}, + {"hello\n", &stringVal, "hello"}, + + // Carriage-return followed by newline. (We treat \r\n as \n always.) + {"hello\r\n", &stringVal, "hello"}, + {"27\r\n", &uint8Val, uint8(27)}, + + // Renamed types + {"true\n", &renamedBoolVal, renamedBool(true)}, + {"F\n", &renamedBoolVal, renamedBool(false)}, + {"101\n", &renamedIntVal, renamedInt(101)}, + {"102\n", &renamedIntVal, renamedInt(102)}, + {"103\n", &renamedUintVal, renamedUint(103)}, + {"104\n", &renamedUintVal, renamedUint(104)}, + {"105\n", &renamedInt8Val, renamedInt8(105)}, + {"106\n", &renamedInt16Val, renamedInt16(106)}, + {"107\n", &renamedInt32Val, renamedInt32(107)}, + {"108\n", &renamedInt64Val, renamedInt64(108)}, + {"109\n", &renamedUint8Val, renamedUint8(109)}, + {"110\n", &renamedUint16Val, renamedUint16(110)}, + {"111\n", &renamedUint32Val, renamedUint32(111)}, + {"112\n", &renamedUint64Val, renamedUint64(112)}, + {"113\n", &renamedUintptrVal, renamedUintptr(113)}, + {"114\n", &renamedStringVal, renamedString("114")}, + {"115\n", &renamedBytesVal, renamedBytes([]byte("115"))}, + + // Custom scanners. + {" vvv ", &xVal, Xs("vvv")}, + {" 1234hello", &intStringVal, IntString{1234, "hello"}}, + + // Fixed bugs + {"2147483648\n", &int64Val, int64(2147483648)}, // was: integer overflow +} + +var scanfTests = []ScanfTest{ + {"%v", "TRUE\n", &boolVal, true}, + {"%t", "false\n", &boolVal, false}, + {"%v", "-71\n", &intVal, -71}, + {"%v", "-7_1\n", &intVal, -71}, + {"%v", "0b111\n", &intVal, 7}, + {"%v", "0b_1_1_1\n", &intVal, 7}, + {"%v", "0377\n", &intVal, 0377}, + {"%v", "0_3_7_7\n", &intVal, 0377}, + {"%v", "0o377\n", &intVal, 0377}, + {"%v", "0o_3_7_7\n", &intVal, 0377}, + {"%v", "0x44\n", &intVal, 0x44}, + {"%v", "0x_4_4\n", &intVal, 0x44}, + {"%d", "72\n", &intVal, 72}, + {"%c", "a\n", &runeVal, 'a'}, + {"%c", "\u5072\n", &runeVal, '\u5072'}, + {"%c", "\u1234\n", &runeVal, '\u1234'}, + {"%d", "73\n", &int8Val, int8(73)}, + {"%d", "+74\n", &int16Val, int16(74)}, + {"%d", "75\n", &int32Val, int32(75)}, + {"%d", "76\n", &int64Val, int64(76)}, + {"%b", "1001001\n", &intVal, 73}, + {"%o", "075\n", &intVal, 075}, + {"%x", "a75\n", &intVal, 0xa75}, + {"%v", "71\n", &uintVal, uint(71)}, + {"%d", "72\n", &uintVal, uint(72)}, + {"%d", "7_2\n", &uintVal, uint(7)}, // only %v takes underscores + {"%d", "73\n", &uint8Val, uint8(73)}, + {"%d", "74\n", &uint16Val, uint16(74)}, + {"%d", "75\n", &uint32Val, uint32(75)}, + {"%d", "76\n", &uint64Val, uint64(76)}, + {"%d", "77\n", &uintptrVal, uintptr(77)}, + {"%b", "1001001\n", &uintVal, uint(73)}, + {"%b", "100_1001\n", &uintVal, uint(4)}, + {"%o", "075\n", &uintVal, uint(075)}, + {"%o", "07_5\n", &uintVal, uint(07)}, // only %v takes underscores + {"%x", "a75\n", &uintVal, uint(0xa75)}, + {"%x", "A75\n", &uintVal, uint(0xa75)}, + {"%x", "A7_5\n", &uintVal, uint(0xa7)}, // only %v takes underscores + {"%U", "U+1234\n", &intVal, int(0x1234)}, + {"%U", "U+4567\n", &uintVal, uint(0x4567)}, + + {"%e", "2.3\n", &float64Val, 2.3}, + {"%E", "2.3e1\n", &float32Val, float32(2.3e1)}, + {"%f", "2.3e2\n", &float64Val, 2.3e2}, + {"%g", "2.3p2\n", &float64Val, 2.3 * 4}, + {"%G", "2.3p+2\n", &float64Val, 2.3 * 4}, + {"%v", "2.3p+66\n", &float64Val, 2.3 * (1 << 66)}, + {"%f", "2.3p-66\n", &float64Val, 2.3 / (1 << 66)}, + {"%G", "0x2.3p-66\n", &float64Val, float64(0x23) / (1 << 70)}, + {"%E", "2_3.4_5\n", &float64Val, 23.45}, + + // Strings + {"%s", "using-%s\n", &stringVal, "using-%s"}, + {"%x", "7573696e672d2578\n", &stringVal, "using-%x"}, + {"%X", "7573696E672D2558\n", &stringVal, "using-%X"}, + {"%q", `"quoted\twith\\do\u0075bl\x65s"` + "\n", &stringVal, "quoted\twith\\doubles"}, + {"%q", "`quoted with backs`\n", &stringVal, "quoted with backs"}, + + // Byte slices + {"%s", "bytes-%s\n", &bytesVal, []byte("bytes-%s")}, + {"%x", "62797465732d2578\n", &bytesVal, []byte("bytes-%x")}, + {"%X", "62797465732D2558\n", &bytesVal, []byte("bytes-%X")}, + {"%q", `"bytes\rwith\vdo\u0075bl\x65s"` + "\n", &bytesVal, []byte("bytes\rwith\vdoubles")}, + {"%q", "`bytes with backs`\n", &bytesVal, []byte("bytes with backs")}, + + // Renamed types + {"%v\n", "true\n", &renamedBoolVal, renamedBool(true)}, + {"%t\n", "F\n", &renamedBoolVal, renamedBool(false)}, + {"%v", "101\n", &renamedIntVal, renamedInt(101)}, + {"%c", "\u0101\n", &renamedIntVal, renamedInt('\u0101')}, + {"%o", "0146\n", &renamedIntVal, renamedInt(102)}, + {"%v", "103\n", &renamedUintVal, renamedUint(103)}, + {"%d", "104\n", &renamedUintVal, renamedUint(104)}, + {"%d", "105\n", &renamedInt8Val, renamedInt8(105)}, + {"%d", "106\n", &renamedInt16Val, renamedInt16(106)}, + {"%d", "107\n", &renamedInt32Val, renamedInt32(107)}, + {"%d", "108\n", &renamedInt64Val, renamedInt64(108)}, + {"%x", "6D\n", &renamedUint8Val, renamedUint8(109)}, + {"%o", "0156\n", &renamedUint16Val, renamedUint16(110)}, + {"%d", "111\n", &renamedUint32Val, renamedUint32(111)}, + {"%d", "112\n", &renamedUint64Val, renamedUint64(112)}, + {"%d", "113\n", &renamedUintptrVal, renamedUintptr(113)}, + {"%s", "114\n", &renamedStringVal, renamedString("114")}, + {"%q", "\"1155\"\n", &renamedBytesVal, renamedBytes([]byte("1155"))}, + {"%g", "116e1\n", &renamedFloat32Val, renamedFloat32(116e1)}, + {"%g", "-11.7e+1", &renamedFloat64Val, renamedFloat64(-11.7e+1)}, + {"%g", "11+6e1i\n", &renamedComplex64Val, renamedComplex64(11 + 6e1i)}, + {"%g", "-11.+7e+1i", &renamedComplex128Val, renamedComplex128(-11. + 7e+1i)}, + + // Interesting formats + {"here is\tthe value:%d", "here is the\tvalue:118\n", &intVal, 118}, + {"%% %%:%d", "% %:119\n", &intVal, 119}, + {"%d%%", "42%", &intVal, 42}, // %% at end of string. + + // Corner cases + {"%x", "FFFFFFFF\n", &uint32Val, uint32(0xFFFFFFFF)}, + + // Custom scanner. + {"%s", " sss ", &xVal, Xs("sss")}, + {"%2s", "sssss", &xVal, Xs("ss")}, + + // Fixed bugs + {"%d\n", "27\n", &intVal, 27}, // ok + {"%d\n", "28 \n", &intVal, 28}, // was: "unexpected newline" + {"%v", "0", &intVal, 0}, // was: "EOF"; 0 was taken as base prefix and not counted. + {"%v", "0", &uintVal, uint(0)}, // was: "EOF"; 0 was taken as base prefix and not counted. + {"%c", " ", &uintVal, uint(' ')}, // %c must accept a blank. + {"%c", "\t", &uintVal, uint('\t')}, // %c must accept any space. + {"%c", "\n", &uintVal, uint('\n')}, // %c must accept any space. + {"%d%%", "23%\n", &uintVal, uint(23)}, // %% matches literal %. + {"%%%d", "%23\n", &uintVal, uint(23)}, // %% matches literal %. + + // space handling + {"%d", "27", &intVal, 27}, + {"%d", "27 ", &intVal, 27}, + {"%d", " 27", &intVal, 27}, + {"%d", " 27 ", &intVal, 27}, + + {"X%d", "X27", &intVal, 27}, + {"X%d", "X27 ", &intVal, 27}, + {"X%d", "X 27", &intVal, 27}, + {"X%d", "X 27 ", &intVal, 27}, + + {"X %d", "X27", &intVal, nil}, // expected space in input to match format + {"X %d", "X27 ", &intVal, nil}, // expected space in input to match format + {"X %d", "X 27", &intVal, 27}, + {"X %d", "X 27 ", &intVal, 27}, + + {"%dX", "27X", &intVal, 27}, + {"%dX", "27 X", &intVal, nil}, // input does not match format + {"%dX", " 27X", &intVal, 27}, + {"%dX", " 27 X", &intVal, nil}, // input does not match format + + {"%d X", "27X", &intVal, nil}, // expected space in input to match format + {"%d X", "27 X", &intVal, 27}, + {"%d X", " 27X", &intVal, nil}, // expected space in input to match format + {"%d X", " 27 X", &intVal, 27}, + + {"X %d X", "X27X", &intVal, nil}, // expected space in input to match format + {"X %d X", "X27 X", &intVal, nil}, // expected space in input to match format + {"X %d X", "X 27X", &intVal, nil}, // expected space in input to match format + {"X %d X", "X 27 X", &intVal, 27}, + + {"X %s X", "X27X", &stringVal, nil}, // expected space in input to match format + {"X %s X", "X27 X", &stringVal, nil}, // expected space in input to match format + {"X %s X", "X 27X", &stringVal, nil}, // unexpected EOF + {"X %s X", "X 27 X", &stringVal, "27"}, + + {"X%sX", "X27X", &stringVal, nil}, // unexpected EOF + {"X%sX", "X27 X", &stringVal, nil}, // input does not match format + {"X%sX", "X 27X", &stringVal, nil}, // unexpected EOF + {"X%sX", "X 27 X", &stringVal, nil}, // input does not match format + + {"X%s", "X27", &stringVal, "27"}, + {"X%s", "X27 ", &stringVal, "27"}, + {"X%s", "X 27", &stringVal, "27"}, + {"X%s", "X 27 ", &stringVal, "27"}, + + {"X%dX", "X27X", &intVal, 27}, + {"X%dX", "X27 X", &intVal, nil}, // input does not match format + {"X%dX", "X 27X", &intVal, 27}, + {"X%dX", "X 27 X", &intVal, nil}, // input does not match format + + {"X%dX", "X27X", &intVal, 27}, + {"X%dX", "X27X ", &intVal, 27}, + {"X%dX", " X27X", &intVal, nil}, // input does not match format + {"X%dX", " X27X ", &intVal, nil}, // input does not match format + + {"X%dX\n", "X27X", &intVal, 27}, + {"X%dX \n", "X27X ", &intVal, 27}, + {"X%dX\n", "X27X\n", &intVal, 27}, + {"X%dX\n", "X27X \n", &intVal, 27}, + + {"X%dX \n", "X27X", &intVal, 27}, + {"X%dX \n", "X27X ", &intVal, 27}, + {"X%dX \n", "X27X\n", &intVal, 27}, + {"X%dX \n", "X27X \n", &intVal, 27}, + + {"X%c", "X\n", &runeVal, '\n'}, + {"X%c", "X \n", &runeVal, ' '}, + {"X %c", "X!", &runeVal, nil}, // expected space in input to match format + {"X %c", "X\n", &runeVal, nil}, // newline in input does not match format + {"X %c", "X !", &runeVal, '!'}, + {"X %c", "X \n", &runeVal, '\n'}, + + {" X%dX", "X27X", &intVal, nil}, // expected space in input to match format + {" X%dX", "X27X ", &intVal, nil}, // expected space in input to match format + {" X%dX", " X27X", &intVal, 27}, + {" X%dX", " X27X ", &intVal, 27}, + + {"X%dX ", "X27X", &intVal, 27}, + {"X%dX ", "X27X ", &intVal, 27}, + {"X%dX ", " X27X", &intVal, nil}, // input does not match format + {"X%dX ", " X27X ", &intVal, nil}, // input does not match format + + {" X%dX ", "X27X", &intVal, nil}, // expected space in input to match format + {" X%dX ", "X27X ", &intVal, nil}, // expected space in input to match format + {" X%dX ", " X27X", &intVal, 27}, + {" X%dX ", " X27X ", &intVal, 27}, + + {"%d\nX", "27\nX", &intVal, 27}, + {"%dX\n X", "27X\n X", &intVal, 27}, +} + +var overflowTests = []ScanTest{ + {"128", &int8Val, 0}, + {"32768", &int16Val, 0}, + {"-129", &int8Val, 0}, + {"-32769", &int16Val, 0}, + {"256", &uint8Val, 0}, + {"65536", &uint16Val, 0}, + {"1e100", &float32Val, 0}, + {"1e500", &float64Val, 0}, + {"(1e100+0i)", &complex64Val, 0}, + {"(1+1e100i)", &complex64Val, 0}, + {"(1-1e500i)", &complex128Val, 0}, +} + +var truth bool +var i, j, k int +var f float64 +var s, t string +var c complex128 +var x, y Xs +var z IntString +var r1, r2, r3 rune + +var multiTests = []ScanfMultiTest{ + {"", "", []any{}, []any{}, ""}, + {"%d", "23", args(&i), args(23), ""}, + {"%2s%3s", "22333", args(&s, &t), args("22", "333"), ""}, + {"%2d%3d", "44555", args(&i, &j), args(44, 555), ""}, + {"%2d.%3d", "66.777", args(&i, &j), args(66, 777), ""}, + {"%d, %d", "23, 18", args(&i, &j), args(23, 18), ""}, + {"%3d22%3d", "33322333", args(&i, &j), args(333, 333), ""}, + {"%6vX=%3fY", "3+2iX=2.5Y", args(&c, &f), args((3 + 2i), 2.5), ""}, + {"%d%s", "123abc", args(&i, &s), args(123, "abc"), ""}, + {"%c%c%c", "2\u50c2X", args(&r1, &r2, &r3), args('2', '\u50c2', 'X'), ""}, + {"%5s%d", " 1234567 ", args(&s, &i), args("12345", 67), ""}, + {"%5s%d", " 12 34 567 ", args(&s, &i), args("12", 34), ""}, + + // Custom scanners. + {"%e%f", "eefffff", args(&x, &y), args(Xs("ee"), Xs("fffff")), ""}, + {"%4v%s", "12abcd", args(&z, &s), args(IntString{12, "ab"}, "cd"), ""}, + + // Errors + {"%t", "23 18", args(&i), nil, "bad verb"}, + {"%d %d %d", "23 18", args(&i, &j), args(23, 18), "too few operands"}, + {"%d %d", "23 18 27", args(&i, &j, &k), args(23, 18), "too many operands"}, + {"%c", "\u0100", args(&int8Val), nil, "overflow"}, + {"X%d", "10X", args(&intVal), nil, "input does not match format"}, + {"%d%", "42%", args(&intVal), args(42), "missing verb: % at end of format string"}, + {"%d% ", "42%", args(&intVal), args(42), "too few operands for format '% '"}, // Slightly odd error, but correct. + {"%%%d", "xxx 42", args(&intVal), args(42), "missing literal %"}, + {"%%%d", "x42", args(&intVal), args(42), "missing literal %"}, + {"%%%d", "42", args(&intVal), args(42), "missing literal %"}, + + // Bad UTF-8: should see every byte. + {"%c%c%c", "\xc2X\xc2", args(&r1, &r2, &r3), args(utf8.RuneError, 'X', utf8.RuneError), ""}, + + // Fixed bugs + {"%v%v", "FALSE23", args(&truth, &i), args(false, 23), ""}, +} + +var readers = []struct { + name string + f func(string) io.Reader +}{ + {"StringReader", func(s string) io.Reader { + return strings.NewReader(s) + }}, + {"ReaderOnly", func(s string) io.Reader { + return struct{ io.Reader }{strings.NewReader(s)} + }}, + {"OneByteReader", func(s string) io.Reader { + return iotest.OneByteReader(strings.NewReader(s)) + }}, + {"DataErrReader", func(s string) io.Reader { + return iotest.DataErrReader(strings.NewReader(s)) + }}, +} + +func testScan(t *testing.T, f func(string) io.Reader, scan func(r io.Reader, a ...any) (int, error)) { + for _, test := range scanTests { + r := f(test.text) + n, err := scan(r, test.in) + if err != nil { + m := "" + if n > 0 { + m = Sprintf(" (%d fields ok)", n) + } + t.Errorf("got error scanning %q: %s%s", test.text, err, m) + continue + } + if n != 1 { + t.Errorf("count error on entry %q: got %d", test.text, n) + continue + } + // The incoming value may be a pointer + v := reflect.ValueOf(test.in) + if p := v; p.Kind() == reflect.Pointer { + v = p.Elem() + } + val := v.Interface() + if !reflect.DeepEqual(val, test.out) { + t.Errorf("scanning %q: expected %#v got %#v, type %T", test.text, test.out, val, val) + } + } +} + +func TestScan(t *testing.T) { + for _, r := range readers { + t.Run(r.name, func(t *testing.T) { + testScan(t, r.f, Fscan) + }) + } +} + +func TestScanln(t *testing.T) { + for _, r := range readers { + t.Run(r.name, func(t *testing.T) { + testScan(t, r.f, Fscanln) + }) + } +} + +func TestScanf(t *testing.T) { + for _, test := range scanfTests { + n, err := Sscanf(test.text, test.format, test.in) + if err != nil { + if test.out != nil { + t.Errorf("Sscanf(%q, %q): unexpected error: %v", test.text, test.format, err) + } + continue + } + if test.out == nil { + t.Errorf("Sscanf(%q, %q): unexpected success", test.text, test.format) + continue + } + if n != 1 { + t.Errorf("Sscanf(%q, %q): parsed %d field, want 1", test.text, test.format, n) + continue + } + // The incoming value may be a pointer + v := reflect.ValueOf(test.in) + if p := v; p.Kind() == reflect.Pointer { + v = p.Elem() + } + val := v.Interface() + if !reflect.DeepEqual(val, test.out) { + t.Errorf("Sscanf(%q, %q): parsed value %T(%#v), want %T(%#v)", test.text, test.format, val, val, test.out, test.out) + } + } +} + +func TestScanOverflow(t *testing.T) { + // different machines and different types report errors with different strings. + re := regexp.MustCompile("overflow|too large|out of range|not representable") + for _, test := range overflowTests { + _, err := Sscan(test.text, test.in) + if err == nil { + t.Errorf("expected overflow scanning %q", test.text) + continue + } + if !re.MatchString(err.Error()) { + t.Errorf("expected overflow error scanning %q: %s", test.text, err) + } + } +} + +func verifyNaN(str string, t *testing.T) { + var f float64 + var f32 float32 + var f64 float64 + text := str + " " + str + " " + str + n, err := Fscan(strings.NewReader(text), &f, &f32, &f64) + if err != nil { + t.Errorf("got error scanning %q: %s", text, err) + } + if n != 3 { + t.Errorf("count error scanning %q: got %d", text, n) + } + if !math.IsNaN(float64(f)) || !math.IsNaN(float64(f32)) || !math.IsNaN(f64) { + t.Errorf("didn't get NaNs scanning %q: got %g %g %g", text, f, f32, f64) + } +} + +func TestNaN(t *testing.T) { + for _, s := range []string{"nan", "NAN", "NaN"} { + verifyNaN(s, t) + } +} + +func verifyInf(str string, t *testing.T) { + var f float64 + var f32 float32 + var f64 float64 + text := str + " " + str + " " + str + n, err := Fscan(strings.NewReader(text), &f, &f32, &f64) + if err != nil { + t.Errorf("got error scanning %q: %s", text, err) + } + if n != 3 { + t.Errorf("count error scanning %q: got %d", text, n) + } + sign := 1 + if str[0] == '-' { + sign = -1 + } + if !math.IsInf(float64(f), sign) || !math.IsInf(float64(f32), sign) || !math.IsInf(f64, sign) { + t.Errorf("didn't get right Infs scanning %q: got %g %g %g", text, f, f32, f64) + } +} + +func TestInf(t *testing.T) { + for _, s := range []string{"inf", "+inf", "-inf", "INF", "-INF", "+INF", "Inf", "-Inf", "+Inf"} { + verifyInf(s, t) + } +} + +func testScanfMulti(t *testing.T, f func(string) io.Reader) { + sliceType := reflect.TypeOf(make([]any, 1)) + for _, test := range multiTests { + r := f(test.text) + n, err := Fscanf(r, test.format, test.in...) + if err != nil { + if test.err == "" { + t.Errorf("got error scanning (%q, %q): %q", test.format, test.text, err) + } else if !strings.Contains(err.Error(), test.err) { + t.Errorf("got wrong error scanning (%q, %q): %q; expected %q", test.format, test.text, err, test.err) + } + continue + } + if test.err != "" { + t.Errorf("expected error %q error scanning (%q, %q)", test.err, test.format, test.text) + } + if n != len(test.out) { + t.Errorf("count error on entry (%q, %q): expected %d got %d", test.format, test.text, len(test.out), n) + continue + } + // Convert the slice of pointers into a slice of values + resultVal := reflect.MakeSlice(sliceType, n, n) + for i := 0; i < n; i++ { + v := reflect.ValueOf(test.in[i]).Elem() + resultVal.Index(i).Set(v) + } + result := resultVal.Interface() + if !reflect.DeepEqual(result, test.out) { + t.Errorf("scanning (%q, %q): expected %#v got %#v", test.format, test.text, test.out, result) + } + } +} + +func TestScanfMulti(t *testing.T) { + for _, r := range readers { + t.Run(r.name, func(t *testing.T) { + testScanfMulti(t, r.f) + }) + } +} + +func TestScanMultiple(t *testing.T) { + var a int + var s string + n, err := Sscan("123abc", &a, &s) + if n != 2 { + t.Errorf("Sscan count error: expected 2: got %d", n) + } + if err != nil { + t.Errorf("Sscan expected no error; got %s", err) + } + if a != 123 || s != "abc" { + t.Errorf("Sscan wrong values: got (%d %q) expected (123 \"abc\")", a, s) + } + n, err = Sscan("asdf", &s, &a) + if n != 1 { + t.Errorf("Sscan count error: expected 1: got %d", n) + } + if err == nil { + t.Errorf("Sscan expected error; got none: %s", err) + } + if s != "asdf" { + t.Errorf("Sscan wrong values: got %q expected \"asdf\"", s) + } +} + +// Empty strings are not valid input when scanning a string. +func TestScanEmpty(t *testing.T) { + var s1, s2 string + n, err := Sscan("abc", &s1, &s2) + if n != 1 { + t.Errorf("Sscan count error: expected 1: got %d", n) + } + if err == nil { + t.Error("Sscan <one item> expected error; got none") + } + if s1 != "abc" { + t.Errorf("Sscan wrong values: got %q expected \"abc\"", s1) + } + n, err = Sscan("", &s1, &s2) + if n != 0 { + t.Errorf("Sscan count error: expected 0: got %d", n) + } + if err == nil { + t.Error("Sscan <empty> expected error; got none") + } + // Quoted empty string is OK. + n, err = Sscanf(`""`, "%q", &s1) + if n != 1 { + t.Errorf("Sscanf count error: expected 1: got %d", n) + } + if err != nil { + t.Errorf("Sscanf <empty> expected no error with quoted string; got %s", err) + } +} + +func TestScanNotPointer(t *testing.T) { + r := strings.NewReader("1") + var a int + _, err := Fscan(r, a) + if err == nil { + t.Error("expected error scanning non-pointer") + } else if !strings.Contains(err.Error(), "pointer") { + t.Errorf("expected pointer error scanning non-pointer, got: %s", err) + } +} + +func TestScanlnNoNewline(t *testing.T) { + var a int + _, err := Sscanln("1 x\n", &a) + if err == nil { + t.Error("expected error scanning string missing newline") + } else if !strings.Contains(err.Error(), "newline") { + t.Errorf("expected newline error scanning string missing newline, got: %s", err) + } +} + +func TestScanlnWithMiddleNewline(t *testing.T) { + r := strings.NewReader("123\n456\n") + var a, b int + _, err := Fscanln(r, &a, &b) + if err == nil { + t.Error("expected error scanning string with extra newline") + } else if !strings.Contains(err.Error(), "newline") { + t.Errorf("expected newline error scanning string with extra newline, got: %s", err) + } +} + +// eofCounter is a special Reader that counts reads at end of file. +type eofCounter struct { + reader *strings.Reader + eofCount int +} + +func (ec *eofCounter) Read(b []byte) (n int, err error) { + n, err = ec.reader.Read(b) + if n == 0 { + ec.eofCount++ + } + return +} + +// TestEOF verifies that when we scan, we see at most EOF once per call to a +// Scan function, and then only when it's really an EOF. +func TestEOF(t *testing.T) { + ec := &eofCounter{strings.NewReader("123\n"), 0} + var a int + n, err := Fscanln(ec, &a) + if err != nil { + t.Error("unexpected error", err) + } + if n != 1 { + t.Error("expected to scan one item, got", n) + } + if ec.eofCount != 0 { + t.Error("expected zero EOFs", ec.eofCount) + ec.eofCount = 0 // reset for next test + } + n, err = Fscanln(ec, &a) + if err == nil { + t.Error("expected error scanning empty string") + } + if n != 0 { + t.Error("expected to scan zero items, got", n) + } + if ec.eofCount != 1 { + t.Error("expected one EOF, got", ec.eofCount) + } +} + +// TestEOFAtEndOfInput verifies that we see an EOF error if we run out of input. +// This was a buglet: we used to get "expected integer". +func TestEOFAtEndOfInput(t *testing.T) { + var i, j int + n, err := Sscanf("23", "%d %d", &i, &j) + if n != 1 || i != 23 { + t.Errorf("Sscanf expected one value of 23; got %d %d", n, i) + } + if err != io.EOF { + t.Errorf("Sscanf expected EOF; got %q", err) + } + n, err = Sscan("234", &i, &j) + if n != 1 || i != 234 { + t.Errorf("Sscan expected one value of 234; got %d %d", n, i) + } + if err != io.EOF { + t.Errorf("Sscan expected EOF; got %q", err) + } + // Trailing space is tougher. + n, err = Sscan("234 ", &i, &j) + if n != 1 || i != 234 { + t.Errorf("Sscan expected one value of 234; got %d %d", n, i) + } + if err != io.EOF { + t.Errorf("Sscan expected EOF; got %q", err) + } +} + +var eofTests = []struct { + format string + v any +}{ + {"%s", &stringVal}, + {"%q", &stringVal}, + {"%x", &stringVal}, + {"%v", &stringVal}, + {"%v", &bytesVal}, + {"%v", &intVal}, + {"%v", &uintVal}, + {"%v", &boolVal}, + {"%v", &float32Val}, + {"%v", &complex64Val}, + {"%v", &renamedStringVal}, + {"%v", &renamedBytesVal}, + {"%v", &renamedIntVal}, + {"%v", &renamedUintVal}, + {"%v", &renamedBoolVal}, + {"%v", &renamedFloat32Val}, + {"%v", &renamedComplex64Val}, +} + +func TestEOFAllTypes(t *testing.T) { + for i, test := range eofTests { + if _, err := Sscanf("", test.format, test.v); err != io.EOF { + t.Errorf("#%d: %s %T not eof on empty string: %s", i, test.format, test.v, err) + } + if _, err := Sscanf(" ", test.format, test.v); err != io.EOF { + t.Errorf("#%d: %s %T not eof on trailing blanks: %s", i, test.format, test.v, err) + } + } +} + +// TestUnreadRuneWithBufio verifies that, at least when using bufio, successive +// calls to Fscan do not lose runes. +func TestUnreadRuneWithBufio(t *testing.T) { + r := bufio.NewReader(strings.NewReader("123αb")) + var i int + var a string + n, err := Fscanf(r, "%d", &i) + if n != 1 || err != nil { + t.Errorf("reading int expected one item, no errors; got %d %q", n, err) + } + if i != 123 { + t.Errorf("expected 123; got %d", i) + } + n, err = Fscanf(r, "%s", &a) + if n != 1 || err != nil { + t.Errorf("reading string expected one item, no errors; got %d %q", n, err) + } + if a != "αb" { + t.Errorf("expected αb; got %q", a) + } +} + +type TwoLines string + +// Scan attempts to read two lines into the object. Scanln should prevent this +// because it stops at newline; Scan and Scanf should be fine. +func (t *TwoLines) Scan(state ScanState, verb rune) error { + chars := make([]rune, 0, 100) + for nlCount := 0; nlCount < 2; { + c, _, err := state.ReadRune() + if err != nil { + return err + } + chars = append(chars, c) + if c == '\n' { + nlCount++ + } + } + *t = TwoLines(string(chars)) + return nil +} + +func TestMultiLine(t *testing.T) { + input := "abc\ndef\n" + // Sscan should work + var tscan TwoLines + n, err := Sscan(input, &tscan) + if n != 1 { + t.Errorf("Sscan: expected 1 item; got %d", n) + } + if err != nil { + t.Errorf("Sscan: expected no error; got %s", err) + } + if string(tscan) != input { + t.Errorf("Sscan: expected %q; got %q", input, tscan) + } + // Sscanf should work + var tscanf TwoLines + n, err = Sscanf(input, "%s", &tscanf) + if n != 1 { + t.Errorf("Sscanf: expected 1 item; got %d", n) + } + if err != nil { + t.Errorf("Sscanf: expected no error; got %s", err) + } + if string(tscanf) != input { + t.Errorf("Sscanf: expected %q; got %q", input, tscanf) + } + // Sscanln should not work + var tscanln TwoLines + n, err = Sscanln(input, &tscanln) + if n != 0 { + t.Errorf("Sscanln: expected 0 items; got %d: %q", n, tscanln) + } + if err == nil { + t.Error("Sscanln: expected error; got none") + } else if err != io.ErrUnexpectedEOF { + t.Errorf("Sscanln: expected io.ErrUnexpectedEOF (ha!); got %s", err) + } +} + +// TestLineByLineFscanf tests that Fscanf does not read past newline. Issue +// 3481. +func TestLineByLineFscanf(t *testing.T) { + r := struct{ io.Reader }{strings.NewReader("1\n2\n")} + var i, j int + n, err := Fscanf(r, "%v\n", &i) + if n != 1 || err != nil { + t.Fatalf("first read: %d %q", n, err) + } + n, err = Fscanf(r, "%v\n", &j) + if n != 1 || err != nil { + t.Fatalf("second read: %d %q", n, err) + } + if i != 1 || j != 2 { + t.Errorf("wrong values; wanted 1 2 got %d %d", i, j) + } +} + +// TestScanStateCount verifies the correct byte count is returned. Issue 8512. + +// runeScanner implements the Scanner interface for TestScanStateCount. +type runeScanner struct { + rune rune + size int +} + +func (rs *runeScanner) Scan(state ScanState, verb rune) error { + r, size, err := state.ReadRune() + rs.rune = r + rs.size = size + return err +} + +func TestScanStateCount(t *testing.T) { + var a, b, c runeScanner + n, err := Sscanf("12➂", "%c%c%c", &a, &b, &c) + if err != nil { + t.Fatal(err) + } + if n != 3 { + t.Fatalf("expected 3 items consumed, got %d", n) + } + if a.rune != '1' || b.rune != '2' || c.rune != '➂' { + t.Errorf("bad scan rune: %q %q %q should be '1' '2' '➂'", a.rune, b.rune, c.rune) + } + if a.size != 1 || b.size != 1 || c.size != 3 { + t.Errorf("bad scan size: %q %q %q should be 1 1 3", a.size, b.size, c.size) + } +} + +// RecursiveInt accepts a string matching %d.%d.%d.... +// and parses it into a linked list. +// It allows us to benchmark recursive descent style scanners. +type RecursiveInt struct { + i int + next *RecursiveInt +} + +func (r *RecursiveInt) Scan(state ScanState, verb rune) (err error) { + _, err = Fscan(state, &r.i) + if err != nil { + return + } + next := new(RecursiveInt) + _, err = Fscanf(state, ".%v", next) + if err != nil { + if err == io.ErrUnexpectedEOF { + err = nil + } + return + } + r.next = next + return +} + +// scanInts performs the same scanning task as RecursiveInt.Scan +// but without recurring through scanner, so we can compare +// performance more directly. +func scanInts(r *RecursiveInt, b *bytes.Buffer) (err error) { + r.next = nil + _, err = Fscan(b, &r.i) + if err != nil { + return + } + c, _, err := b.ReadRune() + if err != nil { + if err == io.EOF { + err = nil + } + return + } + if c != '.' { + return + } + next := new(RecursiveInt) + err = scanInts(next, b) + if err == nil { + r.next = next + } + return +} + +func makeInts(n int) []byte { + var buf bytes.Buffer + Fprintf(&buf, "1") + for i := 1; i < n; i++ { + Fprintf(&buf, ".%d", i+1) + } + return buf.Bytes() +} + +func TestScanInts(t *testing.T) { + testScanInts(t, scanInts) + testScanInts(t, func(r *RecursiveInt, b *bytes.Buffer) (err error) { + _, err = Fscan(b, r) + return + }) +} + +// 800 is small enough to not overflow the stack when using gccgo on a +// platform that does not support split stack. +const intCount = 800 + +func testScanInts(t *testing.T, scan func(*RecursiveInt, *bytes.Buffer) error) { + r := new(RecursiveInt) + ints := makeInts(intCount) + buf := bytes.NewBuffer(ints) + err := scan(r, buf) + if err != nil { + t.Error("unexpected error", err) + } + i := 1 + for ; r != nil; r = r.next { + if r.i != i { + t.Fatalf("bad scan: expected %d got %d", i, r.i) + } + i++ + } + if i-1 != intCount { + t.Fatalf("bad scan count: expected %d got %d", intCount, i-1) + } +} + +func BenchmarkScanInts(b *testing.B) { + b.ResetTimer() + ints := makeInts(intCount) + var r RecursiveInt + for i := b.N - 1; i >= 0; i-- { + buf := bytes.NewBuffer(ints) + b.StartTimer() + scanInts(&r, buf) + b.StopTimer() + } +} + +func BenchmarkScanRecursiveInt(b *testing.B) { + b.ResetTimer() + ints := makeInts(intCount) + var r RecursiveInt + for i := b.N - 1; i >= 0; i-- { + buf := bytes.NewBuffer(ints) + b.StartTimer() + Fscan(buf, &r) + b.StopTimer() + } +} + +func BenchmarkScanRecursiveIntReaderWrapper(b *testing.B) { + b.ResetTimer() + ints := makeInts(intCount) + var r RecursiveInt + for i := b.N - 1; i >= 0; i-- { + buf := struct{ io.Reader }{strings.NewReader(string(ints))} + b.StartTimer() + Fscan(buf, &r) + b.StopTimer() + } +} + +// Issue 9124. +// %x on bytes couldn't handle non-space bytes terminating the scan. +func TestHexBytes(t *testing.T) { + var a, b []byte + n, err := Sscanf("00010203", "%x", &a) + if n != 1 || err != nil { + t.Errorf("simple: got count, err = %d, %v; expected 1, nil", n, err) + } + check := func(msg string, x []byte) { + if len(x) != 4 { + t.Errorf("%s: bad length %d", msg, len(x)) + } + for i, b := range x { + if int(b) != i { + t.Errorf("%s: bad x[%d] = %x", msg, i, x[i]) + } + } + } + check("simple", a) + a = nil + + n, err = Sscanf("00010203 00010203", "%x %x", &a, &b) + if n != 2 || err != nil { + t.Errorf("simple pair: got count, err = %d, %v; expected 2, nil", n, err) + } + check("simple pair a", a) + check("simple pair b", b) + a = nil + b = nil + + n, err = Sscanf("00010203:", "%x", &a) + if n != 1 || err != nil { + t.Errorf("colon: got count, err = %d, %v; expected 1, nil", n, err) + } + check("colon", a) + a = nil + + n, err = Sscanf("00010203:00010203", "%x:%x", &a, &b) + if n != 2 || err != nil { + t.Errorf("colon pair: got count, err = %d, %v; expected 2, nil", n, err) + } + check("colon pair a", a) + check("colon pair b", b) + a = nil + b = nil + + // This one fails because there is a hex byte after the data, + // that is, an odd number of hex input bytes. + n, err = Sscanf("000102034:", "%x", &a) + if n != 0 || err == nil { + t.Errorf("odd count: got count, err = %d, %v; expected 0, error", n, err) + } +} + +func TestScanNewlinesAreSpaces(t *testing.T) { + var a, b int + var tests = []struct { + name string + text string + count int + }{ + {"newlines", "1\n2\n", 2}, + {"no final newline", "1\n2", 2}, + {"newlines with spaces ", "1 \n 2 \n", 2}, + {"no final newline with spaces", "1 \n 2", 2}, + } + for _, test := range tests { + n, err := Sscan(test.text, &a, &b) + if n != test.count { + t.Errorf("%s: expected to scan %d item(s), scanned %d", test.name, test.count, n) + } + if err != nil { + t.Errorf("%s: unexpected error: %s", test.name, err) + } + } +} + +func TestScanlnNewlinesTerminate(t *testing.T) { + var a, b int + var tests = []struct { + name string + text string + count int + ok bool + }{ + {"one line one item", "1\n", 1, false}, + {"one line two items with spaces ", " 1 2 \n", 2, true}, + {"one line two items no newline", " 1 2", 2, true}, + {"two lines two items", "1\n2\n", 1, false}, + } + for _, test := range tests { + n, err := Sscanln(test.text, &a, &b) + if n != test.count { + t.Errorf("%s: expected to scan %d item(s), scanned %d", test.name, test.count, n) + } + if test.ok && err != nil { + t.Errorf("%s: unexpected error: %s", test.name, err) + } + if !test.ok && err == nil { + t.Errorf("%s: expected error; got none", test.name) + } + } +} + +func TestScanfNewlineMatchFormat(t *testing.T) { + var a, b int + var tests = []struct { + name string + text string + format string + count int + ok bool + }{ + {"newline in both", "1\n2", "%d\n%d\n", 2, true}, + {"newline in input", "1\n2", "%d %d", 1, false}, + {"space-newline in input", "1 \n2", "%d %d", 1, false}, + {"newline in format", "1 2", "%d\n%d", 1, false}, + {"space-newline in format", "1 2", "%d \n%d", 1, false}, + {"space-newline in both", "1 \n2", "%d \n%d", 2, true}, + {"extra space in format", "1\n2", "%d\n %d", 2, true}, + {"two extra spaces in format", "1\n2", "%d \n %d", 2, true}, + {"space vs newline 0000", "1\n2", "%d\n%d", 2, true}, + {"space vs newline 0001", "1\n2", "%d\n %d", 2, true}, + {"space vs newline 0010", "1\n2", "%d \n%d", 2, true}, + {"space vs newline 0011", "1\n2", "%d \n %d", 2, true}, + {"space vs newline 0100", "1\n 2", "%d\n%d", 2, true}, + {"space vs newline 0101", "1\n 2", "%d\n%d ", 2, true}, + {"space vs newline 0110", "1\n 2", "%d \n%d", 2, true}, + {"space vs newline 0111", "1\n 2", "%d \n %d", 2, true}, + {"space vs newline 1000", "1 \n2", "%d\n%d", 2, true}, + {"space vs newline 1001", "1 \n2", "%d\n %d", 2, true}, + {"space vs newline 1010", "1 \n2", "%d \n%d", 2, true}, + {"space vs newline 1011", "1 \n2", "%d \n %d", 2, true}, + {"space vs newline 1100", "1 \n 2", "%d\n%d", 2, true}, + {"space vs newline 1101", "1 \n 2", "%d\n %d", 2, true}, + {"space vs newline 1110", "1 \n 2", "%d \n%d", 2, true}, + {"space vs newline 1111", "1 \n 2", "%d \n %d", 2, true}, + {"space vs newline no-percent 0000", "1\n2", "1\n2", 0, true}, + {"space vs newline no-percent 0001", "1\n2", "1\n 2", 0, true}, + {"space vs newline no-percent 0010", "1\n2", "1 \n2", 0, true}, + {"space vs newline no-percent 0011", "1\n2", "1 \n 2", 0, true}, + {"space vs newline no-percent 0100", "1\n 2", "1\n2", 0, false}, // fails: space after nl in input but not pattern + {"space vs newline no-percent 0101", "1\n 2", "1\n2 ", 0, false}, // fails: space after nl in input but not pattern + {"space vs newline no-percent 0110", "1\n 2", "1 \n2", 0, false}, // fails: space after nl in input but not pattern + {"space vs newline no-percent 0111", "1\n 2", "1 \n 2", 0, true}, + {"space vs newline no-percent 1000", "1 \n2", "1\n2", 0, true}, + {"space vs newline no-percent 1001", "1 \n2", "1\n 2", 0, true}, + {"space vs newline no-percent 1010", "1 \n2", "1 \n2", 0, true}, + {"space vs newline no-percent 1011", "1 \n2", "1 \n 2", 0, true}, + {"space vs newline no-percent 1100", "1 \n 2", "1\n2", 0, false}, // fails: space after nl in input but not pattern + {"space vs newline no-percent 1101", "1 \n 2", "1\n 2", 0, true}, + {"space vs newline no-percent 1110", "1 \n 2", "1 \n2", 0, false}, // fails: space after nl in input but not pattern + {"space vs newline no-percent 1111", "1 \n 2", "1 \n 2", 0, true}, + } + for _, test := range tests { + var n int + var err error + if strings.Contains(test.format, "%") { + n, err = Sscanf(test.text, test.format, &a, &b) + } else { + n, err = Sscanf(test.text, test.format) + } + if n != test.count { + t.Errorf("%s: expected to scan %d item(s), scanned %d", test.name, test.count, n) + } + if test.ok && err != nil { + t.Errorf("%s: unexpected error: %s", test.name, err) + } + if !test.ok && err == nil { + t.Errorf("%s: expected error; got none", test.name) + } + } +} + +// Test for issue 12090: Was unreading at EOF, double-scanning a byte. + +type hexBytes [2]byte + +func (h *hexBytes) Scan(ss ScanState, verb rune) error { + var b []byte + _, err := Fscanf(ss, "%4x", &b) + if err != nil { + panic(err) // Really shouldn't happen. + } + copy((*h)[:], b) + return err +} + +func TestHexByte(t *testing.T) { + var h hexBytes + n, err := Sscanln("0123\n", &h) + if err != nil { + t.Fatal(err) + } + if n != 1 { + t.Fatalf("expected 1 item; scanned %d", n) + } + if h[0] != 0x01 || h[1] != 0x23 { + t.Fatalf("expected 0123 got %x", h) + } +} |