Cypherpunks repositories - gostls13.git/blob

2 // Use of this source code is governed by a BSD-style

3 // license that can be found in the LICENSE file.

4

5 // This file contains tests for the printf checker.

6

7 package print

8

9 import (

10 "fmt"

11 logpkg "log" // renamed to make it harder to see

12 "math"

13 "os"

14 "testing"

15 "unsafe" // just for test case printing unsafe.Pointer

16 // For testing printf-like functions from external package.

17 // "github.com/foobar/externalprintf"

18 )

19

20 func UnsafePointerPrintfTest() {

21 var up unsafe.Pointer

22 fmt.Printf("%p, %x %X", up, up, up)

23 }

24

25 // Error methods that do not satisfy the Error interface and should be checked.

26 type errorTest1 int

27

28 func (errorTest1) Error(...interface{}) string {

29 return "hi"

30 }

31

32 type errorTest2 int // Analogous to testing's *T type.

33 func (errorTest2) Error(...interface{}) {

34 }

35

36 type errorTest3 int

37

38 func (errorTest3) Error() { // No return value.

39 }

40

41 type errorTest4 int

42

43 func (errorTest4) Error() int { // Different return type.

44 return 3

45 }

46

47 type errorTest5 int

48

49 func (errorTest5) error() { // niladic; don't complain if no args (was bug)

50 }

51

52 // This function never executes, but it serves as a simple test for the program.

53 // Test with make test.

54 func PrintfTests() {

55 var b bool

56 var i int

57 var r rune

58 var s string

59 var x float64

60 var p *int

61 var imap map[int]int

62 var fslice []float64

63 var c complex64

64 // Some good format/argtypes

65 fmt.Printf("")

66 fmt.Printf("%b %b %b", 3, i, x)

67 fmt.Printf("%c %c %c %c", 3, i, 'x', r)

68 fmt.Printf("%d %d %d", 3, i, imap)

69 fmt.Printf("%e %e %e %e", 3e9, x, fslice, c)

70 fmt.Printf("%E %E %E %E", 3e9, x, fslice, c)

71 fmt.Printf("%f %f %f %f", 3e9, x, fslice, c)

72 fmt.Printf("%F %F %F %F", 3e9, x, fslice, c)

73 fmt.Printf("%g %g %g %g", 3e9, x, fslice, c)

74 fmt.Printf("%G %G %G %G", 3e9, x, fslice, c)

75 fmt.Printf("%b %b %b %b", 3e9, x, fslice, c)

76 fmt.Printf("%o %o", 3, i)

77 fmt.Printf("%p", p)

78 fmt.Printf("%q %q %q %q", 3, i, 'x', r)

79 fmt.Printf("%s %s %s", "hi", s, []byte{65})

80 fmt.Printf("%t %t", true, b)

81 fmt.Printf("%T %T", 3, i)

82 fmt.Printf("%U %U", 3, i)

83 fmt.Printf("%v %v", 3, i)

84 fmt.Printf("%x %x %x %x %x %x %x", 3, i, "hi", s, x, c, fslice)

85 fmt.Printf("%X %X %X %X %X %X %X", 3, i, "hi", s, x, c, fslice)

86 fmt.Printf("%.*s %d %g", 3, "hi", 23, 2.3)

87 fmt.Printf("%s", &stringerv)

88 fmt.Printf("%v", &stringerv)

89 fmt.Printf("%T", &stringerv)

90 fmt.Printf("%s", &embeddedStringerv)

91 fmt.Printf("%v", &embeddedStringerv)

92 fmt.Printf("%T", &embeddedStringerv)

93 fmt.Printf("%v", notstringerv)

94 fmt.Printf("%T", notstringerv)

95 fmt.Printf("%q", stringerarrayv)

96 fmt.Printf("%v", stringerarrayv)

97 fmt.Printf("%s", stringerarrayv)

98 fmt.Printf("%v", notstringerarrayv)

99 fmt.Printf("%T", notstringerarrayv)

100 fmt.Printf("%d", new(fmt.Formatter))

101 fmt.Printf("%*%", 2) // Ridiculous but allowed.

102 fmt.Printf("%s", interface{}(nil)) // Nothing useful we can say.

103

104 fmt.Printf("%g", 1+2i)

105 fmt.Printf("%#e %#E %#f %#F %#g %#G", 1.2, 1.2, 1.2, 1.2, 1.2, 1.2) // OK since Go 1.9

106 // Some bad format/argTypes

107 fmt.Printf("%b", "hi") // ERROR "Printf format %b has arg \x22hi\x22 of wrong type string"

108 fmt.Printf("%t", c) // ERROR "Printf format %t has arg c of wrong type complex64"

109 fmt.Printf("%t", 1+2i) // ERROR "Printf format %t has arg 1 \+ 2i of wrong type complex128"

110 fmt.Printf("%c", 2.3) // ERROR "Printf format %c has arg 2.3 of wrong type float64"

111 fmt.Printf("%d", 2.3) // ERROR "Printf format %d has arg 2.3 of wrong type float64"

112 fmt.Printf("%e", "hi") // ERROR "Printf format %e has arg \x22hi\x22 of wrong type string"

113 fmt.Printf("%E", true) // ERROR "Printf format %E has arg true of wrong type bool"

114 fmt.Printf("%f", "hi") // ERROR "Printf format %f has arg \x22hi\x22 of wrong type string"

115 fmt.Printf("%F", 'x') // ERROR "Printf format %F has arg 'x' of wrong type rune"

116 fmt.Printf("%g", "hi") // ERROR "Printf format %g has arg \x22hi\x22 of wrong type string"

117 fmt.Printf("%g", imap) // ERROR "Printf format %g has arg imap of wrong type map\[int\]int"

118 fmt.Printf("%G", i) // ERROR "Printf format %G has arg i of wrong type int"

119 fmt.Printf("%o", x) // ERROR "Printf format %o has arg x of wrong type float64"

120 fmt.Printf("%p", nil) // ERROR "Printf format %p has arg nil of wrong type untyped nil"

121 fmt.Printf("%p", 23) // ERROR "Printf format %p has arg 23 of wrong type int"

122 fmt.Printf("%q", x) // ERROR "Printf format %q has arg x of wrong type float64"

123 fmt.Printf("%s", b) // ERROR "Printf format %s has arg b of wrong type bool"

124 fmt.Printf("%s", byte(65)) // ERROR "Printf format %s has arg byte$65$ of wrong type byte"

125 fmt.Printf("%t", 23) // ERROR "Printf format %t has arg 23 of wrong type int"

126 fmt.Printf("%U", x) // ERROR "Printf format %U has arg x of wrong type float64"

127 fmt.Printf("%x", nil) // ERROR "Printf format %x has arg nil of wrong type untyped nil"

128 fmt.Printf("%s", stringerv) // ERROR "Printf format %s has arg stringerv of wrong type .*print.ptrStringer"

129 fmt.Printf("%t", stringerv) // ERROR "Printf format %t has arg stringerv of wrong type .*print.ptrStringer"

130 fmt.Printf("%s", embeddedStringerv) // ERROR "Printf format %s has arg embeddedStringerv of wrong type .*print.embeddedStringer"

131 fmt.Printf("%t", embeddedStringerv) // ERROR "Printf format %t has arg embeddedStringerv of wrong type .*print.embeddedStringer"

132 fmt.Printf("%q", notstringerv) // ERROR "Printf format %q has arg notstringerv of wrong type .*print.notstringer"

133 fmt.Printf("%t", notstringerv) // ERROR "Printf format %t has arg notstringerv of wrong type .*print.notstringer"

134 fmt.Printf("%t", stringerarrayv) // ERROR "Printf format %t has arg stringerarrayv of wrong type .*print.stringerarray"

135 fmt.Printf("%t", notstringerarrayv) // ERROR "Printf format %t has arg notstringerarrayv of wrong type .*print.notstringerarray"

136 fmt.Printf("%q", notstringerarrayv) // ERROR "Printf format %q has arg notstringerarrayv of wrong type .*print.notstringerarray"

137 fmt.Printf("%d", BoolFormatter(true)) // ERROR "Printf format %d has arg BoolFormatter$true$ of wrong type .*print.BoolFormatter"

138 fmt.Printf("%z", FormatterVal(true)) // correct (the type is responsible for formatting)

139 fmt.Printf("%d", FormatterVal(true)) // correct (the type is responsible for formatting)

140 fmt.Printf("%s", nonemptyinterface) // correct (the type is responsible for formatting)

141 fmt.Printf("%.*s %d %6g", 3, "hi", 23, 'x') // ERROR "Printf format %6g has arg 'x' of wrong type rune"

142 fmt.Println() // not an error

143 fmt.Println("%s", "hi") // ERROR "Println call has possible Printf formatting directive %s"

144 fmt.Println("%v", "hi") // ERROR "Println call has possible Printf formatting directive %v"

145 fmt.Println("%T", "hi") // ERROR "Println call has possible Printf formatting directive %T"

146 fmt.Println("0.0%") // correct (trailing % couldn't be a formatting directive)

147 fmt.Printf("%s", "hi", 3) // ERROR "Printf call needs 1 arg but has 2 args"

148 _ = fmt.Sprintf("%"+("s"), "hi", 3) // ERROR "Sprintf call needs 1 arg but has 2 args"

149 fmt.Printf("%s%%%d", "hi", 3) // correct

150 fmt.Printf("%08s", "woo") // correct

151 fmt.Printf("% 8s", "woo") // correct

152 fmt.Printf("%.*d", 3, 3) // correct

153 fmt.Printf("%.*d x", 3, 3, 3, 3) // ERROR "Printf call needs 2 args but has 4 args"

154 fmt.Printf("%.*d x", "hi", 3) // ERROR "Printf format %.*d uses non-int \x22hi\x22 as argument of \*"

155 fmt.Printf("%.*d x", i, 3) // correct

156 fmt.Printf("%.*d x", s, 3) // ERROR "Printf format %.\*d uses non-int s as argument of \*"

157 fmt.Printf("%*% x", 0.22) // ERROR "Printf format %\*% uses non-int 0.22 as argument of \*"

158 fmt.Printf("%q %q", multi()...) // ok

159 fmt.Printf("%#q", `blah`) // ok

160 // printf("now is the time", "buddy") // no error "printf call has arguments but no formatting directives"

161 Printf("now is the time", "buddy") // ERROR "Printf call has arguments but no formatting directives"

162 Printf("hi") // ok

163 const format = "%s %s\n"

164 Printf(format, "hi", "there")

165 Printf(format, "hi") // ERROR "Printf format %s reads arg #2, but call has 1 arg$"

166 Printf("%s %d %.3v %q", "str", 4) // ERROR "Printf format %.3v reads arg #3, but call has 2 args"

167 f := new(ptrStringer)

168 f.Warn(0, "%s", "hello", 3) // ERROR "Warn call has possible Printf formatting directive %s"

169 f.Warnf(0, "%s", "hello", 3) // ERROR "Warnf call needs 1 arg but has 2 args"

170 f.Warnf(0, "%r", "hello") // ERROR "Warnf format %r has unknown verb r"

171 f.Warnf(0, "%#s", "hello") // ERROR "Warnf format %#s has unrecognized flag #"

172 f.Warn2(0, "%s", "hello", 3) // ERROR "Warn2 call has possible Printf formatting directive %s"

173 f.Warnf2(0, "%s", "hello", 3) // ERROR "Warnf2 call needs 1 arg but has 2 args"

174 f.Warnf2(0, "%r", "hello") // ERROR "Warnf2 format %r has unknown verb r"

175 f.Warnf2(0, "%#s", "hello") // ERROR "Warnf2 format %#s has unrecognized flag #"

176 f.Wrap(0, "%s", "hello", 3) // ERROR "Wrap call has possible Printf formatting directive %s"

177 f.Wrapf(0, "%s", "hello", 3) // ERROR "Wrapf call needs 1 arg but has 2 args"

178 f.Wrapf(0, "%r", "hello") // ERROR "Wrapf format %r has unknown verb r"

179 f.Wrapf(0, "%#s", "hello") // ERROR "Wrapf format %#s has unrecognized flag #"

180 f.Wrap2(0, "%s", "hello", 3) // ERROR "Wrap2 call has possible Printf formatting directive %s"

181 f.Wrapf2(0, "%s", "hello", 3) // ERROR "Wrapf2 call needs 1 arg but has 2 args"

182 f.Wrapf2(0, "%r", "hello") // ERROR "Wrapf2 format %r has unknown verb r"

183 f.Wrapf2(0, "%#s", "hello") // ERROR "Wrapf2 format %#s has unrecognized flag #"

184 fmt.Printf("%#s", FormatterVal(true)) // correct (the type is responsible for formatting)

185 Printf("d%", 2) // ERROR "Printf format % is missing verb at end of string"

186 Printf("%d", percentDV)

187 Printf("%d", &percentDV)

188 Printf("%d", notPercentDV) // ERROR "Printf format %d has arg notPercentDV of wrong type .*print.notPercentDStruct"

189 Printf("%d", &notPercentDV) // ERROR "Printf format %d has arg &notPercentDV of wrong type \*.*print.notPercentDStruct"

190 Printf("%p", &notPercentDV) // Works regardless: we print it as a pointer.

191 Printf("%q", &percentDV) // ERROR "Printf format %q has arg &percentDV of wrong type \*.*print.percentDStruct"

192 Printf("%s", percentSV)

193 Printf("%s", &percentSV)

194 // Good argument reorderings.

195 Printf("%[1]d", 3)

196 Printf("%[1]*d", 3, 1)

197 Printf("%[2]*[1]d", 1, 3)

198 Printf("%[2]*.[1]*[3]d", 2, 3, 4)

199 fmt.Fprintf(os.Stderr, "%[2]*.[1]*[3]d", 2, 3, 4) // Use Fprintf to make sure we count arguments correctly.

200 // Bad argument reorderings.

201 Printf("%[xd", 3) // ERROR "Printf format %\[xd is missing closing \]"

202 Printf("%[x]d x", 3) // ERROR "Printf format has invalid argument index \[x\]"

203 Printf("%[3]*s x", "hi", 2) // ERROR "Printf format has invalid argument index \[3\]"

204 _ = fmt.Sprintf("%[3]d x", 2) // ERROR "Sprintf format has invalid argument index \[3\]"

205 Printf("%[2]*.[1]*[3]d x", 2, "hi", 4) // ERROR "Printf format %\[2]\*\.\[1\]\*\[3\]d uses non-int \x22hi\x22 as argument of \*"

206 Printf("%[0]s x", "arg1") // ERROR "Printf format has invalid argument index \[0\]"

207 Printf("%[0]d x", 1) // ERROR "Printf format has invalid argument index \[0\]"

208 // Something that satisfies the error interface.

209 var e error

210 fmt.Println(e.Error()) // ok

211 // Something that looks like an error interface but isn't, such as the (*T).Error method

212 // in the testing package.

213 var et1 *testing.T

214 et1.Error() // ok

215 et1.Error("hi") // ok

216 et1.Error("%d", 3) // ERROR "Error call has possible Printf formatting directive %d"

217 var et3 errorTest3

218 et3.Error() // ok, not an error method.

219 var et4 errorTest4

220 et4.Error() // ok, not an error method.

221 var et5 errorTest5

222 et5.error() // ok, not an error method.

223 // Interfaces can be used with any verb.

224 var iface interface {

225 ToTheMadness() bool // Method ToTheMadness usually returns false

226 }

227 fmt.Printf("%f", iface) // ok: fmt treats interfaces as transparent and iface may well have a float concrete type

228 // Can't print a function.

229 Printf("%d", someFunction) // ERROR "Printf format %d arg someFunction is a func value, not called"

230 Printf("%v", someFunction) // ERROR "Printf format %v arg someFunction is a func value, not called"

231 Println(someFunction) // ERROR "Println arg someFunction is a func value, not called"

232 Printf("%p", someFunction) // ok: maybe someone wants to see the pointer

233 Printf("%T", someFunction) // ok: maybe someone wants to see the type

234 // Bug: used to recur forever.

235 Printf("%p %x", recursiveStructV, recursiveStructV.next)

236 Printf("%p %x", recursiveStruct1V, recursiveStruct1V.next) // ERROR "Printf format %x has arg recursiveStruct1V\.next of wrong type \*.*print\.RecursiveStruct2"

237 Printf("%p %x", recursiveSliceV, recursiveSliceV)

238 Printf("%p %x", recursiveMapV, recursiveMapV)

239 // Special handling for Log.

240 math.Log(3) // OK

241 var t *testing.T

242 t.Log("%d", 3) // ERROR "Log call has possible Printf formatting directive %d"

243 t.Logf("%d", 3)

244 t.Logf("%d", "hi") // ERROR "Logf format %d has arg \x22hi\x22 of wrong type string"

245

246 Errorf(1, "%d", 3) // OK

247 Errorf(1, "%d", "hi") // ERROR "Errorf format %d has arg \x22hi\x22 of wrong type string"

248

249 // Multiple string arguments before variadic args

250 errorf("WARNING", "foobar") // OK

251 errorf("INFO", "s=%s, n=%d", "foo", 1) // OK

252 errorf("ERROR", "%d") // ERROR "errorf format %d reads arg #1, but call has 0 args"

253

254 // Printf from external package

255 // externalprintf.Printf("%d", 42) // OK

256 // externalprintf.Printf("foobar") // OK

257 // level := 123

258 // externalprintf.Logf(level, "%d", 42) // OK

259 // externalprintf.Errorf(level, level, "foo %q bar", "foobar") // OK

260 // externalprintf.Logf(level, "%d") // no error "Logf format %d reads arg #1, but call has 0 args"

261 // var formatStr = "%s %s"

262 // externalprintf.Sprintf(formatStr, "a", "b") // OK

263 // externalprintf.Logf(level, formatStr, "a", "b") // OK

264

265 // user-defined Println-like functions

266 ss := &someStruct{}

267 ss.Log(someFunction, "foo") // OK

268 ss.Error(someFunction, someFunction) // OK

269 ss.Println() // OK

270 ss.Println(1.234, "foo") // OK

271 ss.Println(1, someFunction) // no error "Println arg someFunction is a func value, not called"

272 ss.log(someFunction) // OK

273 ss.log(someFunction, "bar", 1.33) // OK

274 ss.log(someFunction, someFunction) // no error "log arg someFunction is a func value, not called"

275

276 // indexed arguments

277 Printf("%d %[3]d %d %[2]d x", 1, 2, 3, 4) // OK

278 Printf("%d %[0]d %d %[2]d x", 1, 2, 3, 4) // ERROR "Printf format has invalid argument index \[0\]"

279 Printf("%d %[3]d %d %[-2]d x", 1, 2, 3, 4) // ERROR "Printf format has invalid argument index \[-2\]"

280 Printf("%d %[3]d %d %[2234234234234]d x", 1, 2, 3, 4) // ERROR "Printf format has invalid argument index \[2234234234234\]"

281 Printf("%d %[3]d %-10d %[2]d x", 1, 2, 3) // ERROR "Printf format %-10d reads arg #4, but call has 3 args"

282 Printf("%[1][3]d x", 1, 2) // ERROR "Printf format %\[1\]\[ has unknown verb \["

283 Printf("%[1]d x", 1, 2) // OK

284 Printf("%d %[3]d %d %[2]d x", 1, 2, 3, 4, 5) // OK

285

286 // wrote Println but meant Fprintln

287 Printf("%p\n", os.Stdout) // OK

288 Println(os.Stdout, "hello") // ERROR "Println does not take io.Writer but has first arg os.Stdout"

289

290 Printf(someString(), "hello") // OK

291

292 // Printf wrappers in package log should be detected automatically

293 logpkg.Fatal("%d", 1) // ERROR "Fatal call has possible Printf formatting directive %d"

294 logpkg.Fatalf("%d", "x") // ERROR "Fatalf format %d has arg \x22x\x22 of wrong type string"

295 logpkg.Fatalln("%d", 1) // ERROR "Fatalln call has possible Printf formatting directive %d"

296 logpkg.Panic("%d", 1) // ERROR "Panic call has possible Printf formatting directive %d"

297 logpkg.Panicf("%d", "x") // ERROR "Panicf format %d has arg \x22x\x22 of wrong type string"

298 logpkg.Panicln("%d", 1) // ERROR "Panicln call has possible Printf formatting directive %d"

299 logpkg.Print("%d", 1) // ERROR "Print call has possible Printf formatting directive %d"

300 logpkg.Printf("%d", "x") // ERROR "Printf format %d has arg \x22x\x22 of wrong type string"

301 logpkg.Println("%d", 1) // ERROR "Println call has possible Printf formatting directive %d"

302

303 // Methods too.

304 var l *logpkg.Logger

305 l.Fatal("%d", 1) // ERROR "Fatal call has possible Printf formatting directive %d"

306 l.Fatalf("%d", "x") // ERROR "Fatalf format %d has arg \x22x\x22 of wrong type string"

307 l.Fatalln("%d", 1) // ERROR "Fatalln call has possible Printf formatting directive %d"

308 l.Panic("%d", 1) // ERROR "Panic call has possible Printf formatting directive %d"

309 l.Panicf("%d", "x") // ERROR "Panicf format %d has arg \x22x\x22 of wrong type string"

310 l.Panicln("%d", 1) // ERROR "Panicln call has possible Printf formatting directive %d"

311 l.Print("%d", 1) // ERROR "Print call has possible Printf formatting directive %d"

312 l.Printf("%d", "x") // ERROR "Printf format %d has arg \x22x\x22 of wrong type string"

313 l.Println("%d", 1) // ERROR "Println call has possible Printf formatting directive %d"

314

315 // Issue 26486

316 dbg("", 1) // no error "call has arguments but no formatting directive"

317 }

318

319 func someString() string { return "X" }

320

321 type someStruct struct{}

322

323 // Log is non-variadic user-define Println-like function.

324 // Calls to this func must be skipped when checking

325 // for Println-like arguments.

326 func (ss *someStruct) Log(f func(), s string) {}

327

328 // Error is variadic user-define Println-like function.

329 // Calls to this func mustn't be checked for Println-like arguments,

330 // since variadic arguments type isn't interface{}.

331 func (ss *someStruct) Error(args ...func()) {}

332

333 // Println is variadic user-defined Println-like function.

334 // Calls to this func must be checked for Println-like arguments.

335 func (ss *someStruct) Println(args ...interface{}) {}

336

337 // log is variadic user-defined Println-like function.

338 // Calls to this func must be checked for Println-like arguments.

339 func (ss *someStruct) log(f func(), args ...interface{}) {}

340

341 // A function we use as a function value; it has no other purpose.

342 func someFunction() {}

343

344 // Printf is used by the test so we must declare it.

345 func Printf(format string, args ...interface{}) {

346 fmt.Printf(format, args...)

347 }

348

349 // Println is used by the test so we must declare it.

350 func Println(args ...interface{}) {

351 fmt.Println(args...)

352 }

353

354 // printf is used by the test so we must declare it.

355 func printf(format string, args ...interface{}) {

356 fmt.Printf(format, args...)

357 }

358

359 // Errorf is used by the test for a case in which the first parameter

360 // is not a format string.

361 func Errorf(i int, format string, args ...interface{}) {

362 _ = fmt.Errorf(format, args...)

363 }

364

365 // errorf is used by the test for a case in which the function accepts multiple

366 // string parameters before variadic arguments

367 func errorf(level, format string, args ...interface{}) {

368 _ = fmt.Errorf(format, args...)

369 }

370

371 // multi is used by the test.

372 func multi() []interface{} {

373 panic("don't call - testing only")

374 }

375

376 type stringer int

377

378 func (stringer) String() string { return "string" }

379

380 type ptrStringer float64

381

382 var stringerv ptrStringer

383

384 func (*ptrStringer) String() string {

385 return "string"

386 }

387

388 func (p *ptrStringer) Warn2(x int, args ...interface{}) string {

389 return p.Warn(x, args...)

390 }

391

392 func (p *ptrStringer) Warnf2(x int, format string, args ...interface{}) string {

393 return p.Warnf(x, format, args...)

394 }

395

396 func (*ptrStringer) Warn(x int, args ...interface{}) string {

397 return "warn"

398 }

399

400 func (*ptrStringer) Warnf(x int, format string, args ...interface{}) string {

401 return "warnf"

402 }

403

404 func (p *ptrStringer) Wrap2(x int, args ...interface{}) string {

405 return p.Wrap(x, args...)

406 }

407

408 func (p *ptrStringer) Wrapf2(x int, format string, args ...interface{}) string {

409 return p.Wrapf(x, format, args...)

410 }

411

412 func (*ptrStringer) Wrap(x int, args ...interface{}) string {

413 return fmt.Sprint(args...)

414 }

415

416 func (*ptrStringer) Wrapf(x int, format string, args ...interface{}) string {

417 return fmt.Sprintf(format, args...)

418 }

419

420 func (*ptrStringer) BadWrap(x int, args ...interface{}) string {

421 return fmt.Sprint(args) // ERROR "missing ... in args forwarded to print-like function"

422 }

423

424 func (*ptrStringer) BadWrapf(x int, format string, args ...interface{}) string {

425 return fmt.Sprintf(format, args) // ERROR "missing ... in args forwarded to printf-like function"

426 }

427

428 func (*ptrStringer) WrapfFalsePositive(x int, arg1 string, arg2 ...interface{}) string {

429 return fmt.Sprintf("%s %v", arg1, arg2)

430 }

431

432 type embeddedStringer struct {

433 foo string

434 ptrStringer

435 bar int

436 }

437

438 var embeddedStringerv embeddedStringer

439

440 type notstringer struct {

441 f float64

442 }

443

444 var notstringerv notstringer

445

446 type stringerarray [4]float64

447

448 func (stringerarray) String() string {

449 return "string"

450 }

451

452 var stringerarrayv stringerarray

453

454 type notstringerarray [4]float64

455

456 var notstringerarrayv notstringerarray

457

458 var nonemptyinterface = interface {

459 f()

460 }(nil)

461

462 // A data type we can print with "%d".

463 type percentDStruct struct {

464 a int

465 b []byte

466 c *float64

467 }

468

469 var percentDV percentDStruct

470

471 // A data type we cannot print correctly with "%d".

472 type notPercentDStruct struct {

473 a int

474 b []byte

475 c bool

476 }

477

478 var notPercentDV notPercentDStruct

479

480 // A data type we can print with "%s".

481 type percentSStruct struct {

482 a string

483 b []byte

484 C stringerarray

485 }

486

487 var percentSV percentSStruct

488

489 type recursiveStringer int

490

491 func (s recursiveStringer) String() string {

492 _ = fmt.Sprintf("%d", s)

493 _ = fmt.Sprintf("%#v", s)

494 _ = fmt.Sprintf("%v", s) // ERROR "Sprintf format %v with arg s causes recursive .*String method call"

495 _ = fmt.Sprintf("%v", &s) // ERROR "Sprintf format %v with arg &s causes recursive .*String method call"

496 _ = fmt.Sprintf("%T", s) // ok; does not recursively call String

497 return fmt.Sprintln(s) // ERROR "Sprintln arg s causes recursive call to .*String method"

498 }

499

500 type recursivePtrStringer int

501

502 func (p *recursivePtrStringer) String() string {

503 _ = fmt.Sprintf("%v", *p)

504 _ = fmt.Sprint(&p) // ok; prints address

505 return fmt.Sprintln(p) // ERROR "Sprintln arg p causes recursive call to .*String method"

506 }

507

508 type BoolFormatter bool

509

510 func (*BoolFormatter) Format(fmt.State, rune) {

511 }

512

513 // Formatter with value receiver

514 type FormatterVal bool

515

516 func (FormatterVal) Format(fmt.State, rune) {

517 }

518

519 type RecursiveSlice []RecursiveSlice

520

521 var recursiveSliceV = &RecursiveSlice{}

522

523 type RecursiveMap map[int]RecursiveMap

524

525 var recursiveMapV = make(RecursiveMap)

526

527 type RecursiveStruct struct {

528 next *RecursiveStruct

529 }

530

531 var recursiveStructV = &RecursiveStruct{}

532

533 type RecursiveStruct1 struct {

534 next *RecursiveStruct2

535 }

536

537 type RecursiveStruct2 struct {

538 next *RecursiveStruct1

539 }

540

541 var recursiveStruct1V = &RecursiveStruct1{}

542

543 type unexportedInterface struct {

544 f interface{}

545 }

546

547 // Issue 17798: unexported ptrStringer cannot be formatted.

548 type unexportedStringer struct {

549 t ptrStringer

550 }

551 type unexportedStringerOtherFields struct {

552 s string

553 t ptrStringer

554 S string

555 }

556

557 // Issue 17798: unexported error cannot be formatted.

558 type unexportedError struct {

559 e error

560 }

561 type unexportedErrorOtherFields struct {

562 s string

563 e error

564 S string

565 }

566

567 type errorer struct{}

568

569 func (e errorer) Error() string { return "errorer" }

570

571 type unexportedCustomError struct {

572 e errorer

573 }

574

575 type errorInterface interface {

576 error

577 ExtraMethod()

578 }

579

580 type unexportedErrorInterface struct {

581 e errorInterface

582 }

583

584 func UnexportedStringerOrError() {

585 fmt.Printf("%s", unexportedInterface{"foo"}) // ok; prints {foo}

586 fmt.Printf("%s", unexportedInterface{3}) // ok; we can't see the problem

587

588 us := unexportedStringer{}

589 fmt.Printf("%s", us) // ERROR "Printf format %s has arg us of wrong type .*print.unexportedStringer"

590 fmt.Printf("%s", &us) // ERROR "Printf format %s has arg &us of wrong type [*].*print.unexportedStringer"

591

592 usf := unexportedStringerOtherFields{

593 s: "foo",

594 S: "bar",

595 }

596 fmt.Printf("%s", usf) // ERROR "Printf format %s has arg usf of wrong type .*print.unexportedStringerOtherFields"

597 fmt.Printf("%s", &usf) // ERROR "Printf format %s has arg &usf of wrong type [*].*print.unexportedStringerOtherFields"

598

599 ue := unexportedError{

600 e: &errorer{},

601 }

602 fmt.Printf("%s", ue) // ERROR "Printf format %s has arg ue of wrong type .*print.unexportedError"

603 fmt.Printf("%s", &ue) // ERROR "Printf format %s has arg &ue of wrong type [*].*print.unexportedError"

604

605 uef := unexportedErrorOtherFields{

606 s: "foo",

607 e: &errorer{},

608 S: "bar",

609 }

610 fmt.Printf("%s", uef) // ERROR "Printf format %s has arg uef of wrong type .*print.unexportedErrorOtherFields"

611 fmt.Printf("%s", &uef) // ERROR "Printf format %s has arg &uef of wrong type [*].*print.unexportedErrorOtherFields"

612

613 uce := unexportedCustomError{

614 e: errorer{},

615 }

616 fmt.Printf("%s", uce) // ERROR "Printf format %s has arg uce of wrong type .*print.unexportedCustomError"

617

618 uei := unexportedErrorInterface{}

619 fmt.Printf("%s", uei) // ERROR "Printf format %s has arg uei of wrong type .*print.unexportedErrorInterface"

620 fmt.Println("foo\n", "bar") // not an error

621

622 fmt.Println("foo\n") // ERROR "Println arg list ends with redundant newline"

623 fmt.Println("foo\\n") // not an error

624 fmt.Println(`foo\n`) // not an error

625

626 intSlice := []int{3, 4}

627 fmt.Printf("%s", intSlice) // ERROR "Printf format %s has arg intSlice of wrong type \[\]int"

628 nonStringerArray := [1]unexportedStringer{{}}

629 fmt.Printf("%s", nonStringerArray) // ERROR "Printf format %s has arg nonStringerArray of wrong type \[1\].*print.unexportedStringer"

630 fmt.Printf("%s", []stringer{3, 4}) // not an error

631 fmt.Printf("%s", [2]stringer{3, 4}) // not an error

632 }

633

634 // TODO: Disable complaint about '0' for Go 1.10. To be fixed properly in 1.11.

635 // See issues 23598 and 23605.

636 func DisableErrorForFlag0() {

637 fmt.Printf("%0t", true)

638 }

639

640 // Issue 26486.

641 func dbg(format string, args ...interface{}) {

642 if format == "" {

643 format = "%v"

644 }

645 fmt.Printf(format, args...)

646 }

647

648 func PointersToCompoundTypes() {

649 stringSlice := []string{"a", "b"}

650 fmt.Printf("%s", &stringSlice) // not an error

651

652 intSlice := []int{3, 4}

653 fmt.Printf("%s", &intSlice) // ERROR "Printf format %s has arg &intSlice of wrong type \*\[\]int"

654

655 stringArray := [2]string{"a", "b"}

656 fmt.Printf("%s", &stringArray) // not an error

657

658 intArray := [2]int{3, 4}

659 fmt.Printf("%s", &intArray) // ERROR "Printf format %s has arg &intArray of wrong type \*\[2\]int"

660

661 stringStruct := struct{ F string }{"foo"}

662 fmt.Printf("%s", &stringStruct) // not an error

663

664 intStruct := struct{ F int }{3}

665 fmt.Printf("%s", &intStruct) // ERROR "Printf format %s has arg &intStruct of wrong type \*struct{F int}"

666

667 stringMap := map[string]string{"foo": "bar"}

668 fmt.Printf("%s", &stringMap) // not an error

669

670 intMap := map[int]int{3: 4}

671 fmt.Printf("%s", &intMap) // ERROR "Printf format %s has arg &intMap of wrong type \*map\[int\]int"

672

673 type T2 struct {

674 X string

675 }

676 type T1 struct {

677 X *T2

678 }

679 fmt.Printf("%s\n", T1{&T2{"x"}}) // ERROR "Printf format %s has arg T1{&T2{.x.}} of wrong type .*print\.T1"

680 }