github.com/euank/go@v0.0.0-20160829210321-495514729181/src/cmd/vet/testdata/print.go (about) 1 // Copyright 2010 The Go Authors. All rights reserved. 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 testdata 8 9 import ( 10 "fmt" 11 "io" 12 "math" 13 "os" 14 "unsafe" // just for test case printing unsafe.Pointer 15 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", p, nil) 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", 3, i, "hi", s) 85 fmt.Printf("%X %X %X %X", 3, i, "hi", s) 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("%v", notstringerv) 91 fmt.Printf("%T", notstringerv) 92 fmt.Printf("%q", stringerarrayv) 93 fmt.Printf("%v", stringerarrayv) 94 fmt.Printf("%s", stringerarrayv) 95 fmt.Printf("%v", notstringerarrayv) 96 fmt.Printf("%T", notstringerarrayv) 97 fmt.Printf("%d", new(Formatter)) 98 fmt.Printf("%*%", 2) // Ridiculous but allowed. 99 fmt.Printf("%s", interface{}(nil)) // Nothing useful we can say. 100 101 fmt.Printf("%g", 1+2i) 102 // Some bad format/argTypes 103 fmt.Printf("%b", "hi") // ERROR "arg .hi. for printf verb %b of wrong type" 104 fmt.Printf("%t", c) // ERROR "arg c for printf verb %t of wrong type" 105 fmt.Printf("%t", 1+2i) // ERROR "arg 1 \+ 2i for printf verb %t of wrong type" 106 fmt.Printf("%c", 2.3) // ERROR "arg 2.3 for printf verb %c of wrong type" 107 fmt.Printf("%d", 2.3) // ERROR "arg 2.3 for printf verb %d of wrong type" 108 fmt.Printf("%e", "hi") // ERROR "arg .hi. for printf verb %e of wrong type" 109 fmt.Printf("%E", true) // ERROR "arg true for printf verb %E of wrong type" 110 fmt.Printf("%f", "hi") // ERROR "arg .hi. for printf verb %f of wrong type" 111 fmt.Printf("%F", 'x') // ERROR "arg 'x' for printf verb %F of wrong type" 112 fmt.Printf("%g", "hi") // ERROR "arg .hi. for printf verb %g of wrong type" 113 fmt.Printf("%g", imap) // ERROR "arg imap for printf verb %g of wrong type" 114 fmt.Printf("%G", i) // ERROR "arg i for printf verb %G of wrong type" 115 fmt.Printf("%o", x) // ERROR "arg x for printf verb %o of wrong type" 116 fmt.Printf("%p", 23) // ERROR "arg 23 for printf verb %p of wrong type" 117 fmt.Printf("%q", x) // ERROR "arg x for printf verb %q of wrong type" 118 fmt.Printf("%s", b) // ERROR "arg b for printf verb %s of wrong type" 119 fmt.Printf("%s", byte(65)) // ERROR "arg byte\(65\) for printf verb %s of wrong type" 120 fmt.Printf("%t", 23) // ERROR "arg 23 for printf verb %t of wrong type" 121 fmt.Printf("%U", x) // ERROR "arg x for printf verb %U of wrong type" 122 fmt.Printf("%x", nil) // ERROR "arg nil for printf verb %x of wrong type" 123 fmt.Printf("%X", 2.3) // ERROR "arg 2.3 for printf verb %X of wrong type" 124 fmt.Printf("%s", stringerv) // ERROR "arg stringerv for printf verb %s of wrong type" 125 fmt.Printf("%t", stringerv) // ERROR "arg stringerv for printf verb %t of wrong type" 126 fmt.Printf("%q", notstringerv) // ERROR "arg notstringerv for printf verb %q of wrong type" 127 fmt.Printf("%t", notstringerv) // ERROR "arg notstringerv for printf verb %t of wrong type" 128 fmt.Printf("%t", stringerarrayv) // ERROR "arg stringerarrayv for printf verb %t of wrong type" 129 fmt.Printf("%t", notstringerarrayv) // ERROR "arg notstringerarrayv for printf verb %t of wrong type" 130 fmt.Printf("%q", notstringerarrayv) // ERROR "arg notstringerarrayv for printf verb %q of wrong type" 131 fmt.Printf("%d", Formatter(true)) // correct (the type is responsible for formatting) 132 fmt.Printf("%s", nonemptyinterface) // correct (the dynamic type of nonemptyinterface may be a stringer) 133 fmt.Printf("%.*s %d %g", 3, "hi", 23, 'x') // ERROR "arg 'x' for printf verb %g of wrong type" 134 fmt.Println() // not an error 135 fmt.Println("%s", "hi") // ERROR "possible formatting directive in Println call" 136 fmt.Println("0.0%") // correct (trailing % couldn't be a formatting directive) 137 fmt.Printf("%s", "hi", 3) // ERROR "wrong number of args for format in Printf call" 138 _ = fmt.Sprintf("%"+("s"), "hi", 3) // ERROR "wrong number of args for format in Sprintf call" 139 fmt.Printf("%s%%%d", "hi", 3) // correct 140 fmt.Printf("%08s", "woo") // correct 141 fmt.Printf("% 8s", "woo") // correct 142 fmt.Printf("%.*d", 3, 3) // correct 143 fmt.Printf("%.*d", 3, 3, 3, 3) // ERROR "wrong number of args for format in Printf call.*4 args" 144 fmt.Printf("%.*d", "hi", 3) // ERROR "arg .hi. for \* in printf format not of type int" 145 fmt.Printf("%.*d", i, 3) // correct 146 fmt.Printf("%.*d", s, 3) // ERROR "arg s for \* in printf format not of type int" 147 fmt.Printf("%*%", 0.22) // ERROR "arg 0.22 for \* in printf format not of type int" 148 fmt.Printf("%q %q", multi()...) // ok 149 fmt.Printf("%#q", `blah`) // ok 150 printf("now is the time", "buddy") // ERROR "no formatting directive" 151 Printf("now is the time", "buddy") // ERROR "no formatting directive" 152 Printf("hi") // ok 153 const format = "%s %s\n" 154 Printf(format, "hi", "there") 155 Printf(format, "hi") // ERROR "missing argument for Printf..%s..: format reads arg 2, have only 1" 156 Printf("%s %d %.3v %q", "str", 4) // ERROR "missing argument for Printf..%.3v..: format reads arg 3, have only 2" 157 f := new(stringer) 158 f.Warn(0, "%s", "hello", 3) // ERROR "possible formatting directive in Warn call" 159 f.Warnf(0, "%s", "hello", 3) // ERROR "wrong number of args for format in Warnf call" 160 f.Warnf(0, "%r", "hello") // ERROR "unrecognized printf verb" 161 f.Warnf(0, "%#s", "hello") // ERROR "unrecognized printf flag" 162 Printf("d%", 2) // ERROR "missing verb at end of format string in Printf call" 163 Printf("%d", percentDV) 164 Printf("%d", &percentDV) 165 Printf("%d", notPercentDV) // ERROR "arg notPercentDV for printf verb %d of wrong type" 166 Printf("%d", ¬PercentDV) // ERROR "arg ¬PercentDV for printf verb %d of wrong type" 167 Printf("%p", ¬PercentDV) // Works regardless: we print it as a pointer. 168 Printf("%s", percentSV) 169 Printf("%s", &percentSV) 170 // Good argument reorderings. 171 Printf("%[1]d", 3) 172 Printf("%[1]*d", 3, 1) 173 Printf("%[2]*[1]d", 1, 3) 174 Printf("%[2]*.[1]*[3]d", 2, 3, 4) 175 fmt.Fprintf(os.Stderr, "%[2]*.[1]*[3]d", 2, 3, 4) // Use Fprintf to make sure we count arguments correctly. 176 // Bad argument reorderings. 177 Printf("%[xd", 3) // ERROR "illegal syntax for printf argument index" 178 Printf("%[x]d", 3) // ERROR "illegal syntax for printf argument index" 179 Printf("%[3]*s", "hi", 2) // ERROR "missing argument for Printf.* reads arg 3, have only 2" 180 _ = fmt.Sprintf("%[3]d", 2) // ERROR "missing argument for Sprintf.* reads arg 3, have only 1" 181 Printf("%[2]*.[1]*[3]d", 2, "hi", 4) // ERROR "arg .hi. for \* in printf format not of type int" 182 Printf("%[0]s", "arg1") // ERROR "index value \[0\] for Printf.*; indexes start at 1" 183 Printf("%[0]d", 1) // ERROR "index value \[0\] for Printf.*; indexes start at 1" 184 // Something that satisfies the error interface. 185 var e error 186 fmt.Println(e.Error()) // ok 187 // Something that looks like an error interface but isn't, such as the (*T).Error method 188 // in the testing package. 189 var et1 errorTest1 190 fmt.Println(et1.Error()) // ok 191 fmt.Println(et1.Error("hi")) // ok 192 fmt.Println(et1.Error("%d", 3)) // ERROR "possible formatting directive in Error call" 193 var et2 errorTest2 194 et2.Error() // ok 195 et2.Error("hi") // ok, not an error method. 196 et2.Error("%d", 3) // ERROR "possible formatting directive in Error call" 197 var et3 errorTest3 198 et3.Error() // ok, not an error method. 199 var et4 errorTest4 200 et4.Error() // ok, not an error method. 201 var et5 errorTest5 202 et5.error() // ok, not an error method. 203 // Interfaces can be used with any verb. 204 var iface interface { 205 ToTheMadness() bool // Method ToTheMadness usually returns false 206 } 207 fmt.Printf("%f", iface) // ok: fmt treats interfaces as transparent and iface may well have a float concrete type 208 // Can't print a function. 209 Printf("%d", someFunction) // ERROR "arg someFunction in printf call is a function value, not a function call" 210 Printf("%v", someFunction) // ERROR "arg someFunction in printf call is a function value, not a function call" 211 Println(someFunction) // ERROR "arg someFunction in Println call is a function value, not a function call" 212 Printf("%p", someFunction) // ok: maybe someone wants to see the pointer 213 Printf("%T", someFunction) // ok: maybe someone wants to see the type 214 // Bug: used to recur forever. 215 Printf("%p %x", recursiveStructV, recursiveStructV.next) 216 Printf("%p %x", recursiveStruct1V, recursiveStruct1V.next) 217 Printf("%p %x", recursiveSliceV, recursiveSliceV) 218 Printf("%p %x", recursiveMapV, recursiveMapV) 219 // Special handling for Log. 220 math.Log(3) // OK 221 Log(3) // OK 222 Log("%d", 3) // ERROR "possible formatting directive in Log call" 223 Logf("%d", 3) 224 Logf("%d", "hi") // ERROR "arg .hi. for printf verb %d of wrong type: string" 225 226 Errorf(1, "%d", 3) // OK 227 Errorf(1, "%d", "hi") // ERROR "arg .hi. for printf verb %d of wrong type: string" 228 229 // Multiple string arguments before variadic args 230 errorf("WARNING", "foobar") // OK 231 errorf("INFO", "s=%s, n=%d", "foo", 1) // OK 232 errorf("ERROR", "%d") // ERROR "format reads arg 1, have only 0 args" 233 234 // Printf from external package 235 externalprintf.Printf("%d", 42) // OK 236 externalprintf.Printf("foobar") // OK 237 level := 123 238 externalprintf.Logf(level, "%d", 42) // OK 239 externalprintf.Errorf(level, level, "foo %q bar", "foobar") // OK 240 externalprintf.Logf(level, "%d") // ERROR "format reads arg 1, have only 0 args" 241 242 // user-defined Println-like functions 243 ss := &someStruct{} 244 ss.Log(someFunction, "foo") // OK 245 ss.Error(someFunction, someFunction) // OK 246 ss.Println() // OK 247 ss.Println(1.234, "foo") // OK 248 ss.Println(1, someFunction) // ERROR "arg someFunction in Println call is a function value, not a function call" 249 ss.log(someFunction) // OK 250 ss.log(someFunction, "bar", 1.33) // OK 251 ss.log(someFunction, someFunction) // ERROR "arg someFunction in log call is a function value, not a function call" 252 } 253 254 type someStruct struct{} 255 256 // Log is non-variadic user-define Println-like function. 257 // Calls to this func must be skipped when checking 258 // for Println-like arguments. 259 func (ss *someStruct) Log(f func(), s string) {} 260 261 // Error is variadic user-define Println-like function. 262 // Calls to this func mustn't be checked for Println-like arguments, 263 // since variadic arguments type isn't interface{}. 264 func (ss *someStruct) Error(args ...func()) {} 265 266 // Println is variadic user-defined Println-like function. 267 // Calls to this func must be checked for Println-like arguments. 268 func (ss *someStruct) Println(args ...interface{}) {} 269 270 // log is variadic user-defined Println-like function. 271 // Calls to this func must be checked for Println-like arguments. 272 func (ss *someStruct) log(f func(), args ...interface{}) {} 273 274 // A function we use as a function value; it has no other purpose. 275 func someFunction() {} 276 277 // Printf is used by the test so we must declare it. 278 func Printf(format string, args ...interface{}) { 279 panic("don't call - testing only") 280 } 281 282 // Println is used by the test so we must declare it. 283 func Println(args ...interface{}) { 284 panic("don't call - testing only") 285 } 286 287 // Logf is used by the test so we must declare it. 288 func Logf(format string, args ...interface{}) { 289 panic("don't call - testing only") 290 } 291 292 // Log is used by the test so we must declare it. 293 func Log(args ...interface{}) { 294 panic("don't call - testing only") 295 } 296 297 // printf is used by the test so we must declare it. 298 func printf(format string, args ...interface{}) { 299 panic("don't call - testing only") 300 } 301 302 // Errorf is used by the test for a case in which the first parameter 303 // is not a format string. 304 func Errorf(i int, format string, args ...interface{}) { 305 panic("don't call - testing only") 306 } 307 308 // errorf is used by the test for a case in which the function accepts multiple 309 // string parameters before variadic arguments 310 func errorf(level, format string, args ...interface{}) { 311 panic("don't call - testing only") 312 } 313 314 // multi is used by the test. 315 func multi() []interface{} { 316 panic("don't call - testing only") 317 } 318 319 type stringer float64 320 321 var stringerv stringer 322 323 func (*stringer) String() string { 324 return "string" 325 } 326 327 func (*stringer) Warn(int, ...interface{}) string { 328 return "warn" 329 } 330 331 func (*stringer) Warnf(int, string, ...interface{}) string { 332 return "warnf" 333 } 334 335 type notstringer struct { 336 f float64 337 } 338 339 var notstringerv notstringer 340 341 type stringerarray [4]float64 342 343 func (stringerarray) String() string { 344 return "string" 345 } 346 347 var stringerarrayv stringerarray 348 349 type notstringerarray [4]float64 350 351 var notstringerarrayv notstringerarray 352 353 var nonemptyinterface = interface { 354 f() 355 }(nil) 356 357 // A data type we can print with "%d". 358 type percentDStruct struct { 359 a int 360 b []byte 361 c *float64 362 } 363 364 var percentDV percentDStruct 365 366 // A data type we cannot print correctly with "%d". 367 type notPercentDStruct struct { 368 a int 369 b []byte 370 c bool 371 } 372 373 var notPercentDV notPercentDStruct 374 375 // A data type we can print with "%s". 376 type percentSStruct struct { 377 a string 378 b []byte 379 c stringerarray 380 } 381 382 var percentSV percentSStruct 383 384 type recursiveStringer int 385 386 func (s recursiveStringer) String() string { 387 _ = fmt.Sprintf("%d", s) 388 _ = fmt.Sprintf("%#v", s) 389 _ = fmt.Sprintf("%v", s) // ERROR "arg s for printf causes recursive call to String method" 390 _ = fmt.Sprintf("%v", &s) // ERROR "arg &s for printf causes recursive call to String method" 391 _ = fmt.Sprintf("%T", s) // ok; does not recursively call String 392 return fmt.Sprintln(s) // ERROR "arg s in Sprintln call causes recursive call to String method" 393 } 394 395 type recursivePtrStringer int 396 397 func (p *recursivePtrStringer) String() string { 398 _ = fmt.Sprintf("%v", *p) 399 return fmt.Sprintln(p) // ERROR "arg p in Sprintln call causes recursive call to String method" 400 } 401 402 type Formatter bool 403 404 func (*Formatter) Format(fmt.State, rune) { 405 } 406 407 type RecursiveSlice []RecursiveSlice 408 409 var recursiveSliceV = &RecursiveSlice{} 410 411 type RecursiveMap map[int]RecursiveMap 412 413 var recursiveMapV = make(RecursiveMap) 414 415 type RecursiveStruct struct { 416 next *RecursiveStruct 417 } 418 419 var recursiveStructV = &RecursiveStruct{} 420 421 type RecursiveStruct1 struct { 422 next *Recursive2Struct 423 } 424 425 type RecursiveStruct2 struct { 426 next *Recursive1Struct 427 } 428 429 var recursiveStruct1V = &RecursiveStruct1{} 430 431 // Fix for issue 7149: Missing return type on String method caused fault. 432 func (int) String() { 433 return "" 434 } 435 436 func (s *unknownStruct) Fprintln(w io.Writer, s string) {} 437 438 func UnknownStructFprintln() { 439 s := unknownStruct{} 440 s.Fprintln(os.Stdout, "hello, world!") // OK 441 }