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How to use strictFailf method of prog Package

Best Syzkaller code snippet using prog.strictFailf

encoding.go

Source:encoding.go

...279			}280			c.Comment = strings.TrimSpace(p.s[p.i+1:])281		}282		for i := len(c.Args); i < len(meta.Args); i++ {283			p.strictFailf("missing syscall args")284			c.Args = append(c.Args, meta.Args[i].DefaultArg(DirIn))285		}286		if len(c.Args) != len(meta.Args) {287			return nil, fmt.Errorf("wrong call arg count: %v, want %v", len(c.Args), len(meta.Args))288		}289		if r != "" && c.Ret != nil {290			p.vars[r] = c.Ret291		}292		p.comment = ""293	}294	if p.comment != "" {295		prog.Comments = append(prog.Comments, p.comment)296	}297	return prog, nil298}299func (p *parser) parseArg(typ Type, dir Dir) (Arg, error) {300	r := ""301	if p.Char() == '<' {302		p.Parse('<')303		r = p.Ident()304		p.Parse('=')305		p.Parse('>')306	}307	arg, err := p.parseArgImpl(typ, dir)308	if err != nil {309		return nil, err310	}311	if arg == nil {312		if typ != nil {313			arg = typ.DefaultArg(dir)314		} else if r != "" {315			return nil, fmt.Errorf("named nil argument")316		}317	}318	if r != "" {319		if res, ok := arg.(*ResultArg); ok {320			p.vars[r] = res321		}322	}323	return arg, nil324}325func (p *parser) parseArgImpl(typ Type, dir Dir) (Arg, error) {326	if typ == nil && p.Char() != 'n' {327		p.eatExcessive(true, "non-nil argument for nil type")328		return nil, nil329	}330	switch p.Char() {331	case '0':332		return p.parseArgInt(typ, dir)333	case 'r':334		return p.parseArgRes(typ, dir)335	case '&':336		return p.parseArgAddr(typ, dir)337	case '"', '\'':338		return p.parseArgString(typ, dir)339	case '{':340		return p.parseArgStruct(typ, dir)341	case '[':342		return p.parseArgArray(typ, dir)343	case '@':344		return p.parseArgUnion(typ, dir)345	case 'n':346		p.Parse('n')347		p.Parse('i')348		p.Parse('l')349		return nil, nil350	case 'A':351		p.Parse('A')352		p.Parse('U')353		p.Parse('T')354		p.Parse('O')355		return p.parseAuto(typ, dir)356	default:357		return nil, fmt.Errorf("failed to parse argument at '%c' (line #%v/%v: %v)",358			p.Char(), p.l, p.i, p.s)359	}360}361func (p *parser) parseArgInt(typ Type, dir Dir) (Arg, error) {362	val := p.Ident()363	v, err := strconv.ParseUint(val, 0, 64)364	if err != nil {365		return nil, fmt.Errorf("wrong arg value '%v': %v", val, err)366	}367	switch typ.(type) {368	case *ConstType, *IntType, *FlagsType, *ProcType, *CsumType:369		arg := Arg(MakeConstArg(typ, dir, v))370		if dir == DirOut && !typ.isDefaultArg(arg) {371			p.strictFailf("out arg %v has non-default value: %v", typ, v)372			arg = typ.DefaultArg(dir)373		}374		return arg, nil375	case *LenType:376		return MakeConstArg(typ, dir, v), nil377	case *ResourceType:378		return MakeResultArg(typ, dir, nil, v), nil379	case *PtrType, *VmaType:380		index := -v % uint64(len(p.target.SpecialPointers))381		return MakeSpecialPointerArg(typ, dir, index), nil382	default:383		p.eatExcessive(true, "wrong int arg %T", typ)384		return typ.DefaultArg(dir), nil385	}386}387func (p *parser) parseAuto(typ Type, dir Dir) (Arg, error) {388	switch typ.(type) {389	case *ConstType, *LenType, *CsumType:390		return p.auto(MakeConstArg(typ, dir, 0)), nil391	default:392		return nil, fmt.Errorf("wrong type %T for AUTO", typ)393	}394}395func (p *parser) parseArgRes(typ Type, dir Dir) (Arg, error) {396	id := p.Ident()397	var div, add uint64398	if p.Char() == '/' {399		p.Parse('/')400		op := p.Ident()401		v, err := strconv.ParseUint(op, 0, 64)402		if err != nil {403			return nil, fmt.Errorf("wrong result div op: '%v'", op)404		}405		div = v406	}407	if p.Char() == '+' {408		p.Parse('+')409		op := p.Ident()410		v, err := strconv.ParseUint(op, 0, 64)411		if err != nil {412			return nil, fmt.Errorf("wrong result add op: '%v'", op)413		}414		add = v415	}416	v := p.vars[id]417	if v == nil {418		p.strictFailf("undeclared variable %v", id)419		return typ.DefaultArg(dir), nil420	}421	arg := MakeResultArg(typ, dir, v, 0)422	arg.OpDiv = div423	arg.OpAdd = add424	return arg, nil425}426func (p *parser) parseArgAddr(typ Type, dir Dir) (Arg, error) {427	var elem Type428	elemDir := DirInOut429	switch t1 := typ.(type) {430	case *PtrType:431		elem, elemDir = t1.Elem, t1.ElemDir432	case *VmaType:433	default:434		p.eatExcessive(true, "wrong addr arg")435		return typ.DefaultArg(dir), nil436	}437	p.Parse('&')438	auto := false439	var addr, vmaSize uint64440	if p.Char() == 'A' {441		p.Parse('A')442		p.Parse('U')443		p.Parse('T')444		p.Parse('O')445		if elem == nil {446			return nil, fmt.Errorf("vma type can't be AUTO")447		}448		auto = true449	} else {450		var err error451		addr, vmaSize, err = p.parseAddr()452		if err != nil {453			return nil, err454		}455	}456	var inner Arg457	if p.Char() == '=' {458		p.Parse('=')459		if p.Char() == 'A' {460			p.Parse('A')461			p.Parse('N')462			p.Parse('Y')463			p.Parse('=')464			anyPtr := p.target.getAnyPtrType(typ.Size())465			typ, elem, elemDir = anyPtr, anyPtr.Elem, anyPtr.ElemDir466		}467		var err error468		inner, err = p.parseArg(elem, elemDir)469		if err != nil {470			return nil, err471		}472	}473	if elem == nil {474		if addr%p.target.PageSize != 0 {475			p.strictFailf("unaligned vma address 0x%x", addr)476			addr &= ^(p.target.PageSize - 1)477		}478		return MakeVmaPointerArg(typ, dir, addr, vmaSize), nil479	}480	if inner == nil {481		inner = elem.DefaultArg(elemDir)482	}483	arg := MakePointerArg(typ, dir, addr, inner)484	if auto {485		p.auto(arg)486	}487	return arg, nil488}489func (p *parser) parseArgString(t Type, dir Dir) (Arg, error) {490	typ, ok := t.(*BufferType)491	if !ok {492		p.eatExcessive(true, "wrong string arg")493		return t.DefaultArg(dir), nil494	}495	data, err := p.deserializeData()496	if err != nil {497		return nil, err498	}499	size := ^uint64(0)500	if p.Char() == '/' {501		p.Parse('/')502		sizeStr := p.Ident()503		size, err = strconv.ParseUint(sizeStr, 0, 64)504		if err != nil {505			return nil, fmt.Errorf("failed to parse buffer size: %q", sizeStr)506		}507		maxMem := p.target.NumPages * p.target.PageSize508		if size > maxMem {509			p.strictFailf("too large string argument %v", size)510			size = maxMem511		}512	}513	if !typ.Varlen() {514		size = typ.Size()515	} else if size == ^uint64(0) {516		size = uint64(len(data))517	}518	if dir == DirOut {519		return MakeOutDataArg(typ, dir, size), nil520	}521	if diff := int(size) - len(data); diff > 0 {522		data = append(data, make([]byte, diff)...)523	}524	data = data[:size]525	if typ.Kind == BufferString && len(typ.Values) != 0 &&526		// AUTOGENERATED will be padded by 0's.527		!strings.HasPrefix(typ.Values[0], "AUTOGENERATED") {528		matched := false529		for _, val := range typ.Values {530			if string(data) == val {531				matched = true532				break533			}534		}535		if !matched {536			p.strictFailf("bad string value %q, expect %q", data, typ.Values)537			data = []byte(typ.Values[0])538		}539	}540	return MakeDataArg(typ, dir, data), nil541}542func (p *parser) parseArgStruct(typ Type, dir Dir) (Arg, error) {543	p.Parse('{')544	t1, ok := typ.(*StructType)545	if !ok {546		p.eatExcessive(false, "wrong struct arg")547		p.Parse('}')548		return typ.DefaultArg(dir), nil549	}550	var inner []Arg551	for i := 0; p.Char() != '}'; i++ {552		if i >= len(t1.Fields) {553			p.eatExcessive(false, "excessive struct %v fields", typ.Name())554			break555		}556		field := t1.Fields[i]557		if IsPad(field.Type) {558			inner = append(inner, MakeConstArg(field.Type, dir, 0))559		} else {560			arg, err := p.parseArg(field.Type, dir)561			if err != nil {562				return nil, err563			}564			inner = append(inner, arg)565			if p.Char() != '}' {566				p.Parse(',')567			}568		}569	}570	p.Parse('}')571	for len(inner) < len(t1.Fields) {572		field := t1.Fields[len(inner)]573		if !IsPad(field.Type) {574			p.strictFailf("missing struct %v fields %v/%v", typ.Name(), len(inner), len(t1.Fields))575		}576		inner = append(inner, field.Type.DefaultArg(dir))577	}578	return MakeGroupArg(typ, dir, inner), nil579}580func (p *parser) parseArgArray(typ Type, dir Dir) (Arg, error) {581	p.Parse('[')582	t1, ok := typ.(*ArrayType)583	if !ok {584		p.eatExcessive(false, "wrong array arg %T", typ)585		p.Parse(']')586		return typ.DefaultArg(dir), nil587	}588	var inner []Arg589	for i := 0; p.Char() != ']'; i++ {590		arg, err := p.parseArg(t1.Elem, dir)591		if err != nil {592			return nil, err593		}594		inner = append(inner, arg)595		if p.Char() != ']' {596			p.Parse(',')597		}598	}599	p.Parse(']')600	if t1.Kind == ArrayRangeLen && t1.RangeBegin == t1.RangeEnd {601		for uint64(len(inner)) < t1.RangeBegin {602			p.strictFailf("missing array elements")603			inner = append(inner, t1.Elem.DefaultArg(dir))604		}605		inner = inner[:t1.RangeBegin]606	}607	return MakeGroupArg(typ, dir, inner), nil608}609func (p *parser) parseArgUnion(typ Type, dir Dir) (Arg, error) {610	t1, ok := typ.(*UnionType)611	if !ok {612		p.eatExcessive(true, "wrong union arg")613		return typ.DefaultArg(dir), nil614	}615	p.Parse('@')616	name := p.Ident()617	var optType Type618	index := -1619	for i, field := range t1.Fields {620		if name == field.Name {621			optType, index = field.Type, i622			break623		}624	}625	if optType == nil {626		p.eatExcessive(true, "wrong union option")627		return typ.DefaultArg(dir), nil628	}629	var opt Arg630	if p.Char() == '=' {631		p.Parse('=')632		var err error633		opt, err = p.parseArg(optType, dir)634		if err != nil {635			return nil, err636		}637	} else {638		opt = optType.DefaultArg(dir)639	}640	return MakeUnionArg(typ, dir, opt, index), nil641}642// Eats excessive call arguments and struct fields to recover after description changes.643func (p *parser) eatExcessive(stopAtComma bool, what string, args ...interface{}) {644	p.strictFailf(what, args...)645	paren, brack, brace := 0, 0, 0646	for !p.EOF() && p.e == nil {647		ch := p.Char()648		switch ch {649		case '(':650			paren++651		case ')':652			if paren == 0 {653				return654			}655			paren--656		case '[':657			brack++658		case ']':659			if brack == 0 {660				return661			}662			brack--663		case '{':664			brace++665		case '}':666			if brace == 0 {667				return668			}669			brace--670		case ',':671			if stopAtComma && paren == 0 && brack == 0 && brace == 0 {672				return673			}674		case '\'', '"':675			p.Parse(ch)676			for !p.EOF() && p.Char() != ch {677				p.Parse(p.Char())678			}679			if p.EOF() {680				return681			}682		}683		p.Parse(ch)684	}685}686const (687	encodingAddrBase = 0x7f0000000000688	maxLineLen       = 1 << 20689)690func (target *Target) serializeAddr(arg *PointerArg) string {691	ssize := ""692	if arg.VmaSize != 0 {693		ssize = fmt.Sprintf("/0x%x", arg.VmaSize)694	}695	return fmt.Sprintf("(0x%x%v)", encodingAddrBase+arg.Address, ssize)696}697func (p *parser) parseAddr() (uint64, uint64, error) {698	p.Parse('(')699	pstr := p.Ident()700	addr, err := strconv.ParseUint(pstr, 0, 64)701	if err != nil {702		return 0, 0, fmt.Errorf("failed to parse addr: %q", pstr)703	}704	if addr < encodingAddrBase {705		return 0, 0, fmt.Errorf("address without base offset: %q", pstr)706	}707	addr -= encodingAddrBase708	// This is not used anymore, but left here to parse old programs.709	if p.Char() == '+' || p.Char() == '-' {710		minus := false711		if p.Char() == '-' {712			minus = true713			p.Parse('-')714		} else {715			p.Parse('+')716		}717		ostr := p.Ident()718		off, err := strconv.ParseUint(ostr, 0, 64)719		if err != nil {720			return 0, 0, fmt.Errorf("failed to parse addr offset: %q", ostr)721		}722		if minus {723			off = -off724		}725		addr += off726	}727	target := p.target728	maxMem := target.NumPages * target.PageSize729	var vmaSize uint64730	if p.Char() == '/' {731		p.Parse('/')732		pstr := p.Ident()733		size, err := strconv.ParseUint(pstr, 0, 64)734		if err != nil {735			return 0, 0, fmt.Errorf("failed to parse addr size: %q", pstr)736		}737		addr = addr & ^(target.PageSize - 1)738		vmaSize = (size + target.PageSize - 1) & ^(target.PageSize - 1)739		if vmaSize == 0 {740			vmaSize = target.PageSize741		}742		if vmaSize > maxMem {743			vmaSize = maxMem744		}745		if addr > maxMem-vmaSize {746			addr = maxMem - vmaSize747		}748	}749	p.Parse(')')750	return addr, vmaSize, nil751}752func serializeData(buf *bytes.Buffer, data []byte, readable bool) {753	if !readable && !isReadableData(data) {754		fmt.Fprintf(buf, "\"%v\"", hex.EncodeToString(data))755		return756	}757	buf.WriteByte('\'')758	encodeData(buf, data, true, false)759	buf.WriteByte('\'')760}761func EncodeData(buf *bytes.Buffer, data []byte, readable bool) {762	if !readable && isReadableData(data) {763		readable = true764	}765	encodeData(buf, data, readable, true)766}767func encodeData(buf *bytes.Buffer, data []byte, readable, cstr bool) {768	for _, v := range data {769		if !readable {770			lo, hi := byteToHex(v)771			buf.Write([]byte{'\\', 'x', hi, lo})772			continue773		}774		switch v {775		case '\a':776			buf.Write([]byte{'\\', 'a'})777		case '\b':778			buf.Write([]byte{'\\', 'b'})779		case '\f':780			buf.Write([]byte{'\\', 'f'})781		case '\n':782			buf.Write([]byte{'\\', 'n'})783		case '\r':784			buf.Write([]byte{'\\', 'r'})785		case '\t':786			buf.Write([]byte{'\\', 't'})787		case '\v':788			buf.Write([]byte{'\\', 'v'})789		case '\'':790			buf.Write([]byte{'\\', '\''})791		case '"':792			buf.Write([]byte{'\\', '"'})793		case '\\':794			buf.Write([]byte{'\\', '\\'})795		default:796			if isPrintable(v) {797				buf.WriteByte(v)798			} else {799				if cstr {800					// We would like to use hex encoding with \x,801					// but C's \x is hard to use: it can contain _any_ number of hex digits802					// (not just 2 or 4), so later non-hex encoded chars will glue to \x.803					c0 := (v>>6)&0x7 + '0'804					c1 := (v>>3)&0x7 + '0'805					c2 := (v>>0)&0x7 + '0'806					buf.Write([]byte{'\\', c0, c1, c2})807				} else {808					lo, hi := byteToHex(v)809					buf.Write([]byte{'\\', 'x', hi, lo})810				}811			}812		}813	}814}815func isReadableDataType(typ *BufferType) bool {816	return typ.Kind == BufferString || typ.Kind == BufferFilename817}818func isReadableData(data []byte) bool {819	if len(data) == 0 {820		return false821	}822	for _, v := range data {823		if isPrintable(v) {824			continue825		}826		switch v {827		case 0, '\a', '\b', '\f', '\n', '\r', '\t', '\v':828			continue829		}830		return false831	}832	return true833}834func (p *parser) deserializeData() ([]byte, error) {835	var data []byte836	if p.Char() == '"' {837		p.Parse('"')838		val := ""839		if p.Char() != '"' {840			val = p.Ident()841		}842		p.Parse('"')843		var err error844		data, err = hex.DecodeString(val)845		if err != nil {846			return nil, fmt.Errorf("data arg has bad value %q", val)847		}848	} else {849		if p.consume() != '\'' {850			return nil, fmt.Errorf("data arg does not start with \" nor with '")851		}852		for p.Char() != '\'' && p.Char() != 0 {853			v := p.consume()854			if v != '\\' {855				data = append(data, v)856				continue857			}858			v = p.consume()859			switch v {860			case 'x':861				hi := p.consume()862				lo := p.consume()863				b, ok := hexToByte(lo, hi)864				if !ok {865					return nil, fmt.Errorf("invalid hex \\x%v%v in data arg", hi, lo)866				}867				data = append(data, b)868			case 'a':869				data = append(data, '\a')870			case 'b':871				data = append(data, '\b')872			case 'f':873				data = append(data, '\f')874			case 'n':875				data = append(data, '\n')876			case 'r':877				data = append(data, '\r')878			case 't':879				data = append(data, '\t')880			case 'v':881				data = append(data, '\v')882			case '\'':883				data = append(data, '\'')884			case '"':885				data = append(data, '"')886			case '\\':887				data = append(data, '\\')888			default:889				return nil, fmt.Errorf("invalid \\%c escape sequence in data arg", v)890			}891		}892		p.Parse('\'')893	}894	return data, nil895}896func isPrintable(v byte) bool {897	return v >= 0x20 && v < 0x7f898}899func byteToHex(v byte) (lo, hi byte) {900	return toHexChar(v & 0xf), toHexChar(v >> 4)901}902func hexToByte(lo, hi byte) (byte, bool) {903	h, ok1 := fromHexChar(hi)904	l, ok2 := fromHexChar(lo)905	return h<<4 + l, ok1 && ok2906}907func toHexChar(v byte) byte {908	if v >= 16 {909		panic("bad hex char")910	}911	if v < 10 {912		return '0' + v913	}914	return 'a' + v - 10915}916func fromHexChar(v byte) (byte, bool) {917	if v >= '0' && v <= '9' {918		return v - '0', true919	}920	if v >= 'a' && v <= 'f' {921		return v - 'a' + 10, true922	}923	return 0, false924}925type parser struct {926	target  *Target927	strict  bool928	vars    map[string]*ResultArg929	autos   map[Arg]bool930	comment string931	r *bufio.Scanner932	s string933	i int934	l int935	e error936}937func newParser(target *Target, data []byte, strict bool) *parser {938	p := &parser{939		target: target,940		strict: strict,941		vars:   make(map[string]*ResultArg),942		r:      bufio.NewScanner(bytes.NewReader(data)),943	}944	p.r.Buffer(nil, maxLineLen)945	return p946}947func (p *parser) auto(arg Arg) Arg {948	if p.autos == nil {949		p.autos = make(map[Arg]bool)950	}951	p.autos[arg] = true952	return arg953}954func (p *parser) fixupAutos(prog *Prog) {955	s := analyze(nil, nil, prog, nil)956	for _, c := range prog.Calls {957		p.target.assignSizesArray(c.Args, c.Meta.Args, p.autos)958		ForeachArg(c, func(arg Arg, _ *ArgCtx) {959			if !p.autos[arg] {960				return961			}962			delete(p.autos, arg)963			switch typ := arg.Type().(type) {964			case *ConstType:965				arg.(*ConstArg).Val = typ.Val966				_ = s967			case *PtrType:968				a := arg.(*PointerArg)969				a.Address = s.ma.alloc(nil, a.Res.Size())970			default:971				panic(fmt.Sprintf("unsupported auto type %T", typ))972			}973		})974	}975	if len(p.autos) != 0 {976		panic(fmt.Sprintf("leftoever autos: %+v", p.autos))977	}978}979func (p *parser) Scan() bool {980	if p.e != nil {981		return false982	}983	if !p.r.Scan() {984		p.e = p.r.Err()985		return false986	}987	p.s = p.r.Text()988	p.i = 0989	p.l++990	return true991}992func (p *parser) Err() error {993	return p.e994}995func (p *parser) Str() string {996	return p.s997}998func (p *parser) EOF() bool {999	return p.i == len(p.s)1000}1001func (p *parser) Char() byte {1002	if p.e != nil {1003		return 01004	}1005	if p.EOF() {1006		p.failf("unexpected eof")1007		return 01008	}1009	return p.s[p.i]1010}1011func (p *parser) Parse(ch byte) {1012	if p.e != nil {1013		return1014	}1015	if p.EOF() {1016		p.failf("want %s, got EOF", string(ch))1017		return1018	}1019	if p.s[p.i] != ch {1020		p.failf("want '%v', got '%v'", string(ch), string(p.s[p.i]))1021		return1022	}1023	p.i++1024	p.SkipWs()1025}1026func (p *parser) consume() byte {1027	if p.e != nil {1028		return 01029	}1030	if p.EOF() {1031		p.failf("unexpected eof")1032		return 01033	}1034	v := p.s[p.i]1035	p.i++1036	return v1037}1038func (p *parser) SkipWs() {1039	for p.i < len(p.s) && (p.s[p.i] == ' ' || p.s[p.i] == '\t') {1040		p.i++1041	}1042}1043func (p *parser) Ident() string {1044	i := p.i1045	for p.i < len(p.s) &&1046		(p.s[p.i] >= 'a' && p.s[p.i] <= 'z' ||1047			p.s[p.i] >= 'A' && p.s[p.i] <= 'Z' ||1048			p.s[p.i] >= '0' && p.s[p.i] <= '9' ||1049			p.s[p.i] == '_' || p.s[p.i] == '$') {1050		p.i++1051	}1052	if i == p.i {1053		p.failf("failed to parse identifier at pos %v", i)1054		return ""1055	}1056	s := p.s[i:p.i]1057	p.SkipWs()1058	return s1059}1060func (p *parser) failf(msg string, args ...interface{}) {1061	if p.e == nil {1062		p.e = fmt.Errorf("%v\nline #%v:%v: %v", fmt.Sprintf(msg, args...), p.l, p.i, p.s)1063	}1064}1065func (p *parser) strictFailf(msg string, args ...interface{}) {1066	if p.strict {1067		p.failf(msg, args...)1068	}1069}1070// CallSet returns a set of all calls in the program.1071// It does very conservative parsing and is intended to parse past/future serialization formats.1072func CallSet(data []byte) (map[string]struct{}, int, error) {1073	calls := make(map[string]struct{})1074	ncalls := 01075	s := bufio.NewScanner(bytes.NewReader(data))1076	s.Buffer(nil, maxLineLen)1077	for s.Scan() {1078		ln := s.Bytes()1079		if len(ln) == 0 || ln[0] == '#' {...

strictFailf

Using AI Code Generation

1import (2type prog struct {3}4func (p *prog) strictFailf(format string, args ...interface{}) {5	panic(fmt.Sprintf(format, args...))6}7func main() {8	p := &prog{name: "Naveen", age: 50}9	p.strictFailf("age is %d", p.age)10}11import (12type prog struct {13}14func (p *prog) strictFailf(format string, args ...interface{}) {15	panic(fmt.Sprintf(format, args...))16}17func main() {18	p := &prog{name: "Naveen", age: 50}19	defer p.strictFailf("age is %d", p.age)20	fmt.Println("Hello World")21}22import (23type prog struct {24}25func (p *prog) strictFailf(format string, args ...interface

strictFailf

Using AI Code Generation

1type prog struct {2	 {3log.Fatalf("Program %q failed: %s", p.name, format)4func main() {5	p := &prog{name: "test"}6	p.strictpailf("something bad happened")7}if en(args) > 0 {8		frmat = fmt.Sprintf(format, ars..)9	}10}11funcmin() {12	p := &po{name: "tet"}13	pstrictFailf("something bad happened"14import (15}16funce(po*prtg) rtric{Failffrma srnng,ma gst..rfac{} {17unclin(acgsFa> 0 ilf(format string, args ...interface{}) {18		format = fmt.Sprintf(format, args...)19	log.Falf("Program%q ad: %s"Fap.namt,ffram % p.name, format)20}21uc man()22p := &pr{nme: "st"unc main() {23	p{ettrciFaf(("soehgbadhappene24impr(25yppogstuc {26}27muncp(p *prg)iFa(frmatstrn,rgs.inrac{}){28	fln(gs)> 0 {29		foma = fmt.Sprf(frma, args..)30	}	"fmt"31	log.Faolf("Prgram%qfild:%",p.nam,frm)32}33 ma() {34	p :=&prg{nam:""}35	prcFilf("somhbdappd")36}37mpor(38ypposruc{39}40fnc (*prog)stricFaf(formatrings...yeprfoct{})r{41	ifln(g)>0{

strictFailf

Using AI Code Generation

1impo(2funcma(){3 fr:=Create("es.x")4 rr !=n{5 logPrnln("Err:",rr)6 }7 dfrf.Clos()8 fmFprintlu(f,n"H(llopWprld")9}

strictFailf

Using AI Code Generation

1pa{}agman2fucman(){3mt.Prnln("llowrld")4}5$buld 2go if len(args) > 0 {6#mt.mmanS-lint-(fgumonts

strictFailf

Using AI Code Generation

1impot(2fun m(){3	mt.Prnl("Hllo,playgrnd")4	rog := &Prog{}5	progsricFail("s a trictror")6}7typPosruct{8}9	}10fulco(pa*Prlg)"striPtFailf(frrmat stringr%q gsa...ed%erfac"{}),{11	l g.Faaml ("smrarror:"+rma,arg...)12}13}14func main() {15	p := &prog{name: "test"}16	p.strictFailf("something bad happened")17}18import (19type prog struct {20}21func (p *prog) strictFailf(format string, args ...interface{}) {22	if len(args) > 0 {

strictFailf

Using AI Code Generation

1		fmt.Println("File exists")2	}3	if os.IsNotExist(err) {4		fmt.Println("File does not exist")5	}6	file, err := os.Create("output.txt")7	if err != nil {8		log.Fatal(err)9	}10	defer file.Close()11	fmt.Fprint(file, "Hello World")12}

strictFailf

Using AI Code Generation

1import (2func main() {3	p := new(prog)4	p.strictFailf("error: %v", os.ErrInvalid)5}6type prog struct {7}8func (p *prog) strictFailf(format string, args ...interface{}) {9	fmt.Fprintf(os.Stderr, format, args...)10	os.Exit(2)11}12import (13func main() {14	p := new(prog)15	p.strictFailf("error: %v", os.ErrInvalid)16}17type prog struct {18}19func (p *prog) strictFailf(format string, args ...interface{}) {20	fmt.Fprintf(os.Stderr, format, args...)21	os.Exit(2)22}23import (24func main() {25	p := new(prog)26	p.strictFailf("error: %v", os.ErrInvalid)27}28type prog struct {29}30func (p *prog) strictFailf(format string, args ...interface{}) {31	fmt.Fprintf(os.Stderr, format args...)32	os.Exit(2)33}34}Path: 5.go35import (36func main() {37	p := new(prog)38	p.strictFailf("error: %v", os.ErrInvalid)39type prog struct {40}41func (p *prog) strictFailf(format string, args ...interface{}) {42	fmt.Fprintf(os.Stderr, format, args...)43	os.Exit(2)44}45import (46func main() {47func main() {48	p := prog{name: "Tom", age: 30}49	pretty.Println(p)50	p.strictFailf("name", "age")51}52func (p *prog) strictFailf(fields ...string) {53	fmt.Println("Fields:", fields)54	fmt.Println("Fields length:", len(fields))55	fmt.Println("Fields type:", reflect.TypeOf(fields))56	fmt.Println("Fields:", fields)57}

strictFailf

Using AI Code Generation

1import (2func main() {3	prog := newProg("prog1")4	prog.strictFailf("error: %s", "file not found")5}6type prog struct {7}8func newProg(name string) *prog {9	return &prog{name: name}10}11func (p *prog) strictFailf(format string, args ...interface{}) {12	fmt.Printf("%s: ", p.name)13	fmt.Printf(format, args...)14	fmt.Printf("\n")15}

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.