Soluções para desafios de detecção de bugs oferecidos pela equipe PVS-Studio nas conferências em 2018-2019

2018

C ++

static const int kDaysInMonth[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; bool ValidateDateTime(const DateTime& time) { if (time.year < 1 || time.year > 9999 || time.month < 1 || time.month > 12 || time.day < 1 || time.day > 31 || time.hour < 0 || time.hour > 23 || time.minute < 0 || time.minute > 59 || time.second < 0 || time.second > 59) { return false; } if (time.month == 2 && IsLeapYear(time.year)) { return time.month <= kDaysInMonth[time.month] + 1; } else { return time.month <= kDaysInMonth[time.month]; } } 

 if (time.month == 2 && IsLeapYear(time.year)) { return time.month <= kDaysInMonth[time.month] + 1; // <= day } else { return time.month <= kDaysInMonth[time.month]; // <= day } 

 bool VertInfluencedByActiveBone( FParticleEmitterInstance* Owner, USkeletalMeshComponent* InSkelMeshComponent, int32 InVertexIndex, int32* OutBoneIndex = NULL); void UParticleModuleLocationSkelVertSurface::Spawn(....) { .... int32 BoneIndex1, BoneIndex2, BoneIndex3; BoneIndex1 = BoneIndex2 = BoneIndex3 = INDEX_NONE; if(!VertInfluencedByActiveBone( Owner, SourceComponent, VertIndex[0], &BoneIndex1) && !VertInfluencedByActiveBone( Owner, SourceComponent, VertIndex[1], &BoneIndex2) && !VertInfluencedByActiveBone( Owner, SourceComponent, VertIndex[2]) &BoneIndex3) { .... } 

 if (!foo(....) && !foo(....) && !foo(....) & arg) 

 if(!VertInfluencedByActiveBone( Owner, SourceComponent, VertIndex[0], &BoneIndex1) && !VertInfluencedByActiveBone( Owner, SourceComponent, VertIndex[1], &BoneIndex2) && !VertInfluencedByActiveBone( Owner, SourceComponent, VertIndex[2], &BoneIndex3)) 

 void TagMonitor::parseTagsToMonitor(String8 tagNames) { std::lock_guard<std::mutex> lock(mMonitorMutex); // Expand shorthands if (ssize_t idx = tagNames.find("3a") != -1) { ssize_t end = tagNames.find(",", idx); char* start = tagNames.lockBuffer(tagNames.size()); start[idx] = '\0'; .... } .... } 

 if (ssize_t idx = (tagNames.find("3a") != -1)) 

 ssize_t idx = tagNames.find("3a"); if (idx != -1) 

 typedef int32_t GGLfixed; GGLfixed gglFastDivx(GGLfixed n, GGLfixed d) { if ((d>>24) && ((d>>24)+1)) { n >>= 8; d >>= 8; } return gglMulx(n, gglRecip(d)); } 

2019

C ++

 int foo(const unsigned char *s) { int r = 0; while(*s) { r += ((r * 20891 + *s *200) | *s ^ 4 | *s ^ 3) ^ (r >> 1); s++; } return r & 0x7fffffff; } 

 static inline const QMetaObjectPrivate *priv(const uint* data) { return reinterpret_cast<const QMetaObjectPrivate*>(data); } bool QMetaEnum::isFlag() const { const int offset = priv(mobj->d.data)->revision >= 8 ? 2 : 1; return mobj && mobj->d.data[handle + offset] & EnumIsFlag; } 

C #

 public static void WriteAttribute(TextWriter writer, string name, object defaultValue, object value, Func<object, string> converter = null) { if ( defaultValue == null && value == null || value.Equals(defaultValue)) { return; } string stringValue = converter == null ? value.ToString() : converter(value); writer.Write($"{name}=\"{stringValue}\" "); } 

 public class FastString { private const int initCapacity = 32; private void Init(int iniCapacity) { sb = new StringBuilder(iniCapacity); .... } public FastString() { Init(initCapacity); } public FastString(int iniCapacity) { Init(initCapacity); } public StringBuilder StringBuilder => sb; } .... Console.WriteLine(new FastString(256).StringBuilder.Capacity); 

 public FastString(int iniCapacity){ Init(initCapacity); } 

 private SyntaxNode GetNode(SyntaxNode root) { var current = root; .... while (current.FullSpan.Contains(....)) { .... var nodeOrToken = current.ChildThatContainsPosition(....); .... current = nodeOrToken.AsNode(); } .... } public SyntaxNode AsNode() { if (_token != null) { return null; } return _nodeOrParent; } 

 .... staticFields = packedSnapshot.typeDescriptions .Where(t => t.staticFieldBytes != null & t.staticFieldBytes.Length > 0) .Select(t => UnpackStaticFields(t)) .ToArray() .... 

Java

 private static boolean checkSentenceCapitalization(@NotNull String value) { List<String> words = StringUtil.split(value, " "); .... int capitalized = 1; .... return capitalized / words.size() < 0.2; // allow reasonable amount of // capitalized words } 

 public static String getXMLType(@WillNotClose InputStream in) throws IOException { .... String s; int count = 0; while (count < 4) { s = r.readLine(); if (s == null) { break; } Matcher m = tag.matcher(s); if (m.find()) { return m.group(1); } } throw new IOException("Didn't find xml tag"); .... }