Examples of errors detected by the V537 diagnostic

V537. Potential incorrect use of item 'X'. Consider inspecting the expression.

IPP Samples

V537 Consider reviewing the correctness of 'sprite_left_coordinate' item's usage. mpeg4_enc mp4_enc_misc.cpp 387

Ipp32s ippVideoEncoderMPEG4::Init(mp4_Param *par)
{
  ....
  VOL.obmc_disable = par->obmc_disable;
  VOL.sprite_enable = par->sprite_enable;
  VOL.sprite_width = par->sprite_width;
  VOL.sprite_height = par->sprite_height;
  VOL.sprite_left_coordinate = par->sprite_left_coordinate;
  VOL.sprite_top_coordinate = par->sprite_left_coordinate;
  ....
}

An object copying error. The programmer made a misprint and typed a wrong variable.

Miranda IM

V537 Consider reviewing the correctness of 'maxX' item's usage. clist_modern modern_skinengine.cpp 2898

static BOOL ske_DrawTextEffect(....)
{
  ....
  minX=max(0,minX+mcLeftStart-2);
  minY=max(0,minY+mcTopStart-2);
  maxX=min((int)width,maxX+mcRightEnd-1);
  maxY=min((int)height,maxX+mcBottomEnd-1);
  ....
}

Most likely this is what should be written here: maxY=min((int)height,maxY+mcBottomEnd-1);

ReactOS

V537 Consider reviewing the correctness of 'x' item's usage. win32k bitblt.c 670

BOOL APIENTRY
GreStretchBltMask(....)
{
  ....
  MaskPoint.x += DCMask->ptlDCOrig.x;
  MaskPoint.y += DCMask->ptlDCOrig.x;
  ....
}

Most likely this is what should be written here: MaskPoint.y += DCMask->ptlDCOrig.y;

ReactOS

V537 Consider reviewing the correctness of 'X' item's usage. gdiplus region.c 715

GpStatus WINGDIPAPI GdipGetRegionBoundsI()
{
  ....
  if(status == Ok){
    rect->X = roundr(rectf.X);
    rect->Y = roundr(rectf.X);
    rect->Width  = roundr(rectf.Width);
    rect->Height = roundr(rectf.Height);
  }
  ....
}

This is what should have been written here: rect->Y = roundr(rectf.Y);

Quake-III-Arena

V537 Consider reviewing the correctness of 'scale_x' item's usage. Radiant terrain.cpp 1408

void Terrain_AddMovePoint(....) {
  ....
  x = ( v[ 0 ] - p->origin[ 0 ] ) / p->scale_x;
  y = ( v[ 1 ] - p->origin[ 1 ] ) / p->scale_x;
  ....
}

This is what should have been written here: y = ( v[ 1 ] - p->origin[ 1 ] ) / p->scale_y;

Trinity Core

V537 Consider reviewing the correctness of 'y' item's usage. g3dlib vector3int32.h 77

inline Vector3int32& operator+=(const Vector3int32& other) {
  x += other.x;
  y += other.y;
  z += other.y;    // <=
  return *this;
}

Blender

V537 Consider reviewing the correctness of 'x0' item's usage. extern_openjpeg tcd.c 650

void tcd_malloc_decode(....) {
  ....
  x0 = j == 0 ? tilec->x0 :
                int_min(x0, (unsigned int) tilec->x0);
  y0 = j == 0 ? tilec->y0 :
                int_min(y0, (unsigned int) tilec->x0);  // <=
  x1 = j == 0 ? tilec->x1 :
                int_max(x1, (unsigned int) tilec->x1);
  y1 = j == 0 ? tilec->y1 :
                int_max(y1, (unsigned int) tilec->y1);
  ....
}

Source Engine SDK

V537 Consider reviewing the correctness of 'y' item's usage. Raytrace trace2.cpp 189

class ALIGN16 FourVectors
{
public:
  fltx4 x, y, z;
  ....
};

FourVectors BackgroundColor;

void RayTracingEnvironment::RenderScene(....)
{
  ....
  intens.x=OrSIMD(AndSIMD(BackgroundColor.x,no_hit_mask),
                  AndNotSIMD(no_hit_mask,intens.x));
  intens.y=OrSIMD(AndSIMD(BackgroundColor.y,no_hit_mask),
                  AndNotSIMD(no_hit_mask,intens.y));
  intens.z=OrSIMD(AndSIMD(BackgroundColor.y,no_hit_mask),
                  AndNotSIMD(no_hit_mask,intens.z));

  ....
}

This is what should have been written here: intens.z=OrSIMD(AndSIMD(BackgroundColor.z,no_hit_mask), AndNotSIMD(no_hit_mask,intens.z));

Expat

V537 Consider reviewing the correctness of 'att1' item's usage. xmlwf.c 160

static int
nsattcmp(const void *p1, const void *p2)
{
  const XML_Char *att1 = *(const XML_Char **)p1;
  const XML_Char *att2 = *(const XML_Char **)p2;
  int sep1 = (tcsrchr(att1, NSSEP) != 0);
  int sep2 = (tcsrchr(att1, NSSEP) != 0);
  if (sep1 != sep2)
    return sep1 - sep2;
  return tcscmp(att1, att2);
}

FreeCAD

V537 [CWE-682] Consider reviewing the correctness of 'isArc1' item's usage. GeometryMatcher.cpp 242

TopoDS_Edge GeometryUtils::asCircle(TopoDS_Edge occEdge, bool& arc);

bool GeometryMatcher::compareBSplines(TopoDS_Edge &edge1, TopoDS_Edge &edge2)
{
  ....
  BRepAdaptor_Curve adapt1(edge1);
  BRepAdaptor_Curve adapt2(edge2);
  bool isArc1(false);
  bool isArc2(false);
  TopoDS_Edge circleEdge1;
  TopoDS_Edge circleEdge2;
  try {
    circleEdge1 = GeometryUtils::asCircle(edge1, isArc1);
    circleEdge2 = GeometryUtils::asCircle(edge2, isArc1);    // <=
  }
  catch (Base::RuntimeError&) {
    Base::Console().Error(....);
    return false;
  }
  if (!isArc1 && !isArc2) {
    return compareCircles(circleEdge1, circleEdge2);
  }
  if (isArc1 && isArc2) {
    return compareCircleArcs(circleEdge1, circleEdge2);
  }

  return false;
}