Fix "jump to label 'foo' crosses initialization of 'bar'" errors

Newer C++ compilers do not allow goto-ing over an initialized variable
declaration, as this violates C++98. We address this by (in most cases)
separating the initialization from the declaration, or moving the goto to
an equivalent location.

Refer to the following discussions for more background:

http://stackoverflow.com/questions/11306799/why-does-c-enforce-such-behavior-in-crosses-initialization
http://stackoverflow.com/questions/12992108/crosses-initialization-of-variable-only-when-initialization-combined-with-decl

bsp.cpp

@@ -169,7 +169,7 @@ SBsp3 *SBsp3::InsertConvex(STriMeta meta, Vector *vertex, int cnt,
     bool isPos[MAX_VERTICES];
     bool isNeg[MAX_VERTICES];
     bool isOn[MAX_VERTICES];
-    int posc = 0, negc = 0, onc = 0;
+    int posc, negc, onc; posc = negc = onc = 0;
     for(i = 0; i < cnt; i++) {
         double dt = n.Dot(vertex[i]);
         isPos[i] = isNeg[i] = isOn[i] = false;
@@ -207,10 +207,10 @@ SBsp3 *SBsp3::InsertConvex(STriMeta meta, Vector *vertex, int cnt,
 
     Vector vpos[MAX_VERTICES];
     Vector vneg[MAX_VERTICES];
-    int npos = 0, nneg = 0;
+    int npos, nneg; npos = nneg = 0;
 
     Vector inter[2];
-    int inters = 0;
+    int inters; inters = 0;
 
     for(i = 0; i < cnt; i++) {
         int ip = WRAP((i + 1), cnt);

export.cpp

@@ -685,11 +685,11 @@ void SolveSpace::ExportAsPngTo(char *filename) {
     FILE *f = fopen(filename, "wb");
     if(!f) goto err;
 
-    png_struct *png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
+    png_struct *png_ptr; png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
         NULL, NULL, NULL);
     if(!png_ptr) goto err;
 
-    png_info *info_ptr = png_create_info_struct(png_ptr);
+    png_info *info_ptr; info_ptr = png_create_info_struct(png_ptr);
     if(!png_ptr) goto err;
 
     if(setjmp(png_jmpbuf(png_ptr))) goto err;
@@ -708,8 +708,8 @@ void SolveSpace::ExportAsPngTo(char *filename) {
     png_write_info(png_ptr, info_ptr);
 
     // Get the pixel data from the framebuffer
-    BYTE *pixels = (BYTE *)AllocTemporary(3*w*h);
-    BYTE **rowptrs = (BYTE **)AllocTemporary(h*sizeof(BYTE *));
+    BYTE *pixels; pixels = (BYTE *)AllocTemporary(3*w*h);
+    BYTE **rowptrs; rowptrs = (BYTE **)AllocTemporary(h*sizeof(BYTE *));
     glReadPixels(0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 
     int y;

mesh.cpp

@@ -389,14 +389,15 @@ SKdNode *SKdNode::From(STriangleLl *tll) {
     int which = 0;
     SKdNode *ret = Alloc();
 
-    if(!tll) {
-        goto leaf;
-    }
-
     int i;
     int gtc[3] = { 0, 0, 0 }, ltc[3] = { 0, 0, 0 }, allc = 0;
     double badness[3] = { 0, 0, 0 };
     double split[3] = { 0, 0, 0 };
+
+    if(!tll) {
+        goto leaf;
+    }
+
     for(i = 0; i < 3; i++) {
         int tcnt = 0;
         STriangleLl *ll;
@@ -445,7 +446,7 @@ SKdNode *SKdNode::From(STriangleLl *tll) {
     }
 
     STriangleLl *ll;
-    STriangleLl *lgt = NULL, *llt = NULL;
+    STriangleLl *lgt, *llt; lgt = llt = NULL;
     for(ll = tll; ll; ll = ll->next) {
         STriangle *tr = ll->tri;
         

style.cpp

@@ -399,14 +399,14 @@ void TextWindow::ScreenBackgroundImage(int link, DWORD v) {
         png_read_png(png_ptr, info_ptr,
             PNG_TRANSFORM_EXPAND | PNG_TRANSFORM_STRIP_ALPHA, NULL);
         
-        int w = info_ptr->width,
-            h = info_ptr->height;
-        BYTE **rows = png_get_rows(png_ptr, info_ptr);
+        int w; w = (int)info_ptr->width;
+        int h; h = (int)info_ptr->height;
+        BYTE **rows; rows = png_get_rows(png_ptr, info_ptr);
 
         // Round to next-highest powers of two, since the textures require
         // that. And round up to 4, to guarantee DWORD alignment.
-        int rw = max(4, RoundUpToPowerOfTwo(w)),
-            rh = max(4, RoundUpToPowerOfTwo(h));
+        int rw; rw = max(4, RoundUpToPowerOfTwo(w));
+        int rh; rh = max(4, RoundUpToPowerOfTwo(h));
 
         SS.bgImage.fromFile = (BYTE *)MemAlloc(rw*rh*3);
         for(int i = 0; i < h; i++) {

system.cpp

@@ -449,7 +449,7 @@ int System::Solve(Group *g, int *dof, List<hConstraint> *bad,
 
     EvalJacobian();
 
-    int rank = CalculateRank();
+    int rank; rank = CalculateRank();
     if(rank != mat.m) {
         if(andFindBad) {
             FindWhichToRemoveToFixJacobian(g, bad);

textscreens.cpp

@@ -383,7 +383,7 @@ void TextWindow::ShowGroupInfo(void) {
         &TextWindow::ScreenChangeGroupOption,
         g->visible ? CHECK_TRUE : CHECK_FALSE);
 
-    Group *pg = g->PreviousGroup();
+    Group *pg; pg = g->PreviousGroup();
     if(pg && pg->runningMesh.IsEmpty() && g->thisMesh.IsEmpty()) {
         Printf(false, " %f%Lf%Fd%c  force NURBS surfaces to triangle mesh",
             &TextWindow::ScreenChangeGroupOption,