X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=hacks%2Fspeedmine.c;h=175e1a538c4d6a14c2d891395b3352386e0baf8f;hb=6cee540bdbb571485cd5e519f89f389faebd0495;hp=64f8578a5ae27e9119e3d6206ead53e56cd5dc85;hpb=3c58fb6311db49c46f1670922933b27c6ea0c065;p=xscreensaver

diff --git a/hacks/speedmine.c b/hacks/speedmine.c
index 64f8578a..175e1a53 100644
--- a/hacks/speedmine.c
+++ b/hacks/speedmine.c
@@ -116,6 +116,11 @@ static double step=0.0;
 #define BACKWARDS -1
 static int direction = FORWARDS;
 
+/* Apparently AIX's math.h bogusly defines `nearest' as a function,
+   in violation of the ANSI C spec. */
+#undef nearest
+#define nearest n3arest
+
 static int pindex=0, nearest=0;
 static int flipped_at=0;
 static int xoffset=0, yoffset=0;
@@ -272,9 +277,14 @@ perspective (void)
 		zfactor = (double)depth* (12.0 - TERRAIN_LENGTH/8.0) * zf;
 		for (j=0; j < TERRAIN_BREADTH; j++) {
 			jj = direction * j; MODULO(jj, TERRAIN_BREADTH);
-			xx = (worldx[i][jj]-(vertigo*xcc))/zfactor; 
-			yy = (worldy[i][j]-(vertigo*ycc))/zfactor;
-
+            /* jwz: not totally sure if this is right, but it avoids div0 */
+            if (zfactor != 0) {
+                xx = (worldx[i][jj]-(vertigo*xcc))/zfactor;
+                yy = (worldy[i][j]-(vertigo*ycc))/zfactor;
+            } else {
+                xx = 0;
+                yy = 0;
+            }
 			r = rotation_bias + (int)(vertigo*zcc); MODULO(r, ROTS);
 
 			xvals[t][j] = xoffset + width/2 +