r16364 - lwpoly_construct_circle: Avoid division by zero (Raúl Marín Rodríguez)
Paul Ramsey
pramsey at cleverelephant.ca
Fri Jan 26 07:01:15 PST 2018
Author: pramsey
Date: 2018-01-26 07:01:15 -0800 (Fri, 26 Jan 2018)
New Revision: 16364
Modified:
trunk/liblwgeom/lwpoly.c
Log:
lwpoly_construct_circle: Avoid division by zero (Raúl Marín Rodríguez)
Closes #4003
Closes #199
Modified: trunk/liblwgeom/lwpoly.c
===================================================================
--- trunk/liblwgeom/lwpoly.c 2018-01-26 14:56:52 UTC (rev 16363)
+++ trunk/liblwgeom/lwpoly.c 2018-01-26 15:01:15 UTC (rev 16364)
@@ -120,13 +120,13 @@
lwpoly_construct_circle(int srid, double x, double y, double radius, uint32_t segments_per_quarter, char exterior)
{
const uint32_t segments = 4*segments_per_quarter;
- const double theta = 2*M_PI / segments;
+ double theta;
LWPOLY *lwpoly;
POINTARRAY *pa;
POINT4D pt;
uint32_t i;
- if (segments_per_quarter < 1)
+ if (segments_per_quarter == 0)
{
lwerror("Need at least one segment per quarter-circle.");
return NULL;
@@ -138,6 +138,8 @@
return NULL;
}
+ theta = 2*M_PI / segments;
+
lwpoly = lwpoly_construct_empty(srid, LW_FALSE, LW_FALSE);
pa = ptarray_construct_empty(LW_FALSE, LW_FALSE, segments + 1);
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