databases/pgsphere: stop using VLAs to fix PG12 compilation

PR:		248657
Reported by:	vvd@unislabs.com
Obtained from:	https://github.com/akorotkov/pgsphere/pull/14
Sponsored by:	BBOX.io

1 files changed, 54 insertions, 0 deletions

diff --git a/databases/pgsphere/files/patch-polygon.c b/databases/pgsphere/files/patch-polygon.c
new file mode 100644
index 000000000000..15ff051fe439
--- /dev/null
+++ b/databases/pgsphere/files/patch-polygon.c
@@ -0,0 +1,54 @@
+--- polygon.c.orig	2019-10-30 10:18:38 UTC
++++ polygon.c
+@@ -824,13 +824,21 @@ spherepoly_in(PG_FUNCTION_ARGS)
+ 	nelem = get_path_count();
+ 	if (nelem > 2)
+ 	{
+-		SPoint		arr[nelem];
++		// allocate arr
++		SPoint* arr = (SPoint *)malloc(nelem * sizeof(SPoint));
++		if (arr == NULL) {
++			reset_buffer();
++			elog(ERROR, "spherepoly_in: Could not allocate array.");
++			PG_RETURN_NULL();
++		}
+ 
+ 		for (i = 0; i < nelem; i++)
+ 		{
+ 			get_path_elem(i, &arr[i].lng, &arr[i].lat);
+ 		}
+ 		poly = spherepoly_from_array(&arr[0], nelem);
++		// free allocated array
++		free(arr);
+ 	}
+ 	else
+ 	{
+@@ -892,11 +900,17 @@ spherepoly_area(PG_FUNCTION_ARGS)
+ {
+ 	SPOLY	   *poly = PG_GETARG_SPOLY(0);
+ 	int32		i;
+-	SPoint		s[poly->npts + 2];
++	SPoint     *s = (SPoint*)malloc((poly->npts+2)*sizeof(SPoint));
++	//SPoint		s[poly->npts + 2];
+ 	SPoint		stmp[2];
+ 	SEuler		se;
+ 	float8		sum = 0.0;
+ 
++	if (s == NULL) {
++		elog(ERROR, "spherepoly_area: Could not allocate array.");
++		PG_RETURN_NULL();
++	}
++
+ 	memcpy((void *) &s[1],
+ 		   (void *) &poly->p[0],
+ 		   poly->npts * sizeof(SPoint));
+@@ -935,6 +949,9 @@ spherepoly_area(PG_FUNCTION_ARGS)
+ 	{
+ 		sum = 0.0;
+ 	}
++
++	// free array
++	free(s);
+ 
+ 	PG_RETURN_FLOAT8(sum);
+ }