Revision: 53764
http://brlcad.svn.sourceforge.net/brlcad/?rev=53764&view=rev
Author: brlcad
Date: 2012-11-19 21:01:52 +0000 (Mon, 19 Nov 2012)
Log Message:
-----------
document the function and allow for a null resource pointer
Modified Paths:
--------------
brlcad/trunk/src/librt/prep.c
Modified: brlcad/trunk/src/librt/prep.c
===================================================================
--- brlcad/trunk/src/librt/prep.c 2012-11-19 20:52:24 UTC (rev 53763)
+++ brlcad/trunk/src/librt/prep.c 2012-11-19 21:01:52 UTC (rev 53764)
@@ -832,19 +832,25 @@
}
+/**
+ * returns a bitv zero-initialized with space for least nbits back to
+ * the caller. if a resource pointer is provided, a previously
+ * allocated bitv may be reused or a new one will be allocated.
+ */
struct bu_bitv *
rt_get_solidbitv(size_t nbits, struct resource *resp)
{
struct bu_bitv *solidbits;
int counter=0;
- if (resp->re_solid_bitv.magic != BU_LIST_HEAD_MAGIC) {
+ if (resp && resp->re_solid_bitv.magic != BU_LIST_HEAD_MAGIC) {
bu_bomb("Bad magic number in re_solid_btiv list\n");
}
- if (BU_LIST_IS_EMPTY(&resp->re_solid_bitv)) {
+ if (!resp || BU_LIST_IS_EMPTY(&resp->re_solid_bitv)) {
solidbits = bu_bitv_new((unsigned int)nbits);
} else {
+ /* scan list for a reusable bitv */
for (BU_LIST_FOR(solidbits, bu_bitv, &resp->re_solid_bitv)) {
if (solidbits->nbits >= nbits) {
BU_LIST_DEQUEUE(&solidbits->l);
@@ -853,6 +859,7 @@
}
counter++;
}
+ /* no match, allocate a new one */
if (solidbits == (struct bu_bitv *)&resp->re_solid_bitv) {
solidbits = bu_bitv_new((unsigned int)nbits);
}
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