diff options
Diffstat (limited to 'xorg-server/xkb/XKBGAlloc.c')
| -rw-r--r-- | xorg-server/xkb/XKBGAlloc.c | 64 |
1 files changed, 56 insertions, 8 deletions
diff --git a/xorg-server/xkb/XKBGAlloc.c b/xorg-server/xkb/XKBGAlloc.c index db32dc8c5..ecdca5dd2 100644 --- a/xorg-server/xkb/XKBGAlloc.c +++ b/xorg-server/xkb/XKBGAlloc.c @@ -435,6 +435,57 @@ XkbFreeGeometry(XkbGeometryPtr geom,unsigned which,Bool freeMap) /***====================================================================***/
+/**
+ * Resize and clear an XKB geometry item array. The array size may
+ * grow or shrink unlike in _XkbGeomAlloc.
+ *
+ * @param buffer[in,out] buffer to reallocate and clear
+ * @param szItems[in] currently allocated item count for "buffer"
+ * @param nrItems[in] required item count for "buffer"
+ * @param itemSize[in] size of a single item in "buffer"
+ * @param clearance[in] items to clear after reallocation
+ *
+ * @see _XkbGeomAlloc
+ *
+ * @return TRUE if reallocation succeeded. Otherwise FALSE is returned
+ * and contents of "buffer" aren't touched.
+ */
+Bool
+XkbGeomRealloc(void **buffer, int szItems, int nrItems,
+ int itemSize, XkbGeomClearance clearance)
+{
+ void *items;
+ int clearBegin;
+ /* Check validity of arguments. */
+ if (!buffer)
+ return FALSE;
+ items = *buffer;
+ if (!((items && (szItems > 0)) || (!items && !szItems)))
+ return FALSE;
+ /* Check if there is need to resize. */
+ if (nrItems != szItems)
+ if (!(items = realloc(items, nrItems * itemSize)))
+ return FALSE;
+ /* Clear specified items to zero. */
+ switch (clearance)
+ {
+ case XKB_GEOM_CLEAR_EXCESS:
+ clearBegin = szItems;
+ break;
+ case XKB_GEOM_CLEAR_ALL:
+ clearBegin = 0;
+ break;
+ case XKB_GEOM_CLEAR_NONE:
+ default:
+ clearBegin = nrItems;
+ break;
+ }
+ if (items && (clearBegin < nrItems))
+ memset((char *)items + (clearBegin * itemSize), 0, (nrItems - clearBegin) * itemSize);
+ *buffer = items;
+ return TRUE;
+}
+
static Status
_XkbGeomAlloc( void ** old,
unsigned short * num,
@@ -451,18 +502,15 @@ _XkbGeomAlloc( void ** old, return Success;
*total= (*num)+num_new;
- if ((*old)!=NULL)
- (*old)= realloc((*old),(*total)*sz_elem);
- else (*old)= calloc((*total),sz_elem);
- if ((*old)==NULL) {
+
+ if (!XkbGeomRealloc(old, *num, *total, sz_elem, XKB_GEOM_CLEAR_EXCESS))
+ {
+ free(*old);
+ (*old)= NULL;
*total= *num= 0;
return BadAlloc;
}
- if (*num>0) {
- char *tmp= (char *)(*old);
- memset(&tmp[sz_elem*(*num)], 0, (num_new*sz_elem));
- }
return Success;
}
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