Function msGrowMapLayers

mapfile.c:5119–5158

** Ensure there is at least one free entry in the layers and layerorder ** arrays of this mapObj. Grow the allocated layers/layerorder arrays if ** necessary and allocate a new layer for layers[numlayers] if there is ** not already one, setting its contents to all zero bytes (i.e. does not ** call initLayer() on it). ** ** This function is safe to use for the initial allocation of the layers[]

** Returns a reference to the new layerObj on success, NULL on error.
*/
layerObj *msGrowMapLayers( mapObj *map )
{
    /* Do we need to increase the size of layers/layerorder by 
     * MS_LAYER_ALLOCSIZE?
     */
    if (map->numlayers == map->maxlayers) {
        layerObj **newLayersPtr;
        int *newLayerorderPtr;
        int i, newsize;

        newsize = map->maxlayers + MS_LAYER_ALLOCSIZE;

        /* Alloc/realloc layers */
        newLayersPtr = (layerObj**)realloc(map->layers,
                                           newsize*sizeof(layerObj*));
        MS_CHECK_ALLOC(newLayersPtr, newsize*sizeof(layerObj*), NULL);

        map->layers = newLayersPtr;

        /* Alloc/realloc layerorder */
        newLayerorderPtr = (int *)realloc(map->layerorder,
                                          newsize*sizeof(int));
        MS_CHECK_ALLOC(newLayerorderPtr, newsize*sizeof(int), NULL);
        
        map->layerorder = newLayerorderPtr;

        map->maxlayers = newsize;
        for(i=map->numlayers; i<map->maxlayers; i++) {
            map->layers[i] = NULL;
            map->layerorder[i] = 0;
        }
    }

    if (map->layers[map->numlayers]==NULL) {
        map->layers[map->numlayers]=(layerObj*)calloc(1,sizeof(layerObj));
        MS_CHECK_ALLOC(map->layers[map->numlayers], sizeof(layerObj), NULL);
    }

    return map->layers[map->numlayers];
}


int msFreeLabelCacheSlot(labelCacheSlotObj *cacheslot) {