/*
 * grow.c: generic growing array implementation
 */

#include <syslog.h>

#include "grow.h"
#include "config.h"

struct grow *grow_init(bool dealloc) {
	struct grow *g = malloc(sizeof(struct grow));
	if (g == NULL) {
		syslog(cfg_log_facility | LOG_ERR, "grow: Could not initialize growing array: %m");
		return NULL;
	}
	g -> arr = NULL;
	g -> elems = 0;
	g -> alloc = 0;
	g -> active_elems = 0;
	g -> dealloc = dealloc;
	return g;
}

bool grow_push (void *val, struct grow *g) {
	if (g -> alloc <= g -> elems) {
		uint64_t new_size = g -> alloc == 0? 1 : 2* (g -> alloc);
		void **new_arr = realloc(g -> arr, new_size * sizeof(void *));
		if (new_arr == NULL) {
			syslog(cfg_log_facility | LOG_ERR, "grow: could not resize growinging array: %m");
			return false;
		} else {
			g -> arr = new_arr;
			g -> alloc = new_size;
		}
	}
	g -> arr[g -> elems] = val;
	g -> elems++;
	g -> active_elems++;
	return true;
}

void *grow_pop (struct grow *g) {
	if (g -> elems == 0) {
		return NULL;
	} else {
		g -> elems--;
		g -> active_elems--;
		return g -> arr[g -> elems + 1];
	}
}

void grow_drop (struct grow *g) {
	if (g -> dealloc == true) {
		for(uint64_t i = 0; i < g -> elems; i++) {
			free(g->arr[i]);
		}
	}
	free(g -> arr);
	free(g);
	return;
}