/*
 * Copyright (c) 2026, Apollo Telephone Laboratories.
 * Provided under the BSD-3 clause.
 */

#include <stdlib.h>
#include <string.h>
#include "defconf/ptrbox.h"

static inline void
ptrbox_insert(struct ptrbox *ptrbox, struct ptrbox_entry *entry)
{
    if (ptrbox == NULL || entry == NULL) {
        return;
    }

    TAILQ_INSERT_TAIL(&ptrbox->entries, entry, link);
    ++ptrbox->entry_count;
}

/*
 * Allocate a new pointer box entry
 *
 * @data:  Data to be associated with pointer box entry
 */
static struct ptrbox_entry *
ptrbox_alloc_entry(void *data)
{
    struct ptrbox_entry *entry;

    if (data == NULL) {
        return NULL;
    }

    entry = malloc(sizeof(*entry));
    if (entry == NULL) {
        return NULL;
    }

    entry->data = data;
    return entry;
}

char *
ptrbox_strdup(struct ptrbox *ptrbox, const char *s)
{
    struct ptrbox_entry *entry;
    char *dup;

    if (ptrbox == NULL || s == NULL) {
        return NULL;
    }

    if ((dup = strdup(s)) == NULL) {
        return NULL;
    }

    if ((entry = ptrbox_alloc_entry(dup)) == NULL) {
        free(dup);
        return NULL;
    }

    ptrbox_insert(ptrbox, entry);
    return dup;
}

int
ptrbox_init(struct ptrbox *ptrbox)
{
    if (ptrbox == NULL) {
        return -1;
    }

    TAILQ_INIT(&ptrbox->entries);
    ptrbox->entry_count = 0;
    return 0;
}

void
ptrbox_destroy(struct ptrbox *ptrbox)
{
    struct ptrbox_entry *entry, *tmp;

    if (ptrbox == NULL) {
        return;
    }

    entry = TAILQ_FIRST(&ptrbox->entries);
    while (entry != NULL) {
        if (entry->data != NULL) {
            free(entry->data);
        }

        tmp = entry;
        entry = TAILQ_NEXT(entry, link);
        free(tmp);
    }
}