133 lines
2.2 KiB
C
133 lines
2.2 KiB
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cescal/ptrbox.h"
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/*
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* Allocate a pointer box entry to be used
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*/
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static struct ptrbox_entry *
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ptrbox_alloc_entry(void)
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{
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struct ptrbox_entry *entry;
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if ((entry = malloc(sizeof(*entry))) == NULL) {
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return NULL;
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}
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entry->data = NULL;
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entry->next = NULL;
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return entry;
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}
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static int
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ptrbox_push_entry(struct ptrbox *ptrbox, struct ptrbox_entry *entry)
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{
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if (ptrbox == NULL || entry == NULL) {
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errno = EINVAL;
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return -1;
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}
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if (ptrbox->head == NULL || ptrbox->tail == NULL) {
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ptrbox->head = entry;
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ptrbox->tail = entry;
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} else {
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ptrbox->head->next = entry;
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ptrbox->head = entry;
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}
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return 0;
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}
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int
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ptrbox_init(struct ptrbox *ptrbox)
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{
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if (ptrbox == NULL) {
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errno = EINVAL;
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return -1;
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}
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ptrbox->head = NULL;
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ptrbox->tail = NULL;
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return 0;
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}
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void *
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ptrbox_alloc(struct ptrbox *ptrbox, size_t len)
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{
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struct ptrbox_entry *entry;
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void *p;
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if (ptrbox == NULL || len == 0) {
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errno = EINVAL;
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return NULL;
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}
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if ((p = malloc(len)) == NULL) {
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return NULL;
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}
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if ((entry = ptrbox_alloc_entry()) == NULL) {
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free(p);
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return NULL;
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}
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entry->data = p;
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if (ptrbox_push_entry(ptrbox, entry) < 0) {
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free(p);
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free(entry);
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return NULL;
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}
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return p;
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}
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char *
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ptrbox_strdup(struct ptrbox *ptrbox, const char *s)
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{
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char *sdup;
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size_t slen;
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if (ptrbox == NULL || s == NULL) {
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errno = EINVAL;
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return NULL;
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}
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slen = strlen(s) + 1;
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if ((sdup = ptrbox_alloc(ptrbox, slen)) == NULL) {
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return NULL;
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}
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memcpy(sdup, s, slen);
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return sdup;
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}
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void
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ptrbox_destroy(struct ptrbox *ptrbox)
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{
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struct ptrbox_entry *entry, *tmp;
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if (ptrbox == NULL) {
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return;
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}
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if ((entry = ptrbox->tail) == NULL) {
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return;
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}
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while (entry != NULL) {
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tmp = entry;
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entry = entry->next;
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free(tmp->data);
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free(tmp);
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}
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}
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