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/*
* Copyright (c) 2026, Chloe M.
* Provided under the BSD-3 clause
*/
#include <sys/types.h>
#include <stdint.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include "cescal/tokbuf.h"
int
tokbuf_init(struct tokbuf *tokbuf)
{
if (tokbuf == NULL) {
errno = EINVAL;
return -1;
}
tokbuf->head = 0;
tokbuf->cap = TOKBUF_CAP;
tokbuf->buf = malloc(sizeof(struct token) * TOKBUF_CAP);
if (tokbuf->buf == NULL) {
return -1;
}
return 0;
}
int
tokbuf_push(struct tokbuf *tokbuf, struct token *tok)
{
void *p;
if (tokbuf == NULL || tok == NULL) {
return -1;
}
if ((tokbuf->head++) >= tokbuf->cap - 1) {
tokbuf->cap += 8;
p = realloc(tokbuf->buf, sizeof(struct token) * tokbuf->cap);
if (tokbuf->buf == NULL) {
return -1;
}
tokbuf->buf = p;
}
tokbuf->buf[tokbuf->head] = *tok;
return 0;
}
int
tokbuf_noff(struct tokbuf *tokbuf, size_t noff, struct token *res)
{
ssize_t off;
if (tokbuf == NULL || res == NULL) {
errno = EINVAL;
return -1;
}
if (noff == 0) {
*res = tokbuf->buf[tokbuf->head + 1];
return 0;
}
if ((off = (tokbuf->head - noff + 1)) < 0) {
off = 0;
}
*res = tokbuf->buf[off];
return 0;
}
void
tokbuf_destroy(struct tokbuf *tokbuf)
{
if (tokbuf == NULL) {
return;
}
if (tokbuf->buf != NULL) {
free(tokbuf->buf);
tokbuf->buf = NULL;
}
}
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