63 lines
1.0 KiB
C
63 lines
1.0 KiB
C
/*
|
|
* Copyright (c) 2026, Chloe M.
|
|
* Provided under the BSD-3 clause
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <stdint.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;
|
|
}
|
|
|
|
memset(tokbuf->buf, 0, sizeof(tokbuf->buf));
|
|
tokbuf->head = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
tokbuf_push(struct tokbuf *tokbuf, struct token *tok)
|
|
{
|
|
if (tokbuf == NULL || tok == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
if ((tokbuf->head++) >= TOKBUF_CAP) {
|
|
tokbuf->head = 0;
|
|
}
|
|
|
|
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;
|
|
}
|