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- /*
- * (C) Copyright 2003
- * Gerry Hamel, geh@ti.com, Texas Instruments
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
- #include <common.h>
- #include <malloc.h>
- #include <circbuf.h>
- int buf_init (circbuf_t * buf, unsigned int size)
- {
- assert (buf != NULL);
- buf->size = 0;
- buf->totalsize = size;
- buf->data = (char *) malloc (sizeof (char) * size);
- assert (buf->data != NULL);
- buf->top = buf->data;
- buf->tail = buf->data;
- buf->end = &(buf->data[size]);
- return 1;
- }
- int buf_free (circbuf_t * buf)
- {
- assert (buf != NULL);
- assert (buf->data != NULL);
- free (buf->data);
- memset (buf, 0, sizeof (circbuf_t));
- return 1;
- }
- int buf_pop (circbuf_t * buf, char *dest, unsigned int len)
- {
- unsigned int i;
- char *p = buf->top;
- assert (buf != NULL);
- assert (dest != NULL);
- /* Cap to number of bytes in buffer */
- if (len > buf->size)
- len = buf->size;
- for (i = 0; i < len; i++) {
- dest[i] = *p++;
- /* Bounds check. */
- if (p == buf->end) {
- p = buf->data;
- }
- }
- /* Update 'top' pointer */
- buf->top = p;
- buf->size -= len;
- return len;
- }
- int buf_push (circbuf_t * buf, const char *src, unsigned int len)
- {
- /* NOTE: this function allows push to overwrite old data. */
- unsigned int i;
- char *p = buf->tail;
- assert (buf != NULL);
- assert (src != NULL);
- for (i = 0; i < len; i++) {
- *p++ = src[i];
- if (p == buf->end) {
- p = buf->data;
- }
- /* Make sure pushing too much data just replaces old data */
- if (buf->size < buf->totalsize) {
- buf->size++;
- } else {
- buf->top++;
- if (buf->top == buf->end) {
- buf->top = buf->data;
- }
- }
- }
- /* Update 'tail' pointer */
- buf->tail = p;
- return len;
- }
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