mirror of
https://github.com/u-boot/u-boot.git
synced 2024-12-05 10:33:42 +08:00
232c150a25
add support for USB-based console (enable with "setenv stdout usbtty; setenv stdin usbtty")
111 lines
2.3 KiB
C
111 lines
2.3 KiB
C
/*
|
|
* (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;
|
|
}
|