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/* (C) 2012 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#include <errno.h>
#include <stdarg.h>
#include <uart_cmd.h>
void strbuf_reset(struct strbuf *sb)
{
sb->idx = 0;
memset(sb->buf, 0, sizeof(sb->buf));
}
void strbuf_append(struct strbuf *sb, char ch)
{
if (sb->idx < sizeof(sb->buf)-1)
sb->buf[sb->idx++] = ch;
}
static LLIST_HEAD(cmd_list);
void uart_cmd_register(struct cmd *c)
{
llist_add_tail(&c->list, &cmd_list);
}
void uart_cmd_unregister(struct cmd *c)
{
llist_del(&c->list);
}
void uart_cmds_register(struct cmd *c, unsigned int num)
{
int i;
for (i = 0; i < num; i++)
uart_cmd_register(&c[i]);
}
#define CMD_MAX_ARGS 10
static int handle_cb(struct cmd_state *cs, int op, char *cmd, char *arg)
{
struct cmd *c;
int rc;
char *argv[CMD_MAX_ARGS];
int argc = 0;
if (arg) {
char *tok;
/* tokenize the argument portion into individual arguments */
for (tok = strtok(arg, ","); tok; tok = strtok(NULL, ",")) {
if (argc >= CMD_MAX_ARGS)
break;
argv[argc++] = tok;
}
}
llist_for_each_entry(c, &cmd_list, list) {
if (!strcmp(c->cmd, cmd)) {
if (!(c->ops & op)) {
uart_cmd_out(cs, "Command `%s' doesn't "
"support this operation\n\r", c->cmd);
return -EINVAL;
}
rc = c->cb(cs, op, cmd, argc, argv);
if (rc < 0)
uart_cmd_out(cs, "Error executing command\n\r");
return rc;
}
}
uart_cmd_out(cs, "Unknown command `%s'\n\r", cmd);
return -EINVAL;
}
static void print_list(struct cmd_state *cs)
{
struct cmd *c;
uart_cmd_out(cs, "Supported commands:\r\n");
llist_for_each_entry(c, &cmd_list, list){
const char *help = "";
if (c->help)
help = c->help;
uart_cmd_out(cs, "%s -- %s\n\r", c->cmd, c->help);
}
}
int uart_cmd_char(struct cmd_state *cs, uint8_t ch)
{
int rc;
uart_cmd_out(cs, "%c", ch);
switch (cs->state) {
case ST_IN_CMD:
switch (ch) {
case '=':
cs->state = ST_IN_ARG;
break;
case '?':
uart_cmd_out(cs, "\n\r");
if (cs->cmd.idx == 0)
print_list(cs);
else
rc = handle_cb(cs, CMD_OP_GET, cs->cmd.buf, NULL);
uart_cmd_reset(cs);
break;
case '!':
uart_cmd_out(cs, "\n\r");
rc = handle_cb(cs, CMD_OP_EXEC, cs->cmd.buf, NULL);
uart_cmd_reset(cs);
break;
case ' ':
case '\t':
/* ignore any whitespace */
break;
case '\n':
case '\r':
/* new line always resets buffer */
uart_cmd_reset(cs);
break;
default:
strbuf_append(&cs->cmd, ch);
break;
}
break;
case ST_IN_ARG:
switch (ch) {
case '\r':
uart_cmd_out(cs, "\n");
/* fall through */
case '\n':
rc = handle_cb(cs, CMD_OP_SET, cs->cmd.buf, cs->arg.buf);
uart_cmd_reset(cs);
break;
case ' ':
case '\t':
/* ignore any whitespace */
break;
default:
strbuf_append(&cs->arg, ch);
break;
}
}
if (ch == '\r')
return 1;
return 0;
}
int uart_cmd_out(struct cmd_state *cs, char *format, ...)
{
va_list ap;
va_start(ap, format);
cs->out(format, ap);
va_end(ap);
}
int uart_cmd_reset(struct cmd_state *cs)
{
strbuf_reset(&cs->cmd);
strbuf_reset(&cs->arg);
cs->state = ST_IN_CMD;
uart_cmd_out(cs, "\r\n > ");
return 0;
}
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