/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Add to readline cmdline-editing by
* (C) Copyright 2005
* JinHua Luo, GuangDong Linux Center,
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
/* #define DEBUG */
#include
#include
#include
#ifdef CONFIG_MODEM_SUPPORT
#include /* for free() prototype */
#endif
#ifdef CONFIG_SYS_HUSH_PARSER
#include
#endif
#include
#if defined(CONFIG_SILENT_CONSOLE) || defined(CONFIG_POST) || defined(CONFIG_CMDLINE_EDITING)
DECLARE_GLOBAL_DATA_PTR;
#endif
/*
* Board-specific Platform code can reimplement show_boot_progress () if needed
*/
void inline __show_boot_progress (int val) {}
void show_boot_progress (int val) __attribute__((weak, alias("__show_boot_progress")));
#if defined(CONFIG_BOOT_RETRY_TIME) && defined(CONFIG_RESET_TO_RETRY)
extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); /* for do_reset() prototype */
#endif
extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
#if defined(CONFIG_UPDATE_TFTP)
void update_tftp (void);
#endif /* CONFIG_UPDATE_TFTP */
#define MAX_DELAY_STOP_STR 32
#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
static int abortboot(int);
#endif
#undef DEBUG_PARSER
char console_buffer[CONFIG_SYS_CBSIZE]; /* console I/O buffer */
static char * delete_char (char *buffer, char *p, int *colp, int *np, int plen);
static char erase_seq[] = "\b \b"; /* erase sequence */
static char tab_seq[] = " "; /* used to expand TABs */
#ifdef CONFIG_BOOT_RETRY_TIME
static uint64_t endtime = 0; /* must be set, default is instant timeout */
static int retry_time = -1; /* -1 so can call readline before main_loop */
#endif
#define endtick(seconds) (get_ticks() + (uint64_t)(seconds) * get_tbclk())
#ifndef CONFIG_BOOT_RETRY_MIN
#define CONFIG_BOOT_RETRY_MIN CONFIG_BOOT_RETRY_TIME
#endif
#ifdef CONFIG_MODEM_SUPPORT
int do_mdm_init = 0;
extern void mdm_init(void); /* defined in board.c */
#endif
/***************************************************************************
* Watch for 'delay' seconds for autoboot stop or autoboot delay string.
* returns: 0 - no key string, allow autoboot
* 1 - got key string, abort
*/
#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
# if defined(CONFIG_AUTOBOOT_KEYED) //未定义
static __inline__ int abortboot(int bootdelay)
{
int abort = 0;
uint64_t etime = endtick(bootdelay);
struct {
char* str;
u_int len;
int retry;
}
delaykey [] = {
{ str: getenv ("bootdelaykey"), retry: 1 },
{ str: getenv ("bootdelaykey2"), retry: 1 },
{ str: getenv ("bootstopkey"), retry: 0 },
{ str: getenv ("bootstopkey2"), retry: 0 },
};
char presskey [MAX_DELAY_STOP_STR];
u_int presskey_len = 0;
u_int presskey_max = 0;
u_int i;
# ifdef CONFIG_AUTOBOOT_PROMPT
printf(CONFIG_AUTOBOOT_PROMPT);
# endif
# ifdef CONFIG_AUTOBOOT_DELAY_STR
if (delaykey[0].str == NULL)
delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR;
# endif
# ifdef CONFIG_AUTOBOOT_DELAY_STR2
if (delaykey[1].str == NULL)
delaykey[1].str = CONFIG_AUTOBOOT_DELAY_STR2;
# endif
# ifdef CONFIG_AUTOBOOT_STOP_STR
if (delaykey[2].str == NULL)
delaykey[2].str = CONFIG_AUTOBOOT_STOP_STR;
# endif
# ifdef CONFIG_AUTOBOOT_STOP_STR2
if (delaykey[3].str == NULL)
delaykey[3].str = CONFIG_AUTOBOOT_STOP_STR2;
# endif
for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i ++) {
delaykey[i].len = delaykey[i].str == NULL ?
0 : strlen (delaykey[i].str);
delaykey[i].len = delaykey[i].len > MAX_DELAY_STOP_STR ?
MAX_DELAY_STOP_STR : delaykey[i].len;
presskey_max = presskey_max > delaykey[i].len ?
presskey_max : delaykey[i].len;
# if DEBUG_BOOTKEYS
printf("%s key:<%s>\n",
delaykey[i].retry ? "delay" : "stop",
delaykey[i].str ? delaykey[i].str : "NULL");
# endif
}
/* In order to keep up with incoming data, check timeout only
* when catch up.
*/
do {
if (tstc()) {
if (presskey_len < presskey_max) {
presskey [presskey_len ++] = getc();
}
else {
for (i = 0; i < presskey_max - 1; i ++)
presskey [i] = presskey [i + 1];
presskey [i] = getc();
}
}
for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i ++) {
if (delaykey[i].len > 0 &&
presskey_len >= delaykey[i].len &&
memcmp (presskey + presskey_len - delaykey[i].len,
delaykey[i].str,
delaykey[i].len) == 0) {
# if DEBUG_BOOTKEYS
printf("got %skey\n",
delaykey[i].retry ? "delay" : "stop");
# endif
# ifdef CONFIG_BOOT_RETRY_TIME
/* don't retry auto boot */
if (! delaykey[i].retry)
retry_time = -1;
# endif
abort = 1;
}
}
} while (!abort && get_ticks() <= etime);
# if DEBUG_BOOTKEYS
if (!abort)
puts("key timeout\n");
# endif
#ifdef CONFIG_SILENT_CONSOLE
if (abort)
gd->flags &= ~GD_FLG_SILENT;
#endif
return abort;
}
# else /* !defined(CONFIG_AUTOBOOT_KEYED) */
#ifdef CONFIG_MENUKEY
static int menukey = 0;
#endif
//判断在指定的时间内用户是否终止引导
static __inline__ int abortboot(int bootdelay)
{
int abort = 0;
#ifdef CONFIG_MENUPROMPT //未定义
printf(CONFIG_MENUPROMPT);
#else
printf("Hit any key to stop autoboot: %2d ", bootdelay);
#endif
#if defined CONFIG_ZERO_BOOTDELAY_CHECK //未定义 检查是否有按键按下
/*
* Check if key already pressed
* Don't check if bootdelay < 0
*/
if (bootdelay >= 0) {
if (tstc()) { /* we got a key press */
(void) getc(); /* consume input */
puts ("\b\b\b 0");
abort = 1; /* don't auto boot */
}
}
#endif
//检查是否有按键按下的循环
while ((bootdelay > 0) && (!abort)) { //如果延时未到且未选择终止
int i;
--bootdelay;
/* delay 100 * 10ms */
for (i=0; !abort && i<100; ++i) {
if (tstc()) { /* we got a key press *///有按键按下
abort = 1; /* don't auto boot */ //引导终止
bootdelay = 0; /* no more delay *///延时计数清零
# ifdef CONFIG_MENUKEY
menukey = getc();
# else
(void) getc(); /* consume input */ //清空输入缓冲
# endif
break;
}
udelay(10000);
}
printf ("\b\b\b%2d ", bootdelay);//打印剩余时间
}
putc('\n');
#ifdef CONFIG_SILENT_CONSOLE//未定义
if (abort)
gd->flags &= ~GD_FLG_SILENT;
#endif
return abort;
}
# endif /* CONFIG_AUTOBOOT_KEYED */
#endif /* CONFIG_BOOTDELAY >= 0 */
/****************************************************************************/
void main_loop (void)
{
//L306--L468的编译开关基本上没定义
#ifndef CONFIG_SYS_HUSH_PARSER//定义一些变量
static char lastcommand[CONFIG_SYS_CBSIZE] = { 0, };
int len;
int rc = 1;
int flag;
#endif
#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0) //有定义；自启动的秒数
char *s;
int bootdelay;
#endif
#ifdef CONFIG_PREBOOT //没定义
char *p;
#endif
#ifdef CONFIG_BOOTCOUNT_LIMIT //没定义
unsigned long bootcount = 0;
unsigned long bootlimit = 0;
char *bcs;
char bcs_set[16];
#endif /* CONFIG_BOOTCOUNT_LIMIT */
#if defined(CONFIG_VFD) && defined(VFD_TEST_LOGO) //没定义
ulong bmp = 0; /* default bitmap */
extern int trab_vfd (ulong bitmap);
#ifdef CONFIG_MODEM_SUPPORT //没定义
if (do_mdm_init)
bmp = 1; /* alternate bitmap */
#endif
trab_vfd (bmp);
#endif /* CONFIG_VFD && VFD_TEST_LOGO */
#ifdef CONFIG_BOOTCOUNT_LIMIT //没定义
bootcount = bootcount_load();
bootcount++;
bootcount_store (bootcount);
sprintf (bcs_set, "%lu", bootcount);
setenv ("bootcount", bcs_set);
bcs = getenv ("bootlimit");
bootlimit = bcs ? simple_strtoul (bcs, NULL, 10) : 0;
#endif /* CONFIG_BOOTCOUNT_LIMIT */
#ifdef CONFIG_MODEM_SUPPORT //没定义
debug ("DEBUG: main_loop: do_mdm_init=%d\n", do_mdm_init);
if (do_mdm_init) {
char *str = strdup(getenv("mdm_cmd"));
setenv ("preboot", str); /* set or delete definition */
if (str != NULL)
free (str);
mdm_init(); /* wait for modem connection */
}
#endif /* CONFIG_MODEM_SUPPORT */
#ifdef CONFIG_VERSION_VARIABLE //没定义
{
extern char version_string[];
setenv ("ver", version_string); /* set version variable */
}
#endif /* CONFIG_VERSION_VARIABLE */
#ifdef CFG_HUSH_PARSER //没定义
u_boot_hush_start ();
#endif
#if defined(CONFIG_HUSH_INIT_VAR)
hush_init_var ();
#endif
#ifdef CONFIG_AUTO_COMPLETE //没定义
install_auto_complete();
#endif
#ifdef CONFIG_PREBOOT //没定义
if ((p = getenv ("preboot")) != NULL) {
# ifdef CONFIG_AUTOBOOT_KEYED
int prev = disable_ctrlc(1); /* disable Control C checking */
# endif
# ifndef CONFIG_SYS_HUSH_PARSER
run_command (p, 0);
# else
parse_string_outer(p, FLAG_PARSE_SEMICOLON |
FLAG_EXIT_FROM_LOOP);
# endif
# ifdef CONFIG_AUTOBOOT_KEYED
disable_ctrlc(prev); /* restore Control C checking */
# endif
}
#endif /* CONFIG_PREBOOT */
#if defined(CONFIG_UPDATE_TFTP)
update_tftp ();
#endif /* CONFIG_UPDATE_TFTP */
//获得就是Uboot启动后多久进入内核。
#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0) //获得延时时长
s = getenv ("bootdelay");
bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;
debug ("### main_loop entered: bootdelay=%d\n\n", bootdelay);
# ifdef CONFIG_BOOT_RETRY_TIME //没定义
init_cmd_timeout ();
# endif /* CONFIG_BOOT_RETRY_TIME */
#ifdef CONFIG_POST
if (gd->flags & GD_FLG_POSTFAIL) {
s = getenv("failbootcmd");
}
else
#endif /* CONFIG_POST */
#ifdef CONFIG_BOOTCOUNT_LIMIT //没定义
if (bootlimit && (bootcount > bootlimit)) {
printf ("Warning: Bootlimit (%u) exceeded. Using altbootcmd.\n",
(unsigned)bootlimit);
s = getenv ("altbootcmd");
}
else
#endif /* CONFIG_BOOTCOUNT_LIMIT */
s = getenv ("bootcmd"); // 1、读预先设置的环境变量命令
debug ("### main_loop: bootcmd=\"%s\"\n", s ? s : "");
if (bootdelay >= 0 && s && !abortboot (bootdelay)) {
//abortboot()有键按下返回1，不执行，无键按下执行启动内核
//若延时期间用户没终止程序，即上面粗体字函数abortboot (bootdelay)
// 返回0，
//则不会进入命令行模式，直接运行bootcmd
# ifdef CONFIG_AUTOBOOT_KEYED //没定义
int prev = disable_ctrlc(1); /* disable Control C checking */
# endif
# ifndef CFG_HUSH_PARSER //没定义，执行
run_command (s, 0); // 2、没有键按下，执行预先设置的命令
//s = getenv ("bootcmd"); // 1、读预先设置的环境变量命令
# else
parse_string_outer(s, FLAG_PARSE_SEMICOLON |
FLAG_EXIT_FROM_LOOP);
# endif
# ifdef CONFIG_AUTOBOOT_KEYED // 没定义
disable_ctrlc(prev); /* restore Control C checking */
# endif
}
//for 语句的结束
//有键按下到控制台
# ifdef CONFIG_MENUKEY //没定义
if (menukey == CONFIG_MENUKEY) {
s = getenv("menucmd");
if (s) {
# ifndef CONFIG_SYS_HUSH_PARSER
run_command (s, 0);
# else
parse_string_outer(s, FLAG_PARSE_SEMICOLON |
FLAG_EXIT_FROM_LOOP);
# endif
}
}
#endif /* CONFIG_MENUKEY */
#endif /* CONFIG_BOOTDELAY */
#ifdef CONFIG_AMIGAONEG3SE //没定义
{
extern void video_banner(void);
video_banner();
}
#endif
/*
* Main Loop for Monitor Command Processing
*/
#ifdef CFG_HUSH_PARSER // 没定义
parse_file_outer();
/* This point is never reached */
for (;;);
#else
for (;;) { // 3、死循环，等待用户输入
#ifdef CONFIG_BOOT_RETRY_TIME // 有定义，执行
if (rc >= 0) {
/* Saw enough of a valid command to
* restart the timeout.
*/
reset_cmd_timeout();//设置一个时间，多久没键按下将重启我们系统
}
#endif
// 4、打印提示符GEC2440#: 并且打印输入的命令。LEN>0,正常输入
len = readline (CONFIG_SYS_PROMPT);//读键盘的输入
flag = 0; /* assume no special flags for now */
if (len > 0) // 5、有字串输入
strcpy (lastcommand, console_buffer); // 6 、把命令拷贝进来
else if (len == 0)
flag |= CMD_FLAG_REPEAT;
#ifdef CONFIG_BOOT_RETRY_TIME // 没定义
else if (len == -2) {
/* -2 means timed out, retry autoboot
*/
puts ("\nTimed out waiting for command\n");
# ifdef CONFIG_RESET_TO_RETRY // 没定义
/* Reinit board to run initialization code again */
do_reset (NULL, 0, 0, NULL);
# else
return; /* retry autoboot */
# endif
}
#endif
if (len == -1)
puts ("\n");
else
rc = run_command (lastcommand, flag); // 7、这里执行命令
if (rc <= 0) {
/* invalid command or not repeatable, forget it */
lastcommand[0] = 0;
}
}
#endif /*CONFIG_SYS_HUSH_PARSER*/
}
#ifdef CONFIG_BOOT_RETRY_TIME
/***************************************************************************
* initialize command line timeout
*/
void init_cmd_timeout(void)
{
char *s = getenv ("bootretry");
if (s != NULL)
retry_time = (int)simple_strtol(s, NULL, 10);
else
retry_time = CONFIG_BOOT_RETRY_TIME;
if (retry_time >= 0 && retry_time < CONFIG_BOOT_RETRY_MIN)
retry_time = CONFIG_BOOT_RETRY_MIN;
}
/***************************************************************************
* reset command line timeout to retry_time seconds
*/
void reset_cmd_timeout(void)
{
endtime = endtick(retry_time);
}
#endif
#ifdef CONFIG_CMDLINE_EDITING
/*
* cmdline-editing related codes from vivi.
* Author: Janghoon Lyu
*/
#define putnstr(str,n) do { \
printf ("%.*s", (int)n, str); \
} while (0)
#define CTL_CH(c) ((c) - 'a' + 1)
#define MAX_CMDBUF_SIZE 256
#define CTL_BACKSPACE ('\b')
#define DEL ((char)255)
#define DEL7 ((char)127)
#define CREAD_HIST_CHAR ('!')
#define getcmd_putch(ch) putc(ch)
#define getcmd_getch() getc()
#define getcmd_cbeep() getcmd_putch('\a')
#define HIST_MAX 20
#define HIST_SIZE MAX_CMDBUF_SIZE
static int hist_max = 0;
static int hist_add_idx = 0;
static int hist_cur = -1;
unsigned hist_num = 0;
char* hist_list[HIST_MAX];
char hist_lines[HIST_MAX][HIST_SIZE];
#define add_idx_minus_one() ((hist_add_idx == 0) ? hist_max : hist_add_idx-1)
static void hist_init(void)
{
int i;
hist_max = 0;
hist_add_idx = 0;
hist_cur = -1;
hist_num = 0;
for (i = 0; i < HIST_MAX; i++) {
hist_list[i] = hist_lines[i];
hist_list[i][0] = '\0';
}
}
static void cread_add_to_hist(char *line)
{
strcpy(hist_list[hist_add_idx], line);
if (++hist_add_idx >= HIST_MAX)
hist_add_idx = 0;
if (hist_add_idx > hist_max)
hist_max = hist_add_idx;
hist_num++;
}
static char* hist_prev(void)
{
char *ret;
int old_cur;
if (hist_cur < 0)
return NULL;
old_cur = hist_cur;
if (--hist_cur < 0)
hist_cur = hist_max;
if (hist_cur == hist_add_idx) {
hist_cur = old_cur;
ret = NULL;
} else
ret = hist_list[hist_cur];
return (ret);
}
static char* hist_next(void)
{
char *ret;
if (hist_cur < 0)
return NULL;
if (hist_cur == hist_add_idx)
return NULL;
if (++hist_cur > hist_max)
hist_cur = 0;
if (hist_cur == hist_add_idx) {
ret = "";
} else
ret = hist_list[hist_cur];
return (ret);
}
#ifndef CONFIG_CMDLINE_EDITING
static void cread_print_hist_list(void)
{
int i;
unsigned long n;
n = hist_num - hist_max;
i = hist_add_idx + 1;
while (1) {
if (i > hist_max)
i = 0;
if (i == hist_add_idx)
break;
printf("%s\n", hist_list[i]);
n++;
i++;
}
}
#endif /* CONFIG_CMDLINE_EDITING */
#define BEGINNING_OF_LINE() { \
while (num) { \
getcmd_putch(CTL_BACKSPACE); \
num--; \
} \
}
#define ERASE_TO_EOL() { \
if (num < eol_num) { \
int tmp; \
for (tmp = num; tmp < eol_num; tmp++) \
getcmd_putch(' '); \
while (tmp-- > num) \
getcmd_putch(CTL_BACKSPACE); \
eol_num = num; \
} \
}
#define REFRESH_TO_EOL() { \
if (num < eol_num) { \
wlen = eol_num - num; \
putnstr(buf + num, wlen); \
num = eol_num; \
} \
}
static void cread_add_char(char ichar, int insert, unsigned long *num,
unsigned long *eol_num, char *buf, unsigned long len)
{
unsigned long wlen;
/* room ??? */
if (insert || *num == *eol_num) {
if (*eol_num > len - 1) {
getcmd_cbeep();
return;
}
(*eol_num)++;
}
if (insert) {
wlen = *eol_num - *num;
if (wlen > 1) {
memmove(&buf[*num+1], &buf[*num], wlen-1);
}
buf[*num] = ichar;
putnstr(buf + *num, wlen);
(*num)++;
while (--wlen) {
getcmd_putch(CTL_BACKSPACE);
}
} else {
/* echo the character */
wlen = 1;
buf[*num] = ichar;
putnstr(buf + *num, wlen);
(*num)++;
}
}
static void cread_add_str(char *str, int strsize, int insert, unsigned long *num,
unsigned long *eol_num, char *buf, unsigned long len)
{
while (strsize--) {
cread_add_char(*str, insert, num, eol_num, buf, len);
str++;
}
}
static int cread_line(const char *const prompt, char *buf, unsigned int *len)
{
unsigned long num = 0;
unsigned long eol_num = 0;
unsigned long wlen;
char ichar;
int insert = 1;
int esc_len = 0;
char esc_save[8];
int init_len = strlen(buf);
if (init_len)
cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len);
while (1) {
#ifdef CONFIG_BOOT_RETRY_TIME
while (!tstc()) { /* while no incoming data */
if (retry_time >= 0 && get_ticks() > endtime)
return (-2); /* timed out */
}
#endif
ichar = getcmd_getch();
if ((ichar == '\n') || (ichar == '\r')) {
putc('\n');
break;
}
/*
* handle standard linux xterm esc sequences for arrow key, etc.
*/
if (esc_len != 0) {
if (esc_len == 1) {
if (ichar == '[') {
esc_save[esc_len] = ichar;
esc_len = 2;
} else {
cread_add_str(esc_save, esc_len, insert,
&num, &eol_num, buf, *len);
esc_len = 0;
}
continue;
}
switch (ichar) {
case 'D': /* <- key */
ichar = CTL_CH('b');
esc_len = 0;
break;
case 'C': /* -> key */
ichar = CTL_CH('f');
esc_len = 0;
break; /* pass off to ^F handler */
case 'H': /* Home key */
ichar = CTL_CH('a');
esc_len = 0;
break; /* pass off to ^A handler */
case 'A': /* up arrow */
ichar = CTL_CH('p');
esc_len = 0;
break; /* pass off to ^P handler */
case 'B': /* down arrow */
ichar = CTL_CH('n');
esc_len = 0;
break; /* pass off to ^N handler */
default:
esc_save[esc_len++] = ichar;
cread_add_str(esc_save, esc_len, insert,
&num, &eol_num, buf, *len);
esc_len = 0;
continue;
}
}
switch (ichar) {
case 0x1b:
if (esc_len == 0) {
esc_save[esc_len] = ichar;
esc_len = 1;
} else {
puts("impossible condition #876\n");
esc_len = 0;
}
break;
case CTL_CH('a'):
BEGINNING_OF_LINE();
break;
case CTL_CH('c'): /* ^C - break */
*buf = '\0'; /* discard input */
return (-1);
case CTL_CH('f'):
if (num < eol_num) {
getcmd_putch(buf[num]);
num++;
}
break;
case CTL_CH('b'):
if (num) {
getcmd_putch(CTL_BACKSPACE);
num--;
}
break;
case CTL_CH('d'):
if (num < eol_num) {
wlen = eol_num - num - 1;
if (wlen) {
memmove(&buf[num], &buf[num+1], wlen);
putnstr(buf + num, wlen);
}
getcmd_putch(' ');
do {
getcmd_putch(CTL_BACKSPACE);
} while (wlen--);
eol_num--;
}
break;
case CTL_CH('k'):
ERASE_TO_EOL();
break;
case CTL_CH('e'):
REFRESH_TO_EOL();
break;
case CTL_CH('o'):
insert = !insert;
break;
case CTL_CH('x'):
case CTL_CH('u'):
BEGINNING_OF_LINE();
ERASE_TO_EOL();
break;
case DEL:
case DEL7:
case 8:
if (num) {
wlen = eol_num - num;
num--;
memmove(&buf[num], &buf[num+1], wlen);
getcmd_putch(CTL_BACKSPACE);
putnstr(buf + num, wlen);
getcmd_putch(' ');
do {
getcmd_putch(CTL_BACKSPACE);
} while (wlen--);
eol_num--;
}
break;
case CTL_CH('p'):
case CTL_CH('n'):
{
char * hline;
esc_len = 0;
if (ichar == CTL_CH('p'))
hline = hist_prev();
else
hline = hist_next();
if (!hline) {
getcmd_cbeep();
continue;
}
/* nuke the current line */
/* first, go home */
BEGINNING_OF_LINE();
/* erase to end of line */
ERASE_TO_EOL();
/* copy new line into place and display */
strcpy(buf, hline);
eol_num = strlen(buf);
REFRESH_TO_EOL();
continue;
}
#ifdef CONFIG_AUTO_COMPLETE
case '\t': {
int num2, col;
/* do not autocomplete when in the middle */
if (num < eol_num) {
getcmd_cbeep();
break;
}
buf[num] = '\0';
col = strlen(prompt) + eol_num;
num2 = num;
if (cmd_auto_complete(prompt, buf, &num2, &col)) {
col = num2 - num;
num += col;
eol_num += col;
}
break;
}
#endif
default:
cread_add_char(ichar, insert, &num, &eol_num, buf, *len);
break;
}
}
*len = eol_num;
buf[eol_num] = '\0'; /* lose the newline */
if (buf[0] && buf[0] != CREAD_HIST_CHAR)
cread_add_to_hist(buf);
hist_cur = hist_add_idx;
return 0;
}
#endif /* CONFIG_CMDLINE_EDITING */
/****************************************************************************/
/*
* Prompt for input and read a line.
* If CONFIG_BOOT_RETRY_TIME is defined and retry_time >= 0,
* time out when time goes past endtime (timebase time in ticks).
* Return: number of read characters
* -1 if break
* -2 if timed out
*/
//提示用户输入，然后一直等待用户输入，指到用户输入完成,
//然后获取用户数据，并存入全局变量console_buffer中。
int readline (const char *const prompt)
{
/*
* If console_buffer isn't 0-length the user will be prompted to modify
* it instead of entering it from scratch as desired.
*/
console_buffer[0] = '\0';
return readline_into_buffer(prompt, console_buffer);
}
int readline_into_buffer (const char *const prompt, char * buffer)
{
char *p = buffer;
#ifdef CONFIG_CMDLINE_EDITING
unsigned int len=MAX_CMDBUF_SIZE;
int rc;
static int initted = 0;
/*
* History uses a global array which is not
* writable until after relocation to RAM.
* Revert to non-history version if still
* running from flash.
*/
if (gd->flags & GD_FLG_RELOC) {
if (!initted) {
hist_init();
initted = 1;
}
if (prompt)
puts (prompt);
rc = cread_line(prompt, p, &len);
return rc < 0 ? rc : len;
} else {
#endif /* CONFIG_CMDLINE_EDITING */
char * p_buf = p;
int n = 0; /* buffer index */
int plen = 0; /* prompt length */
int col; /* output column cnt */
char c;
/* print prompt */
if (prompt) {
plen = strlen (prompt);
puts (prompt); // 1 打印提示符
}
col = plen;
for (;;) { // 2 等待输入命令
#ifdef CONFIG_BOOT_RETRY_TIME //没定义
while (!tstc()) { /* while no incoming data */
if (retry_time >= 0 && get_ticks() > endtime)
return (-2); /* timed out */
}
#endif
WATCHDOG_RESET(); /* Trigger watchdog, if needed */
#ifdef CONFIG_SHOW_ACTIVITY //没定义
while (!tstc()) {
extern void show_activity(int arg);
show_activity(0);
}
#endif
c = getc(); // 3 接受输入的命令
/*
* Special character handling
*/
switch (c) { // 4 键盘输入处理不同的字符
case '\r': /* Enter */
case '\n':
*p = '\0';
puts ("\r\n");
return (p - p_buf);
case '\0': /* nul 忽略，继续*/
continue;
case 0x03: /* ^C - break */
p_buf[0] = '\0'; /* discard input */
return (-1);
case 0x15: /* ^U - erase line 删除*/
while (col > plen) {
puts (erase_seq);
--col;
}
p = p_buf;
n = 0;
continue;
case 0x17: /* ^W - erase word 删除*/
p=delete_char(p_buf, p, &col, &n, plen);
while ((n > 0) && (*p != ' ')) {
p=delete_char(p_buf, p, &col, &n, plen);
}
continue;
case 0x08: /* ^H - backspace */
case 0x7F: /* DEL - backspace 删除*/
p=delete_char(p_buf, p, &col, &n, plen);
continue;
default:
/*
* Must be a normal character then
*/
if (n < CONFIG_SYS_CBSIZE-2) {
if (c == '\t') { /* expand TABs 自动补齐 */
#ifdef CONFIG_AUTO_COMPLETE // 没定义
/* if auto completion triggered just continue */
/*自动补全功能，熟悉linux的肯定知道*/
*p = '\0';
if (cmd_auto_complete(prompt, console_buffer, &n, &col)) {
p = p_buf + n; /* reset */
continue;
}
#endif
puts (tab_seq+(col&07));
col += 8 - (col&07);
} else {
++col; /* echo input */
putc (c);
}
*p++ = c; ;/*把字符保存在buffer中*/
++n;
} else { /* Buffer full */
putc ('\a');//表示蜂鸣器响
}
}
}
#ifdef CONFIG_CMDLINE_EDITING
}
#endif
}
/****************************************************************************/
static char * delete_char (char *buffer, char *p, int *colp, int *np, int plen)
{
char *s;
if (*np == 0) {
return (p);
}
if (*(--p) == '\t') { /* will retype the whole line */
while (*colp > plen) {
puts (erase_seq);
(*colp)--;
}
for (s=buffer; s
if (*s == '\t') {
puts (tab_seq+((*colp) & 07));
*colp += 8 - ((*colp) & 07);
} else {
++(*colp);
putc (*s);
}
}
} else {
puts (erase_seq);
(*colp)--;
}
(*np)--;
return (p);
}
/****************************************************************************/
int parse_line (char *line, char *argv[])
{
int nargs = 0;
#ifdef DEBUG_PARSER
printf ("parse_line: \"%s\"\n", line);
#endif
while (nargs < CONFIG_SYS_MAXARGS) {
/* skip any white space */
while ((*line == ' ') || (*line == '\t')) {
++line;
}
if (*line == '\0') { /* end of line, no more args */
argv[nargs] = NULL;
#ifdef DEBUG_PARSER
printf ("parse_line: nargs=%d\n", nargs);
#endif
return (nargs);
}
argv[nargs++] = line; /* begin of argument string */
/* find end of string */
while (*line && (*line != ' ') && (*line != '\t')) {
++line;
}
if (*line == '\0') { /* end of line, no more args */
argv[nargs] = NULL;
#ifdef DEBUG_PARSER
printf ("parse_line: nargs=%d\n", nargs);
#endif
return (nargs);
}
*line++ = '\0'; /* terminate current arg */
}
printf ("** Too many args (max. %d) **\n", CONFIG_SYS_MAXARGS);
#ifdef DEBUG_PARSER
printf ("parse_line: nargs=%d\n", nargs);
#endif
return (nargs);
}
/****************************************************************************/
static void process_macros (const char *input, char *output)
{
char c, prev;
const char *varname_start = NULL;
int inputcnt = strlen (input);
int outputcnt = CONFIG_SYS_CBSIZE;
int state = 0; /* 0 = waiting for '$' */
/* 1 = waiting for '(' or '{' */
/* 2 = waiting for ')' or '}' */
/* 3 = waiting for ''' */
#ifdef DEBUG_PARSER
char *output_start = output;
printf ("[PROCESS_MACROS] INPUT len %d: \"%s\"\n", strlen (input),
input);
#endif
prev = '\0'; /* previous character */
while (inputcnt && outputcnt) {
c = *input++;
inputcnt--;
if (state != 3) {
/* remove one level of escape characters */
if ((c == '\\') && (prev != '\\')) {
if (inputcnt-- == 0)
break;
prev = c;
c = *input++;
}
}
switch (state) {
case 0: /* Waiting for (unescaped) $ */
if ((c == '\'') && (prev != '\\')) {
state = 3;
break;
}
if ((c == '$') && (prev != '\\')) {
state++;
} else {
*(output++) = c;
outputcnt--;
}
break;
case 1: /* Waiting for ( */
if (c == '(' || c == '{') {
state++;
varname_start = input;
} else {
state = 0;
*(output++) = '$';
outputcnt--;
if (outputcnt) {
*(output++) = c;
outputcnt--;
}
}
break;
case 2: /* Waiting for ) */
if (c == ')' || c == '}') {
int i;
char envname[CONFIG_SYS_CBSIZE], *envval;
int envcnt = input - varname_start - 1; /* Varname # of chars */
/* Get the varname */
for (i = 0; i < envcnt; i++) {
envname[i] = varname_start[i];
}
envname[i] = 0;
/* Get its value */
envval = getenv (envname);
/* Copy into the line if it exists */
if (envval != NULL)
while ((*envval) && outputcnt) {
*(output++) = *(envval++);
outputcnt--;
}
/* Look for another '$' */
state = 0;
}
break;
case 3: /* Waiting for ' */
if ((c == '\'') && (prev != '\\')) {
state = 0;
} else {
*(output++) = c;
outputcnt--;
}
break;
}
prev = c;
}
if (outputcnt)
*output = 0;
else
*(output - 1) = 0;
#ifdef DEBUG_PARSER
printf ("[PROCESS_MACROS] OUTPUT len %d: \"%s\"\n",
strlen (output_start), output_start);
#endif
}
/****************************************************************************
* returns:
* 1 - command executed, repeatable
* 0 - command executed but not repeatable, interrupted commands are
* always considered not repeatable
* -1 - not executed (unrecognized, bootd recursion or too many args)
* (If cmd is NULL or "" or longer than CONFIG_SYS_CBSIZE-1 it is
* considered unrecognized)
*
* WARNING:
*
* We must create a temporary copy of the command since the command we get
* may be the result from getenv(), which returns a pointer directly to
* the environment data, which may change magicly when the command we run
* creates or modifies environment variables (like "bootp" does).
*/
int run_command (const char *cmd, int flag) //saveenv
{
cmd_tbl_t *cmdtp;
char cmdbuf[CONFIG_SYS_CBSIZE]; /* working copy of cmd */
char *token; /* start of token in cmdbuf */
char *sep; /* end of token (separator) in cmdbuf */
char finaltoken[CONFIG_SYS_CBSIZE];
char *str = cmdbuf;
char *argv[CONFIG_SYS_MAXARGS + 1]; /* NULL terminated */
int argc, inquotes;
int repeatable = 1;
int rc = 0;
#ifdef DEBUG_PARSER //没定义
printf ("[RUN_COMMAND] cmd[%p]=\"", cmd);
puts (cmd ? cmd : "NULL"); /* use puts - string may be loooong */
puts ("\"\n");
#endif
clear_ctrlc(); /* forget any previous Control C */
if (!cmd || !*cmd) { // 1 空命令 ，退出
return -1; /* empty command */
}
if (strlen(cmd) >= CONFIG_SYS_CBSIZE) {
puts ("## Command too long!\n");
return -1;
}
strcpy (cmdbuf, cmd); // 3 把命令copy to cmdbuf
/* Process separators and check for invalid
* repeatable commands
*/
#ifdef DEBUG_PARSER //没定义
printf ("[PROCESS_SEPARATORS] %s\n", cmd);
#endif
while (*str) {
/*
* Find separator, or string end
* Allow simple escape of ';' by writing "\;"
*/
// 4、以分隔符\;来查找命令
for (inquotes = 0, sep = str; *sep; sep++) {
if ((*sep=='\'') &&
(*(sep-1) != '\\'))
inquotes=!inquotes;
if (!inquotes && /* 中间有单纯的 ； 则退出*/
(*sep == ';') && /* separator */
( sep != str) && /* past string start */
(*(sep-1) != '\\')) /* and NOT escaped */
break;
}
/*
* Limit the token to data between separators
*/
token = str; //最终获得的命令token
if (*sep) {
str = sep + 1; /* start of command for next pass */
*sep = '\0'; /* 给前一个命令加上结束符*/
}
else
str = sep; /* no more commands for next pass */
#ifdef DEBUG_PARSER //没定义
printf ("token: \"%s\"\n", token);
#endif
/* find macros in this token and replace them */
process_macros (token, finaltoken); //分离命令和其参数
/* Extract arguments */
if ((argc = parse_line (finaltoken, argv)) == 0) {
rc = -1; /* no command at all */
continue;
}
/* Look up command in command table */
if ((cmdtp = find_cmd(argv[0])) == NULL) { //5、查找命令
// find_cmd()负责匹配输入的命令，从列表中找出对应的命令结构体并返回指向这一结构体的指针。
printf ("Unknown command '%s' - try 'help'\n", argv[0]);
rc = -1; /* give up after bad command */
continue;
}
/* found - check max args */
if (argc > cmdtp->maxargs) { // 命令所带的参数个数
cmd_usage(cmdtp);
rc = -1;
continue;
}
#if defined(CONFIG_CMD_BOOTD)
/* avoid "bootd" recursion */
if (cmdtp->cmd == do_bootd) {
#ifdef DEBUG_PARSER //没定义
printf ("[%s]\n", finaltoken);
#endif
if (flag & CMD_FLAG_BOOTD) {
puts ("'bootd' recursion detected\n");
rc = -1;
continue;
} else {
flag |= CMD_FLAG_BOOTD;
}
}
#endif
/* OK - call function to do the command */
if ((cmdtp->cmd) (cmdtp, flag, argc, argv) != 0) {
//6、把参数传递过去，执行命令
rc = -1;
}
repeatable &= cmdtp->repeatable;
/* Did the user stop this? */
if (had_ctrlc ())
return -1; /* if stopped then not repeatable */
}
return rc ? rc : repeatable;
}
/****************************************************************************/
#if defined(CONFIG_CMD_RUN)
int do_run (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
int i;
if (argc < 2) {
cmd_usage(cmdtp);
return 1;
}
for (i=1; i
char *arg;
if ((arg = getenv (argv[i])) == NULL) {
printf ("## Error: \"%s\" not defined\n", argv[i]);
return 1;
}
#ifndef CONFIG_SYS_HUSH_PARSER
if (run_command (arg, flag) == -1)
return 1;
#else
if (parse_string_outer(arg,
FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP) != 0)
return 1;
#endif
}
return 0;
}
#endif
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