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/*
* (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, <luo.jinhua@gd-linux.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <bootretry.h>
#include <cli.h>
#include <console.h>
#include <linux/ctype.h>
#define DEBUG_PARSER 0 /* set to 1 to debug */
#define debug_parser(fmt, args...) \
debug_cond(DEBUG_PARSER, fmt, ##args)
int cli_simple_parse_line(char *line, char *argv[])
{
int nargs = 0;
debug_parser("%s: \"%s\"\n", __func__, line);
while (nargs < CONFIG_SYS_MAXARGS) {
/* skip any white space */
while (isblank(*line))
++line;
if (*line == '\0') { /* end of line, no more args */
argv[nargs] = NULL;
debug_parser("%s: nargs=%d\n", __func__, nargs);
return nargs;
}
argv[nargs++] = line; /* begin of argument string */
/* find end of string */
while (*line && !isblank(*line))
++line;
if (*line == '\0') { /* end of line, no more args */
argv[nargs] = NULL;
debug_parser("parse_line: nargs=%d\n", nargs);
return nargs;
}
*line++ = '\0'; /* terminate current arg */
}
printf("** Too many args (max. %d) **\n", CONFIG_SYS_MAXARGS);
debug_parser("%s: nargs=%d\n", __func__, nargs);
return nargs;
}
void cli_simple_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 ''' */
char __maybe_unused *output_start = output;
debug_parser("[PROCESS_MACROS] INPUT len %zd: \"%s\"\n", strlen(input),
input);
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;
/* Varname # of chars */
int envcnt = input - varname_start - 1;
/* 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;
debug_parser("[PROCESS_MACROS] OUTPUT len %zd: \"%s\"\n",
strlen(output_start), output_start);
}
/*
* 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 cli_simple_run_command(const char *cmd, int flag)
{
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;
debug_parser("[RUN_COMMAND] cmd[%p]=\"", cmd);
if (DEBUG_PARSER) {
/* use puts - string may be loooong */
puts(cmd ? cmd : "NULL");
puts("\"\n");
}
clear_ctrlc(); /* forget any previous Control C */
if (!cmd || !*cmd)
return -1; /* empty command */
if (strlen(cmd) >= CONFIG_SYS_CBSIZE) {
puts("## Command too long!\n");
return -1;
}
strcpy(cmdbuf, cmd);
/* Process separators and check for invalid
* repeatable commands
*/
debug_parser("[PROCESS_SEPARATORS] %s\n", cmd);
while (*str) {
/*
* Find separator, or string end
* Allow simple escape of ';' by writing "\;"
*/
for (inquotes = 0, sep = str; *sep; sep++) {
if ((*sep == '\'') &&
(*(sep - 1) != '\\'))
inquotes = !inquotes;
if (!inquotes &&
(*sep == ';') && /* separator */
(sep != str) && /* past string start */
(*(sep - 1) != '\\')) /* and NOT escaped */
break;
}
/*
* Limit the token to data between separators
*/
token = str;
if (*sep) {
str = sep + 1; /* start of command for next pass */
*sep = '\0';
} else {
str = sep; /* no more commands for next pass */
}
debug_parser("token: \"%s\"\n", token);
/* find macros in this token and replace them */
cli_simple_process_macros(token, finaltoken);
/* Extract arguments */
argc = cli_simple_parse_line(finaltoken, argv);
if (argc == 0) {
rc = -1; /* no command at all */
continue;
}
if (cmd_process(flag, argc, argv, &repeatable, NULL))
rc = -1;
/* Did the user stop this? */
if (had_ctrlc())
return -1; /* if stopped then not repeatable */
}
return rc ? rc : repeatable;
}
void cli_simple_loop(void)
{
static char lastcommand[CONFIG_SYS_CBSIZE + 1] = { 0, };
int len;
int flag;
int rc = 1;
for (;;) {
if (rc >= 0) {
/* Saw enough of a valid command to
* restart the timeout.
*/
bootretry_reset_cmd_timeout();
}
len = cli_readline(CONFIG_SYS_PROMPT);
flag = 0; /* assume no special flags for now */
if (len > 0)
strcpy(lastcommand, console_buffer);
else if (len == 0)
flag |= CMD_FLAG_REPEAT;
#ifdef CONFIG_BOOT_RETRY_TIME
else if (len == -2) {
/* -2 means timed out, retry autoboot
*/
puts("\nTimed out waiting for command\n");
# ifdef CONFIG_RESET_TO_RETRY
/* Reinit board to run initialization code again */
do_reset(NULL, 0, 0, NULL);
# else
return; /* retry autoboot */
# endif
}
#endif
if (len == -1)
puts("<INTERRUPT>\n");
else
rc = run_command_repeatable(lastcommand, flag);
if (rc <= 0) {
/* invalid command or not repeatable, forget it */
lastcommand[0] = 0;
}
}
}
int cli_simple_run_command_list(char *cmd, int flag)
{
char *line, *next;
int rcode = 0;
/*
* Break into individual lines, and execute each line; terminate on
* error.
*/
next = cmd;
line = cmd;
while (*next) {
if (*next == '\n') {
*next = '\0';
/* run only non-empty commands */
if (*line) {
debug("** exec: \"%s\"\n", line);
if (cli_simple_run_command(line, 0) < 0) {
rcode = 1;
break;
}
}
line = next + 1;
}
++next;
}
if (rcode == 0 && *line)
rcode = (cli_simple_run_command(line, 0) < 0);
return rcode;
}