在uboot中添加解析ini配置文件的命令

1、在u-boot-2010.06/include/configs目录的xxx.h（xxx是board，如hi3520d.h）里面添加如下宏定义：

#define CONFIG_CMD_INI

2、
在u-boot-2010.06/common目录的Makefile里面添加如下定义：

<pre name="code" class="html">     COBJS-$(CONFIG_CMD_INI) += cmd_ini.o

3、
在u-boot-2010.06/common目录下添加一个文件cmd_ini.c，代码如下：

#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <netdev.h>

#ifdef CONFIG_INI_MAX_LINE
#define MAX_LINE CONFIG_INI_MAX_LINE
#else
#define MAX_LINE 200
#endif

#ifdef CONFIG_INI_MAX_SECTION
#define MAX_SECTION CONFIG_INI_MAX_SECTION
#else
#define MAX_SECTION 50
#endif

#ifdef CONFIG_INI_MAX_NAME
#define MAX_NAME CONFIG_INI_MAX_NAME
#else
#define MAX_NAME 50
#endif

/* Strip whitespace chars off end of given string, in place. Return s. */
static char *rstrip(char *s)
{
char *p = s + strlen(s);

while (p > s && isspace(*--p))
*p = '\0';
return s;
}

/* Return pointer to first non-whitespace char in given string. */
static char *lskip(const char *s)
{
while (*s && isspace(*s))
s++;
return (char *)s;
}

/* Return pointer to first char c or ';' comment in given string, or pointer to
null at end of string if neither found. ';' must be prefixed by a whitespace
character to register as a comment. */
static char *find_char_or_comment(const char *s, char c)
{
int was_whitespace = 0;

while (*s && *s != c && !(was_whitespace && *s == ';')) {
was_whitespace = isspace(*s);
s++;
}
return (char *)s;
}

/* Version of strncpy that ensures dest (size bytes) is null-terminated. */
static char *strncpy0(char *dest, const char *src, size_t size)
{
strncpy(dest, src, size);
dest[size - 1] = '\0';
return dest;
}

/* Emulate the behavior of fgets but on memory */
static char *memgets(char *str, int num, char **mem, size_t *memsize)
{
char *end;
int len;
int newline = 1;

end = memchr(*mem, '\n', *memsize);
if (end == NULL) {
if (*memsize == 0)
return NULL;
end = *mem + *memsize;
newline = 0;
}
len = min((end - *mem) + newline, num);
memcpy(str, *mem, len);
if (len < num)
str[len] = '\0';

/* prepare the mem vars for the next call */
*memsize -= (end - *mem) + newline;
*mem += (end - *mem) + newline;

return str;
}

/* Parse given INI-style file. May have [section]s, name=value pairs
(whitespace stripped), and comments starting with ';' (semicolon). Section
is "" if name=value pair parsed before any section heading. name:value
pairs are also supported as a concession to Python's ConfigParser.

For each name=value pair parsed, call handler function with given user
pointer as well as section, name, and value (data only valid for duration
of handler call). Handler should return nonzero on success, zero on error.

Returns 0 on success, line number of first error on parse error (doesn't
stop on first error).
*/

static int ini_parse(char *filestart, size_t filelen,
int (*handler)(void *, char *, char *, char *),	void *user)
{
/* Uses a fair bit of stack (use heap instead if you need to) */
char line[MAX_LINE];
char section[MAX_SECTION] = "";
char prev_name[MAX_NAME] = "";

char *curmem = filestart;
char *start;
char *end;
char *name;
char *value;
size_t memleft = filelen;
int lineno = 0;
int error = 0;

/* Scan through file line by line */
while (memgets(line, sizeof(line), &curmem, &memleft) != NULL) {
lineno++;
start = lskip(rstrip(line));

loop:
if (*start && *start != ';' && *start != '[') {
/* Not a comment, must be a name[=:]value pair */

end = find_char_or_comment(start, '=');
if (*end != '=')
end = find_char_or_comment(start, ':');
if (*end == '=' || *end == ':') {
*end = '\0';
name = rstrip(start);
value = lskip(end + 1);
end = find_char_or_comment(value, ';');
if(*end == ';'){								//batch cmd
*end = '\0';
end = find_char_or_comment(value, '\0');
rstrip(value);
/* Strip double-quotes */
if (value[0] == '"' &&
value[strlen(value)-1] == '"') {
value[strlen(value)-1] = '\0';
value += 1;
}

/*
* Valid name[=:]value pair found, call handler
*/
strncpy0(prev_name, name, sizeof(prev_name));
if (handler(user, section, name, value) &&
!error){
start = ++end;
goto loop;
}
else
error = lineno;
}
else{
end = find_char_or_comment(value, '\0');
if (*end == ';')
*end = '\0';
rstrip(value);
/* Strip double-quotes */
if (value[0] == '"' &&
value[strlen(value)-1] == '"') {
value[strlen(value)-1] = '\0';
value += 1;
}

/*
* Valid name[=:]value pair found, call handler
*/
strncpy0(prev_name, name, sizeof(prev_name));
if (!handler(user, section, name, value) &&
!error)
error = lineno;

}
}
else if (!error)
/* No '=' or ':' found on name[=:]value line */
error = lineno;
}
else if (*start == ';' || *start == '#') {
/*
* Per Python ConfigParser, allow '#' comments at start
* of line
*/
}
#if CONFIG_INI_ALLOW_MULTILINE
else if (*prev_name && *start && start > line) {
/*
* Non-blank line with leading whitespace, treat as
* continuation of previous name's value (as per Python
* ConfigParser).
*/
if (!handler(user, section, prev_name, start) && !error)
error = lineno;
}
#endif
else if (*start == '[') {
/* A "[section]" line */
end = find_char_or_comment(start + 1, ']');
if (*end == ']') {
*end = '\0';
strncpy0(section, start + 1, sizeof(section));
*prev_name = '\0';
} else if (!error) {
/* No ']' found on section line */
error = lineno;
}
}
if(error)
return error;
}
return error;
}

static int ini_handler(void *user, char *section, char *name, char *value)
{

char *requested_section = (char *)user;
int i, j;

#ifdef CONFIG_INI_CASE_INSENSITIVE

for (i = 0; i < strlen(requested_section); i++)
requested_section[i] = tolower(requested_section[i]);
for (i = 0; i < strlen(section); i++)
section[i] = tolower(section[i]);
#endif

if (!strcmp(section, requested_section)) {
#ifdef CONFIG_INI_CASE_INSENSITIVE
for (i = 0; i < strlen(name); i++)
name[i] = tolower(name[i]);
for (i = 0; i < strlen(value); i++)
value[i] = tolower(value[i]);
#endif
//setenv(name, value);
char buf[500];
sprintf(buf, "%s %s", name, value);
printf("%s\n", buf);
for(i=0; i<10; i++){
if(run_command(buf, 0) == -1){
printf("error, try again After 1 seconds\n");
udelay(1000000);
if (ctrlc()) {
puts ("\nAbort\n");
return 0;
}
if(i == 9)
return 0;
continue;
}
break;
}
}

/* success */
return 1;
}

static int do_ini(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
const char *section;
char *file_address;
size_t file_size;

if (argc == 1)
return CMD_RET_USAGE;

section = argv[1];
file_address = (char *)simple_strtoul(
argc < 3 ? getenv("loadaddr") : argv[2], NULL, 16);
file_size = (size_t)simple_strtoul(
argc < 4 ? getenv("filesize") : argv[3], NULL, 16);

return ini_parse(file_address, file_size, ini_handler, (void *)section);
}

U_BOOT_CMD(
ini, 4, 0, do_ini,
"parse an ini file in memory and merge the specified section into the env",
"section [[file-address] file-size]"
);
</span>

说明：1、INI文件的格式（举一个例子cmd.ini）：
;this
is a ini file //；为注释
[burn]
//[]里面为段名
tftp=0x82000000
FWHI2104HF_20151106_DVR_R5104-AHD_2_2_8_0A_413221.flash;sf=probe
0;
sf=erase
0x80000 0xF80000
sf=write
0x82000000 0x80000 0xF80000
reset=
[setting]
setenv=serverip
192.168.1.68 //name=value
setenv=ipaddr
192.168.1.10 //"="号可以用":"代替，value值也可以用双引号引起来
save=
//只有一个参数时也要带等号，右边空着

2、使用方法：
1）使用tftp命令把ini配置文件现在到板子的虚拟内存0x82000000处
tftp
0x82000000 cmd.ini
2)使用ini命令执行特定段里面的命令
ini
setting 0x82000000

3、命令格式错误或是不正确的命令等等原因导致命令不能正常进行时会每隔1秒重新执行一次，持续10次，
10次执行还不能正确执行会异常退出，不会执行下调命令。中途不想继续执行可以ctrl+c终止。