allwinner script_parser_fetch（）函数
最近看allwinner方案。发现他们吧一些东西进行了修改。例如初始化之类的配置文件，allwinner把他们放在一起，这样做的好处就是 容易配置，所有初始化一目了然。非常方便，这个配置文件在哪提现到用呢？ALLwinner 在每个驱动初始化时候都加了这么一个函数：int script_parser_fetch(char *main_name, char *sub_name, int value[], int count)
这个函数就是读取相应初始化的函数，在每个驱动初始化的时候加上它，就能吧之前的配置读取出来。下面分析下这个函数
int script_parser_fetch(char *main_name, char *sub_name, int value[], int count)
{
char main_bkname[32], sub_bkname[32];
char *main_char, *sub_char;
script_main_key_t *main_key = NULL;
script_sub_key_t *sub_key = NULL;
int i, j;
int pattern, word_count;
pr_debug("enter script parse fetch. \n");
/* check params */
if(!script_mod_buf)
{
return SCRIPT_PARSER_EMPTY_BUFFER;
}
if((main_name == NULL) || (sub_name == NULL))
{
return SCRIPT_PARSER_KEYNAME_NULL;
}
if(value == NULL)
{
return SCRIPT_PARSER_DATA_VALUE_NULL;
}
/* truncate string if size >31 bytes */
main_char = main_name;
if(_test_str_length(main_name) > 31)
{
memset(main_bkname, 0, 32);
strncpy(main_bkname, main_name, 31);
main_char = main_bkname;
}
sub_char = sub_name;
if(_test_str_length(sub_name) > 31)
{
memset(sub_bkname, 0, 32);
strncpy(sub_bkname, sub_name, 31);
sub_char = sub_bkname;
}
pr_debug("gpio: main name is : %s, sub_name is: %s", main_char, sub_char);
for(i=0;i<script_main_key_count;i++)
{
main_key = (script_main_key_t *)(script_mod_buf + (sizeof(script_head_t)) + i * sizeof(script_main_key_t));
if(strcmp(main_key->main_name, main_char))
{
continue;//如果不是你要初始化的参数跳出去
}
/* now find sub key */
for(j=0;j<main_key->lenth;j++)
{
sub_key = (script_sub_key_t *)(script_mod_buf + (main_key->offset<<2) + (j * sizeof(script_sub_key_t)));
if(strcmp(sub_key->sub_name, sub_char))
{
continue; //如果不是你要初始化的参数跳出去
}
pattern = (sub_key->pattern>>16) & 0xffff; /* get datatype */
word_count = (sub_key->pattern>> 0) & 0xffff; /*get count of word */
pr_debug("pattern is: 0x%x, word_count is: 0x%x, ", pattern, word_count);
switch(pattern)
{
case SCIRPT_PARSER_VALUE_TYPE_SINGLE_WORD:
value[0] = *(int *)(script_mod_buf + (sub_key->offset<<2));
break;
case SCIRPT_PARSER_VALUE_TYPE_STRING:
if(count < word_count)
{
word_count = count;
}
memcpy((char *)value, script_mod_buf + (sub_key->offset<<2), word_count << 2);
break;
case SCIRPT_PARSER_VALUE_TYPE_MULTI_WORD:
break;
case SCIRPT_PARSER_VALUE_TYPE_GPIO_WORD:
{
script_gpio_set_t *user_gpio_cfg = (script_gpio_set_t *)value;
/* buffer space enough? */
if(sizeof(script_gpio_set_t) > (count<<2))
{
return SCRIPT_PARSER_BUFFER_NOT_ENOUGH;
}
strcpy( user_gpio_cfg->gpio_name, sub_char);
memcpy(&user_gpio_cfg->port, script_mod_buf + (sub_key->offset<<2), sizeof(script_gpio_set_t) - 32);
break;
}
}
return SCRIPT_PARSER_OK;
}
}
return SCRIPT_PARSER_KEY_NOT_FIND;
}
补充：web前端 , JavaScript ,
