AT架构里面RESP里面的解析数据行数为什么要从1开始

发布于 2022-06-27 19:49:32 浏览：525 订阅该版

```c
/**
 * Get one line AT response buffer by line number.
 *
 * @param resp response object
 * @param resp_line line number, start from '1'
 *
 * @return != RT_NULL: response line buffer
 *          = RT_NULL: input response line error
 */
const char *at_resp_get_line(at_response_t resp, rt_size_t resp_line)
{
    char *resp_buf = resp->buf;
    char *resp_line_buf = RT_NULL;
    rt_size_t line_num = 1;

RT_ASSERT(resp);

if (resp_line > resp->line_counts || resp_line <= 0)
    {
        LOG_E("AT response get line failed! Input response line(%d) error!", resp_line);
        return RT_NULL;
    }

for (line_num = 1; line_num <= resp->line_counts; line_num++)
    {
        if (resp_line == line_num)
        {
            resp_line_buf = resp_buf;

return resp_line_buf;
        }

resp_buf += strlen(resp_buf) + 1;
    }

return RT_NULL;
}
```

类似于`at_resp_get_line`,`at_resp_get_line_by_kw`等函数中
为什么line_num要从1开始算？
是有什么特殊原因吗，感觉我改成用0开始为索引`client_parser`函数里面的行数判断好像也没啥问题？
求大佬解答