uci_lookup_ptr

uci_lookup_ptr是一个函数，用于查询UCI配置文件中指定元素的指针。它需要一个UCI上下文结构体和一个UCI指针结构体作为参数，以及一个字符串和一个布尔值。如果extended参数为true，则可以使用通配符查询多个元素。该函数将返回一个指向查询元素的指针，如果未找到元素，则返回NULL。

相关问题

int uci_lookup_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str, bool extended);

As an AI language model, I cannot access the implementation details of the function `uci_lookup_ptr` in the context of the codebase it is used in. However, I can explain the purpose and parameters of the function, which may be useful for understanding its behavior.

The `uci_lookup_ptr` function is part of the UCI (Unified Configuration Interface) library, which is used for managing configuration data in OpenWrt and other embedded Linux systems. This function is used to look up a configuration item by its path, which is specified as a string in the `str` parameter. The result is returned in the `ptr` parameter, which is a pointer to a `struct uci_ptr` object that contains information about the configuration item, such as its name, value, and type.

The `ctx` parameter is a pointer to a `struct uci_context` object, which is used for managing the memory and resources used by the UCI library. The `extended` parameter is a boolean flag that specifies whether to perform an extended lookup, which includes searching for default values and package-specific configurations.

The function returns an integer value that indicates the success or failure of the lookup operation. A value of 0 indicates success, and a negative value indicates an error, which can be checked using the `uci_get_errorstr` function.

int uci_lookup_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str, bool extended)作用

该函数用于查找UCI配置文件中指定路径的指针并返回。它包括以下参数：

- ctx：UCI上下文结构体指针。
- ptr：UCI指针结构体指针，用于存储查找结果。
- str：查找路径，格式为“config.section.option”。
- extended：是否启用扩展模式。如果启用，则表示查找路径中可以包含“@”符号，用于指定指针的具体行号。

该函数的返回值为0表示查找成功，非0值表示查找失败。