Function yyjson_read_opts 

pub unsafe extern "C" fn yyjson_read_opts(
    dat: *mut c_char,
    len: usize,
    flg: yyjson_read_flag,
    alc: *const yyjson_alc,
    err: *mut yyjson_read_err,
) -> *mut yyjson_doc

Read JSON with options.

This function is thread-safe when:

1. The dat is not modified by other threads.
2. The alc is thread-safe or NULL.

@param dat The JSON data (UTF-8 without BOM), null-terminator is not required. If this parameter is NULL, the function will fail and return NULL. The dat will not be modified without the flag YYJSON_READ_INSITU, so you can pass a const char * string and case it to char * if you don’t use the YYJSON_READ_INSITU flag. @param len The length of JSON data in bytes. If this parameter is 0, the function will fail and return NULL. @param flg The JSON read options. Multiple options can be combined with | operator. 0 means no options. @param alc The memory allocator used by JSON reader. Pass NULL to use the libc’s default allocator. @param err A pointer to receive error information. Pass NULL if you don’t need error information. @return A new JSON document, or NULL if an error occurs. When it’s no longer needed, it should be freed with yyjson_doc_free().