libconfig fix parse_config

libconfig/src/lib.rs

@@ -3,6 +3,7 @@ extern crate alloc;
 
 use core::fmt;
 use alloc::{string::FromUtf8Error, string::String, vec::Vec, rc::Rc};
+use fatfs::{self as fatfs, SeekFrom, Write, Read, Seek};
 use libboard_zynq::sdio;
 
 pub mod sd_reader;
@@ -53,32 +54,20 @@ impl<'a> From<FromUtf8Error> for Error<'a> {
 fn parse_config<'a>(
     key: &'a str,
     buffer: &mut Vec<u8>,
-    file: fatfs::File<sd_reader::SdReader>,
+    file: fatfs::File<sd_reader::SdReader, fatfs::DefaultTimeProvider, fatfs::LossyOemCpConverter>,
 ) -> Result<'a, ()> {
     let prefix = [key, "="].concat().to_ascii_lowercase();
-    let mut file_buf: Vec<u8> = Vec::new();
-    loop {
-        match memchr::memchr(b'\n', &file_buf) {
-            Some(i) => {
-                let s = String::from_utf8(&file_buf[..=i])
-                if s.starts_with(&prefix) {
-                    buffer.extend_from_slice(&file_buf[..=i]);
-                    return Ok(())
-                } else {
-                    file.consume(i + 1)
-                }
-            }
-            None => {
-                let s = String::from_utf8(file_buf)
-                if s.starts_with(&prefix) {
-                    buffer.extend_from_slice(file_buf);
-                    return Ok(())
-                } else {
-                    return Err(Error::KeyNotFoundError(key))
-                }
-            }
+    let file_buf = &mut []; 
+    let length = file.read(file_buf)?;
+    let s = core::str::from_utf8(file_buf)?;
+    for line in s.lines() {
+        let line = line.make_ascii_lowercase()?;
+        if line.starts_with(&prefix) {
+            buffer.extend(line[prefix.len()..].as_bytes());
+            return Ok(());
         }
     }
+    Err(Error::KeyNotFoundError(key))
 }
 
 pub struct Config {