Improve error handling and rename variables

src/runtime/src/config.rs

@@ -1,7 +1,7 @@
 use crate::sd_reader;
 use core::fmt;
 use alloc::{string::FromUtf8Error, string::String, vec::Vec};
-use core_io::{self as io, BufRead, BufReader, Read, Write};
+use core_io::{self as io, BufRead, BufReader, Read, Write, ErrorKind};
 
 use libboard_zynq::sdio;
 
@@ -107,19 +107,18 @@ impl Config {
     pub fn write_str<'b>(&mut self, key: &str, data: &str) -> Result<'b, ()>{
         if let Some(fs) = &self.fs {
             let root_dir = fs.root_dir();
-            let mut file;
 
-            let isascii_and_short =  data.is_ascii() & (data.len() <= 100);
+            let use_config_txt =  data.is_ascii() & (data.len() <= 100);
             let file_path;
             let config_key_bin = &["/CONFIG/", key, ".BIN"].concat();
 
-            if isascii_and_short {
+            if use_config_txt {
                 file_path = "/CONFIG.TXT";
             } else {
                 file_path = config_key_bin;
             }
 
-            file = match root_dir.create_file(file_path) {
+            let mut file = match root_dir.create_file(file_path) {
                 Ok(f) => f,
                 Err(_) => root_dir.open_file("/CONFIG.TXT")?
             };
@@ -128,10 +127,15 @@ impl Config {
             file.write_all(&[key,"="].concat().as_bytes())?;
             file.write_all(data.as_bytes())?;
 
-            if isascii_and_short {
+            if use_config_txt {
                 match root_dir.remove(config_key_bin) {
                     Ok(_) => {},
-                    Err(_) => {}
+                    Err(e) => match e.kind() {
+                        ErrorKind::NotFound => {},
+                        _ => {
+                            return Err(Error::IoError(e));
+                        }
+                    }
                 };
             }