use lowercase io error messages in vexos modules

Author: Tropix126

library/std/src/sys/fs/vexos.rs

@@ -201,11 +201,11 @@ impl File {
                 let status = unsafe { vex_sdk::vexFileStatus(path.as_ptr()) };
 
                 if opts.create_new && status != 0 {
-                    return Err(io::const_error!(io::ErrorKind::AlreadyExists, "File exists",));
+                    return Err(io::const_error!(io::ErrorKind::AlreadyExists, "file exists",));
                 } else if !opts.create && status == 0 {
                     return Err(io::const_error!(
                         io::ErrorKind::NotFound,
-                        "No such file or directory",
+                        "no such file or directory",
                     ));
                 }
             }
@@ -215,7 +215,7 @@ impl File {
                 OpenOptions { read: true, write: true, .. } => {
                     return Err(io::const_error!(
                         io::ErrorKind::InvalidInput,
-                        "Opening files with read and write access is unsupported on this target",
+                        "opening files with read and write access is unsupported on this target",
                     ));
                 }
 
@@ -259,12 +259,12 @@ impl File {
                 },
 
                 _ => {
-                    return Err(io::const_error!(io::ErrorKind::InvalidInput, "Invalid argument"));
+                    return Err(io::const_error!(io::ErrorKind::InvalidInput, "invalid argument"));
                 }
             };
 
             if file.is_null() {
-                Err(io::const_error!(io::ErrorKind::NotFound, "Could not open file"))
+                Err(io::const_error!(io::ErrorKind::NotFound, "could not open file"))
             } else {
                 Ok(Self { fd: FileDesc(file) })
             }
@@ -279,7 +279,7 @@ impl File {
         }) {
             Ok(FileAttr::File { size })
         } else {
-            Err(io::const_error!(io::ErrorKind::InvalidData, "Failed to get file size"))
+            Err(io::const_error!(io::ErrorKind::InvalidData, "failed to get file size"))
         }
     }
 
@@ -324,7 +324,7 @@ impl File {
         };
 
         if read < 0 {
-            Err(io::const_error!(io::ErrorKind::Other, "Could not read from file"))
+            Err(io::const_error!(io::ErrorKind::Other, "could not read from file"))
         } else {
             Ok(read as usize)
         }
@@ -352,7 +352,7 @@ impl File {
         };
 
         if written < 0 {
-            Err(io::const_error!(io::ErrorKind::Other, "Could not write to file"))
+            Err(io::const_error!(io::ErrorKind::Other, "could not write to file"))
         } else {
             Ok(written as usize)
         }
@@ -380,7 +380,7 @@ impl File {
         let position = unsafe { vex_sdk::vexFileTell(self.fd.0) };
 
         position.try_into().map_err(|_| {
-            io::const_error!(io::ErrorKind::InvalidData, "Failed to get current location in file")
+            io::const_error!(io::ErrorKind::InvalidData, "failed to get current location in file")
         })
     }
 
@@ -397,7 +397,7 @@ impl File {
             offset.try_into().map_err(|_| {
                 io::const_error!(
                     io::ErrorKind::InvalidInput,
-                    "Cannot seek to an offset too large to fit in a 32 bit integer",
+                    "cannot seek to an offset too large to fit in a 32 bit integer",
                 )
             })
         }
@@ -497,7 +497,8 @@ pub fn exists(path: &Path) -> io::Result<bool> {
 }
 
 pub fn stat(p: &Path) -> io::Result<FileAttr> {
-    // `vexFileStatus` returns 3 if the given path is a directory.
+    // `vexFileStatus` returns 3 if the given path is a directory, 1 if the path is a
+    // file, or 0 if no such path exists.
     const FILE_STATUS_DIR: u32 = 3;
 
     run_path_with_cstr(p, &|c_path| {

library/std/src/sys/stdio/vexos.rs

@@ -57,7 +57,7 @@ impl io::Write for Stdout {
             }
             .try_into()
             .map_err(|_| {
-                io::const_error!(io::ErrorKind::Uncategorized, "Internal write error occurred.")
+                io::const_error!(io::ErrorKind::Uncategorized, "internal write error occurred")
             })?;
 
             written += count;