Added a read_entire_file proc that only takes a handle and turned it into a proc group with the one, that takes a path

core/os/os.odin

@@ -70,7 +70,7 @@ file_size_from_path :: proc(path: string) -> i64 {
 	return length
 }
 
-read_entire_file :: proc(name: string, allocator := context.allocator) -> (data: []byte, success: bool) {
+read_entire_file_from_filename :: proc(name: string, allocator := context.allocator) -> (data: []byte, success: bool) {
 	context.allocator = allocator
 
 	fd, err := open(name, O_RDONLY, 0)
@@ -79,7 +79,14 @@ read_entire_file :: proc(name: string, allocator := context.allocator) -> (data:
 	}
 	defer close(fd)
 
+	return read_entire_file_from_handle(fd, allocator)
+}
+
+read_entire_file_from_handle :: proc(fd: Handle, allocator := context.allocator) -> (data: []byte, success: bool) {
+	context.allocator = allocator
+
     length: i64
+    err: Errno
     if length, err = file_size(fd); err != 0 {
         return nil, false
     }
@@ -88,7 +95,7 @@ read_entire_file :: proc(name: string, allocator := context.allocator) -> (data:
         return nil, true
     }
 
-	data = make([]byte, int(length))
+    data = make([]byte, int(length), allocator)
     if data == nil {
         return nil, false
     }
@@ -101,6 +108,11 @@ read_entire_file :: proc(name: string, allocator := context.allocator) -> (data:
     return data[:bytes_read], true
 }
 
+read_entire_file :: proc {
+	read_entire_file_from_filename,
+	read_entire_file_from_handle,
+}
+
 write_entire_file :: proc(name: string, data: []byte, truncate := true) -> (success: bool) {
 	flags: int = O_WRONLY|O_CREATE
 	if truncate {