os2: remove libc use on Linux

core/os/os2/path_linux.odin

@@ -207,3 +207,21 @@ _get_full_path :: proc(fd: linux.Fd, allocator: runtime.Allocator) -> (fullpath:
 	}
 	return
 }
+
+_get_absolute_path :: proc(path: string, allocator: runtime.Allocator) -> (absolute_path: string, err: Error) {
+	rel := path
+	if rel == "" {
+		rel = "."
+	}
+
+	temp_allocator := TEMP_ALLOCATOR_GUARD({ allocator })
+
+	fd, errno := linux.open(clone_to_cstring(path, temp_allocator) or_return, {})
+	if errno != nil {
+		err = _get_platform_error(errno)
+		return
+	}
+	defer linux.close(fd)
+
+	return _get_full_path(fd, allocator)
+}

core/os/os2/path_posix.odin

@@ -123,3 +123,20 @@ _set_working_directory :: proc(dir: string) -> (err: Error) {
 	}
 	return
 }
+
+_get_absolute_path :: proc(path: string, allocator: runtime.Allocator) -> (absolute_path: string, err: Error) {
+	rel := path
+	if rel == "" {
+		rel = "."
+	}
+	temp_allocator := TEMP_ALLOCATOR_GUARD({ allocator })
+	rel_cstr := clone_to_cstring(rel, temp_allocator) or_return
+	path_ptr := posix.realpath(rel_cstr, nil)
+	if path_ptr == nil {
+		return "", Platform_Error(posix.errno())
+	}
+	defer posix.free(path_ptr)
+
+	path_str := clone_string(string(path_ptr), allocator) or_return
+	return path_str, nil
+}

core/os/os2/path_posixfs.odin

@@ -4,10 +4,6 @@ package os2
 
 // This implementation is for all systems that have POSIX-compliant filesystem paths.
 
-import "base:runtime"
-import "core:strings"
-import "core:sys/posix"
-
 _are_paths_identical :: proc(a, b: string) -> (identical: bool) {
 	return a == b
 }
@@ -26,23 +22,6 @@ _is_absolute_path :: proc(path: string) -> bool {
 	return len(path) > 0 && _is_path_separator(path[0])
 }
 
-_get_absolute_path :: proc(path: string, allocator: runtime.Allocator) -> (absolute_path: string, err: Error) {
-	rel := path
-	if rel == "" {
-		rel = "."
-	}
-	temp_allocator := TEMP_ALLOCATOR_GUARD({ allocator })
-	rel_cstr := strings.clone_to_cstring(rel, temp_allocator)
-	path_ptr := posix.realpath(rel_cstr, nil)
-	if path_ptr == nil {
-		return "", Platform_Error(posix.errno())
-	}
-	defer posix.free(path_ptr)
-
-	path_str := strings.clone(string(path_ptr), allocator)
-	return path_str, nil
-}
-
 _get_relative_path_handle_start :: proc(base, target: string) -> bool {
 	base_rooted   := len(base)   > 0 && _is_path_separator(base[0])
 	target_rooted := len(target) > 0 && _is_path_separator(target[0])