mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-21 22:53:37 +00:00
02b64d5cec
This change was done almost entirely automatically using the script
below. This uses the OCaml lexer to read the source files and extract
the strings and locations. Strings which are "candidates" (in this
case, longer than 3 lines) are replaced in the output with quoted
string literals.
Since the OCaml lexer is used, it already substitutes all escape
sequences correctly. I diffed the output of the generator and it is
identical after this change, except for UUIDs, which change because of
how Utils.stable_uuid is implemented.
Thanks: Nicolas Ojeda Bar
$ ocamlfind opt -package unix,compiler-libs.common find_strings.ml \
-o find_strings.opt -linkpkg
$ for f in $( git ls-files -- \*.ml ) ; do ./find_strings.opt $f ; done
open Printf
let read_whole_file path =
let buf = Buffer.create 16384 in
let chan = open_in path in
let maxlen = 16384 in
let b = Bytes.create maxlen in
let rec loop () =
let r = input chan b 0 maxlen in
if r > 0 then (
Buffer.add_substring buf (Bytes.to_string b) 0 r;
loop ()
)
in
loop ();
close_in chan;
Buffer.contents buf
let count_chars c str =
let count = ref 0 in
for i = 0 to String.length str - 1 do
if c = String.unsafe_get str i then incr count
done;
!count
let subs = ref []
let consider_string str loc =
let nr_lines = count_chars '\n' str in
if nr_lines > 3 then
subs := (str, loc) :: !subs
let () =
Lexer.init ();
let filename = Sys.argv.(1) in
let content = read_whole_file filename in
let lexbuf = Lexing.from_string content in
let rec loop () =
let token = Lexer.token lexbuf in
(match token with
| Parser.EOF -> ();
| STRING (s, loc, sopt) ->
consider_string s loc; (* sopt? *)
loop ();
| token ->
loop ();
)
in
loop ();
(* The list of subs is already reversed, which is convenient
* because we must the file substitutions in reverse order.
*)
let subs = !subs in
let new_content = ref content in
List.iter (
fun (str, loc) ->
let { Location.loc_start = { pos_cnum = p1 };
loc_end = { pos_cnum = p2 } } = loc in
let len = String.length !new_content in
let before = String.sub !new_content 0 (p1-1) in
let after = String.sub !new_content (p2+1) (len - p2 - 1) in
new_content := before ^ "{|" ^ str ^ "|}" ^ after
) subs;
let new_content = !new_content in
if content <> new_content then (
(* Update the file in place. *)
let new_filename = filename ^ ".new"
and backup_filename = filename ^ ".bak" in
let chan = open_out new_filename in
fprintf chan "%s" new_content;
close_out chan;
Unix.rename filename backup_filename;
Unix.rename new_filename filename
)
536 lines
17 KiB
OCaml
536 lines
17 KiB
OCaml
(* libguestfs
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* Copyright (C) 2013 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*)
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(* Please read generator/README first. *)
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open Printf
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open Std_utils
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open Types
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open Utils
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open Pr
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open Docstrings
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open Optgroups
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open Actions
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open Structs
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open C
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open Events
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let generate_header = generate_header ~inputs:["generator/golang.ml"]
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let generate_golang_go () =
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generate_header CStyle LGPLv2plus;
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pr {|package guestfs
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/*
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#cgo CFLAGS: -DGUESTFS_PRIVATE=1 -DGUESTFS_NO_WARN_DEPRECATED -UGUESTFS_NO_DEPRECATED
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#cgo LDFLAGS: -lguestfs
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#include <stdio.h>
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#include <stdlib.h>
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#include "guestfs.h"
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// cgo can't deal with variable argument functions.
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static guestfs_h *
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_go_guestfs_create_flags (unsigned flags)
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{
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return guestfs_create_flags (flags);
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}
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// Passing a Go pointer to C via CGo is allowed, but the memory that points to
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// is not allowed to contain further Go pointers. The helper functions below
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// are one way to implement this, although the same can be achieved purely in
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// Go as well. See the discussion here:
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// <https://listman.redhat.com/archives/libguestfs/2021-September/msg00101.html>.
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typedef char *pChar;
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pChar *allocStringArray (size_t nmemb)
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{
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pChar *array;
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array = malloc (sizeof (pChar) * (nmemb + 1));
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array[nmemb] = NULL;
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return array;
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}
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void storeString (pChar *array, size_t idx, pChar string)
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{
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array[idx] = string;
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}
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void freeStringArray (pChar *array)
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{
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pChar *position;
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pChar string;
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position = array;
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while ((string = *position) != NULL) {
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free (string);
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position++;
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}
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free (array);
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}
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*/
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import "C"
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import (
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"fmt"
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"runtime"
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"syscall"
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"unsafe"
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)
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/* Handle. */
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type Guestfs struct {
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g *C.guestfs_h
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}
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/* Convert handle to string (just for debugging). */
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func (g *Guestfs) String () string {
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return "&Guestfs{}"
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}
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/* Create a new handle with flags. */
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type CreateFlags uint
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const (
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CREATE_NO_ENVIRONMENT = CreateFlags (C.GUESTFS_CREATE_NO_ENVIRONMENT)
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CREATE_NO_CLOSE_ON_EXIT = CreateFlags (C.GUESTFS_CREATE_NO_CLOSE_ON_EXIT)
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)
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func Create_flags (flags CreateFlags) (*Guestfs, error) {
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c_g, err := C._go_guestfs_create_flags (C.uint (flags))
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if c_g == nil {
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return nil, err
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}
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g := &Guestfs{g : c_g}
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// Finalizers aren't guaranteed to run, but try having one anyway ...
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runtime.SetFinalizer (g, (*Guestfs).Close)
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return g, nil
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}
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/* Create a new handle without flags. */
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func Create () (*Guestfs, error) {
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return Create_flags (0)
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}
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/* Apart from Create() and Create_flags() which return a (handle, error)
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* pair, the other functions return a ([result,] GuestfsError) where
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* GuestfsError is defined here.
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*/
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type GuestfsError struct {
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Op string // operation which failed
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Errmsg string // string (guestfs_last_error)
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Errno syscall.Errno // errno (guestfs_last_errno)
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}
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func (e *GuestfsError) String() string {
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if e.Errno != 0 {
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return fmt.Sprintf ("%%s: %%s", e.Op, e.Errmsg);
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} else {
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return fmt.Sprintf ("%%s: %%s: %%s", e.Op, e.Errmsg, e.Errno);
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}
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}
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/* Implement the error interface */
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func (e *GuestfsError) Error() string {
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return e.String()
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}
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func get_error_from_handle (g *Guestfs, op string) *GuestfsError {
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// NB: DO NOT try to free c_errmsg!
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c_errmsg := C.guestfs_last_error (g.g)
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errmsg := C.GoString (c_errmsg)
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errno := syscall.Errno (C.guestfs_last_errno (g.g))
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return &GuestfsError{ Op : op, Errmsg : errmsg, Errno : errno }
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}
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func closed_handle_error (op string) *GuestfsError {
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return &GuestfsError{ Op : op, Errmsg : "handle is closed",
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Errno : syscall.Errno (0) }
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}
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/* Close the handle. */
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func (g *Guestfs) Close () *GuestfsError {
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if g.g == nil {
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return closed_handle_error ("close")
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}
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C.guestfs_close (g.g)
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g.g = nil
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return nil
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}
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/* Functions for translating between NULL-terminated lists of
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* C strings and golang []string.
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*/
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func arg_string_list (xs []string) **C.char {
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r := C.allocStringArray (C.size_t (len (xs)))
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for i, x := range xs {
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C.storeString (r, C.size_t (i), C.CString (x));
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}
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return (**C.char) (r)
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}
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func count_string_list (argv **C.char) int {
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var i int
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for *argv != nil {
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i++
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argv = (**C.char) (unsafe.Pointer (uintptr (unsafe.Pointer (argv)) +
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unsafe.Sizeof (*argv)))
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}
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return i
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}
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func free_string_list (argv **C.char) {
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C.freeStringArray ((*C.pChar) (argv))
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}
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func return_string_list (argv **C.char) []string {
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r := make ([]string, count_string_list (argv))
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var i int
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for *argv != nil {
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r[i] = C.GoString (*argv)
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i++
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argv = (**C.char) (unsafe.Pointer (uintptr (unsafe.Pointer (argv)) +
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unsafe.Sizeof (*argv)))
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}
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return r
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}
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func return_hashtable (argv **C.char) map[string]string {
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r := make (map[string]string)
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for *argv != nil {
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key := C.GoString (*argv)
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argv = (**C.char) (unsafe.Pointer (uintptr (unsafe.Pointer (argv)) +
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unsafe.Sizeof (*argv)))
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if *argv == nil {
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panic ("odd number of items in hash table")
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}
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r[key] = C.GoString (*argv)
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argv = (**C.char) (unsafe.Pointer (uintptr (unsafe.Pointer (argv)) +
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unsafe.Sizeof (*argv)))
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}
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return r
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}
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/* XXX Events/callbacks not yet implemented. */
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|};
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(* Structures. *)
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List.iter (
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fun { s_camel_name = name; s_name = c_name; s_cols = cols } ->
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pr "\n";
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pr "type %s struct {\n" name;
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List.iter (
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fun (n, field) ->
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(* We capitalize the field names so that they are
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* publicly accessible.
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*)
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let n = String.capitalize_ascii n in
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match field with
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| FChar -> pr " %s byte\n" n
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| FString | FDevice -> pr " %s string\n" n
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| FBuffer -> pr " %s []byte\n" n
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| FUInt32 -> pr " %s uint32\n" n
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| FInt32 -> pr " %s int32\n" n
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| FUInt64 -> pr " %s uint64\n" n
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| FInt64 -> pr " %s int64\n" n
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| FBytes -> pr " %s uint64\n" n
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| FUUID -> pr " %s [32]byte\n" n
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| FOptPercent -> pr " %s float32\n" n
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) cols;
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pr "}\n";
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pr "\n";
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pr "func return_%s (c *C.struct_guestfs_%s) *%s {\n" name c_name name;
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pr " r := %s{}\n" name;
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List.iter (
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fun (n, field) ->
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let gon = String.capitalize_ascii n in
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match field with
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| FChar -> pr " r.%s = byte (c.%s)\n" gon n
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| FString | FDevice -> pr " r.%s = C.GoString (c.%s)\n" gon n
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| FBuffer ->
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pr " r.%s = C.GoBytes (unsafe.Pointer (c.%s), C.int (c.%s_len))\n"
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gon n n
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| FUInt32 -> pr " r.%s = uint32 (c.%s)\n" gon n
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| FInt32 -> pr " r.%s = int32 (c.%s)\n" gon n
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| FUInt64 -> pr " r.%s = uint64 (c.%s)\n" gon n
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| FInt64 -> pr " r.%s = int64 (c.%s)\n" gon n
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| FBytes -> pr " r.%s = uint64 (c.%s)\n" gon n
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| FOptPercent -> pr " r.%s = float32 (c.%s)\n" gon n
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| FUUID ->
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pr " // XXX doesn't work XXX r.%s = C.GoBytes (c.%s, len (c.%s))\n" gon n n;
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pr " r.%s = [32]byte{}\n" gon
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) cols;
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pr " return &r\n";
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pr "}\n";
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pr "\n";
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pr "func return_%s_list (c *C.struct_guestfs_%s_list) *[]%s {\n"
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name c_name name;
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pr " nrelems := int (c.len)\n";
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pr " ptr := uintptr (unsafe.Pointer (c.val))\n";
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pr " elemsize := unsafe.Sizeof (*c.val)\n";
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pr " r := make ([]%s, nrelems)\n" name;
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pr " for i := 0; i < nrelems; i++ {\n";
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pr " r[i] = *return_%s ((*C.struct_guestfs_%s) (unsafe.Pointer (ptr)))\n"
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name c_name;
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pr " ptr += elemsize";
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pr " }\n";
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pr " return &r\n";
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pr "}\n";
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) external_structs;
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(* Actions. *)
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List.iter (
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fun ({ name; shortdesc; style = (ret, args, optargs) } as f) ->
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let go_name = String.capitalize_ascii name in
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(* If it has optional arguments, pass them in a struct
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* after the required arguments.
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*)
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if optargs <> [] then (
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pr "\n";
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pr "/* Struct carrying optional arguments for %s */\n" go_name;
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pr "type Optargs%s struct {\n" go_name;
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List.iter (
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fun optarg ->
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let cn = String.capitalize_ascii (name_of_optargt optarg) in
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pr " /* %s field is ignored unless %s_is_set == true */\n"
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cn cn;
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pr " %s_is_set bool\n" cn;
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match optarg with
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| OBool _ ->
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pr " %s bool\n" cn
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| OInt _ ->
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pr " %s int\n" cn
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| OInt64 _ ->
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pr " %s int64\n" cn
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| OString _ ->
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pr " %s string\n" cn
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| OStringList _ ->
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pr " %s []string\n" cn
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) optargs;
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pr "}\n";
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);
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pr "\n";
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pr "/* %s : %s */\n" name shortdesc;
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pr "func (g *Guestfs) %s" go_name;
|
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|
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(* Arguments. *)
|
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pr " (";
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let comma = ref false in
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List.iter (
|
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fun arg ->
|
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if !comma then pr ", ";
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comma := true;
|
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match arg with
|
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| Bool n -> pr "%s bool" n
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| Int n -> pr "%s int" n
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| Int64 n -> pr "%s int64" n
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| String (_, n) -> pr "%s string" n
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| OptString n -> pr "%s *string" n
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| StringList (_, n) -> pr "%s []string" n
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| BufferIn n -> pr "%s []byte" n
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| Pointer (_, n) -> pr "%s int64" n
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) args;
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if optargs <> [] then (
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if !comma then pr ", ";
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comma := true;
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pr "optargs *Optargs%s" go_name
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);
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pr ")";
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|
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(* Return type. *)
|
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let noreturn =
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match ret with
|
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| RErr -> pr " error"; ""
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| RInt _ -> pr " (int, error)"; "0, "
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| RInt64 _ -> pr " (int64, error)"; "0, "
|
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| RBool _ -> pr " (bool, error)"; "false, "
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| RConstString _
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| RString _ -> pr " (string, error)"; "\"\", "
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| RConstOptString _ -> pr " (*string, error)"; "nil, "
|
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| RStringList _ -> pr " ([]string, error)"; "nil, "
|
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| RStruct (_, sn) ->
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let sn = camel_name_of_struct sn in
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pr " (*%s, error)" sn;
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sprintf "&%s{}, " sn
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| RStructList (_, sn) ->
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let sn = camel_name_of_struct sn in
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pr " (*[]%s, error)" sn;
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"nil, "
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| RHashtable _ -> pr " (map[string]string, error)"; "nil, "
|
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| RBufferOut _ -> pr " ([]byte, error)"; "nil, " in
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|
|
(* Body of the function. *)
|
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pr " {\n";
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pr " if g.g == nil {\n";
|
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pr " return %sclosed_handle_error (\"%s\")\n" noreturn name;
|
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pr " }\n";
|
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|
|
List.iter (
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function
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|
| Bool n ->
|
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pr "\n";
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pr " var c_%s C.int\n" n;
|
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pr " if %s { c_%s = 1 } else { c_%s = 0 }\n" n n n
|
|
| String (_, n) ->
|
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pr "\n";
|
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pr " c_%s := C.CString (%s)\n" n n;
|
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pr " defer C.free (unsafe.Pointer (c_%s))\n" n
|
|
| OptString n ->
|
|
pr "\n";
|
|
pr " var c_%s *C.char = nil\n" n;
|
|
pr " if %s != nil {\n" n;
|
|
pr " c_%s = C.CString (*%s)\n" n n;
|
|
pr " defer C.free (unsafe.Pointer (c_%s))\n" n;
|
|
pr " }\n"
|
|
| StringList (_, n) ->
|
|
pr "\n";
|
|
pr " c_%s := arg_string_list (%s)\n" n n;
|
|
pr " defer free_string_list (c_%s)\n" n
|
|
| BufferIn n ->
|
|
pr "\n";
|
|
pr " /* string() cast here is apparently safe because\n";
|
|
pr " * \"Converting a slice of bytes to a string type yields\n";
|
|
pr " * a string whose successive bytes are the elements of\n";
|
|
pr " * the slice.\"\n";
|
|
pr " */\n";
|
|
pr " c_%s := C.CString (string (%s))\n" n n;
|
|
pr " defer C.free (unsafe.Pointer (c_%s))\n" n
|
|
| Int _
|
|
| Int64 _
|
|
| Pointer _ -> ()
|
|
) args;
|
|
|
|
if optargs <> [] then (
|
|
pr " c_optargs := C.struct_guestfs_%s_argv{}\n" f.c_name;
|
|
pr " if optargs != nil {\n";
|
|
List.iter (
|
|
fun optarg ->
|
|
let n = name_of_optargt optarg in
|
|
let cn = String.capitalize_ascii n in
|
|
pr " if optargs.%s_is_set {\n" cn;
|
|
pr " c_optargs.bitmask |= C.%s_%s_BITMASK\n"
|
|
f.c_optarg_prefix (String.uppercase_ascii n);
|
|
(match optarg with
|
|
| OBool _ ->
|
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pr " if optargs.%s { c_optargs.%s = 1 } else { c_optargs.%s = 0}\n" cn n n
|
|
| OInt _ ->
|
|
pr " c_optargs.%s = C.int (optargs.%s)\n" n cn
|
|
| OInt64 _ ->
|
|
pr " c_optargs.%s = C.int64_t (optargs.%s)\n" n cn
|
|
| OString _ ->
|
|
pr " c_optargs.%s = C.CString (optargs.%s)\n" n cn;
|
|
pr " defer C.free (unsafe.Pointer (c_optargs.%s))\n" n
|
|
| OStringList _ ->
|
|
pr " c_optargs.%s = arg_string_list (optargs.%s)\n"
|
|
n cn;
|
|
pr " defer free_string_list (c_optargs.%s)\n" n
|
|
);
|
|
pr " }\n"
|
|
) optargs;
|
|
pr " }\n"
|
|
);
|
|
|
|
(match ret with
|
|
| RBufferOut _ ->
|
|
pr "\n";
|
|
pr " var size C.size_t\n"
|
|
| _ -> ()
|
|
);
|
|
|
|
pr "\n";
|
|
pr " r := C.%s (g.g" f.c_function;
|
|
List.iter (
|
|
fun arg ->
|
|
pr ", ";
|
|
match arg with
|
|
| Bool n -> pr "c_%s" n
|
|
| Int n -> pr "C.int (%s)" n
|
|
| Int64 n -> pr "C.int64_t (%s)" n
|
|
| String (_, n)
|
|
| OptString n -> pr "c_%s" n
|
|
| StringList (_, n) -> pr "c_%s" n
|
|
| BufferIn n -> pr "c_%s, C.size_t (len (%s))" n n
|
|
| Pointer _ -> pr "nil"
|
|
) args;
|
|
(match ret with
|
|
| RBufferOut _ -> pr ", &size"
|
|
| _ -> ()
|
|
);
|
|
if optargs <> [] then
|
|
pr ", &c_optargs";
|
|
pr ")\n";
|
|
|
|
(match errcode_of_ret ret with
|
|
| `CannotReturnError -> ()
|
|
| `ErrorIsMinusOne ->
|
|
pr "\n";
|
|
pr " if r == -1 {\n";
|
|
pr " return %sget_error_from_handle (g, \"%s\")\n" noreturn name;
|
|
pr " }\n"
|
|
| `ErrorIsNULL ->
|
|
pr "\n";
|
|
pr " if r == nil {\n";
|
|
pr " return %sget_error_from_handle (g, \"%s\")\n" noreturn name;
|
|
pr " }\n"
|
|
);
|
|
|
|
(match ret with
|
|
| RErr -> pr " return nil\n"
|
|
| RInt _ -> pr " return int (r), nil\n"
|
|
| RInt64 _ -> pr " return int64 (r), nil\n"
|
|
| RBool _ -> pr " return r != 0, nil\n"
|
|
| RConstString _ ->
|
|
pr " return C.GoString (r), nil\n"
|
|
| RString _ ->
|
|
pr " defer C.free (unsafe.Pointer (r))\n";
|
|
pr " return C.GoString (r), nil\n"
|
|
| RConstOptString _ ->
|
|
pr " if r != nil {\n";
|
|
pr " r_s := string (rune (*r))\n";
|
|
pr " return &r_s, nil\n";
|
|
pr " } else {\n";
|
|
pr " return nil, nil\n";
|
|
pr " }\n"
|
|
| RStringList _ ->
|
|
pr " defer free_string_list (r)\n";
|
|
pr " return return_string_list (r), nil\n"
|
|
| RStruct (_, sn) ->
|
|
pr " defer C.guestfs_free_%s (r)\n" sn;
|
|
let sn = camel_name_of_struct sn in
|
|
pr " return return_%s (r), nil\n" sn
|
|
| RStructList (_, sn) ->
|
|
pr " defer C.guestfs_free_%s_list (r)\n" sn;
|
|
let sn = camel_name_of_struct sn in
|
|
pr " return return_%s_list (r), nil\n" sn
|
|
| RHashtable _ ->
|
|
pr " defer free_string_list (r)\n";
|
|
pr " return return_hashtable (r), nil\n"
|
|
| RBufferOut _ ->
|
|
pr " defer C.free (unsafe.Pointer (r))\n";
|
|
pr " return C.GoBytes (unsafe.Pointer (r), C.int (size)), nil\n"
|
|
);
|
|
pr "}\n";
|
|
) (actions |> external_functions |> sort)
|