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erlang: file:read_file/write_file/delete BIFs (+10 eval tests, 633/633)

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giles
2026-05-14 20:14:31 +00:00
parent 3d092dd78e
commit 29fd70f17a
5 changed files with 134 additions and 11 deletions
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72
lib/erlang/runtime.sx
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@@ -1304,6 +1304,74 @@
:else (error "Erlang: ets:info: arity"))))
;; ── file module (Phase 8 FFI) ────────────────────────────────────
;; Synchronous file IO. Filenames must be SX strings (or Erlang
;; binaries/char-code lists coercible to strings via er-source-to-string).
;; Returns `{ok, Binary}` / `ok` on success, `{error, Reason}` on failure
;; where Reason is one of `enoent`, `eacces`, `enotdir`, `posix_error`.
(define er-classify-file-error
(fn (msg)
(let ((s (str msg)))
(cond
(string-contains? s "No such") (er-mk-atom "enoent")
(string-contains? s "Permission denied") (er-mk-atom "eacces")
(string-contains? s "Not a directory") (er-mk-atom "enotdir")
(string-contains? s "Is a directory") (er-mk-atom "eisdir")
:else (er-mk-atom "posix_error")))))
(define er-bif-file-read-file
(fn (vs)
(let ((path (er-source-to-string (nth vs 0))))
(cond
(= path nil)
(er-mk-tuple (list (er-mk-atom "error") (er-mk-atom "badarg")))
:else
(let ((res (list nil)) (err (list nil)))
(guard (c (:else (set-nth! err 0 c)))
(set-nth! res 0 (file-read path)))
(cond
(not (= (nth err 0) nil))
(er-mk-tuple (list (er-mk-atom "error")
(er-classify-file-error (nth err 0))))
:else
(er-mk-tuple (list (er-mk-atom "ok")
(er-mk-binary (map char->integer (string->list (nth res 0))))))))))))
(define er-bif-file-write-file
(fn (vs)
(let ((path (er-source-to-string (nth vs 0)))
(data (er-source-to-string (nth vs 1))))
(cond
(or (= path nil) (= data nil))
(er-mk-tuple (list (er-mk-atom "error") (er-mk-atom "badarg")))
:else
(let ((err (list nil)))
(guard (c (:else (set-nth! err 0 c)))
(file-write path data))
(cond
(not (= (nth err 0) nil))
(er-mk-tuple (list (er-mk-atom "error")
(er-classify-file-error (nth err 0))))
:else (er-mk-atom "ok")))))))
(define er-bif-file-delete
(fn (vs)
(let ((path (er-source-to-string (nth vs 0))))
(cond
(= path nil)
(er-mk-tuple (list (er-mk-atom "error") (er-mk-atom "badarg")))
:else
(let ((err (list nil)))
(guard (c (:else (set-nth! err 0 c)))
(file-delete path))
(cond
(not (= (nth err 0) nil))
(er-mk-tuple (list (er-mk-atom "error")
(er-classify-file-error (nth err 0))))
:else (er-mk-atom "ok")))))))
;; ── builtin BIF registrations (Phase 8 migration) ────────────────
;; Populates `er-bif-registry` with every existing built-in BIF. Each
;; entry is keyed by "Module/Name/Arity"; multi-arity BIFs register
@@ -1394,6 +1462,10 @@
(er-register-bif! "code" "which" 1 er-bif-code-which)
(er-register-bif! "code" "is_loaded" 1 er-bif-code-is-loaded)
(er-register-bif! "code" "all_loaded" 0 er-bif-code-all-loaded)
;; file module
(er-register-bif! "file" "read_file" 1 er-bif-file-read-file)
(er-register-bif! "file" "write_file" 2 er-bif-file-write-file)
(er-register-bif! "file" "delete" 1 er-bif-file-delete)
(er-mk-atom "ok")))
;; Register everything at load time.