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• Loader

Vl-read-file

Read an entire file into a list of extended characters.

Signature

(vl-read-file filename &key (state 'state)) 
  → 
(mv okp result state)

Arguments

filename — The file to read.
    Guard (stringp filename).

Returns

okp — Type (booleanp okp).

result — On success, the entire contents of filename as a list of extended-characters.
    Type (vl-echarlist-p result), given the guard.

state — Type (state-p1 state), given (force (state-p1 state)).

We read the file with read-byte$ instead of read-char$, because this seems perhaps to be more reliable. In particular, even if the Lisp system wants to use Unicode or some other encoding for character streams, read-byte$ should always safely return octets.

Definitions and Theorems

Function: vl-read-file-fn

(defun vl-read-file-fn (filename state)
  (declare (xargs :stobjs (state)))
  (declare (xargs :guard (stringp filename)))
  (let ((__function__ 'vl-read-file))
    (declare (ignorable __function__))
    (b* ((filename (string-fix filename))
         ((mv channel state)
          (open-input-channel filename
                              :byte state))
         ((unless channel) (mv nil nil state))
         ((mv data state)
          (vl-read-file-loop channel filename 1 0))
         (state (close-input-channel channel state)))
      (mv t data state))))

Theorem: booleanp-of-vl-read-file.okp

(defthm booleanp-of-vl-read-file.okp
  (b* (((mv ?okp ?result acl2::?state)
        (vl-read-file-fn filename state)))
    (booleanp okp))
  :rule-classes :type-prescription)

Theorem: vl-echarlist-p-of-vl-read-file.result

(defthm vl-echarlist-p-of-vl-read-file.result
  (implies (and (force (state-p state))
                (force (stringp filename)))
           (b* (((mv ?okp ?result acl2::?state)
                 (vl-read-file-fn filename state)))
             (vl-echarlist-p result)))
  :rule-classes :rewrite)

Theorem: state-p1-of-vl-read-file.state

(defthm state-p1-of-vl-read-file.state
  (implies (force (state-p1 state))
           (b* (((mv ?okp ?result acl2::?state)
                 (vl-read-file-fn filename state)))
             (state-p1 state)))
  :rule-classes :rewrite)

Theorem: true-listp-of-vl-read-file

(defthm true-listp-of-vl-read-file
  (true-listp (mv-nth 1 (vl-read-file filename)))
  :rule-classes :type-prescription)

Theorem: vl-read-file-when-error

(defthm vl-read-file-when-error
  (b* (((mv okp result ?state)
        (vl-read-file filename)))
    (implies (not okp) (not result))))

Subtopics

Vl-read-file-loop

Logically nice loop for vl-read-file.

Vl-read-file-loop-aux

Tail-recursive, executable loop for vl-read-file.

Vl-read-file-rchars

Optimized alternative to vl-read-file that reads the entire file into nrev.