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• Tempfile

Default-tempfile-aux

Join together a temp directory, the user name, the PID, and the base name to create a temporary filename.

Signature

(default-tempfile-aux tempdir basename state) 
  → 
(mv tempfile new-state)

Arguments

tempdir — Directory to generate the file in.
    Guard (stringp tempdir).

basename — Base name to use for the new file.
    Guard (stringp basename).

Returns

tempfile — Something like $TEMPDIR/$USER-$PID-$BASENAME.
    Type (or (stringp tempfile) (not tempfile)).

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

Definitions and Theorems

Function: default-tempfile-aux

(defun default-tempfile-aux (tempdir basename state)
  (declare (xargs :stobjs (state)))
  (declare (xargs :guard (and (stringp tempdir)
                              (stringp basename))))
  (let ((__function__ 'default-tempfile-aux))
    (declare (ignorable __function__))
    (b* (((mv pid state) (getpid state))
         ((unless (natp pid))
          (er hard? __function__ "getpid failed")
          (mv nil state))
         ((mv ?err user state)
          (getenv$ "USER" state))
         ((unless (stringp user))
          (er hard?
              __function__ "reading $USER failed")
          (mv nil state))
         (filename (cat user "-" (str::nat-to-dec-string pid)
                        "-" basename))
         (path (catpath tempdir filename)))
      (mv path state))))

Theorem: return-type-of-default-tempfile-aux.tempfile

(defthm return-type-of-default-tempfile-aux.tempfile
  (b* (((mv ?tempfile ?new-state)
        (default-tempfile-aux tempdir basename state)))
    (or (stringp tempfile) (not tempfile)))
  :rule-classes :type-prescription)

Theorem: state-p1-of-default-tempfile-aux.new-state

(defthm state-p1-of-default-tempfile-aux.new-state
  (implies (force (state-p1 state))
           (b* (((mv ?tempfile ?new-state)
                 (default-tempfile-aux tempdir basename state)))
             (state-p1 new-state)))
  :rule-classes :rewrite)

Theorem: w-state-of-default-tempfile-aux

(defthm w-state-of-default-tempfile-aux
  (b* (((mv ?tempfile ?new-state)
        (default-tempfile-aux tempdir basename state)))
    (equal (w new-state) (w state))))