• Top
    • Documentation
    • Books
    • Boolean-reasoning
    • Projects
    • Debugging
    • Std
    • Community
    • Proof-automation
    • Macro-libraries
    • ACL2
      • Theories
      • Rule-classes
      • Proof-builder
      • Recursion-and-induction
      • Hons-and-memoization
      • Events
      • Parallelism
      • History
      • Programming
        • Defun
        • Declare
        • System-utilities
        • Stobj
        • State
        • Mutual-recursion
        • Memoize
        • Mbe
        • Io
        • Defpkg
        • Apply$
        • Loop$
        • Programming-with-state
        • Arrays
        • Characters
          • Character-listp
          • Characterp
          • Coerce
          • Digit-char-p
          • Code-char
          • Char-code
          • Char-upcase
          • Char-downcase
          • Standard-char-p
          • Char
          • Alpha-char-p
          • Upper-case-p
          • Lower-case-p
          • Explode-nonnegative-integer
          • Explode-atom
          • Char-equal
          • Digit-to-char
          • Char<
          • Char>=
          • Make-character-list
            • Std/strings/make-character-list
            • Character-list-fix
          • Char>
          • Char<=
          • Standard-char-listp
          • Character-alistp
          • Standard-char-p+
          • Chars-upcase-gen
          • Chars-downcase-gen
          • Char-upcase-gen
          • Char-downcase-gen
        • Time$
        • Defconst
        • Defmacro
        • Loop$-primer
        • Fast-alists
        • Evaluation
        • Guard
        • Equality-variants
        • Compilation
        • Hons
        • ACL2-built-ins
        • Developers-guide
        • System-attachments
        • Advanced-features
        • Set-check-invariant-risk
        • Numbers
        • Efficiency
        • Irrelevant-formals
        • Introduction-to-programming-in-ACL2-for-those-who-know-lisp
        • Redefining-programs
        • Lists
        • Invariant-risk
        • Errors
        • Defabbrev
        • Conses
        • Alists
        • Set-register-invariant-risk
        • Strings
        • Program-wrapper
        • Get-internal-time
        • Basics
        • Packages
        • Oracle-eval
        • Defmacro-untouchable
        • <<
        • Primitive
        • Revert-world
        • Unmemoize
        • Set-duplicate-keys-action
        • Symbols
        • Def-list-constructor
        • Easy-simplify-term
        • Defiteration
        • Fake-oracle-eval
        • Defopen
        • Sleep
      • Operational-semantics
      • Real
      • Start-here
      • Debugging
      • Miscellaneous
      • Output-controls
      • Macros
      • Interfacing-tools
    • Interfacing-tools
    • Hardware-verification
    • Software-verification
    • Math
    • Testing-utilities
  • Characters
  • ACL2-built-ins

Make-character-list

coerce to a list of characters

Non-characters in the given list are coerced to the character with code 0.

Function: make-character-list

(defun make-character-list (x)
  (declare (xargs :guard t))
  (cond ((atom x) nil)
        ((characterp (car x))
         (cons (car x)
               (make-character-list (cdr x))))
        (t (cons *null-char*
                 (make-character-list (cdr x))))))

Subtopics

Std/strings/make-character-list
Lemmas about make-character-list in the std/strings library.
Character-list-fix
Inline fixing function for character lists.