/usr/share/doc/cl-uffi/examples/strtol.lisp is in cl-uffi 2.1.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name: strtol.cl
;;;; Purpose: UFFI Example file to strtol, uses pointer arithmetic
;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Feb 2002
;;;;
;;;; This file, part of UFFI, is Copyright (c) 2002-2010 by Kevin M. Rosenberg
;;;;
;;;; *************************************************************************
(in-package :cl-user)
(uffi:def-foreign-type char-ptr (* :unsigned-char))
;; This example does not use :cstring to pass the input string since
;; the routine needs to do pointer arithmetic to see how many characters
;; were parsed
(uffi:def-function ("strtol" c-strtol)
((nptr char-ptr)
(endptr (* char-ptr))
(base :int))
:returning :long)
(defun strtol (str &optional (base 10))
"Returns a long int from a string. Returns number and condition flag.
Condition flag is T if all of string parses as a long, NIL if
their was no string at all, or an integer indicating position in string
of first non-valid character"
(let* ((str-native (uffi:convert-to-foreign-string str))
(endptr (uffi:allocate-foreign-object 'char-ptr))
(value (c-strtol str-native endptr base))
(endptr-value (uffi:deref-pointer endptr 'char-ptr)))
(unwind-protect
(if (uffi:null-pointer-p endptr-value)
(values value t)
(let ((next-char-value (uffi:deref-pointer endptr-value :unsigned-char))
(chars-parsed (- (uffi:pointer-address endptr-value)
(uffi:pointer-address str-native))))
(cond
((zerop chars-parsed)
(values nil nil))
((uffi:null-char-p next-char-value)
(values value t))
(t
(values value chars-parsed)))))
(progn
(uffi:free-foreign-object str-native)
(uffi:free-foreign-object endptr)))))
#+examples-uffi
(progn
(flet ((print-results (str)
(multiple-value-bind (result flag) (strtol str)
(format t "~&(strtol ~S) => ~S,~S" str result flag))))
(print-results "55")
(print-results "55.3")
(print-results "a")))
#+test-uffi
(progn
(flet ((test-strtol (str results)
(util.test:test (multiple-value-list (strtol str)) results
:test #'equal
:fail-info "Error testing strtol")))
(test-strtol "123" '(123 t))
(test-strtol "0" '(0 t))
(test-strtol "55a" '(55 2))
(test-strtol "a" '(nil nil))))
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