1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
3 ;;;; FILE IDENTIFICATION
6 ;;;; Purpose: UFFI Example file to strtol, uses pointer arithmetic
7 ;;;; Programmer: Kevin M. Rosenberg
8 ;;;; Date Started: Feb 2002
10 ;;;; $Id: strtol.lisp,v 1.1 2002/09/30 10:02:36 kevin Exp $
12 ;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg
14 ;;;; UFFI users are granted the rights to distribute and use this software
15 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
16 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
17 ;;;; *************************************************************************
21 (uffi:def-foreign-type char-ptr (* :unsigned-char))
23 ;; This example does not use :cstring to pass the input string since
24 ;; the routine needs to do pointer arithmetic to see how many characters
27 (uffi:def-function ("strtol" c-strtol)
33 (defun strtol (str &optional (base 10))
34 "Returns a long int from a string. Returns number and condition flag.
35 Condition flag is T if all of string parses as a long, NIL if
36 their was no string at all, or an integer indicating position in string
37 of first non-valid character"
38 (let* ((str-native (uffi:convert-to-foreign-string str))
39 (endptr (uffi:allocate-foreign-object 'char-ptr))
40 (value (c-strtol str-native endptr base))
41 (endptr-value (uffi:deref-pointer endptr 'char-ptr)))
44 (if (uffi:null-pointer-p endptr-value)
46 (let ((next-char-value (uffi:deref-pointer endptr-value :unsigned-char))
47 (chars-parsed (- (uffi:pointer-address endptr-value)
48 (uffi:pointer-address str-native))))
52 ((uffi:null-char-p next-char-value)
55 (values value chars-parsed)))))
57 (uffi:free-foreign-object str-native)
58 (uffi:free-foreign-object endptr)))))
64 (flet ((print-results (str)
65 (multiple-value-bind (result flag) (strtol str)
66 (format t "~&(strtol ~S) => ~S,~S" str result flag))))
68 (print-results "55.3")
73 (flet ((test-strtol (str results)
74 (util.test:test (multiple-value-list (strtol str)) results
76 :fail-info "Error testing strtol")))
77 (test-strtol "123" '(123 t))
78 (test-strtol "0" '(0 t))
79 (test-strtol "55a" '(55 2))
80 (test-strtol "a" '(nil nil))))