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
12 ;;;; This file, part of UFFI, is Copyright (c) 2002-2003 by Kevin M. Rosenberg
14 ;;;; *************************************************************************
16 (in-package #:uffi-tests)
18 (uffi:def-foreign-type char-ptr (* :unsigned-char))
20 ;; This example does not use :cstring to pass the input string since
21 ;; the routine needs to do pointer arithmetic to see how many characters
24 (uffi:def-function ("strtol" c-strtol)
31 (defun strtol (str &optional (base 10))
32 "Returns a long int from a string. Returns number and condition flag.
33 Condition flag is T if all of string parses as a long, NIL if
34 their was no string at all, or an integer indicating position in string
35 of first non-valid character"
36 (let* ((str-native (uffi:convert-to-foreign-string str))
37 (endptr (uffi:allocate-foreign-object 'char-ptr))
38 (value (c-strtol str-native endptr base))
39 (endptr-value (uffi:deref-pointer endptr 'char-ptr)))
42 (if (uffi:null-pointer-p endptr-value)
44 (let ((next-char-value (uffi:deref-pointer endptr-value :unsigned-char))
45 (chars-parsed (- (uffi:pointer-address endptr-value)
46 (uffi:pointer-address str-native))))
50 ((uffi:null-char-p next-char-value)
53 (values value chars-parsed)))))
55 (uffi:free-foreign-object str-native)
56 (uffi:free-foreign-object endptr)))))
58 (deftest strtol.1 (strtol "123") 123 t)
59 (deftest strtol.2 (strtol "0") 0 t)
60 (deftest strtol.3 (strtol "55a") 55 2)
61 (deftest strtol.4 (strtol "a") nil nil)