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 ;;;; This file, part of UFFI, is Copyright (c) 2002-2010 by Kevin M. Rosenberg
12 ;;;; *************************************************************************
14 (in-package #:uffi-tests)
16 (uffi:def-foreign-type char-ptr (* :unsigned-char))
18 ;; This example does not use :cstring to pass the input string since
19 ;; the routine needs to do pointer arithmetic to see how many characters
22 (uffi:def-function ("strtol" c-strtol)
28 (defun strtol (str &optional (base 10))
29 "Returns a long int from a string. Returns number and condition flag.
30 Condition flag is T if all of string parses as a long, NIL if
31 their was no string at all, or an integer indicating position in string
32 of first non-valid character"
33 (let* ((str-native (uffi:convert-to-foreign-string str))
34 (endptr (uffi:allocate-foreign-object 'char-ptr))
35 (value (c-strtol str-native endptr base))
36 (endptr-value (uffi:deref-pointer endptr 'char-ptr)))
39 (if (uffi:null-pointer-p endptr-value)
41 (let ((next-char-value (uffi:deref-pointer endptr-value :unsigned-char))
42 (chars-parsed (- (uffi:pointer-address endptr-value)
43 (uffi:pointer-address str-native))))
47 ((uffi:null-char-p next-char-value)
50 (values value chars-parsed)))))
52 (uffi:free-foreign-object str-native)
53 (uffi:free-foreign-object endptr)))))
55 (deftest :strtol.1 (strtol "123") 123 t)
56 (deftest :strtol.2 (strtol "0") 0 t)
57 (deftest :strtol.3 (strtol "55a") 55 2)
58 (deftest :strtol.4 (strtol "a") nil nil)