provide our own implementation of wxStrnlen if it's not available; add tests for it

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58069 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Id: configure.in 58039 2009-01-12 14:26:13Z VZ .
+# From configure.in Id: configure.in 58060 2009-01-12 23:25:39Z FM .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for wxWidgets 2.9.0.
 #
@@ -34955,101 +34955,9 @@ _ACEOF
     fi
 
 
-for ac_func in wcsdup
-do
-as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
-{ echo "$as_me:$LINENO: checking for $ac_func" >&5
-echo $ECHO_N "checking for $ac_func... $ECHO_C" >&6; }
-if { as_var=$as_ac_var; eval "test \"\${$as_var+set}\" = set"; }; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-/* Define $ac_func to an innocuous variant, in case <limits.h> declares $ac_func.
-   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
-#define $ac_func innocuous_$ac_func
-
-/* System header to define __stub macros and hopefully few prototypes,
-    which can conflict with char $ac_func (); below.
-    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
-    <limits.h> exists even on freestanding compilers.  */
-
-#ifdef __STDC__
-# include <limits.h>
-#else
-# include <assert.h>
-#endif
-
-#undef $ac_func
-
-/* Override any GCC internal prototype to avoid an error.
-   Use char because int might match the return type of a GCC
-   builtin and then its argument prototype would still apply.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-char $ac_func ();
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined __stub_$ac_func || defined __stub___$ac_func
-choke me
-#endif
-
-int
-main ()
-{
-return $ac_func ();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (ac_try="$ac_link"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_link") 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
-	 test ! -s conftest.err
-       } && test -s conftest$ac_exeext &&
-       $as_test_x conftest$ac_exeext; then
-  eval "$as_ac_var=yes"
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-	eval "$as_ac_var=no"
-fi
-
-rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
-      conftest$ac_exeext conftest.$ac_ext
-fi
-ac_res=`eval echo '${'$as_ac_var'}'`
-	       { echo "$as_me:$LINENO: result: $ac_res" >&5
-echo "${ECHO_T}$ac_res" >&6; }
-if test `eval echo '${'$as_ac_var'}'` = yes; then
-  cat >>confdefs.h <<_ACEOF
-#define `echo "HAVE_$ac_func" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-done
 
 
-for ac_func in strnlen
+for ac_func in wcsdup strnlen wcsnlen
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 { echo "$as_me:$LINENO: checking for $ac_func" >&5

configure.in

@@ -4047,8 +4047,7 @@ if test "$wxUSE_WCHAR_T" = "yes"; then
         AC_DEFINE(HAVE_WCSLEN)
     fi
 
-    AC_CHECK_FUNCS([wcsdup])
+    AC_CHECK_FUNCS([wcsdup strnlen wcsnlen])
-    AC_CHECK_FUNCS([strnlen])
 
     dnl On HP-UX aCC need this define to find mbstrtowcs() &c
     dnl Can't be used for g++ since the mbstate_t in wchar.h can conflict

include/wx/wxcrt.h

@@ -182,14 +182,33 @@ inline size_t wxStrlen(const wxString& s) { return s.length(); }
 inline size_t wxStrlen(const wxCStrData& s) { return s.AsString().length(); }
 
 // this is a function new in 2.9 so we don't care about backwards compatibility and
-// so don't need to support wchar_t/char overloads
+// so don't need to support wxCharBuffer/wxWCharBuffer overloads
-#if defined(wxCRT_StrnlenA) && defined(wxCRT_StrnlenW)
+#if defined(wxCRT_StrnlenA)
 inline size_t wxStrnlen(const char *str, size_t maxlen) { return wxCRT_StrnlenA(str, maxlen); }
+#else
+inline size_t wxStrnlen(const char *str, size_t maxlen)
+{
+    size_t n;
+    for ( n = 0; n < maxlen; n++ )
+        if ( !str[n] )
+            break;
+
+    return n;
+}
+#endif
+
+#if defined(wxCRT_StrnlenW)
 inline size_t wxStrnlen(const wchar_t *str, size_t maxlen) { return wxCRT_StrnlenW(str, maxlen); }
 #else
-// use unsafer wxStrlen:
+inline size_t wxStrnlen(const wchar_t *str, size_t maxlen)
-inline size_t wxStrnlen(const char *str, size_t maxlen) { return wxCRT_StrlenA(str); wxUnusedVar(maxlen); }
+{
-inline size_t wxStrnlen(const wchar_t *str, size_t maxlen) { return wxCRT_StrlenW(str); wxUnusedVar(maxlen); }
+    size_t n;
+    for ( n = 0; n < maxlen; n++ )
+        if ( !str[n] )
+            break;
+
+    return n;
+}
 #endif
 
 // NB: these are defined in wxcrtbase.h, see the comment there

include/wx/wxcrtbase.h

@@ -225,6 +225,9 @@ WXDLLIMPEXP_BASE void *calloc( size_t num, size_t size );
 /* Not all compilers have strnlen(); e.g. MSVC 6.x and 7.x don't have it */
 #if wxCHECK_VISUALC_VERSION(8) || defined(HAVE_STRNLEN)
     #define wxCRT_StrnlenA  strnlen
+#endif
+
+#if wxCHECK_VISUALC_VERSION(8) || defined(HAVE_WCSNLEN)
     #define wxCRT_StrnlenW  wcsnlen
 #endif
 

setup.h.in

@@ -921,6 +921,9 @@
 /* Define if you have strnlen() function */
 #undef HAVE_STRNLEN
 
+/* Define if you have wcsnlen() function */
+#undef HAVE_WCSNLEN
+
 /* Define if you have wcstoull() and wcstoll() */
 #undef HAVE_WCSTOULL
 

tests/strings/crt.cpp

@@ -4,7 +4,7 @@
 // Author:      Vaclav Slavik
 // Created:     2004-06-03
 // RCS-ID:      $Id$
-// Copyright:   (c) 2004 Vaclav Slavik 
+// Copyright:   (c) 2004 Vaclav Slavik
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -48,6 +48,7 @@ private:
         CPPUNIT_TEST( Strspn );
         CPPUNIT_TEST( Strcspn );
         CPPUNIT_TEST( Strpbrk );
+        CPPUNIT_TEST( Strnlen );
     CPPUNIT_TEST_SUITE_END();
 
     void SetGetEnv();
@@ -55,6 +56,7 @@ private:
     void Strspn();
     void Strcspn();
     void Strpbrk();
+    void Strnlen();
 
     DECLARE_NO_COPY_CLASS(CrtTestCase)
 };
@@ -209,3 +211,42 @@ void CrtTestCase::Strpbrk()
     CPPUNIT_ASSERT_EQUAL( (wchar_t *)NULL, wxStrpbrk(strWX.c_str(), L"xyz") );
 }
 
+void CrtTestCase::Strnlen()
+{
+    // the following calls should not segfault/crash because when passing 0
+    // as maxlen, no bytes at all should be read from the given buffer
+    // (which is NULL in this case!)
+    CPPUNIT_ASSERT_EQUAL(  (size_t)0, wxStrnlen((const char*)NULL, 0) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)0, wxStrnlen((const wchar_t*)NULL, 0) );
+
+    // other misc tests for wxStrnlen(const char*, size_t)
+
+    CPPUNIT_ASSERT_EQUAL(  (size_t)0, wxStrnlen("", 0) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)0, wxStrnlen("", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)0, wxStrnlen("1234", 0) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)2, wxStrnlen("1234", 2) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)4, wxStrnlen("1234", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)7, wxStrnlen("1234567", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)8, wxStrnlen("12345678", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)8, wxStrnlen("123456789", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)9, wxStrnlen("123456789", 12) );
+
+    // other misc tests for wxStrnlen(const wchar_t*, size_t)
+
+    CPPUNIT_ASSERT_EQUAL(  (size_t)0, wxStrnlen(L"", 0) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)0, wxStrnlen(L"", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)0, wxStrnlen(L"1234", 0) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)2, wxStrnlen(L"1234", 2) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)4, wxStrnlen(L"1234", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)7, wxStrnlen(L"1234567", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)8, wxStrnlen(L"12345678", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)8, wxStrnlen(L"123456789", 8) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)9, wxStrnlen(L"123456789", 12) );
+
+    // wxStrlen() is only for NULL-terminated strings:
+    CPPUNIT_ASSERT_EQUAL(  (size_t)4, wxStrnlen("1234" "\0" "78", 12) );
+    CPPUNIT_ASSERT_EQUAL(  (size_t)4, wxStrnlen(L"1234" L"\0" L"5678", 12) );
+}
+
+
+