-# stpncpy.m4 serial 4
-dnl Copyright (C) 2002-2003, 2005-2006 Free Software Foundation, Inc.
+# stpncpy.m4 serial 15
+dnl Copyright (C) 2002-2003, 2005-2007, 2009-2011 Free Software Foundation,
+dnl Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_STPNCPY],
[
dnl Persuade glibc <string.h> to declare stpncpy().
- AC_REQUIRE([AC_GNU_SOURCE])
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+ dnl The stpncpy() declaration in lib/string.in.h uses 'restrict'.
+ AC_REQUIRE([AC_C_RESTRICT])
+
+ AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
dnl Both glibc and AIX (4.3.3, 5.1) have an stpncpy() function
dnl declared in <string.h>. Its side effects are the same as those
dnl in AIX: dest + max(0,n-1)
dnl Only the glibc return value is useful in practice.
- AC_CACHE_CHECK([for working stpncpy], gl_cv_func_stpncpy, [
- AC_TRY_RUN([
+ AC_CHECK_DECLS_ONCE([stpncpy])
+ AC_CHECK_FUNCS_ONCE([stpncpy])
+ if test $ac_cv_func_stpncpy = yes; then
+ AC_CACHE_CHECK([for working stpncpy], [gl_cv_func_stpncpy], [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
#include <stdlib.h>
#include <string.h> /* for strcpy */
/* The stpncpy prototype is missing in <string.h> on AIX 4. */
-extern char *stpncpy (char *dest, const char *src, size_t n);
-int main () {
+#if !HAVE_DECL_STPNCPY
+extern
+# ifdef __cplusplus
+"C"
+# endif
+char *stpncpy (char *dest, const char *src, size_t n);
+#endif
+int main ()
+{
+ int result = 0;
const char *src = "Hello";
char dest[10];
/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+1 here. */
- strcpy (dest, "\377\377\377\377\377\377");
- if (stpncpy (dest, src, 2) != dest + 2) exit(1);
+ {
+ strcpy (dest, "\377\377\377\377\377\377");
+ if (stpncpy (dest, src, 2) != dest + 2)
+ result |= 1;
+ }
/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+4 here. */
- strcpy (dest, "\377\377\377\377\377\377");
- if (stpncpy (dest, src, 5) != dest + 5) exit(1);
+ {
+ strcpy (dest, "\377\377\377\377\377\377");
+ if (stpncpy (dest, src, 5) != dest + 5)
+ result |= 2;
+ }
/* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+6 here. */
- strcpy (dest, "\377\377\377\377\377\377");
- if (stpncpy (dest, src, 7) != dest + 5) exit(1);
- exit(0);
+ {
+ strcpy (dest, "\377\377\377\377\377\377");
+ if (stpncpy (dest, src, 7) != dest + 5)
+ result |= 4;
+ }
+ return result;
}
-], gl_cv_func_stpncpy=yes, gl_cv_func_stpncpy=no,
- [AC_EGREP_CPP([Thanks for using GNU], [
+]])],
+ [gl_cv_func_stpncpy=yes],
+ [gl_cv_func_stpncpy=no],
+ [AC_EGREP_CPP([Thanks for using GNU], [
#include <features.h>
#ifdef __GNU_LIBRARY__
Thanks for using GNU
#endif
-], gl_cv_func_stpncpy=yes, gl_cv_func_stpncpy=no)])])
-
- if test $gl_cv_func_stpncpy = yes; then
- AC_DEFINE(HAVE_STPNCPY, 1,
- [Define if you have the stpncpy() function and it works.])
+], [gl_cv_func_stpncpy=yes], [gl_cv_func_stpncpy=no])
+ ])
+ ])
+ if test $gl_cv_func_stpncpy = yes; then
+ AC_DEFINE([HAVE_STPNCPY], [1],
+ [Define if you have the stpncpy() function and it works.])
+ else
+ REPLACE_STPNCPY=1
+ fi
else
- AC_LIBOBJ([stpncpy])
- gl_PREREQ_STPNCPY
+ HAVE_STPNCPY=0
fi
])
AC_DEFUN([gl_PREREQ_STPNCPY], [
:
])
-