Part of gnulib module 'stpncpy'.

diff --git a/gettext-tools/m4/stpncpy.m4 b/gettext-tools/m4/stpncpy.m4
new file mode 100644 (file)
index 0000000..aebfe73
--- /dev/null
+++ b/gettext-tools/m4/stpncpy.m4
@@ -0,0 +1,63 @@
+# stpncpy.m4 serial 1
+dnl Copyright (C) 2002-2003 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+AC_DEFUN([gl_FUNC_STPNCPY],
+[
+  dnl Persuade glibc <string.h> to declare stpncpy().
+  AC_REQUIRE([AC_GNU_SOURCE])
+
+  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 of strncpy():
+  dnl      stpncpy (dest, src, n)
+  dnl overwrites dest[0..n-1], min(strlen(src),n) bytes coming from src,
+  dnl and the remaining bytes being NULs.  However, the return value is
+  dnl   in glibc:   dest + min(strlen(src),n)
+  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([
+#include <stdlib.h>
+extern char *stpncpy (char *dest, const char *src, size_t n);
+int main () {
+  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);
+  /* 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);
+  /* 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);
+}
+], 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.])
+  else
+    AC_LIBOBJ([stpncpy])
+    gl_PREREQ_STPNCPY
+  fi
+])
+
+# Prerequisites of lib/stpncpy.c.
+AC_DEFUN([gl_PREREQ_STPNCPY], [
+  :
+])
+