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# serial 21
# See if we need to emulate a missing ftruncate function using _chsize.
# Copyright (C) 2000-2001, 2003-2007, 2009-2021 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_FTRUNCATE],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([ftruncate])
if test $ac_cv_func_ftruncate = yes; then
m4_ifdef([gl_LARGEFILE], [
AC_REQUIRE([AC_CANONICAL_HOST])
case "$host_os" in
mingw*)
dnl Native Windows, and Large File Support is requested.
dnl The MSVCRT _chsize() function only accepts a 32-bit file size,
dnl and the mingw64 ftruncate64() function is unreliable (it may
dnl delete the file, see
dnl <https://web.archive.org/web/20160425005423/http://mingw-w64.sourcearchive.com/documentation/2.0-1/ftruncate64_8c_source.html>).
dnl Use gnulib's ftruncate() implementation instead.
REPLACE_FTRUNCATE=1
;;
esac
], [
:
])
else
HAVE_FTRUNCATE=0
fi
])
# Prerequisites of lib/ftruncate.c.
AC_DEFUN([gl_PREREQ_FTRUNCATE],
[
AC_CHECK_FUNCS([_chsize])
])
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