# serial 21

# Copyright (C) 2001, 2003, 2005, 2006, 2009 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.

dnl From Volker Borchert.
dnl Determine whether rename works for source file names with a trailing slash.
dnl The rename from SunOS 4.1.1_U1 doesn't.
dnl
dnl If it doesn't, then define RENAME_TRAILING_SLASH_BUG and arrange
dnl to compile the wrapper function.
dnl

AC_DEFUN([gl_FUNC_RENAME],
[
  AC_REQUIRE([AC_CANONICAL_HOST])
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  AC_CHECK_FUNCS_ONCE([lstat])

  dnl Solaris 10 mistakenly allows rename("file","name/").
  dnl NetBSD 1.6 mistakenly forbids rename("dir","name/").
  dnl FreeBSD 7.2 mistakenly allows rename("file","link-to-file/").
  dnl The Solaris bug can be worked around without stripping
  dnl trailing slash, while the NetBSD bug requires stripping;
  dnl the two conditions can be distinguished by whether hard
  dnl links are also broken.
  AC_CACHE_CHECK([whether rename honors trailing slash on destination],
    [gl_cv_func_rename_slash_dst_works],
    [rm -rf conftest.f conftest.f1 conftest.d1 conftest.d2 conftest.lnk
    touch conftest.f && mkdir conftest.d1 ||
      AC_MSG_ERROR([cannot create temporary files])
    # Assume that if we have lstat, we can also check symlinks.
    if test $ac_cv_func_lstat = yes; then
      ln -s conftest.f conftest.lnk
    fi
    AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#       include <stdio.h>
#       include <stdlib.h>
]], [if (rename ("conftest.f", "conftest.f1/") == 0) return 1;
     if (rename ("conftest.d1", "conftest.d2/") != 0) return 2;
#if HAVE_LSTAT
     if (rename ("conftest.f", "conftest.lnk/") == 0) return 3;
#endif
    ])],
      [gl_cv_func_rename_slash_dst_works=yes],
      [gl_cv_func_rename_slash_dst_works=no],
      dnl When crosscompiling, assume rename is broken.
      [gl_cv_func_rename_slash_dst_works="guessing no"])
    rm -rf conftest.f conftest.f1 conftest.d1 conftest.d2 conftest.lnk
  ])
  if test "x$gl_cv_func_rename_slash_dst_works" != xyes; then
    AC_LIBOBJ([rename])
    REPLACE_RENAME=1
    AC_DEFINE([RENAME_TRAILING_SLASH_DEST_BUG], [1],
      [Define if rename does not correctly handle slashes on the destination
       argument, such as on Solaris 10 or NetBSD 1.6.])
  fi

  dnl SunOS 4.1.1_U1 mistakenly forbids rename("dir/","name").
  dnl Solaris 9 mistakenly allows rename("file/","name").
  dnl FreeBSD 7.2 mistakenly allows rename("link-to-file/","name").
  dnl These bugs require stripping trailing slash to avoid corrupting
  dnl symlinks with a trailing slash.
  AC_CACHE_CHECK([whether rename honors trailing slash on source],
    [gl_cv_func_rename_slash_src_works],
    [rm -rf conftest.f conftest.d1 conftest.d2 conftest.lnk
    touch conftest.f && mkdir conftest.d1 ||
      AC_MSG_ERROR([cannot create temporary files])
    # Assume that if we have lstat, we can also check symlinks.
    if test $ac_cv_func_lstat = yes; then
      ln -s conftest.f conftest.lnk
    fi
    AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#       include <stdio.h>
#       include <stdlib.h>
]], [if (rename ("conftest.f/", "conftest.d2") == 0) return 1;
     if (rename ("conftest.d1/", "conftest.d2") != 0) return 2;
#if HAVE_LSTAT
     if (rename ("conftest.lnk/", "conftest.f") == 0) return 3;
#endif
    ])],
      [gl_cv_func_rename_slash_src_works=yes],
      [gl_cv_func_rename_slash_src_works=no],
      dnl When crosscompiling, assume rename is broken.
      [gl_cv_func_rename_slash_src_works="guessing no"])
    rm -rf conftest.f conftest.d1 conftest.d2 conftest.lnk
  ])
  if test "x$gl_cv_func_rename_slash_src_works" != xyes; then
    AC_LIBOBJ([rename])
    REPLACE_RENAME=1
    AC_DEFINE([RENAME_TRAILING_SLASH_SOURCE_BUG], [1],
      [Define if rename does not correctly handle slashes on the source
       argument, such as on Solaris 9 or cygwin 1.5.])
  fi

  dnl NetBSD 1.6 and cygwin 1.5.x mistakenly reduce hard link count
  dnl on rename("h1","h2").
  dnl This bug requires stat'ting targets prior to attempting rename.
  AC_CACHE_CHECK([whether rename manages hard links correctly],
    [gl_cv_func_rename_link_works],
    [rm -rf conftest.f conftest.f1
    if touch conftest.f && ln conftest.f conftest.f1 &&
        set x `ls -i conftest.f conftest.f1` && test "$2" = "$4"; then
      AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#       include <stdio.h>
#       include <stdlib.h>
#       include <unistd.h>
]], [if (rename ("conftest.f", "conftest.f1")) return 1;
     if (unlink ("conftest.f1")) return 2;
     if (rename ("conftest.f", "conftest.f")) return 3;
     if (rename ("conftest.f1", "conftest.f1") == 0) return 4;])],
        [gl_cv_func_rename_link_works=yes],
        [gl_cv_func_rename_link_works=no],
        dnl When crosscompiling, assume rename is broken.
        [gl_cv_func_rename_link_works="guessing no"])
    else
      gl_cv_func_rename_link_works="guessing no"
    fi
    rm -rf conftest.f conftest.f1
  ])
  if test "x$gl_cv_func_rename_link_works" != xyes; then
    AC_LIBOBJ([rename])
    REPLACE_RENAME=1
    AC_DEFINE([RENAME_HARD_LINK_BUG], [1],
      [Define if rename fails to leave hard links alone, as on NetBSD 1.6
       or Cygwin 1.5.])
  fi

  dnl Cygwin 1.5.x mistakenly allows rename("dir","file").
  dnl mingw mistakenly forbids rename("dir1","dir2").
  dnl These bugs require stripping trailing slash to avoid corrupting
  dnl symlinks with a trailing slash.
  AC_CACHE_CHECK([whether rename manages existing destinations correctly],
    [gl_cv_func_rename_dest_works],
    [rm -rf conftest.f conftest.d1 conftest.d2
    touch conftest.f && mkdir conftest.d1 conftest.d2 ||
      AC_MSG_ERROR([cannot create temporary files])
    AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#       include <stdio.h>
#       include <stdlib.h>
]], [if (rename ("conftest.d1", "conftest.d2") != 0) return 1;
     if (rename ("conftest.d2", "conftest.f") == 0) return 2;])],
      [gl_cv_func_rename_dest_works=yes],
      [gl_cv_func_rename_dest_works=no],
      dnl When crosscompiling, assume rename is broken.
      [gl_cv_func_rename_dest_works="guessing no"])
    rm -rf conftest.f conftest.d1 conftest.d2
  ])
  if test "x$gl_cv_func_rename_dest_works" != xyes; then
    AC_LIBOBJ([rename])
    REPLACE_RENAME=1
    AC_DEFINE([RENAME_DEST_EXISTS_BUG], [1],
      [Define if rename does not work when the destination file exists,
       as on Cygwin 1.5 or Windows.])
  fi
])