xref: /netbsd-src/external/gpl2/diffutils/dist/m4/dos.m4 (revision 75f6d617e282811cb173c2ccfbf5df0dd71f7045)
1*75f6d617Schristos#serial 5
2*75f6d617Schristos
3*75f6d617Schristos# Define some macros required for proper operation of code in lib/*.c
4*75f6d617Schristos# on MSDOS/Windows systems.
5*75f6d617Schristos
6*75f6d617Schristos# From Jim Meyering.
7*75f6d617Schristos
8*75f6d617SchristosAC_DEFUN([jm_AC_DOS],
9*75f6d617Schristos  [
10*75f6d617Schristos    AC_CACHE_CHECK([whether system is Windows or MSDOS], [ac_cv_win_or_dos],
11*75f6d617Schristos      [
12*75f6d617Schristos        AC_TRY_COMPILE([],
13*75f6d617Schristos        [#if !defined _WIN32 && !defined __WIN32__ && !defined __MSDOS__
14*75f6d617Schristosneither MSDOS nor Windows
15*75f6d617Schristos#endif],
16*75f6d617Schristos        [ac_cv_win_or_dos=yes],
17*75f6d617Schristos        [ac_cv_win_or_dos=no])
18*75f6d617Schristos      ])
19*75f6d617Schristos
20*75f6d617Schristos    if test x"$ac_cv_win_or_dos" = xyes; then
21*75f6d617Schristos      ac_fs_accepts_drive_letter_prefix=1
22*75f6d617Schristos      ac_fs_backslash_is_file_name_separator=1
23*75f6d617Schristos    else
24*75f6d617Schristos      ac_fs_accepts_drive_letter_prefix=0
25*75f6d617Schristos      ac_fs_backslash_is_file_name_separator=0
26*75f6d617Schristos    fi
27*75f6d617Schristos
28*75f6d617Schristos    AH_VERBATIM(FILESYSTEM_PREFIX_LEN,
29*75f6d617Schristos    [#if FILESYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX
30*75f6d617Schristos# define FILESYSTEM_PREFIX_LEN(Filename) \
31*75f6d617Schristos  ((Filename)[0] && (Filename)[1] == ':' ? 2 : 0)
32*75f6d617Schristos#else
33*75f6d617Schristos# define FILESYSTEM_PREFIX_LEN(Filename) 0
34*75f6d617Schristos#endif])
35*75f6d617Schristos
36*75f6d617Schristos    AC_DEFINE_UNQUOTED([FILESYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX],
37*75f6d617Schristos      $ac_fs_accepts_drive_letter_prefix,
38*75f6d617Schristos      [Define on systems for which file names may have a so-called
39*75f6d617Schristos       `drive letter' prefix, define this to compute the length of that
40*75f6d617Schristos       prefix, including the colon.])
41*75f6d617Schristos
42*75f6d617Schristos    AH_VERBATIM(ISSLASH,
43*75f6d617Schristos    [#if FILESYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR
44*75f6d617Schristos# define ISSLASH(C) ((C) == '/' || (C) == '\\')
45*75f6d617Schristos#else
46*75f6d617Schristos# define ISSLASH(C) ((C) == '/')
47*75f6d617Schristos#endif])
48*75f6d617Schristos
49*75f6d617Schristos    AC_DEFINE_UNQUOTED([FILESYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR],
50*75f6d617Schristos      $ac_fs_backslash_is_file_name_separator,
51*75f6d617Schristos      [Define if the backslash character may also serve as a file name
52*75f6d617Schristos       component separator.])
53*75f6d617Schristos  ])
54