| 1 | /* isatty() replacement.
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| 2 | Copyright (C) 2012 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 3 of the License, or
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| 7 | (at your option) any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | #include <config.h>
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| 18 |
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| 19 | /* Specification. */
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| 20 | #include <unistd.h>
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| 21 |
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| 22 | /* This replacement is enabled on native Windows. */
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| 23 |
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| 24 | #include <errno.h>
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| 25 |
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| 26 | /* Get declarations of the Win32 API functions. */
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| 27 | #define WIN32_LEAN_AND_MEAN
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| 28 | #include <windows.h>
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| 29 |
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| 30 | #include "msvc-inval.h"
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| 31 |
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| 32 | /* Get _get_osfhandle(). */
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| 33 | #include "msvc-nothrow.h"
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| 34 |
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| 35 | /* Optimized test whether a HANDLE refers to a console.
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| 36 | See <http://lists.gnu.org/archive/html/bug-gnulib/2009-08/msg00065.html>. */
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| 37 | #define IsConsoleHandle(h) (((intptr_t) (h) & 3) == 3)
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| 38 |
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| 39 | #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
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| 40 | static inline int
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| 41 | _isatty_nothrow (int fd)
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| 42 | {
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| 43 | int result;
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| 44 |
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| 45 | TRY_MSVC_INVAL
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| 46 | {
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| 47 | result = _isatty (fd);
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| 48 | }
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| 49 | CATCH_MSVC_INVAL
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| 50 | {
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| 51 | result = 0;
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| 52 | }
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| 53 | DONE_MSVC_INVAL;
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| 54 |
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| 55 | return result;
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| 56 | }
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| 57 | #else
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| 58 | # define _isatty_nothrow _isatty
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| 59 | #endif
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| 60 |
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| 61 | /* Determine whether FD refers to a console device. Return 1 if yes.
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| 62 | Return 0 and set errno if no. (ptsname_r relies on the errno value.) */
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| 63 | int
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| 64 | isatty (int fd)
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| 65 | {
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| 66 | HANDLE h = (HANDLE) _get_osfhandle (fd);
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| 67 | if (h == INVALID_HANDLE_VALUE)
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| 68 | {
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| 69 | errno = EBADF;
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| 70 | return 0;
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| 71 | }
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| 72 | /* _isatty (fd) tests whether GetFileType of the handle is FILE_TYPE_CHAR.
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| 73 | But it does not set errno when it returns 0. */
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| 74 | if (_isatty_nothrow (fd))
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| 75 | {
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| 76 | if (IsConsoleHandle (h))
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| 77 | return 1;
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| 78 | }
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| 79 | errno = ENOTTY;
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| 80 | return 0;
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| 81 | }
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