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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 18:46:38 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 18:46:38 +0000 |
commit | a06ac93dcf311dac3943cb5d96ad47625d413c2d (patch) | |
tree | 6efda5e24896e7920ccac1f97aecc73406525040 /lib/isatty.c | |
parent | Initial commit. (diff) | |
download | coreutils-a06ac93dcf311dac3943cb5d96ad47625d413c2d.tar.xz coreutils-a06ac93dcf311dac3943cb5d96ad47625d413c2d.zip |
Adding upstream version 8.30.upstream/8.30upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/isatty.c')
-rw-r--r-- | lib/isatty.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/lib/isatty.c b/lib/isatty.c new file mode 100644 index 0000000..b8c8ebb --- /dev/null +++ b/lib/isatty.c @@ -0,0 +1,89 @@ +/* isatty() replacement. + Copyright (C) 2012-2018 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#include <config.h> + +/* Specification. */ +#include <unistd.h> + +/* This replacement is enabled on native Windows. */ + +#include <errno.h> + +/* Get declarations of the Win32 API functions. */ +#define WIN32_LEAN_AND_MEAN +#include <windows.h> + +#if HAVE_MSVC_INVALID_PARAMETER_HANDLER +# include "msvc-inval.h" +#endif + +/* Get _get_osfhandle(). */ +#if GNULIB_MSVC_NOTHROW +# include "msvc-nothrow.h" +#else +# include <io.h> +#endif + +static BOOL IsConsoleHandle (HANDLE h) +{ + DWORD mode; + return GetConsoleMode (h, &mode) != 0; +} + +#if HAVE_MSVC_INVALID_PARAMETER_HANDLER +static int +_isatty_nothrow (int fd) +{ + int result; + + TRY_MSVC_INVAL + { + result = _isatty (fd); + } + CATCH_MSVC_INVAL + { + result = 0; + } + DONE_MSVC_INVAL; + + return result; +} +#else +# define _isatty_nothrow _isatty +#endif + +/* Determine whether FD refers to a console device. Return 1 if yes. + Return 0 and set errno if no. (ptsname_r relies on the errno value.) */ +int +isatty (int fd) +{ + HANDLE h = (HANDLE) _get_osfhandle (fd); + if (h == INVALID_HANDLE_VALUE) + { + errno = EBADF; + return 0; + } + /* _isatty (fd) tests whether GetFileType of the handle is FILE_TYPE_CHAR. + But it does not set errno when it returns 0. */ + if (_isatty_nothrow (fd)) + { + if (IsConsoleHandle (h)) + return 1; + } + errno = ENOTTY; + return 0; +} |