Mercurial > gnulib
view lib/fwritable.c @ 40198:5a34193cbc07
long-options: add parse_gnu_standard_options_only
Discussed in https://bugs.gnu.org/33468 .
* lib/long-options.c (parse_long_options): Use EXIT_SUCCESS instead
of 0.
(parse_gnu_standard_options_only): Add function to
process the GNU default options --help and --version and fail for any other
unknown long or short option. See
https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html .
* lib/long-options.h (parse_gnu_standard_options_only): Declare it.
* modules/long-options (depends-on): Add stdbool, exitfail.
* top/maint.mk (sc_prohibit_long_options_without_use): Update
syntax-check rule, add new function name.
author | Bernhard Voelker <mail@bernhard-voelker.de> |
---|---|
date | Thu, 29 Nov 2018 09:06:26 +0100 |
parents | b06060465f09 |
children |
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/* Retrieve information about a FILE stream. Copyright (C) 2007-2019 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 "fwritable.h" #include "stdio-impl.h" #if defined EPLAN9 /* Plan9 */ # include <fcntl.h> #endif /* This file is not used on systems that have the __fwritable function, namely glibc >= 2.2, Solaris >= 7, Android API >= 23, musl libc. */ bool fwritable (FILE *fp) { /* Most systems provide FILE as a struct and the necessary bitmask in <stdio.h>, because they need it for implementing getc() and putc() as fast macros. */ #if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */ return (fp->_flags & _IO_NO_WRITES) == 0; #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */ return (fp_->_flags & (__SRW | __SWR)) != 0; #elif defined __EMX__ /* emx+gcc */ return (fp->_flags & (_IORW | _IOWRT)) != 0; #elif defined __minix /* Minix */ return (fp->_flags & _IOWRITE) != 0; #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, MSVC, NonStop Kernel, OpenVMS */ return (fp_->_flag & (_IORW | _IOWRT)) != 0; #elif defined __QNX__ /* QNX */ return (fp->_Mode & 0x2 /* _MOPENW */) != 0; #elif defined __MINT__ /* Atari FreeMiNT */ return fp->__mode.__write; #elif defined EPLAN9 /* Plan9 */ int fd = fp->fd; if (fd >= 0) { int flags = fcntl (fd, F_GETFL, NULL); if (flags >= 0) { flags &= O_ACCMODE; return (flags == O_WRONLY || flags == O_RDWR); } } return 0; #else # error "Please port gnulib fwritable.c to your platform! Look at the definition of fopen, fdopen on your system, then report this to bug-gnulib." #endif }