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* admin/merge-gnulib (GNULIB_MODULES): Add stringeq. With current Gnulib it is already present as in indirect dependency; listing it here because Emacs now depends on it directly. * lib-src/ebrowse.c, lib-src/etags.c: (streq): Remove, as Gnulib defines this now. * lib/fseterr.c, lib/fseterr.h, lib/issymlink.c, lib/issymlink.h: * lib/issymlinkat.c, lib/stdio-consolesafe.c, lib/string.c: * m4/fseterr.m4, m4/gettext_h.m4, m4/stringeq.m4: New files from Gnulib. * src/conf_post.h (tzfree) [__ANDROID_API__ >= 35]: Remove.
84 lines
3 KiB
C
84 lines
3 KiB
C
/* Set the error indicator of a stream.
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Copyright (C) 2007-2025 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include "fseterr.h"
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#include <errno.h>
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#include "stdio-impl.h"
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/* This file is not used on systems that have the __fseterr function,
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namely OpenBSD >= 7.6, musl libc, Haiku >= hrev58760. */
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void
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fseterr (FILE *fp)
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{
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/* Most systems provide FILE as a struct and the necessary bitmask in
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<stdio.h>, because they need it for implementing getc() and putc() as
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fast macros. */
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#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
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/* GNU libc, BeOS, Haiku, Linux libc5 */
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fp->_flags |= _IO_ERR_SEEN;
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#elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
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/* FreeBSD, NetBSD, OpenBSD < 7.6, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
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fp_->_flags |= __SERR;
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#elif defined __EMX__ /* emx+gcc */
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fp->_flags |= _IOERR;
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#elif defined __minix /* Minix */
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fp->_flags |= _IOERR;
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#elif defined _IOERR /* AIX, HP-UX, Solaris, OpenServer, UnixWare, mingw, MSVC, NonStop Kernel, OpenVMS */
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fp_->_flag |= _IOERR;
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#elif defined __UCLIBC__ /* uClibc */
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fp->__modeflags |= __FLAG_ERROR;
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#elif defined __QNX__ /* QNX */
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fp->_Mode |= 0x200 /* _MERR */;
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#elif defined __MINT__ /* Atari FreeMiNT */
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fp->__error = 1;
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#elif defined EPLAN9 /* Plan9 */
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if (fp->state != 0 /* CLOSED */)
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fp->state = 5 /* ERR */;
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#elif 0 /* unknown */
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/* Portable fallback, based on an idea by Rich Felker.
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Wow! 6 system calls for something that is just a bit operation!
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Not activated on any system, because there is no way to repair FP when
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the sequence of system calls fails, and library code should not call
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abort(). */
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int saved_errno;
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int fd;
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int fd2;
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saved_errno = errno;
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fflush (fp);
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fd = fileno (fp);
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fd2 = dup (fd);
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if (fd2 >= 0)
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{
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close (fd);
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fputc ('\0', fp); /* This should set the error indicator. */
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fflush (fp); /* Or this. */
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if (dup2 (fd2, fd) < 0)
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/* Whee... we botched the stream and now cannot restore it! */
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abort ();
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close (fd2);
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}
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errno = saved_errno;
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#else
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#error "Please port gnulib fseterr.c to your platform! Look at the definitions of ferror and clearerr on your system, then report this to bug-gnulib."
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#endif
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}
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