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62d6c33030
When casting between a pointer and an integer of a different size, GCC emits a warning (which is escalated to a build failure by -Werror). Indeed, if what you start with is a pointer, which you then cast to a shorter integer and then back again, you're going to cut off some bits of the pointer. But if you start with an integer (such as mach_port_t), then cast it to a longer pointer (void *), and then back to a shorter integer, you are fine. To keep GCC happy, cast through an intermediary uintptr_t, which is always the same size as a pointer. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230212111044.610942-4-bugaevc@gmail.com>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* Copyright (C) 1991-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <hurd.h>
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#include <libioP.h>
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static ssize_t
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do_write (void *cookie, const char *buf, size_t n)
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{
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io_t io = (io_t) (uintptr_t) cookie;
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vm_size_t amount = n;
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error_t error = __io_write (io, buf, n, -1, &amount);
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if (error)
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return __hurd_fail (error);
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return n;
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}
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/* Write formatted output to PORT, a Mach port supporting the i/o protocol,
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according to the format string FORMAT, using the argument list in ARG. */
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int
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vpprintf (io_t port, const char *format, va_list arg)
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{
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int done;
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struct locked_FILE
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{
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struct _IO_cookie_file cfile;
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#ifdef _IO_MTSAFE_IO
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_IO_lock_t lock;
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#endif
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} temp_f;
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#ifdef _IO_MTSAFE_IO
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temp_f.cfile.__fp.file._lock = &temp_f.lock;
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#endif
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_IO_cookie_init (&temp_f.cfile, _IO_NO_READS,
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(void *) (uintptr_t) port,
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(cookie_io_functions_t) { write: do_write });
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done = __vfprintf_internal (&temp_f.cfile.__fp.file, format, arg, 0);
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return done;
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}
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