207 lines
7.4 KiB
C
207 lines
7.4 KiB
C
/* POSIX compatible FILE stream write function.
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Copyright (C) 2008-2023 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2008.
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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 <stdio.h>
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/* Replace these functions only if module 'nonblocking' or module 'sigpipe' is
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requested. */
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#if GNULIB_NONBLOCKING || GNULIB_SIGPIPE
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/* On native Windows platforms, SIGPIPE does not exist. When write() is
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called on a pipe with no readers, WriteFile() fails with error
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GetLastError() = ERROR_NO_DATA, and write() in consequence fails with
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error EINVAL. This write() function is at the basis of the function
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which flushes the buffer of a FILE stream. */
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# if defined _WIN32 && ! defined __CYGWIN__
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# include <errno.h>
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# include <signal.h>
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# include <io.h>
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# define WIN32_LEAN_AND_MEAN /* avoid including junk */
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# include <windows.h>
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# if GNULIB_MSVC_NOTHROW
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# include "msvc-nothrow.h"
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# else
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# include <io.h>
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# endif
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/* Don't assume that UNICODE is not defined. */
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# undef GetNamedPipeHandleState
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# define GetNamedPipeHandleState GetNamedPipeHandleStateA
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# if GNULIB_NONBLOCKING
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# define CLEAR_ERRNO \
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errno = 0;
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# define HANDLE_ENOSPC \
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if (errno == ENOSPC && ferror (stream)) \
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{ \
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int fd = fileno (stream); \
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if (fd >= 0) \
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{ \
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HANDLE h = (HANDLE) _get_osfhandle (fd); \
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if (GetFileType (h) == FILE_TYPE_PIPE) \
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{ \
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/* h is a pipe or socket. */ \
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DWORD state; \
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if (GetNamedPipeHandleState (h, &state, NULL, NULL, \
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NULL, NULL, 0) \
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&& (state & PIPE_NOWAIT) != 0) \
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/* h is a pipe in non-blocking mode. \
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Change errno from ENOSPC to EAGAIN. */ \
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errno = EAGAIN; \
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} \
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} \
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} \
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else
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# else
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# define CLEAR_ERRNO
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# define HANDLE_ENOSPC
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# endif
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# if GNULIB_SIGPIPE
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# define CLEAR_LastError \
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SetLastError (0);
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# define HANDLE_ERROR_NO_DATA \
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if (GetLastError () == ERROR_NO_DATA && ferror (stream)) \
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{ \
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int fd = fileno (stream); \
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if (fd >= 0 \
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&& GetFileType ((HANDLE) _get_osfhandle (fd)) \
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== FILE_TYPE_PIPE) \
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{ \
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/* Try to raise signal SIGPIPE. */ \
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raise (SIGPIPE); \
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/* If it is currently blocked or ignored, change errno from \
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EINVAL to EPIPE. */ \
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errno = EPIPE; \
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} \
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} \
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else
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# else
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# define CLEAR_LastError
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# define HANDLE_ERROR_NO_DATA
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# endif
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# define CALL_WITH_SIGPIPE_EMULATION(RETTYPE, EXPRESSION, FAILED) \
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if (ferror (stream)) \
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return (EXPRESSION); \
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else \
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{ \
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RETTYPE ret; \
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CLEAR_ERRNO \
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CLEAR_LastError \
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ret = (EXPRESSION); \
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if (FAILED) \
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{ \
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HANDLE_ENOSPC \
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HANDLE_ERROR_NO_DATA \
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; \
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} \
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return ret; \
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}
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# if !REPLACE_PRINTF_POSIX /* avoid collision with printf.c */
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int
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printf (const char *format, ...)
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{
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int retval;
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va_list args;
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va_start (args, format);
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retval = vfprintf (stdout, format, args);
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va_end (args);
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return retval;
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}
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# endif
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# if !REPLACE_FPRINTF_POSIX /* avoid collision with fprintf.c */
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int
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fprintf (FILE *stream, const char *format, ...)
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{
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int retval;
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va_list args;
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va_start (args, format);
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retval = vfprintf (stream, format, args);
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va_end (args);
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return retval;
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}
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# endif
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# if !REPLACE_VPRINTF_POSIX /* avoid collision with vprintf.c */
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int
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vprintf (const char *format, va_list args)
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{
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return vfprintf (stdout, format, args);
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}
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# endif
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# if !REPLACE_VFPRINTF_POSIX /* avoid collision with vfprintf.c */
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int
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vfprintf (FILE *stream, const char *format, va_list args)
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#undef vfprintf
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{
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CALL_WITH_SIGPIPE_EMULATION (int, vfprintf (stream, format, args), ret == EOF)
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}
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# endif
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int
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putchar (int c)
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{
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return fputc (c, stdout);
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}
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int
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fputc (int c, FILE *stream)
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#undef fputc
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{
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CALL_WITH_SIGPIPE_EMULATION (int, fputc (c, stream), ret == EOF)
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}
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int
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fputs (const char *string, FILE *stream)
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#undef fputs
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{
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CALL_WITH_SIGPIPE_EMULATION (int, fputs (string, stream), ret == EOF)
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}
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int
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puts (const char *string)
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#undef puts
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{
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FILE *stream = stdout;
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CALL_WITH_SIGPIPE_EMULATION (int, puts (string), ret == EOF)
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}
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size_t
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fwrite (const void *ptr, size_t s, size_t n, FILE *stream)
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#undef fwrite
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{
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CALL_WITH_SIGPIPE_EMULATION (size_t, fwrite (ptr, s, n, stream), ret < n)
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}
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# endif
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#endif
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