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-rw-r--r--lib/stdio-write.c206
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diff --git a/lib/stdio-write.c b/lib/stdio-write.c
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+++ b/lib/stdio-write.c
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+/* POSIX compatible FILE stream write function.
+ Copyright (C) 2008-2020 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2008.
+
+ 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 <stdio.h>
+
+/* Replace these functions only if module 'nonblocking' or module 'sigpipe' is
+ requested. */
+#if GNULIB_NONBLOCKING || GNULIB_SIGPIPE
+
+/* On native Windows platforms, SIGPIPE does not exist. When write() is
+ called on a pipe with no readers, WriteFile() fails with error
+ GetLastError() = ERROR_NO_DATA, and write() in consequence fails with
+ error EINVAL. This write() function is at the basis of the function
+ which flushes the buffer of a FILE stream. */
+
+# if defined _WIN32 && ! defined __CYGWIN__
+
+# include <errno.h>
+# include <signal.h>
+# include <io.h>
+
+# define WIN32_LEAN_AND_MEAN /* avoid including junk */
+# include <windows.h>
+
+# if GNULIB_MSVC_NOTHROW
+# include "msvc-nothrow.h"
+# else
+# include <io.h>
+# endif
+
+/* Don't assume that UNICODE is not defined. */
+# undef GetNamedPipeHandleState
+# define GetNamedPipeHandleState GetNamedPipeHandleStateA
+
+# if GNULIB_NONBLOCKING
+# define CLEAR_ERRNO \
+ errno = 0;
+# define HANDLE_ENOSPC \
+ if (errno == ENOSPC && ferror (stream)) \
+ { \
+ int fd = fileno (stream); \
+ if (fd >= 0) \
+ { \
+ HANDLE h = (HANDLE) _get_osfhandle (fd); \
+ if (GetFileType (h) == FILE_TYPE_PIPE) \
+ { \
+ /* h is a pipe or socket. */ \
+ DWORD state; \
+ if (GetNamedPipeHandleState (h, &state, NULL, NULL, \
+ NULL, NULL, 0) \
+ && (state & PIPE_NOWAIT) != 0) \
+ /* h is a pipe in non-blocking mode. \
+ Change errno from ENOSPC to EAGAIN. */ \
+ errno = EAGAIN; \
+ } \
+ } \
+ } \
+ else
+# else
+# define CLEAR_ERRNO
+# define HANDLE_ENOSPC
+# endif
+
+# if GNULIB_SIGPIPE
+# define CLEAR_LastError \
+ SetLastError (0);
+# define HANDLE_ERROR_NO_DATA \
+ if (GetLastError () == ERROR_NO_DATA && ferror (stream)) \
+ { \
+ int fd = fileno (stream); \
+ if (fd >= 0 \
+ && GetFileType ((HANDLE) _get_osfhandle (fd)) \
+ == FILE_TYPE_PIPE) \
+ { \
+ /* Try to raise signal SIGPIPE. */ \
+ raise (SIGPIPE); \
+ /* If it is currently blocked or ignored, change errno from \
+ EINVAL to EPIPE. */ \
+ errno = EPIPE; \
+ } \
+ } \
+ else
+# else
+# define CLEAR_LastError
+# define HANDLE_ERROR_NO_DATA
+# endif
+
+# define CALL_WITH_SIGPIPE_EMULATION(RETTYPE, EXPRESSION, FAILED) \
+ if (ferror (stream)) \
+ return (EXPRESSION); \
+ else \
+ { \
+ RETTYPE ret; \
+ CLEAR_ERRNO \
+ CLEAR_LastError \
+ ret = (EXPRESSION); \
+ if (FAILED) \
+ { \
+ HANDLE_ENOSPC \
+ HANDLE_ERROR_NO_DATA \
+ ; \
+ } \
+ return ret; \
+ }
+
+# if !REPLACE_PRINTF_POSIX /* avoid collision with printf.c */
+int
+printf (const char *format, ...)
+{
+ int retval;
+ va_list args;
+
+ va_start (args, format);
+ retval = vfprintf (stdout, format, args);
+ va_end (args);
+
+ return retval;
+}
+# endif
+
+# if !REPLACE_FPRINTF_POSIX /* avoid collision with fprintf.c */
+int
+fprintf (FILE *stream, const char *format, ...)
+{
+ int retval;
+ va_list args;
+
+ va_start (args, format);
+ retval = vfprintf (stream, format, args);
+ va_end (args);
+
+ return retval;
+}
+# endif
+
+# if !REPLACE_VPRINTF_POSIX /* avoid collision with vprintf.c */
+int
+vprintf (const char *format, va_list args)
+{
+ return vfprintf (stdout, format, args);
+}
+# endif
+
+# if !REPLACE_VFPRINTF_POSIX /* avoid collision with vfprintf.c */
+int
+vfprintf (FILE *stream, const char *format, va_list args)
+#undef vfprintf
+{
+ CALL_WITH_SIGPIPE_EMULATION (int, vfprintf (stream, format, args), ret == EOF)
+}
+# endif
+
+int
+putchar (int c)
+{
+ return fputc (c, stdout);
+}
+
+int
+fputc (int c, FILE *stream)
+#undef fputc
+{
+ CALL_WITH_SIGPIPE_EMULATION (int, fputc (c, stream), ret == EOF)
+}
+
+int
+fputs (const char *string, FILE *stream)
+#undef fputs
+{
+ CALL_WITH_SIGPIPE_EMULATION (int, fputs (string, stream), ret == EOF)
+}
+
+int
+puts (const char *string)
+#undef puts
+{
+ FILE *stream = stdout;
+ CALL_WITH_SIGPIPE_EMULATION (int, puts (string), ret == EOF)
+}
+
+size_t
+fwrite (const void *ptr, size_t s, size_t n, FILE *stream)
+#undef fwrite
+{
+ CALL_WITH_SIGPIPE_EMULATION (size_t, fwrite (ptr, s, n, stream), ret < n)
+}
+
+# endif
+#endif