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-rw-r--r--gl/stdio-write.c206
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diff --git a/gl/stdio-write.c b/gl/stdio-write.c
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1/* POSIX compatible FILE stream write function.
2 Copyright (C) 2008-2023 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2008.
4
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 This file is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18#include <config.h>
19
20/* Specification. */
21#include <stdio.h>
22
23/* Replace these functions only if module 'nonblocking' or module 'sigpipe' is
24 requested. */
25#if GNULIB_NONBLOCKING || GNULIB_SIGPIPE
26
27/* On native Windows platforms, SIGPIPE does not exist. When write() is
28 called on a pipe with no readers, WriteFile() fails with error
29 GetLastError() = ERROR_NO_DATA, and write() in consequence fails with
30 error EINVAL. This write() function is at the basis of the function
31 which flushes the buffer of a FILE stream. */
32
33# if defined _WIN32 && ! defined __CYGWIN__
34
35# include <errno.h>
36# include <signal.h>
37# include <io.h>
38
39# define WIN32_LEAN_AND_MEAN /* avoid including junk */
40# include <windows.h>
41
42# if GNULIB_MSVC_NOTHROW
43# include "msvc-nothrow.h"
44# else
45# include <io.h>
46# endif
47
48/* Don't assume that UNICODE is not defined. */
49# undef GetNamedPipeHandleState
50# define GetNamedPipeHandleState GetNamedPipeHandleStateA
51
52# if GNULIB_NONBLOCKING
53# define CLEAR_ERRNO \
54 errno = 0;
55# define HANDLE_ENOSPC \
56 if (errno == ENOSPC && ferror (stream)) \
57 { \
58 int fd = fileno (stream); \
59 if (fd >= 0) \
60 { \
61 HANDLE h = (HANDLE) _get_osfhandle (fd); \
62 if (GetFileType (h) == FILE_TYPE_PIPE) \
63 { \
64 /* h is a pipe or socket. */ \
65 DWORD state; \
66 if (GetNamedPipeHandleState (h, &state, NULL, NULL, \
67 NULL, NULL, 0) \
68 && (state & PIPE_NOWAIT) != 0) \
69 /* h is a pipe in non-blocking mode. \
70 Change errno from ENOSPC to EAGAIN. */ \
71 errno = EAGAIN; \
72 } \
73 } \
74 } \
75 else
76# else
77# define CLEAR_ERRNO
78# define HANDLE_ENOSPC
79# endif
80
81# if GNULIB_SIGPIPE
82# define CLEAR_LastError \
83 SetLastError (0);
84# define HANDLE_ERROR_NO_DATA \
85 if (GetLastError () == ERROR_NO_DATA && ferror (stream)) \
86 { \
87 int fd = fileno (stream); \
88 if (fd >= 0 \
89 && GetFileType ((HANDLE) _get_osfhandle (fd)) \
90 == FILE_TYPE_PIPE) \
91 { \
92 /* Try to raise signal SIGPIPE. */ \
93 raise (SIGPIPE); \
94 /* If it is currently blocked or ignored, change errno from \
95 EINVAL to EPIPE. */ \
96 errno = EPIPE; \
97 } \
98 } \
99 else
100# else
101# define CLEAR_LastError
102# define HANDLE_ERROR_NO_DATA
103# endif
104
105# define CALL_WITH_SIGPIPE_EMULATION(RETTYPE, EXPRESSION, FAILED) \
106 if (ferror (stream)) \
107 return (EXPRESSION); \
108 else \
109 { \
110 RETTYPE ret; \
111 CLEAR_ERRNO \
112 CLEAR_LastError \
113 ret = (EXPRESSION); \
114 if (FAILED) \
115 { \
116 HANDLE_ENOSPC \
117 HANDLE_ERROR_NO_DATA \
118 ; \
119 } \
120 return ret; \
121 }
122
123# if !REPLACE_PRINTF_POSIX /* avoid collision with printf.c */
124int
125printf (const char *format, ...)
126{
127 int retval;
128 va_list args;
129
130 va_start (args, format);
131 retval = vfprintf (stdout, format, args);
132 va_end (args);
133
134 return retval;
135}
136# endif
137
138# if !REPLACE_FPRINTF_POSIX /* avoid collision with fprintf.c */
139int
140fprintf (FILE *stream, const char *format, ...)
141{
142 int retval;
143 va_list args;
144
145 va_start (args, format);
146 retval = vfprintf (stream, format, args);
147 va_end (args);
148
149 return retval;
150}
151# endif
152
153# if !REPLACE_VPRINTF_POSIX /* avoid collision with vprintf.c */
154int
155vprintf (const char *format, va_list args)
156{
157 return vfprintf (stdout, format, args);
158}
159# endif
160
161# if !REPLACE_VFPRINTF_POSIX /* avoid collision with vfprintf.c */
162int
163vfprintf (FILE *stream, const char *format, va_list args)
164#undef vfprintf
165{
166 CALL_WITH_SIGPIPE_EMULATION (int, vfprintf (stream, format, args), ret == EOF)
167}
168# endif
169
170int
171putchar (int c)
172{
173 return fputc (c, stdout);
174}
175
176int
177fputc (int c, FILE *stream)
178#undef fputc
179{
180 CALL_WITH_SIGPIPE_EMULATION (int, fputc (c, stream), ret == EOF)
181}
182
183int
184fputs (const char *string, FILE *stream)
185#undef fputs
186{
187 CALL_WITH_SIGPIPE_EMULATION (int, fputs (string, stream), ret == EOF)
188}
189
190int
191puts (const char *string)
192#undef puts
193{
194 FILE *stream = stdout;
195 CALL_WITH_SIGPIPE_EMULATION (int, puts (string), ret == EOF)
196}
197
198size_t
199fwrite (const void *ptr, size_t s, size_t n, FILE *stream)
200#undef fwrite
201{
202 CALL_WITH_SIGPIPE_EMULATION (size_t, fwrite (ptr, s, n, stream), ret < n)
203}
204
205# endif
206#endif