1 /* POSIX compatible FILE stream write function.
2 Copyright (C) 2008 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2008.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program 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 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #include <config.h>
19
20 /* Specification. */
21 #include <stdio.h>
22
23 /* Replace these functions only if module 'sigpipe' is requested. */
24 #if GNULIB_SIGPIPE
25
26 /* On native Windows platforms, SIGPIPE does not exist. When write() is
27 called on a pipe with no readers, WriteFile() fails with error
28 GetLastError() = ERROR_NO_DATA, and write() in consequence fails with
29 error EINVAL. This write() function is at the basis of the function
30 which flushes the buffer of a FILE stream. */
31
32 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
33
34 # include <errno.h>
35 # include <signal.h>
36 # include <io.h>
37
38 # define WIN32_LEAN_AND_MEAN /* avoid including junk */
39 # include <windows.h>
40
41 # define CALL_WITH_SIGPIPE_EMULATION(RETTYPE, EXPRESSION, FAILED) \
42 if (ferror (stream)) \
43 return (EXPRESSION); \
44 else \
45 { \
46 RETTYPE ret; \
47 SetLastError (0); \
48 ret = (EXPRESSION); \
49 if (FAILED && GetLastError () == ERROR_NO_DATA && ferror (stream)) \
50 { \
51 int fd = fileno (stream); \
52 if (fd >= 0 \
53 && GetFileType ((HANDLE) _get_osfhandle (fd)) == FILE_TYPE_PIPE)\
54 { \
55 /* Try to raise signal SIGPIPE. */ \
56 raise (SIGPIPE); \
57 /* If it is currently blocked or ignored, change errno from \
58 EINVAL to EPIPE. */ \
59 errno = EPIPE; \
60 } \
61 } \
62 return ret; \
63 }
64
65 # if !REPLACE_PRINTF_POSIX /* avoid collision with printf.c */
66 int
printf(const char * format,...)67 printf (const char *format, ...)
68 {
69 int retval;
70 va_list args;
71
72 va_start (args, format);
73 retval = vfprintf (stdout, format, args);
74 va_end (args);
75
76 return retval;
77 }
78 # endif
79
80 # if !REPLACE_FPRINTF_POSIX /* avoid collision with fprintf.c */
81 int
fprintf(FILE * stream,const char * format,...)82 fprintf (FILE *stream, const char *format, ...)
83 {
84 int retval;
85 va_list args;
86
87 va_start (args, format);
88 retval = vfprintf (stream, format, args);
89 va_end (args);
90
91 return retval;
92 }
93 # endif
94
95 # if !REPLACE_VFPRINTF_POSIX /* avoid collision with vprintf.c */
96 int
vprintf(const char * format,va_list args)97 vprintf (const char *format, va_list args)
98 {
99 return vfprintf (stdout, format, args);
100 }
101 # endif
102
103 # if !REPLACE_VPRINTF_POSIX /* avoid collision with vfprintf.c */
104 int
vfprintf(FILE * stream,const char * format,va_list args)105 vfprintf (FILE *stream, const char *format, va_list args)
106 #undef vfprintf
107 {
108 CALL_WITH_SIGPIPE_EMULATION (int, vfprintf (stream, format, args), ret == EOF)
109 }
110 # endif
111
112 int
putchar(int c)113 putchar (int c)
114 {
115 return fputc (c, stdout);
116 }
117
118 int
fputc(int c,FILE * stream)119 fputc (int c, FILE *stream)
120 #undef fputc
121 {
122 CALL_WITH_SIGPIPE_EMULATION (int, fputc (c, stream), ret == EOF)
123 }
124
125 int
fputs(const char * string,FILE * stream)126 fputs (const char *string, FILE *stream)
127 #undef fputs
128 {
129 CALL_WITH_SIGPIPE_EMULATION (int, fputs (string, stream), ret == EOF)
130 }
131
132 int
puts(const char * string)133 puts (const char *string)
134 #undef puts
135 {
136 FILE *stream = stdout;
137 CALL_WITH_SIGPIPE_EMULATION (int, puts (string), ret == EOF)
138 }
139
140 size_t
fwrite(const void * ptr,size_t s,size_t n,FILE * stream)141 fwrite (const void *ptr, size_t s, size_t n, FILE *stream)
142 #undef fwrite
143 {
144 CALL_WITH_SIGPIPE_EMULATION (size_t, fwrite (ptr, s, n, stream), ret < n)
145 }
146
147 # endif
148 #endif
149