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c4b681fd | 1 | /* POSIX compatible FILE stream write function. |
61cd9dc9 | 2 | Copyright (C) 2008-2010 Free Software Foundation, Inc. |
c4b681fd LC |
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 Lesser 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 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 <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) \ | |
1cd4fffc LC |
42 | if (ferror (stream)) \ |
43 | return (EXPRESSION); \ | |
44 | else \ | |
45 | { \ | |
46 | RETTYPE ret; \ | |
47 | SetLastError (0); \ | |
48 | ret = (EXPRESSION); \ | |
c4b681fd | 49 | if (FAILED && GetLastError () == ERROR_NO_DATA && ferror (stream)) \ |
1cd4fffc LC |
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; \ | |
c4b681fd LC |
63 | } |
64 | ||
65 | # if !REPLACE_PRINTF_POSIX /* avoid collision with printf.c */ | |
66 | int | |
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 | |
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 | ||
8912421c | 95 | # if !REPLACE_VPRINTF_POSIX /* avoid collision with vprintf.c */ |
c4b681fd LC |
96 | int |
97 | vprintf (const char *format, va_list args) | |
98 | { | |
99 | return vfprintf (stdout, format, args); | |
100 | } | |
101 | # endif | |
102 | ||
8912421c | 103 | # if !REPLACE_VFPRINTF_POSIX /* avoid collision with vfprintf.c */ |
c4b681fd LC |
104 | int |
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 | |
113 | putchar (int c) | |
114 | { | |
115 | return fputc (c, stdout); | |
116 | } | |
117 | ||
118 | int | |
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 | |
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 | |
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 | |
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 |