1: /* POSIX compatible FILE stream write function.
2: Copyright (C) 2008-2011 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 '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 __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_NONBLOCKING
43: # define CLEAR_ERRNO \
44: errno = 0;
45: # define HANDLE_ENOSPC \
46: if (errno == ENOSPC && ferror (stream)) \
47: { \
48: int fd = fileno (stream); \
49: if (fd >= 0) \
50: { \
51: HANDLE h = (HANDLE) _get_osfhandle (fd); \
52: if (GetFileType (h) == FILE_TYPE_PIPE) \
53: { \
54: /* h is a pipe or socket. */ \
55: DWORD state; \
56: if (GetNamedPipeHandleState (h, &state, NULL, NULL, \
57: NULL, NULL, 0) \
58: && (state & PIPE_NOWAIT) != 0) \
59: /* h is a pipe in non-blocking mode. \
60: Change errno from ENOSPC to EAGAIN. */ \
61: errno = EAGAIN; \
62: } \
63: } \
64: } \
65: else
66: # else
67: # define CLEAR_ERRNO
68: # define HANDLE_ENOSPC
69: # endif
70:
71: # if GNULIB_SIGPIPE
72: # define CLEAR_LastError \
73: SetLastError (0);
74: # define HANDLE_ERROR_NO_DATA \
75: if (GetLastError () == ERROR_NO_DATA && ferror (stream)) \
76: { \
77: int fd = fileno (stream); \
78: if (fd >= 0 \
79: && GetFileType ((HANDLE) _get_osfhandle (fd)) \
80: == FILE_TYPE_PIPE) \
81: { \
82: /* Try to raise signal SIGPIPE. */ \
83: raise (SIGPIPE); \
84: /* If it is currently blocked or ignored, change errno from \
85: EINVAL to EPIPE. */ \
86: errno = EPIPE; \
87: } \
88: } \
89: else
90: # else
91: # define CLEAR_LastError
92: # define HANDLE_ERROR_NO_DATA
93: # endif
94:
95: # define CALL_WITH_SIGPIPE_EMULATION(RETTYPE, EXPRESSION, FAILED) \
96: if (ferror (stream)) \
97: return (EXPRESSION); \
98: else \
99: { \
100: RETTYPE ret; \
101: CLEAR_ERRNO \
102: CLEAR_LastError \
103: ret = (EXPRESSION); \
104: if (FAILED) \
105: { \
106: HANDLE_ENOSPC \
107: HANDLE_ERROR_NO_DATA \
108: ; \
109: } \
110: return ret; \
111: }
112:
113: # if !REPLACE_PRINTF_POSIX /* avoid collision with printf.c */
114: int
115: printf (const char *format, ...)
116: {
117: int retval;
118: va_list args;
119:
120: va_start (args, format);
121: retval = vfprintf (stdout, format, args);
122: va_end (args);
123:
124: return retval;
125: }
126: # endif
127:
128: # if !REPLACE_FPRINTF_POSIX /* avoid collision with fprintf.c */
129: int
130: fprintf (FILE *stream, const char *format, ...)
131: {
132: int retval;
133: va_list args;
134:
135: va_start (args, format);
136: retval = vfprintf (stream, format, args);
137: va_end (args);
138:
139: return retval;
140: }
141: # endif
142:
143: # if !REPLACE_VPRINTF_POSIX /* avoid collision with vprintf.c */
144: int
145: vprintf (const char *format, va_list args)
146: {
147: return vfprintf (stdout, format, args);
148: }
149: # endif
150:
151: # if !REPLACE_VFPRINTF_POSIX /* avoid collision with vfprintf.c */
152: int
153: vfprintf (FILE *stream, const char *format, va_list args)
154: #undef vfprintf
155: {
156: CALL_WITH_SIGPIPE_EMULATION (int, vfprintf (stream, format, args), ret == EOF)
157: }
158: # endif
159:
160: int
161: putchar (int c)
162: {
163: return fputc (c, stdout);
164: }
165:
166: int
167: fputc (int c, FILE *stream)
168: #undef fputc
169: {
170: CALL_WITH_SIGPIPE_EMULATION (int, fputc (c, stream), ret == EOF)
171: }
172:
173: int
174: fputs (const char *string, FILE *stream)
175: #undef fputs
176: {
177: CALL_WITH_SIGPIPE_EMULATION (int, fputs (string, stream), ret == EOF)
178: }
179:
180: int
181: puts (const char *string)
182: #undef puts
183: {
184: FILE *stream = stdout;
185: CALL_WITH_SIGPIPE_EMULATION (int, puts (string), ret == EOF)
186: }
187:
188: size_t
189: fwrite (const void *ptr, size_t s, size_t n, FILE *stream)
190: #undef fwrite
191: {
192: CALL_WITH_SIGPIPE_EMULATION (size_t, fwrite (ptr, s, n, stream), ret < n)
193: }
194:
195: # endif
196: #endif
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