| 1 | /* POSIX compatible FILE stream write function. |
| 2 | Copyright (C) 2008-2009 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 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) \ |
| 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 | # if !DEPENDS_ON_LIBINTL /* avoid collision with intl/printf.c */ |
| 67 | int |
| 68 | printf (const char *format, ...) |
| 69 | { |
| 70 | int retval; |
| 71 | va_list args; |
| 72 | |
| 73 | va_start (args, format); |
| 74 | retval = vfprintf (stdout, format, args); |
| 75 | va_end (args); |
| 76 | |
| 77 | return retval; |
| 78 | } |
| 79 | # endif |
| 80 | # endif |
| 81 | |
| 82 | # if !REPLACE_FPRINTF_POSIX /* avoid collision with fprintf.c */ |
| 83 | int |
| 84 | fprintf (FILE *stream, const char *format, ...) |
| 85 | { |
| 86 | int retval; |
| 87 | va_list args; |
| 88 | |
| 89 | va_start (args, format); |
| 90 | retval = vfprintf (stream, format, args); |
| 91 | va_end (args); |
| 92 | |
| 93 | return retval; |
| 94 | } |
| 95 | # endif |
| 96 | |
| 97 | # if !REPLACE_VPRINTF_POSIX /* avoid collision with vprintf.c */ |
| 98 | int |
| 99 | vprintf (const char *format, va_list args) |
| 100 | { |
| 101 | return vfprintf (stdout, format, args); |
| 102 | } |
| 103 | # endif |
| 104 | |
| 105 | # if !REPLACE_VFPRINTF_POSIX /* avoid collision with vfprintf.c */ |
| 106 | int |
| 107 | vfprintf (FILE *stream, const char *format, va_list args) |
| 108 | #undef vfprintf |
| 109 | { |
| 110 | CALL_WITH_SIGPIPE_EMULATION (int, vfprintf (stream, format, args), ret == EOF) |
| 111 | } |
| 112 | # endif |
| 113 | |
| 114 | int |
| 115 | putchar (int c) |
| 116 | { |
| 117 | return fputc (c, stdout); |
| 118 | } |
| 119 | |
| 120 | int |
| 121 | fputc (int c, FILE *stream) |
| 122 | #undef fputc |
| 123 | { |
| 124 | CALL_WITH_SIGPIPE_EMULATION (int, fputc (c, stream), ret == EOF) |
| 125 | } |
| 126 | |
| 127 | int |
| 128 | fputs (const char *string, FILE *stream) |
| 129 | #undef fputs |
| 130 | { |
| 131 | CALL_WITH_SIGPIPE_EMULATION (int, fputs (string, stream), ret == EOF) |
| 132 | } |
| 133 | |
| 134 | int |
| 135 | puts (const char *string) |
| 136 | #undef puts |
| 137 | { |
| 138 | FILE *stream = stdout; |
| 139 | CALL_WITH_SIGPIPE_EMULATION (int, puts (string), ret == EOF) |
| 140 | } |
| 141 | |
| 142 | size_t |
| 143 | fwrite (const void *ptr, size_t s, size_t n, FILE *stream) |
| 144 | #undef fwrite |
| 145 | { |
| 146 | CALL_WITH_SIGPIPE_EMULATION (size_t, fwrite (ptr, s, n, stream), ret < n) |
| 147 | } |
| 148 | |
| 149 | # endif |
| 150 | #endif |