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272
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1 /* POSIX compatible FILE stream write function.
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2 Copyright (C) 2008 Free Software Foundation, Inc.
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3 Written by Bruno Haible <bruno@clisp.org>, 2008.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 #include <config.h>
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19
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20 /* Specification. */
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21 #include <stdio.h>
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22
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23 /* Replace these functions only if module 'sigpipe' is requested. */
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24 #if GNULIB_SIGPIPE
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25
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26 /* On native Windows platforms, SIGPIPE does not exist. When write() is
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27 called on a pipe with no readers, WriteFile() fails with error
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28 GetLastError() = ERROR_NO_DATA, and write() in consequence fails with
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29 error EINVAL. This write() function is at the basis of the function
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30 which flushes the buffer of a FILE stream. */
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31
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32 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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33
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34 # include <errno.h>
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35 # include <signal.h>
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36 # include <io.h>
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37
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38 # define WIN32_LEAN_AND_MEAN /* avoid including junk */
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39 # include <windows.h>
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40
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41 # define CALL_WITH_SIGPIPE_EMULATION(RETTYPE, EXPRESSION, FAILED) \
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42 if (ferror (stream)) \
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43 return (EXPRESSION); \
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44 else \
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45 { \
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46 RETTYPE ret; \
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47 SetLastError (0); \
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48 ret = (EXPRESSION); \
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49 if (FAILED && GetLastError () == ERROR_NO_DATA && ferror (stream)) \
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50 { \
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51 int fd = fileno (stream); \
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52 if (fd >= 0 \
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53 && GetFileType ((HANDLE) _get_osfhandle (fd)) == FILE_TYPE_PIPE)\
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54 { \
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55 /* Try to raise signal SIGPIPE. */ \
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56 raise (SIGPIPE); \
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57 /* If it is currently blocked or ignored, change errno from \
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58 EINVAL to EPIPE. */ \
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59 errno = EPIPE; \
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60 } \
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61 } \
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62 return ret; \
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63 }
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64
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65 # if !REPLACE_PRINTF_POSIX /* avoid collision with printf.c */
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66 int
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67 printf (const char *format, ...)
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68 {
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69 int retval;
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70 va_list args;
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71
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72 va_start (args, format);
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73 retval = vfprintf (stdout, format, args);
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74 va_end (args);
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75
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76 return retval;
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77 }
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78 # endif
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79
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80 # if !REPLACE_FPRINTF_POSIX /* avoid collision with fprintf.c */
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81 int
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82 fprintf (FILE *stream, const char *format, ...)
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83 {
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84 int retval;
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85 va_list args;
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86
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87 va_start (args, format);
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88 retval = vfprintf (stream, format, args);
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89 va_end (args);
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90
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91 return retval;
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92 }
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93 # endif
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94
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95 # if !REPLACE_VFPRINTF_POSIX /* avoid collision with vprintf.c */
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96 int
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97 vprintf (const char *format, va_list args)
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98 {
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99 return vfprintf (stdout, format, args);
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100 }
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101 # endif
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102
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103 # if !REPLACE_VPRINTF_POSIX /* avoid collision with vfprintf.c */
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104 int
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105 vfprintf (FILE *stream, const char *format, va_list args)
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106 #undef vfprintf
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107 {
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108 CALL_WITH_SIGPIPE_EMULATION (int, vfprintf (stream, format, args), ret == EOF)
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109 }
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110 # endif
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111
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112 int
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113 putchar (int c)
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114 {
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115 return fputc (c, stdout);
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116 }
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117
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118 int
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119 fputc (int c, FILE *stream)
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120 #undef fputc
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121 {
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122 CALL_WITH_SIGPIPE_EMULATION (int, fputc (c, stream), ret == EOF)
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123 }
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124
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125 int
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126 fputs (const char *string, FILE *stream)
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127 #undef fputs
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128 {
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129 CALL_WITH_SIGPIPE_EMULATION (int, fputs (string, stream), ret == EOF)
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130 }
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131
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132 int
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133 puts (const char *string)
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134 #undef puts
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135 {
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136 FILE *stream = stdout;
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137 CALL_WITH_SIGPIPE_EMULATION (int, puts (string), ret == EOF)
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138 }
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139
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140 size_t
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141 fwrite (const void *ptr, size_t s, size_t n, FILE *stream)
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142 #undef fwrite
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143 {
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144 CALL_WITH_SIGPIPE_EMULATION (size_t, fwrite (ptr, s, n, stream), ret < n)
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145 }
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146
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147 # endif
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148 #endif
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