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annotate lib/stdio-read.c @ 17616:cae23a655793

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author Karl Berry <karl@freefriends.org>
date Sat, 25 Jan 2014 06:40:43 -0800 (2014-01-25)
parents 344018b6e5d7
children
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1 /* POSIX compatible FILE stream read function.
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2 Copyright (C) 2008-2014 Free Software Foundation, Inc.
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3 Written by Bruno Haible <bruno@clisp.org>, 2011.
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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 'nonblocking' is requested. */
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24 #if GNULIB_NONBLOCKING
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25
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26 /* On native Windows platforms, when read() is called on a non-blocking pipe
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27 with an empty buffer, ReadFile() fails with error GetLastError() =
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28 ERROR_NO_DATA, and read() in consequence fails with error EINVAL. This
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29 read() function is at the basis of the function which fills the buffer of
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30 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 <io.h>
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36
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37 # define WIN32_LEAN_AND_MEAN /* avoid including junk */
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38 # include <windows.h>
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39
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40 # include "msvc-nothrow.h"
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41
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42 # define CALL_WITH_ERRNO_FIX(RETTYPE, EXPRESSION, FAILED) \
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43 if (ferror (stream)) \
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44 return (EXPRESSION); \
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45 else \
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46 { \
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47 RETTYPE ret; \
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48 SetLastError (0); \
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49 ret = (EXPRESSION); \
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50 if (FAILED) \
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51 { \
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52 if (GetLastError () == ERROR_NO_DATA && ferror (stream)) \
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53 { \
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54 int fd = fileno (stream); \
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55 if (fd >= 0) \
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56 { \
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57 HANDLE h = (HANDLE) _get_osfhandle (fd); \
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58 if (GetFileType (h) == FILE_TYPE_PIPE) \
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59 { \
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60 /* h is a pipe or socket. */ \
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61 DWORD state; \
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62 if (GetNamedPipeHandleState (h, &state, NULL, NULL, \
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63 NULL, NULL, 0) \
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64 && (state & PIPE_NOWAIT) != 0) \
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65 /* h is a pipe in non-blocking mode. \
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66 Change errno from EINVAL to EAGAIN. */ \
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67 errno = EAGAIN; \
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68 } \
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69 } \
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70 } \
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71 } \
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72 return ret; \
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73 }
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74
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75 /* Enable this function definition only if gnulib's <stdio.h> has prepared it.
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76 Otherwise we get a function definition conflict with mingw64's <stdio.h>. */
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77 # if GNULIB_SCANF
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78 int
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79 scanf (const char *format, ...)
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80 {
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81 int retval;
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82 va_list args;
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83
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84 va_start (args, format);
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85 retval = vfscanf (stdin, format, args);
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86 va_end (args);
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87
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88 return retval;
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89 }
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90 # endif
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91
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92 /* Enable this function definition only if gnulib's <stdio.h> has prepared it.
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93 Otherwise we get a function definition conflict with mingw64's <stdio.h>. */
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94 # if GNULIB_FSCANF
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95 int
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96 fscanf (FILE *stream, const char *format, ...)
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97 {
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98 int retval;
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99 va_list args;
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100
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101 va_start (args, format);
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102 retval = vfscanf (stream, format, args);
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103 va_end (args);
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104
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105 return retval;
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106 }
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107 # endif
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108
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109 /* Enable this function definition only if gnulib's <stdio.h> has prepared it.
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110 Otherwise we get a function definition conflict with mingw64's <stdio.h>. */
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111 # if GNULIB_VSCANF
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112 int
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113 vscanf (const char *format, va_list args)
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114 {
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115 return vfscanf (stdin, format, args);
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116 }
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117 # endif
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118
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119 /* Enable this function definition only if gnulib's <stdio.h> has prepared it.
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120 Otherwise we get a function definition conflict with mingw64's <stdio.h>. */
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121 # if GNULIB_VFSCANF
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122 int
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123 vfscanf (FILE *stream, const char *format, va_list args)
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124 #undef vfscanf
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125 {
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126 CALL_WITH_ERRNO_FIX (int, vfscanf (stream, format, args), ret == EOF)
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127 }
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128 # endif
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129
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130 int
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131 getchar (void)
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132 {
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133 return fgetc (stdin);
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134 }
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135
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136 int
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137 fgetc (FILE *stream)
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138 #undef fgetc
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139 {
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140 CALL_WITH_ERRNO_FIX (int, fgetc (stream), ret == EOF)
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141 }
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142
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143 char *
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144 fgets (char *s, int n, FILE *stream)
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145 #undef fgets
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146 {
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147 CALL_WITH_ERRNO_FIX (char *, fgets (s, n, stream), ret == NULL)
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148 }
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149
16727
683cbe4ca79d stdio: don't assume gets any more
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150 /* We intentionally don't bother to fix gets. */
14583
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151
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152 size_t
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153 fread (void *ptr, size_t s, size_t n, FILE *stream)
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154 #undef fread
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155 {
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156 CALL_WITH_ERRNO_FIX (size_t, fread (ptr, s, n, stream), ret < n)
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157 }
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158
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159 # endif
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160 #endif