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annotate packages/language/c/libc/stdio/current/src/common/fflush.cxx @ 171:42f843b391aa

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Merge from eCos master repository on 2001-07-18-03:13:25-BST
author jlarmour
date Wed, 18 Jul 2001 11:38:39 +0000
parents 6ed91473a1cd
children 38892b97b685
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1 //========================================================================
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2 //
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3 // fflush.cxx
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4 //
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5 // Implementation of C library file flush function as per ANSI 7.9.5.2
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6 //
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7 //========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors:
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36 // Date: 2000-04-20
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37 // Purpose: Provides ISO C fflush() function
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38 // Description:
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39 // Usage:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //========================================================================
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44
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45 // CONFIGURATION
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46
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47 #include <pkgconf/libc_stdio.h> // Configuration header
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48
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49 // INCLUDES
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50
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51 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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52 #include <stddef.h> // NULL and size_t from compiler
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53 #include <errno.h> // Error codes
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54 #include <stdio.h> // header for fflush()
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55 #include <cyg/libc/stdio/stream.hxx>// C library streams
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56 #include <cyg/libc/stdio/stdiofiles.hxx> // C library files
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57 #include <cyg/libc/stdio/stdiosupp.hxx> // support for stdio
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58
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59 // FUNCTIONS
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60
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61 // flush all but one stream
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62 externC Cyg_ErrNo
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63 cyg_libc_stdio_flush_all_but( Cyg_StdioStream *not_this_stream )
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64 {
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65 cyg_bool files_flushed[FOPEN_MAX] = { false }; // sets all to 0
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66 cyg_bool loop_again;
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67 cyg_ucount32 i;
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68 Cyg_ErrNo err=ENOERR;
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69 Cyg_StdioStream *stream;
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70
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71 do {
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72 loop_again = false;
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73
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74 for (i=0; (i<FOPEN_MAX) && !err; i++) {
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75 if (files_flushed[i] == false) {
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76
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77 stream = Cyg_libc_stdio_files::get_file_stream(i);
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78
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79 if ((stream == NULL) || (stream == not_this_stream)) {
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80 // if it isn't a valid stream, set its entry in the
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81 // list of files flushed since we don't want to
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82 // flush it
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83 // Ditto if its the one we're meant to miss
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84
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85 files_flushed[i] = true;
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86 } // if
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87 else {
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88 // valid stream
171
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89 // only buffers which we've written to need flushing
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90 if ( !stream->flags.last_buffer_op_was_read) {
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91 if ( stream->trylock_me() ) {
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92 err = stream->flush_output_unlocked();
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93 stream->unlock_me();
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94 files_flushed[i] = true;
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95 } // if
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96 else
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97 loop_again = true;
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98 }
115
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99 } // else
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100 } // if
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101 } // for
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102 } // do
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103 while(loop_again && !err);
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104
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105 return err;
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106 } // cyg_libc_stdio_flush_all_but()
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107
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108 externC int
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109 fflush( FILE *stream )
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110 {
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111 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
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112 Cyg_ErrNo err;
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113
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114 if (stream == NULL) { // tells us to flush ALL streams
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115 err = cyg_libc_stdio_flush_all_but(NULL);
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116 } // if
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117 else {
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118 err = real_stream->flush_output();
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119 } // else
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120
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121 if (err) {
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122 errno = err;
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123 return EOF;
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124 } // if
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125
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126 return 0;
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127
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128 } // fflush()
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129
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130 // EOF fflush.cxx