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annotate packages/language/c/libc/stdio/current/src/common/setvbuf.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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1 //===========================================================================
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2 //
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3 // setvbuf.cxx
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4 //
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5 // Implementation of C library buffering setup as per ANSI 7.9.5.6
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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:
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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
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50 // INCLUDES
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51
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52 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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53 #include <stddef.h> // NULL and size_t from compiler
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54 #include <errno.h> // Error codes
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55 #include <stdio.h> // header for setvbuf()
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56 #include <cyg/libc/stdio/stream.hxx>// C libray streams
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57
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58 // FUNCTIONS
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59
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60
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61 externC int
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62 setvbuf( FILE *stream, char *buf, int mode, size_t size )
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63 {
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64 #ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
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65
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66 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
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67 Cyg_ErrNo err;
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68
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69 #ifdef CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS
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70 if ( !real_stream->lock_me() ) {
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71 errno = EBADF;
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72 return EBADF;
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73 } // if
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74 #endif
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75
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76 err = real_stream->io_buf.set_buffer( (cyg_ucount32) size,
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77 (cyg_uint8 *) buf );
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78 if (!err) {
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79 switch (mode) {
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80 case _IONBF:
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81 CYG_ASSERT( (size == 0) && (buf == NULL),
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82 "No buffering wanted but size/address specified!" );
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83 real_stream->flags.buffering = false;
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84 real_stream->flags.line_buffering = false;
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85 break;
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86 case _IOLBF:
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87 real_stream->flags.buffering = true;
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88 real_stream->flags.line_buffering = true;
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89 break;
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90 case _IOFBF:
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91 real_stream->flags.buffering = true;
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92 real_stream->flags.line_buffering = false;
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93 break;
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94 default:
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95 err = EINVAL;
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96 break;
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97 } // switch
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98 } // if
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99
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100 #ifdef CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS
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101 real_stream->unlock_me();
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102 #endif
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103
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104 if (err) {
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105 errno = err;
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106 return err;
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107 } // if
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108
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109 return 0;
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110
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111 #else // ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
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112
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113 errno = ENOSUPP;
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114 return ENOSUPP;
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115
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116 #endif // ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
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117
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118 } // setvbuf()
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119
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120 // EOF setvbuf.cxx