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annotate packages/language/c/libc/stdio/current/include/streambuf.hxx @ 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 b939e9cada46
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1 #ifndef CYGONCE_LIBC_STDIO_STREAMBUF_HXX
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2 #define CYGONCE_LIBC_STDIO_STREAMBUF_HXX
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3 //===========================================================================
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4 //
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5 // streambuf.hxx
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6 //
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7 // Internal C library stdio stream buffer interface definitions
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8 //
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9 //===========================================================================
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10 //####COPYRIGHTBEGIN####
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11 //
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12 // -------------------------------------------
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13 // The contents of this file are subject to the Red Hat eCos Public License
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14 // Version 1.1 (the "License"); you may not use this file except in
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15 // compliance with the License. You may obtain a copy of the License at
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16 // http://www.redhat.com/
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17 //
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18 // Software distributed under the License is distributed on an "AS IS"
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19 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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20 // License for the specific language governing rights and limitations under
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21 // the License.
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22 //
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23 // The Original Code is eCos - Embedded Configurable Operating System,
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24 // released September 30, 1998.
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25 //
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26 // The Initial Developer of the Original Code is Red Hat.
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27 // Portions created by Red Hat are
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28 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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29 // All Rights Reserved.
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30 // -------------------------------------------
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31 //
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32 //####COPYRIGHTEND####
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33 //===========================================================================
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34 //#####DESCRIPTIONBEGIN####
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35 //
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36 // Author(s): jlarmour
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37 // Contributors:
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38 // Date: 2000-04-19
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39 // Purpose:
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40 // Description: This file implements the buffer class used by Cyg_StdioStream
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41 // for file buffers. It is simple, and not thread-safe - that
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42 // is better done at a higher level for our purposes.
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43 // Usage: #include <cyg/libc/stdio/streambuf.hxx>
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44 //
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45 //####DESCRIPTIONEND####
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46 //
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47 //===========================================================================
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48
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49 // CONFIGURATION
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50
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51 #include <pkgconf/libc_stdio.h> // Configuration header
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52
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53 // Include buffered I/O?
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54 #if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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55
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56
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57 // INCLUDES
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58
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59 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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60 #include <errno.h> // Cyg_ErrNo
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61
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62
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63 // TYPE DEFINITIONS
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64
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65
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66 class Cyg_StdioStreamBuffer
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67 {
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68 private:
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69 // Buffering data
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70
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71 #if defined(CYGSEM_LIBC_STDIO_SETVBUF_MALLOC)
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72 cyg_bool call_free; // should we free the old buffer if set_buffer is
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73 // called?
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74 #else
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75 cyg_uint8 static_buffer[BUFSIZ]; // Static buffer used when we cannot
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76 // use malloc()/free().
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77 #endif
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78
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79 cyg_uint8 *buffer_bottom;
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80
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81 cyg_ucount32 buffer_size;
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82
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83 cyg_uint8 *buffer_top;
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84
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85 cyg_uint8 *current_buffer_position;
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86
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87 public:
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88
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89 // CONSTRUCTORS
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90
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91 // You can change the size, or even supply your own buffer, although
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92 // this only has an effect with dynamic buffers. Otherwise it is
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93 // silently ignored
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94 Cyg_StdioStreamBuffer( cyg_ucount32 size=BUFSIZ,
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95 cyg_uint8 *new_buffer=NULL );
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96
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97
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98 // DESTRUCTORS
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99
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100 ~Cyg_StdioStreamBuffer();
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101
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102 // METHODS
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103
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104 // Set up the buffer. As with the constructor, supplying a new_buffer
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105 // only has an effect with dynamic buffers, although EINVAL is returned
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106 // in that case. ENOMEM may also be returned
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107 Cyg_ErrNo
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108 set_buffer( cyg_ucount32 size=BUFSIZ, cyg_uint8 *new_buffer=NULL );
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109
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110 // Find out how much buffer space is in use
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111 cyg_ucount32
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112 get_buffer_space_used( void );
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113
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114
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115 // What total size is the current buffer set to be. Can be -1 if the
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116 // the buffer is invalid
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117 cyg_count32
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118 get_buffer_size( void );
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119
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120
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121 // get buffer address to read from, and return the number of bytes
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122 // available to read
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123 cyg_ucount32
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124 get_buffer_addr_to_read( cyg_uint8 **buffer );
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125
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126 // when finished reading from said space, tell the buffer how much was
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127 // actually read
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128 void
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129 set_bytes_read( cyg_ucount32 bytes );
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130
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131 // return address of buffer that can be used to write into, and its
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132 // available capacity
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133 cyg_ucount32
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134 get_buffer_addr_to_write( cyg_uint8 **buffer );
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135
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136 // when finished writing into said space, tell the buffer how much was
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137 // actually written
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138 void
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139 set_bytes_written( cyg_ucount32 bytes );
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140
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141 // just empty the whole buffer contents
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142 void
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143 drain_buffer( void );
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144 }; // class Cyg_StdioStreamBuffer
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145
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146 // INLINE FUNCTIONS
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147
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148 #include <cyg/libc/stdio/streambuf.inl>
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149
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150
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151 #endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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152
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153 #endif CYGONCE_LIBC_STDIO_STREAMBUF_HXX multiple inclusion protection
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154
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155 // EOF streambuf.hxx