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annotate packages/language/c/libc/stdio/current/include/streambuf.hxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents b939e9cada46
children d2c90368aeef
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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 //===========================================================================
208
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10 //####ECOSGPLCOPYRIGHTBEGIN####
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11 // -------------------------------------------
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12 // This file is part of eCos, the Embedded Configurable Operating System.
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13 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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14 //
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15 // eCos is free software; you can redistribute it and/or modify it under
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16 // the terms of the GNU General Public License as published by the Free
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17 // Software Foundation; either version 2 or (at your option) any later version.
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18 //
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19 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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20 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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21 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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22 // for more details.
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23 //
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24 // You should have received a copy of the GNU General Public License along
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25 // with eCos; if not, write to the Free Software Foundation, Inc.,
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26 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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27 //
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28 // As a special exception, if other files instantiate templates or use macros
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29 // or inline functions from this file, or you compile this file and link it
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30 // with other works to produce a work based on this file, this file does not
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31 // by itself cause the resulting work to be covered by the GNU General Public
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32 // License. However the source code for this file must still be made available
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33 // in accordance with section (3) of the GNU General Public License.
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34 //
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35 // This exception does not invalidate any other reasons why a work based on
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36 // this file might be covered by the GNU General Public License.
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37 //
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38 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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39 // at http://sources.redhat.com/ecos/ecos-license
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40 // -------------------------------------------
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41 //####ECOSGPLCOPYRIGHTEND####
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42 //===========================================================================
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43 //#####DESCRIPTIONBEGIN####
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44 //
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45 // Author(s): jlarmour
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46 // Contributors:
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47 // Date: 2000-04-19
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48 // Purpose:
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49 // Description: This file implements the buffer class used by Cyg_StdioStream
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50 // for file buffers. It is simple, and not thread-safe - that
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51 // is better done at a higher level for our purposes.
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52 // Usage: #include <cyg/libc/stdio/streambuf.hxx>
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53 //
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54 //####DESCRIPTIONEND####
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55 //
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56 //===========================================================================
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57
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58 // CONFIGURATION
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59
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60 #include <pkgconf/libc_stdio.h> // Configuration header
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61
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62 // Include buffered I/O?
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63 #if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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64
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65
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66 // INCLUDES
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67
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68 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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69 #include <errno.h> // Cyg_ErrNo
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70
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71
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72 // TYPE DEFINITIONS
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73
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74
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75 class Cyg_StdioStreamBuffer
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76 {
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77 private:
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78 // Buffering data
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79
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80 #if defined(CYGSEM_LIBC_STDIO_SETVBUF_MALLOC)
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81 cyg_bool call_free; // should we free the old buffer if set_buffer is
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82 // called?
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83 #else
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84 cyg_uint8 static_buffer[BUFSIZ]; // Static buffer used when we cannot
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85 // use malloc()/free().
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86 #endif
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87
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88 cyg_uint8 *buffer_bottom;
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89
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90 cyg_ucount32 buffer_size;
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91
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92 cyg_uint8 *buffer_top;
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93
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94 cyg_uint8 *current_buffer_position;
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95
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96 public:
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97
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98 // CONSTRUCTORS
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99
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100 // You can change the size, or even supply your own buffer, although
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101 // this only has an effect with dynamic buffers. Otherwise it is
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102 // silently ignored
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103 Cyg_StdioStreamBuffer( cyg_ucount32 size=BUFSIZ,
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104 cyg_uint8 *new_buffer=NULL );
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105
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106
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107 // DESTRUCTORS
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108
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109 ~Cyg_StdioStreamBuffer();
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110
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111 // METHODS
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112
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113 // Set up the buffer. As with the constructor, supplying a new_buffer
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114 // only has an effect with dynamic buffers, although EINVAL is returned
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115 // in that case. ENOMEM may also be returned
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116 Cyg_ErrNo
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117 set_buffer( cyg_ucount32 size=BUFSIZ, cyg_uint8 *new_buffer=NULL );
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118
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119 // Find out how much buffer space is in use
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120 cyg_ucount32
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121 get_buffer_space_used( void );
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122
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123
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124 // What total size is the current buffer set to be. Can be -1 if the
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125 // the buffer is invalid
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126 cyg_count32
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127 get_buffer_size( void );
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128
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129
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130 // get buffer address to read from, and return the number of bytes
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131 // available to read
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132 cyg_ucount32
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133 get_buffer_addr_to_read( cyg_uint8 **buffer );
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134
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135 // when finished reading from said space, tell the buffer how much was
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136 // actually read
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137 void
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138 set_bytes_read( cyg_ucount32 bytes );
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139
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140 // return address of buffer that can be used to write into, and its
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141 // available capacity
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142 cyg_ucount32
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143 get_buffer_addr_to_write( cyg_uint8 **buffer );
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144
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145 // when finished writing into said space, tell the buffer how much was
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146 // actually written
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147 void
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148 set_bytes_written( cyg_ucount32 bytes );
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149
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150 // just empty the whole buffer contents
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151 void
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152 drain_buffer( void );
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153 }; // class Cyg_StdioStreamBuffer
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154
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155 // INLINE FUNCTIONS
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156
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157 #include <cyg/libc/stdio/streambuf.inl>
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158
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159
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160 #endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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161
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162 #endif // CYGONCE_LIBC_STDIO_STREAMBUF_HXX multiple inclusion protection
115
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163
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164 // EOF streambuf.hxx