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annotate packages/language/c/libc/stdio/current/include/streambuf.hxx @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents d2c90368aeef
children
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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 // ####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 Free Software Foundation, 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
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18 // version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT
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21 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License
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26 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use
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30 // macros or inline functions from this file, or you compile this file
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31 // and link it with other works to produce a work based on this file,
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32 // this file does not by itself cause the resulting work to be covered by
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33 // the GNU General Public License. However the source code for this file
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34 // must still be made available in accordance with section (3) of the GNU
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35 // General Public License v2.
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36 //
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37 // This exception does not invalidate any other reasons why a work based
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38 // on this file might be covered by the GNU General Public License.
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39 // -------------------------------------------
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40 // ####ECOSGPLCOPYRIGHTEND####
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41 //===========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): jlarmour
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45 // Contributors:
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46 // Date: 2000-04-19
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47 // Purpose:
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48 // Description: This file implements the buffer class used by Cyg_StdioStream
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49 // for file buffers. It is simple, and not thread-safe - that
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50 // is better done at a higher level for our purposes.
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51 // Usage: #include <cyg/libc/stdio/streambuf.hxx>
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52 //
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53 //####DESCRIPTIONEND####
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54 //
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55 //===========================================================================
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56
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57 // CONFIGURATION
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58
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59 #include <pkgconf/libc_stdio.h> // Configuration header
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60
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61 // Include buffered I/O?
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62 #if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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63
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64
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65 // INCLUDES
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66
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67 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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68 #include <errno.h> // Cyg_ErrNo
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69
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70
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71 // TYPE DEFINITIONS
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72
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73
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74 class Cyg_StdioStreamBuffer
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75 {
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76 private:
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77 // Buffering data
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78
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79 #if defined(CYGSEM_LIBC_STDIO_SETVBUF_MALLOC)
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80 cyg_bool call_free; // should we free the old buffer if set_buffer is
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81 // called?
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82 #else
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83 cyg_uint8 static_buffer[BUFSIZ]; // Static buffer used when we cannot
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84 // use malloc()/free().
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85 #endif
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86
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87 cyg_uint8 *buffer_bottom;
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88
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89 cyg_ucount32 buffer_size;
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90
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91 cyg_uint8 *buffer_top;
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92
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93 cyg_uint8 *current_buffer_position;
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94
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95 public:
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96
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97 // CONSTRUCTORS
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98
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99 // You can change the size, or even supply your own buffer, although
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100 // this only has an effect with dynamic buffers. Otherwise it is
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101 // silently ignored
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102 Cyg_StdioStreamBuffer( cyg_ucount32 size=BUFSIZ,
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103 cyg_uint8 *new_buffer=NULL );
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104
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105
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106 // DESTRUCTORS
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107
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108 ~Cyg_StdioStreamBuffer();
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109
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110 // METHODS
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111
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112 // Set up the buffer. As with the constructor, supplying a new_buffer
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113 // only has an effect with dynamic buffers, although EINVAL is returned
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114 // in that case. ENOMEM may also be returned
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115 Cyg_ErrNo
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116 set_buffer( cyg_ucount32 size=BUFSIZ, cyg_uint8 *new_buffer=NULL );
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117
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118 // Find out how much buffer space is in use
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119 cyg_ucount32
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120 get_buffer_space_used( void );
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121
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122
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123 // What total size is the current buffer set to be. Can be -1 if the
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124 // the buffer is invalid
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125 cyg_count32
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126 get_buffer_size( void );
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127
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128
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129 // get buffer address to read from, and return the number of bytes
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130 // available to read
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131 cyg_ucount32
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132 get_buffer_addr_to_read( cyg_uint8 **buffer );
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133
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134 // when finished reading from said space, tell the buffer how much was
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135 // actually read
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136 void
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137 set_bytes_read( cyg_ucount32 bytes );
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138
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139 // return address of buffer that can be used to write into, and its
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140 // available capacity
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141 cyg_ucount32
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142 get_buffer_addr_to_write( cyg_uint8 **buffer );
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143
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144 // when finished writing into said space, tell the buffer how much was
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145 // actually written
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146 void
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147 set_bytes_written( cyg_ucount32 bytes );
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148
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149 // just empty the whole buffer contents
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150 void
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151 drain_buffer( void );
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152 }; // class Cyg_StdioStreamBuffer
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153
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154 // INLINE FUNCTIONS
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155
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156 #include <cyg/libc/stdio/streambuf.inl>
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157
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158
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159 #endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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160
156
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161 #endif // CYGONCE_LIBC_STDIO_STREAMBUF_HXX multiple inclusion protection
115
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162
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163 // EOF streambuf.hxx