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annotate packages/language/c/libc/stdio/current/include/streambuf.inl @ 132:0ae0bc38e387 ecos-sw-2000-10-31

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Merge from eCos master repository on 2000-10-31-00:30:36-GMT
author jlarmour
date Tue, 31 Oct 2000 20:53:09 +0000
parents 6ed91473a1cd
children b939e9cada46
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1 #ifndef CYGONCE_LIBC_STDIO_STREAMBUF_INL
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2 #define CYGONCE_LIBC_STDIO_STREAMBUF_INL
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3 //===========================================================================
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4 //
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5 // streambuf.inl
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6 //
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7 // Internal C library stdio stream buffer inline functions
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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:
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41 // Usage: Do not include this file directly, instead
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42 // #include <cyg/libc/stdio/streambuf.hxx>
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43 //
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44 //####DESCRIPTIONEND####
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45 //
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46 //===========================================================================
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47
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48 // CONFIGURATION
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49
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50 #include <pkgconf/libc_stdio.h> // Configuration header
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51
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52 // Include buffered I/O?
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53 #if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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54
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55
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56 // INCLUDES
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57
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58 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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59 #include <cyg/infra/cyg_ass.h> // Assertion support
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60 #include <errno.h> // Cyg_ErrNo
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61 #include <stdio.h> // fpos_t and iobuf defines
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62 #include <stdlib.h> // free()
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63 #include <cyg/libc/stdio/streambuf.hxx> // header for this file, just in case
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64 #include <limits.h> // INT_MAX
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65
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66 // FUNCTIONS
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67
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68 inline
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69 Cyg_StdioStreamBuffer::Cyg_StdioStreamBuffer( cyg_ucount32 size=BUFSIZ,
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70 cyg_uint8 *new_buffer=NULL ) :
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71 #if defined(CYGSEM_LIBC_STDIO_SETVBUF_MALLOC)
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72 call_free(false),
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73 buffer_bottom( NULL ),
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74 buffer_size(0),
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75 #else
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76 buffer_bottom( static_buffer ),
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77 buffer_size(sizeof(static_buffer)),
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78 #endif
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79 buffer_top(NULL),
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80 current_buffer_position(NULL)
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81 {
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82 // NB Many of the above members in the initialisation list may seem
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83 // unnecessary, but it is to ensure a defined state if e.g. the malloc
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84 // in set_buffer() should fail
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85
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86 (void)set_buffer(size, new_buffer);
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87 } // Cyg_StdioStreamBuffer constructor
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88
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89
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90 inline
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91 Cyg_StdioStreamBuffer::~Cyg_StdioStreamBuffer()
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92 {
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93 #ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
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94 if ((buffer_bottom != NULL) && call_free)
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95 free( buffer_bottom );
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96 #endif
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97 } // Cyg_StdioStreamBuffer destructor
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98
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99
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100 inline cyg_ucount32
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101 Cyg_StdioStreamBuffer::get_buffer_space_used( void )
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102 {
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103 return (buffer_top - current_buffer_position);
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104 } // get_buffer_space_used()
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105
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106
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107 inline cyg_count32
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108 Cyg_StdioStreamBuffer::get_buffer_size( void )
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109 {
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110 #ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
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111 if (buffer_bottom==NULL)
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112 return -1;
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113 #endif
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114 return buffer_size;
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115 } // get_buffer_size()
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116
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117
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118 inline cyg_ucount32
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119 Cyg_StdioStreamBuffer::get_buffer_addr_to_read( cyg_uint8 **buffer )
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120 {
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121 *buffer = current_buffer_position;
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122
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123 return (buffer_top - current_buffer_position);
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124 } // get_buffer_addr_to_read()
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125
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126 inline void
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127 Cyg_StdioStreamBuffer::set_bytes_read( cyg_ucount32 bytes )
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128 {
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129 cyg_uint8 *buffer_max = &buffer_bottom[ get_buffer_size() ];
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130
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131 current_buffer_position += bytes;
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132
132
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133 // INT_MAX is used by some callers to mean infinite.
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134 CYG_ASSERT( (current_buffer_position <= buffer_top)
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135 || (get_buffer_size() == INT_MAX),
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136 "read too many bytes from buffer" );
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137
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138 if (current_buffer_position == buffer_max)
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139 current_buffer_position = buffer_top = &buffer_bottom[0];
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140
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141 } // set_bytes_read()
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142
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143
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144 inline cyg_ucount32
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145 Cyg_StdioStreamBuffer::get_buffer_addr_to_write( cyg_uint8 **buffer )
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146 {
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147 cyg_uint8 *buffer_max = &buffer_bottom[ get_buffer_size() ];
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148
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149 *buffer = buffer_top;
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150
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151 return (buffer_max - buffer_top);
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152 } // get_buffer_addr_to_write()
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153
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154
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155 inline void
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156 Cyg_StdioStreamBuffer::set_bytes_written( cyg_ucount32 bytes )
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157 {
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158 buffer_top += bytes;
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159
132
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160 // INT_MAX is used by some callers to mean infinite.
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161 CYG_ASSERT( (buffer_top <= &buffer_bottom[ get_buffer_size() ])
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162 || (get_buffer_size() == INT_MAX),
115
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163 "wrote too many bytes into buffer" );
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164 } // set_bytes_written()
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165
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166
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167 inline void
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168 Cyg_StdioStreamBuffer::drain_buffer( void )
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169 {
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170 buffer_top = current_buffer_position = &buffer_bottom[0];
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171 } // drain_buffer()
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172
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173 #endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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174
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175 #endif CYGONCE_LIBC_STDIO_STREAMBUF_INL multiple inclusion protection
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176
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177 // EOF streambuf.inl