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annotate packages/language/c/libc/stdio/current/include/stream.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_STREAM_HXX
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2 #define CYGONCE_LIBC_STDIO_STREAM_HXX
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3 //========================================================================
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4 //
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5 // stream.hxx
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6 //
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7 // Internal C library stdio stream 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:
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41 // Usage: #include <cyg/libc/stdio/stream.hxx>
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42 //
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43 //####DESCRIPTIONEND####
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44 //
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45 //========================================================================
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46
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47 // CONFIGURATION
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48
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49 #include <pkgconf/libc_stdio.h> // Configuration header
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50
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51 // INCLUDES
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52
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53 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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54 #include <cyg/infra/cyg_ass.h> // Get assertion macros, as appropriate
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55 #include <errno.h> // Cyg_ErrNo
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56 #include <stdio.h> // fpos_t and IOBUF defines
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57 #include <cyg/libc/stdio/io.hxx> // Physical IO support
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58 #include <cyg/libc/stdio/streambuf.hxx> // Stdio stream file buffers
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59
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60 #ifdef CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS
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61 #include <pkgconf/kernel.h>
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62 #include <cyg/kernel/mutex.hxx> // Cyg_Mutex
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63 #endif
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64
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65 // TYPE DEFINITIONS
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66
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67 class Cyg_StdioStream
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68 {
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69 friend int setvbuf( FILE *, char *, int, size_t );
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70
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71 private:
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72
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73 // error status for this file
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74 Cyg_ErrNo error;
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75
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76
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77 cyg_stdio_handle_t my_device;
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78
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79 #ifdef CYGFUN_LIBC_STDIO_ungetc
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80 cyg_uint8 unread_char_buf;
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81 #endif
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82
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83 #ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
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84 Cyg_StdioStreamBuffer io_buf; // read/write buffer
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85 #endif
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86 cyg_uint8 readbuf_char; // a one character emergency "buffer"
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87 // only used when configured to not buffer
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88 // (i.e. !CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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89 // or set at runtime to not buffer (i.e.
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90 // buffering mode is _IONBF)
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91
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92 // some flags indicating the state of the file. Some of it is internal
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93 // state, which should not be public. Use bitfields to save
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94 // space, which means using "unsigned int" rather than cyg_uintX
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95 struct {
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96 unsigned int at_eof : 1; // Have we reached eof?
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97
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98 unsigned int opened_for_read : 1; // opened_for_read and
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99
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100 unsigned int opened_for_write : 1; // opened_for_write can
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101 // be set simultaneously
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102
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103 unsigned int binary : 1; // opened for binary or
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104 // text mode?
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105
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106 #ifdef CYGFUN_LIBC_STDIO_ungetc
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107 unsigned int unread_char_buf_in_use : 1; // unget buf in use?
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108 #endif
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109
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110 #ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
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111 unsigned int buffering : 1; // Is this file buffered?
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112
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113 unsigned int line_buffering : 1; // If so, is it line
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114 // buffered? If it is
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115 // buffered, but NOT line
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116 // buffered, it must be
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117 // fully buffered
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118
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119 unsigned int last_buffer_op_was_read : 1; // did we last read from
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120 // the buffer. If not we
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121 // must have written
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122 #endif
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123 unsigned int readbuf_char_in_use : 1; // is the above
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124 // readbuf_char in use?
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125
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126 } flags;
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127
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128 // current position for reading/writing
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129 fpos_t position;
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130
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131 #ifdef CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS
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132 Cyg_Mutex stream_lock; // used for locking this stream
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133 #endif // ifdef CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS
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134
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135 #ifdef CYGDBG_USE_ASSERTS
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136 // a value to check that this class is hopefully valid
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137 cyg_ucount32 magic_validity_word;
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138 #endif
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139
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140 public:
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141 // different modes when constructing (i.e. opening).
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142 typedef enum {
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143 CYG_STREAM_READ,
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144 CYG_STREAM_WRITE,
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145 CYG_STREAM_READWRITE
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146 } OpenMode;
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147
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148 // CONSTRUCTORS
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149
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150 // This constructs the stream - effectively opens the file. This is
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151 // used for static initialisation, and actually calls construct below
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152 //
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153 // dev is a valid Cyg_Device_Table_t, although it does not have to
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154 // be a member of the device table object itself
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155 //
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156 // open_mode is one of CYG_STREAM_READ, CYG_STREAM_WRITE or
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157 // CYG_STREAM_READWRITE
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158 //
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159 // append is true if the file position should be set at EOF on opening
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160 //
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161 // binary is true if this is a binary stream. Otherwise it is a text
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162 // stream and character conversions (especially newline) may occur
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163 //
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164 // buffer_mode is one of _IONBF, _IOLBF, _IOFBF (from <stdio.h>)
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165 // If buffer_mode is _IONBF, buffer_size should still be set to 0
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166 // and buffer_addr to NULL. If buffering is not configured, none
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167 // of buffer_mode, buffer_size and buffer_addr have any effect
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168 //
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169 // buffer_size is the size of buffer to use
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170 //
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171 // buffer_addr is the address of a user supplied buffer. By default
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172 // (when NULL) a system one is provided.
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173 //
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174 // The "return code" is set by assignment to the error member of this
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175 // stream - use the get_error() method to check
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176
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177 Cyg_StdioStream( cyg_stdio_handle_t dev, OpenMode open_mode,
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178 cyg_bool append, cyg_bool binary, int buffer_mode,
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179 cyg_ucount32 buffer_size=BUFSIZ,
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180 cyg_uint8 *buffer_addr=NULL );
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181
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182 Cyg_StdioStream( OpenMode open_mode,
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183 cyg_ucount32 buffer_size=BUFSIZ,
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184 cyg_uint8 *buffer_addr=NULL );
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185
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186 private:
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187 void initialize( cyg_stdio_handle_t dev, OpenMode open_mode,
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188 cyg_bool append, cyg_bool binary, int buffer_mode,
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189 cyg_ucount32 buffer_size=BUFSIZ,
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190 cyg_uint8 *buffer_addr=NULL );
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191 public:
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192
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193 // DESTRUCTOR
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194
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195 ~Cyg_StdioStream();
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196
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197
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198 // MEMBER FUNCTIONS
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199
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200 // Close the stream. This should be called before the destructor,
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201 // so we can see and report any errors produced.
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202 Cyg_ErrNo close();
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203
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204 // Refill read buffer from the stream - note this blocks until
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205 // something arrives on the stream
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206 Cyg_ErrNo
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207 refill_read_buffer( void );
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208
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209
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210 // Read not more than buffer_length bytes from the read buffer into the
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211 // user buffer.
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212 // The number of bytes put into the user buffer is written
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213 // into *bytes_read
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214 Cyg_ErrNo
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215 read( cyg_uint8 *user_buffer, cyg_ucount32 buffer_length,
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216 cyg_ucount32 *bytes_read );
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217
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218
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219 // Read a single byte from the stream. Returns EAGAIN if no character
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220 // available or EEOF if end of file (as well as setting the EOF state)
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221 Cyg_ErrNo
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222 read_byte( cyg_uint8 *c );
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223
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224 // Read a single byte from the stream, but don't remove it. Returns
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225 // EAGAIN if no character available or EEOF if end of file (as well
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226 // as setting the EOF state)
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227 Cyg_ErrNo
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228 peek_byte( cyg_uint8 *c );
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229
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230
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231 // Return a byte into the stream - basically the same as ungetc()
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232 Cyg_ErrNo
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233 unread_byte( cyg_uint8 c );
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234
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235 // the number of bytes available to read without needing to refill the
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236 // buffer
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237 cyg_ucount32
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238 bytes_available_to_read( void );
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239
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240 Cyg_ErrNo
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241 write( const cyg_uint8 *buffer, cyg_ucount32 buffer_length,
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242 cyg_ucount32 *bytes_written );
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243
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244 Cyg_ErrNo
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245 write_byte( cyg_uint8 c );
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246
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247
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248 Cyg_ErrNo
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249 flush_output( void );
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250
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251 Cyg_ErrNo
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252 flush_output_unlocked( void );
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253
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254 // prevent multiple access in thread safe mode
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255
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256 // lock_me() returns false if it couldn't be locked, which could
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257 // happen if the file descriptor is bad
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258
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259 cyg_bool
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260 lock_me( void );
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261
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262 // trylock_me() returns false if it couldn't be locked, probably
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263 // because it is already locked
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264 cyg_bool
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265 trylock_me( void );
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266
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267 void
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268 unlock_me( void );
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269
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270 // get error status for this file
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271 Cyg_ErrNo
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272 get_error( void );
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273
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274 // set error status for this file.
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275 void
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276 set_error( Cyg_ErrNo errno_to_set );
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277
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278 public:
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279 // are we at EOF? true means we are, false means no
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280 cyg_bool
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281 get_eof_state( void );
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282
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283 private:
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284
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285 // Set whether we are at EOF.
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286 void
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287 set_eof_state( cyg_bool eof_to_set );
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288
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289 public:
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290 // retrieve position
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291 Cyg_ErrNo
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292 get_position( fpos_t *pos );
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293
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294 // set absolute position. whence is SEEK_SET, SEEK_CUR, or SEEK_END
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295 Cyg_ErrNo
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296 set_position( fpos_t pos, int whence );
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297
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298 // Return my_device
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299 cyg_stdio_handle_t get_dev() { return my_device; };
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300
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301 CYGDBG_DEFINE_CHECK_THIS
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302 };
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303
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304 // INLINE FUNCTIONS
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305
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306 #include <cyg/libc/stdio/stream.inl>
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307
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308 #endif CYGONCE_LIBC_STDIO_STREAM_HXX multiple inclusion protection
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309
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310 // EOF stream.hxx