Mercurial > flash_v2

annotate packages/language/c/libc/stdio/current/include/stream.inl @ 172:cd45958b28ff

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Merge from eCos master repository on 2001-07-20-10:24:43-BST
author jlarmour
date Fri, 20 Jul 2001 10:23:16 +0000
parents b939e9cada46
children e0c0827131d1
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1 #ifndef CYGONCE_LIBC_STDIO_STREAM_INL
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2 #define CYGONCE_LIBC_STDIO_STREAM_INL
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3 //========================================================================
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4 //
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5 // stream.inl
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6 //
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7 // Inline functions for internal C library stdio stream interface
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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 -
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42 // #include <cyg/libc/stdio/stream.hxx> instead.
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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 // INCLUDES
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53
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54 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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55 #include <stddef.h> // NULL and size_t from compiler
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56 #include <errno.h> // Error codes
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57 #include <cyg/libc/stdio/stream.hxx> // Just be sure that this really is
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58 // included
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59
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60 #include <cyg/libc/stdio/io.inl> // I/O system inlines
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61
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62 // FUNCTIONS
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63
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64 #ifdef CYGDBG_USE_ASSERTS
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65 inline cyg_bool
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66 Cyg_StdioStream::check_this( cyg_assert_class_zeal zeal ) const
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67 {
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68 // check that it has the magic word set meaning it is valid.
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69 if ( magic_validity_word != 0x7b4321ce )
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70 return false;
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71 return true;
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72 } // check_this()
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73
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74 #endif // ifdef CYGDBG_USE_ASSERTS
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75
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76
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77
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78 // LOCKING FUNCTIONS
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79
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80 // returns true on success
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81 inline cyg_bool
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82 Cyg_StdioStream::lock_me( void )
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83 {
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84 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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85
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86 #ifdef CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS
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87 return stream_lock.lock();
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88 #else
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89 // otherwise it "worked"
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90 return true;
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91 #endif
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92
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93 } // lock_me()
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94
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95
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96 // returns true on success
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97 inline cyg_bool
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98 Cyg_StdioStream::trylock_me( void )
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99 {
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100 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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101
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102 #ifdef CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS
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103 return stream_lock.trylock();
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104 #else
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105 // otherwise it "worked"
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106 return true;
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107 #endif
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108
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109 } // lock_me()
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110
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111
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112 inline void
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113 Cyg_StdioStream::unlock_me( void )
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114 {
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115 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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116
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117 #ifdef CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS
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118 stream_lock.unlock();
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119 #endif
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120 } // unlock_me()
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121
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122
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123 // DESTRUCTOR
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124
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125 inline Cyg_ErrNo
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126 Cyg_StdioStream::close()
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127 {
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128 Cyg_ErrNo err = ENOERR;
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129
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130 if (!lock_me())
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131 return EBADF;
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132
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133 if( my_device != CYG_STDIO_HANDLE_NULL )
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134 {
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135 flush_output_unlocked();
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136
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137 err = cyg_stdio_close( my_device );
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138
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139 if( err == ENOERR )
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140 my_device = CYG_STDIO_HANDLE_NULL;
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141 }
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142
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143 unlock_me();
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144
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145 return err;
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146 } // close()
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147
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148 inline
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149 Cyg_StdioStream::~Cyg_StdioStream()
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150 {
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151 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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152
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153 // Close the device if it has not already been closed.
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154 if( my_device != CYG_STDIO_HANDLE_NULL )
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155 close();
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156
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157 #ifdef CYGDBG_USE_ASSERTS
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158 magic_validity_word = 0xbadbad;
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159 #endif
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160 } // Cyg_StdioStream destructor
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161
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162
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163 // MEMBER FUNCTIONS
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164
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165
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166 // this is currently just a wrapper around write, but having this interface
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167 // leaves scope for optimisations in future
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168 inline Cyg_ErrNo
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169 Cyg_StdioStream::write_byte( cyg_uint8 c )
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170 {
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171 cyg_ucount32 dummy_bytes_written;
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172 Cyg_ErrNo err;
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173
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174 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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175
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176 err = write( &c, 1, &dummy_bytes_written );
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177
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178 CYG_ASSERT( (err!=ENOERR) || (dummy_bytes_written==1),
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179 "Single byte not written, but no error returned!" );
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180
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181 return err;
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182 } // write_byte()
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183
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184
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185 inline Cyg_ErrNo
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186 Cyg_StdioStream::unread_byte( cyg_uint8 c )
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187 {
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188 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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189
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190 #ifdef CYGFUN_LIBC_STDIO_ungetc
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191 if (!lock_me())
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192 return EBADF; // assume file is now invalid
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193
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194 if (flags.unread_char_buf_in_use) {
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195 unlock_me();
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196 return ENOMEM;
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197 } // if
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198
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199 flags.unread_char_buf_in_use = true;
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200 unread_char_buf = c;
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201
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202 // can't be at EOF any more
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203 flags.at_eof = false;
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204
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205 if (position) // position is always 0 for certain devices
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206 --position;
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207
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208 unlock_me();
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209
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210 return ENOERR;
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211
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212 #else // ifdef CYGFUN_LIBC_STDIO_ungetc
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213
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214 return ENOSYS;
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215 #endif // ifdef CYGFUN_LIBC_STDIO_ungetc
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216 } // unread_byte()
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217
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218
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219 inline cyg_ucount32
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220 Cyg_StdioStream::bytes_available_to_read( void )
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221 {
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222 cyg_ucount32 bytes=0;
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223
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224 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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225
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226 #ifdef CYGFUN_LIBC_STDIO_ungetc
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227 if (flags.unread_char_buf_in_use)
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228 ++bytes;
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229 #endif
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230
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231 #ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
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232
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233 // either the last operation was a read, which attempted to read bytes
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234 // into the buffer, or there are no bytes in the buffer
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235
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236 if (flags.buffering) {
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237 if (flags.last_buffer_op_was_read == true)
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238 bytes += io_buf.get_buffer_space_used();
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239 }
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240 else
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241
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242 #endif
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243
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244 if (flags.readbuf_char_in_use)
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245 ++bytes;
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246
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247 return bytes;
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248 } // bytes_available_to_read()
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249
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250
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251
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252 inline Cyg_ErrNo
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253 Cyg_StdioStream::flush_output( void )
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254 {
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255 Cyg_ErrNo err;
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256
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257 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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258
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259 if (!lock_me())
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260 return EBADF; // assume file is now invalid
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261
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262 err = flush_output_unlocked();
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263
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264 unlock_me();
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265
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266 return err;
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267 } // flush_output()
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268
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269
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270 // get error status for this file
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271 inline Cyg_ErrNo
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272 Cyg_StdioStream::get_error( void )
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273 {
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274 Cyg_ErrNo err_temp;
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275
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276 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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277
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278 if (!lock_me())
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279 return EBADF; // well, we've certainly got an error now!
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280
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281 err_temp = error;
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282
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283 unlock_me();
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284
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285 return err_temp;
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286 } // get_error()
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287
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288
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289 // set error status for this file
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290 inline void
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291 Cyg_StdioStream::set_error( Cyg_ErrNo errno_to_set )
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292 {
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293 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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294
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295 if (!lock_me())
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296 {
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297 errno = EBADF; // best we can do - we can't trust error to be there
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298 return;
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299 } // if
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300
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301 errno = error = errno_to_set;
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302
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303 if ( EEOF == error )
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304 flags.at_eof = 1;
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305
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306 unlock_me();
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307 } // set_error()
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308
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309
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310 // are we at EOF? true means we are, false means no
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311 inline cyg_bool
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312 Cyg_StdioStream::get_eof_state( void )
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313 {
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314 cyg_bool eof_temp;
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315
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316 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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317
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318 if (!lock_me())
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319 return false; // not much we can do here
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320
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321 eof_temp = flags.at_eof;
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322
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323 unlock_me();
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324
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325 return eof_temp;
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326 } // get_eof_state()
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327
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328
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329 // Set whether we are at EOF.
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330 inline void
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331 Cyg_StdioStream::set_eof_state( cyg_bool eof_to_set )
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332 {
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333 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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334
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335 if (!lock_me())
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336 return; // not much we can do here
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337
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338 flags.at_eof = eof_to_set;
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339
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340 unlock_me();
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341 } // set_eof_state()
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342
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343
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344 // retrieve position
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345 inline Cyg_ErrNo
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346 Cyg_StdioStream::get_position( fpos_t *pos )
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347 {
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348 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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349
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350 if (!lock_me())
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351 return EBADF; // assume file is now invalid
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352
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353 *pos = position;
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354
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355 unlock_me();
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356
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357 return ENOERR;
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358
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359 } // get_position()
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360
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361
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362 // set absolute position
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363 inline Cyg_ErrNo
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364 Cyg_StdioStream::set_position( fpos_t pos, int whence )
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365 {
172
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366 CYG_ASSERTCLASS( this, "Stream object is not a valid stream!" );
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367
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368 #ifndef CYGPKG_LIBC_STDIO_FILEIO
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369 // this is currently a workaround until we have real files
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370 // this will be corrected when we decide the true filesystem interface
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371
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372 Cyg_ErrNo err;
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373 cyg_uint8 c;
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374
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375 if ((whence != SEEK_CUR) || pos < 0)
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376 return ENOSYS;
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377
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378 if (!lock_me())
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379 return EBADF; // assume file is now invalid
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380
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381 // Drain read buffer
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382
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383 for ( ; whence > 0 ; whence-- ) {
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384 err = read_byte( &c );
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385 if (err == EAGAIN)
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386 err=refill_read_buffer();
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387
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388 // if read_byte retured error, or refill_read_buffer returned error
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389 if (err) {
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390 unlock_me();
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391 return err;
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392 } // if
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393 } // for
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394
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395 unlock_me();
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396
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397 return ENOERR;
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398
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399 #else
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400
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401 if (!lock_me())
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402 return EBADF; // assume file is now invalid
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403
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404 if ( whence != SEEK_END ) {
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405 cyg_ucount32 bytesavail = bytes_available_to_read();
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406 off_t abspos = (whence == SEEK_CUR) ? position + pos : pos;
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407 off_t posdiff = abspos - position;
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408
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409 if ( bytesavail > posdiff ) {
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410 // can just "seek" within the existing buffer
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411 #ifdef CYGFUN_LIBC_STDIO_ungetc
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412 if (flags.unread_char_buf_in_use) {
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413 flags.unread_char_buf_in_use = false;
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414 posdiff--;
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415 }
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416 #endif
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417 #ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
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418 if (posdiff>0 && flags.buffering) {
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419 io_buf.set_bytes_read(posdiff);
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420 posdiff=0;
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421 } else
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422 #endif
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423 if (posdiff>0 && flags.readbuf_char_in_use) {
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424 flags.readbuf_char_in_use = false;
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425 posdiff--;
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426 }
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427 CYG_ASSERT(posdiff==0, "Failed to seek within buffer correctly");
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428
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429 position = abspos;
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430 unlock_me();
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431 return ENOERR;
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432 } // endif (bytesavail > posdiff)
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433
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434 if (whence == SEEK_CUR) {
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435 position += bytesavail;
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436 }
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437 } //endif (whence != SEEK_END)
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438
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439 Cyg_ErrNo err;
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440 off_t newpos=pos;
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441
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442 err = cyg_stdio_lseek( my_device, &newpos, whence );
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443
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444 if( err == ENOERR )
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445 {
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446 // Clean out the buffer. Flush output if any present,
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447 // and clear any input out of input buffer and any ungot
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448 // chars from unread buffer.
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449
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450 err = flush_output_unlocked();
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451 io_buf.drain_buffer();
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452 #ifdef CYGFUN_LIBC_STDIO_ungetc
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453 flags.unread_char_buf_in_use = false;
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454 #endif
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455
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456 // Clear EOF indicator.
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457 flags.at_eof = false;
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458
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459 // update stream pos
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460 position = newpos;
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461 }
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462
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463 unlock_me();
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464
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465 return err;
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466 #endif
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467
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468 } // set_position()
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469
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470
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471 #endif // CYGONCE_LIBC_STDIO_STREAM_INL multiple inclusion protection
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472
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473 // EOF stream.inl