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annotate packages/language/c/libc/stdio/current/src/common/fopen.cxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents d2f49caf9e38
children d2c90368aeef
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1 //===========================================================================
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2 //
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3 // fopen.cxx
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4 //
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5 // Implementation of C library file open function as per ANSI 7.9.5.3
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6 //
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7 //===========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //===========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jlarmour
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44 // Contributors:
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45 // Date: 2000-04-20
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46 // Purpose: Implements ISO C fopen() function
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47 // Description:
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48 // Usage:
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //===========================================================================
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53
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54 // CONFIGURATION
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55
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56 #include <pkgconf/libc_stdio.h> // Configuration header
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57
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58
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59 // Do we want fopen()?
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60 #if defined(CYGPKG_LIBC_STDIO_OPEN)
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61
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62 // INCLUDES
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63
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64 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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65 #include <stddef.h> // NULL and size_t from compiler
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66 #include <errno.h> // Error codes
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67 #include <stdio.h> // header for fopen()
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68 #include <stdlib.h> // malloc()
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69 #include <string.h> // strncmp() and strcmp()
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70 #include <cyg/libc/stdio/stdiofiles.hxx> // C library files
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71 #include <cyg/libc/stdio/stream.hxx> // C library streams
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72
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73 #include <cyg/libc/stdio/io.inl> // I/O system inlines
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74
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75 // FUNCTIONS
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76
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77 // placement new
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78 inline void *operator new(size_t size, void *ptr)
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79 {
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80 CYG_CHECK_DATA_PTR( ptr, "Bad pointer" );
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81 return ptr;
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82 }
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83
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84 // process the mode string. Return true on error
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85 static cyg_bool
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86 process_mode( const char *mode, Cyg_StdioStream::OpenMode *rw,
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87 cyg_bool *binary, cyg_bool *append )
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88 {
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89 *binary = *append = false; // default
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90
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91 switch (mode[0]) {
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92 case 'r':
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93 *rw = Cyg_StdioStream::CYG_STREAM_READ;
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94 break;
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95
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96 case 'a':
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97 *append = true;
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98 case 'w':
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99 *rw = Cyg_StdioStream::CYG_STREAM_WRITE;
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100 break;
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101
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102 default:
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103 return true;
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104 } // switch
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105
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106 // ANSI says additional characters may follow the sequences, that we
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107 // don't necessarily recognise so we just ignore them, and pretend that
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108 // its the end of the string
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109
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110 switch (mode[1]) {
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111 case 'b':
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112 *binary = true;
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113 break;
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114 case '+':
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115 *rw = Cyg_StdioStream::CYG_STREAM_READWRITE;
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116 break;
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117 default:
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118 return false;
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119 } // switch
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120
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121 switch (mode[2]) {
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122 case 'b':
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123 *binary = true;
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124 break;
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125 case '+':
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126 *rw = Cyg_StdioStream::CYG_STREAM_READWRITE;
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127 break;
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128 default:
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129 return false;
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130 } // switch
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131
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132 return false;
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133 } // process_mode()
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134
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135
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136 static FILE *fopen_inner( cyg_stdio_handle_t dev,
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137 Cyg_StdioStream::OpenMode open_mode,
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138 cyg_bool binary,
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139 cyg_bool append)
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140 {
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141 Cyg_StdioStream *curr_stream;
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142 int i;
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143 Cyg_ErrNo err;
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144 int bufmode = _IOFBF;
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145 cyg_ucount32 bufsize = BUFSIZ;
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146
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147 Cyg_libc_stdio_files::lock();
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148
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149 // find an empty slot
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150 for (i=0; i < FOPEN_MAX; i++) {
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151 curr_stream = Cyg_libc_stdio_files::get_file_stream(i);
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152 if (curr_stream == NULL)
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153 break;
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154 } // for
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155
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156 if (i == FOPEN_MAX) { // didn't find an empty slot
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157 errno = EMFILE;
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158 cyg_stdio_close( dev );
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159 return NULL;
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160 } // if
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161
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162 // Decide the buffering mode. The default is fully buffered, but if
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163 // this is an interactive stream then set it to non buffered.
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164 if( (dev != CYG_STDIO_HANDLE_NULL) &&
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165 cyg_stdio_interactive( dev ) )
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166 bufmode = _IONBF, bufsize = 0;
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167
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168 // Allocate it some memory and construct it.
208
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169 curr_stream = (Cyg_StdioStream *)malloc(sizeof(*curr_stream));
115
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170 if (curr_stream == NULL) {
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171 cyg_stdio_close( dev );
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172 errno = ENOMEM;
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173 return NULL;
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174 } // if
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175
208
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176 curr_stream = new ((void *)curr_stream) Cyg_StdioStream( dev, open_mode,
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177 append, binary,
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178 bufmode, bufsize );
115
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179 // it puts any error in its own error flag
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180 if (( err=curr_stream->get_error() )) {
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181
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182 Cyg_libc_stdio_files::unlock();
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183
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184 free( curr_stream );
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185
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186 cyg_stdio_close( dev );
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187
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188 errno = err;
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189
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190 return NULL;
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191
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192 } // if
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193
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194 Cyg_libc_stdio_files::set_file_stream(i, curr_stream);
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195
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196 Cyg_libc_stdio_files::unlock();
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197
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198 return (FILE *)(curr_stream);
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199
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200 } // fopen_inner()
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201
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202 externC FILE *
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203 fopen( const char *filename, const char *mode )
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204 {
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205 cyg_stdio_handle_t dev;
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206 Cyg_ErrNo err;
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207 Cyg_StdioStream::OpenMode open_mode;
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208 cyg_bool binary, append;
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209
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210 // process_mode returns true on error
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211 if (process_mode( mode, &open_mode, &binary, &append )) {
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212 errno = EINVAL;
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213 return NULL;
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214 } // if
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215
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216 err = cyg_stdio_open( filename, open_mode, binary, append, &dev );
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217
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218 // if not found
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219 if (err != ENOERR) {
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220 errno = ENOENT;
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221 return NULL;
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222 } // if
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223
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224 return fopen_inner( dev, open_mode, binary, append );
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225
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226 } // fopen()
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227
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228
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229 #endif // defined(CYGPKG_LIBC_STDIO_OPEN)
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230
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231 #ifdef CYGPKG_LIBC_STDIO_FILEIO
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232
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233 externC int fileno( FILE *stream )
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234 {
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235 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
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236
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237 return real_stream->get_dev();
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238 }
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239
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240 externC FILE *fdopen( int fd, const char *mode )
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241 {
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242 Cyg_StdioStream::OpenMode open_mode;
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243 cyg_bool binary, append;
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244 FILE *f;
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245
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246 // process_mode returns true on error
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247 if (process_mode( mode, &open_mode, &binary, &append )) {
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248 errno = EINVAL;
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249 return NULL;
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250 } // if
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251
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252 f = fopen_inner( (cyg_stdio_handle_t)fd, open_mode, binary, append );
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253
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254 if( f == NULL )
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255 return f;
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256
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257 // Do a null seek to initialize the file position.
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258 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)f;
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259 fpos_t pos = 0;
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260 real_stream->set_position( pos, SEEK_CUR );
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261 return f;
115
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262 }
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263
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264 #endif // def CYGPKG_LIBC_STDIO_FILEIO
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265
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266
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267 // EOF fopen.cxx