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annotate packages/language/c/libc/stdio/current/src/common/fopen.cxx @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 //===========================================================================
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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 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //===========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): jlarmour
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43 // Contributors:
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44 // Date: 2000-04-20
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45 // Purpose: Implements ISO C fopen() function
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46 // Description:
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47 // Usage:
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //===========================================================================
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52
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53 // CONFIGURATION
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54
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55 #include <pkgconf/libc_stdio.h> // Configuration header
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56
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57
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58 // INCLUDES
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59
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60 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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61 #include <stddef.h> // NULL and size_t from compiler
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62 #include <errno.h> // Error codes
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63 #include <stdio.h> // header for fopen()
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64 #include <stdlib.h> // malloc()
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65 #include <string.h> // strncmp() and strcmp()
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66 #include <cyg/libc/stdio/stdiofiles.hxx> // C library files
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67 #include <cyg/libc/stdio/stream.hxx> // C library streams
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68
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69 #include <cyg/libc/stdio/io.inl> // I/O system inlines
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70
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71 // FUNCTIONS
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72
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73 // placement new
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74 inline void *operator new(size_t size, void *ptr)
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75 {
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76 CYG_CHECK_DATA_PTR( ptr, "Bad pointer" );
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77 return ptr;
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78 }
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79
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80 // process the mode string. Return true on error
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81 static cyg_bool
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82 process_mode( const char *mode, Cyg_StdioStream::OpenMode *rw,
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83 cyg_bool *binary, cyg_bool *append )
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84 {
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85 *binary = *append = false; // default
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86
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87 switch (mode[0]) {
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88 case 'r':
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89 *rw = Cyg_StdioStream::CYG_STREAM_READ;
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90 break;
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91
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92 case 'a':
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93 *append = true;
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94 /* DROPTHROUGH */
115
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95 case 'w':
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96 *rw = Cyg_StdioStream::CYG_STREAM_WRITE;
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97 break;
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98
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99 default:
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100 return true;
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101 } // switch
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102
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103 // ANSI says additional characters may follow the sequences, that we
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104 // don't necessarily recognise so we just ignore them, and pretend that
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105 // its the end of the string
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106
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107 switch (mode[1]) {
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108 case 'b':
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109 *binary = true;
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110 break;
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111 case '+':
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112 if (mode[0] == 'r')
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113 *rw = Cyg_StdioStream::CYG_STREAM_READWRITE_NOCREATE;
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114 else
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115 *rw = Cyg_StdioStream::CYG_STREAM_READWRITE_CREATE;
115
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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 if (mode[0] == 'r')
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127 *rw = Cyg_StdioStream::CYG_STREAM_READWRITE_NOCREATE;
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128 else
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129 *rw = Cyg_StdioStream::CYG_STREAM_READWRITE_CREATE;
115
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130 break;
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131 default:
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132 return false;
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133 } // switch
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134
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135 return false;
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136 } // process_mode()
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137
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138
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139 static FILE *fopen_inner( cyg_stdio_handle_t dev,
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140 Cyg_StdioStream::OpenMode open_mode,
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141 cyg_bool binary,
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142 cyg_bool append)
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143 {
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144 Cyg_StdioStream *curr_stream;
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145 int i;
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146 Cyg_ErrNo err;
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147 int bufmode = _IOFBF;
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148 cyg_ucount32 bufsize = BUFSIZ;
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149
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150 Cyg_libc_stdio_files::lock();
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151
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152 // find an empty slot
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153 for (i=0; i < FOPEN_MAX; i++) {
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154 curr_stream = Cyg_libc_stdio_files::get_file_stream(i);
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155 if (curr_stream == NULL)
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156 break;
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157 } // for
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158
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159 if (i == FOPEN_MAX) { // didn't find an empty slot
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160 errno = EMFILE;
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161 cyg_stdio_close( dev );
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162 Cyg_libc_stdio_files::unlock();
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163 return NULL;
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164 } // if
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165
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166 // Decide the buffering mode. The default is fully buffered, but if
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167 // this is an interactive stream then set it to non buffered.
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168 if( (dev != CYG_STDIO_HANDLE_NULL) &&
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169 cyg_stdio_interactive( dev ) )
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170 bufmode = _IONBF, bufsize = 0;
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171
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172 // Allocate it some memory and construct it.
208
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173 curr_stream = (Cyg_StdioStream *)malloc(sizeof(*curr_stream));
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174 if (curr_stream == NULL) {
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175 cyg_stdio_close( dev );
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176 Cyg_libc_stdio_files::unlock();
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177 errno = ENOMEM;
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178 return NULL;
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179 } // if
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180
208
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181 curr_stream = new ((void *)curr_stream) Cyg_StdioStream( dev, open_mode,
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182 append, binary,
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183 bufmode, bufsize );
115
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184 // it puts any error in its own error flag
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185 if (( err=curr_stream->get_error() )) {
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186
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187 Cyg_libc_stdio_files::unlock();
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188
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189 free( curr_stream );
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190
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191 cyg_stdio_close( dev );
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192
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193 errno = err;
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194
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195 return NULL;
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196
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197 } // if
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198
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199 Cyg_libc_stdio_files::set_file_stream(i, curr_stream);
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200
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201 Cyg_libc_stdio_files::unlock();
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202
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203 return (FILE *)(curr_stream);
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204
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205 } // fopen_inner()
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206
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207 externC FILE *
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208 fopen( const char *filename, const char *mode ) __THROW
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209 {
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210 cyg_stdio_handle_t dev = 0;
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211 Cyg_ErrNo err;
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212 Cyg_StdioStream::OpenMode open_mode = Cyg_StdioStream::CYG_STREAM_READ;
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213 cyg_bool binary, append;
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214
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215 // process_mode returns true on error
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216 if (process_mode( mode, &open_mode, &binary, &append )) {
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217 errno = EINVAL;
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218 return NULL;
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219 } // if
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220
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221 err = cyg_stdio_open( filename, open_mode, binary, append, &dev );
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222
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223 // if not found
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224 if (err != ENOERR) {
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225 errno = ENOENT;
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226 return NULL;
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227 } // if
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228
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229 return fopen_inner( dev, open_mode, binary, append );
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230
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231 } // fopen()
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232
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233
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234 #ifdef CYGFUN_LIBC_STDIO_OPEN_POSIX_FDFUNCS
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235
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236 externC int fileno( FILE *stream ) __THROW
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237 {
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238 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
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239
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240 return real_stream->get_dev();
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241 }
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242
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243 externC FILE *fdopen( int fd, const char *mode ) __THROW
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244 {
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245 Cyg_StdioStream::OpenMode open_mode;
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246 cyg_bool binary, append;
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247 FILE *f;
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248
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249 // process_mode returns true on error
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250 if (process_mode( mode, &open_mode, &binary, &append )) {
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251 errno = EINVAL;
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252 return NULL;
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253 } // if
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254
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255 f = fopen_inner( (cyg_stdio_handle_t)fd, open_mode, binary, append );
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256
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257 if( f == NULL )
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258 return f;
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259
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260 // Do a null seek to initialize the file position.
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261 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)f;
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262 fpos_t pos = 0;
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263 real_stream->set_position( pos, SEEK_CUR );
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264 return f;
115
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265 }
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266
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267 #endif // def CYGFUN_LIBC_STDIO_OPEN_POSIX_FDFUNCS
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268
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269
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270 // EOF fopen.cxx