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annotate packages/language/c/libc/stdio/current/src/common/fopen.cxx @ 134:d2f49caf9e38 ecos-sw-2000-11-03

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Merge from eCos master repository on 2000-11-03-09:00:49-GMT
author jlarmour
date Fri, 03 Nov 2000 21:17:40 +0000
parents 6ed91473a1cd
children e0c0827131d1
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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 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //===========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors:
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36 // Date: 2000-04-20
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37 // Purpose: Implements ISO C fopen() function
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38 // Description:
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39 // Usage:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //===========================================================================
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44
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45 // CONFIGURATION
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46
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47 #include <pkgconf/libc_stdio.h> // Configuration header
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48
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49
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50 // Do we want fopen()?
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51 #if defined(CYGPKG_LIBC_STDIO_OPEN)
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52
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53 // INCLUDES
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54
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55 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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56 #include <stddef.h> // NULL and size_t from compiler
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57 #include <errno.h> // Error codes
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58 #include <stdio.h> // header for fopen()
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59 #include <stdlib.h> // malloc()
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60 #include <string.h> // strncmp() and strcmp()
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61 #include <cyg/libc/stdio/stdiofiles.hxx> // C library files
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62 #include <cyg/libc/stdio/stream.hxx> // C library streams
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63
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64 #include <cyg/libc/stdio/io.inl> // I/O system inlines
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65
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66 // FUNCTIONS
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67
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68 // process the mode string. Return true on error
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69 static cyg_bool
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70 process_mode( const char *mode, Cyg_StdioStream::OpenMode *rw,
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71 cyg_bool *binary, cyg_bool *append )
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72 {
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73 *binary = *append = false; // default
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74
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75 switch (mode[0]) {
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76 case 'r':
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77 *rw = Cyg_StdioStream::CYG_STREAM_READ;
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78 break;
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79
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80 case 'a':
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81 *append = true;
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82 case 'w':
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83 *rw = Cyg_StdioStream::CYG_STREAM_WRITE;
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84 break;
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85
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86 default:
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87 return true;
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88 } // switch
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89
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90 // ANSI says additional characters may follow the sequences, that we
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91 // don't necessarily recognise so we just ignore them, and pretend that
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92 // its the end of the string
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93
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94 switch (mode[1]) {
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95 case 'b':
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96 *binary = true;
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97 break;
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98 case '+':
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99 *rw = Cyg_StdioStream::CYG_STREAM_READWRITE;
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100 break;
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101 default:
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102 return false;
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103 } // switch
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104
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105 switch (mode[2]) {
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106 case 'b':
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107 *binary = true;
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108 break;
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109 case '+':
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110 *rw = Cyg_StdioStream::CYG_STREAM_READWRITE;
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111 break;
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112 default:
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113 return false;
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114 } // switch
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115
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116 return false;
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117 } // process_mode()
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118
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119
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120 static FILE *fopen_inner( cyg_stdio_handle_t dev,
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121 Cyg_StdioStream::OpenMode open_mode,
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122 cyg_bool binary,
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123 cyg_bool append)
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124 {
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125 Cyg_StdioStream *curr_stream;
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126 int i;
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127 Cyg_ErrNo err;
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128 int bufmode = _IOFBF;
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129 cyg_ucount32 bufsize = BUFSIZ;
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130
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131 Cyg_libc_stdio_files::lock();
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132
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133 // find an empty slot
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134 for (i=0; i < FOPEN_MAX; i++) {
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135 curr_stream = Cyg_libc_stdio_files::get_file_stream(i);
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136 if (curr_stream == NULL)
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137 break;
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138 } // for
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139
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140 if (i == FOPEN_MAX) { // didn't find an empty slot
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141 errno = EMFILE;
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142 cyg_stdio_close( dev );
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143 return NULL;
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144 } // if
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145
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146 // Decide the buffering mode. The default is fully buffered, but if
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147 // this is an interactive stream then set it to non buffered.
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148 if( (dev != CYG_STDIO_HANDLE_NULL) &&
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149 cyg_stdio_interactive( dev ) )
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150 bufmode = _IONBF, bufsize = 0;
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151
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152 // Allocate it some memory and construct it.
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153 curr_stream = new Cyg_StdioStream( dev, open_mode, append, binary,
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154 bufmode, bufsize );
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155
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156 if (curr_stream == NULL) {
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157 cyg_stdio_close( dev );
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158 errno = ENOMEM;
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159 return NULL;
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160 } // if
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161
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162
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163 // it puts any error in its own error flag
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164 if (( err=curr_stream->get_error() )) {
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165
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166 Cyg_libc_stdio_files::unlock();
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167
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168 free( curr_stream );
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169
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170 cyg_stdio_close( dev );
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171
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172 errno = err;
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173
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174 return NULL;
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175
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176 } // if
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177
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178 Cyg_libc_stdio_files::set_file_stream(i, curr_stream);
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179
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180 Cyg_libc_stdio_files::unlock();
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181
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182 return (FILE *)(curr_stream);
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183
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184 } // fopen_inner()
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185
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186 externC FILE *
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187 fopen( const char *filename, const char *mode )
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188 {
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189 cyg_stdio_handle_t dev;
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190 Cyg_ErrNo err;
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191 Cyg_StdioStream::OpenMode open_mode;
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192 cyg_bool binary, append;
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193
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194 // process_mode returns true on error
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195 if (process_mode( mode, &open_mode, &binary, &append )) {
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196 errno = EINVAL;
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197 return NULL;
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198 } // if
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199
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200 err = cyg_stdio_open( filename, open_mode, binary, append, &dev );
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201
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202 // if not found
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203 if (err != ENOERR) {
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204 errno = ENOENT;
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205 return NULL;
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206 } // if
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207
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208 return fopen_inner( dev, open_mode, binary, append );
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209
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210 } // fopen()
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211
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212
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213 #endif // defined(CYGPKG_LIBC_STDIO_OPEN)
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214
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215 #ifdef CYGPKG_LIBC_STDIO_FILEIO
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216
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217 externC int fileno( FILE *stream )
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218 {
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219 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
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220
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221 return real_stream->get_dev();
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222 }
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223
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224 externC FILE *fdopen( int fd, const char *mode )
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225 {
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226 Cyg_StdioStream::OpenMode open_mode;
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227 cyg_bool binary, append;
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228 FILE *f;
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229
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230 // process_mode returns true on error
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231 if (process_mode( mode, &open_mode, &binary, &append )) {
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232 errno = EINVAL;
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233 return NULL;
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234 } // if
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235
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236 f = fopen_inner( (cyg_stdio_handle_t)fd, open_mode, binary, append );
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237
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238 if( f == NULL )
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239 return f;
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240
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241 // Do a null seek to initialize the file position.
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242 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)f;
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243 fpos_t pos = 0;
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244 real_stream->set_position( pos, SEEK_CUR );
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245 return f;
115
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246 }
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247
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248 #endif // def CYGPKG_LIBC_STDIO_FILEIO
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249
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250
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251 // EOF fopen.cxx