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1085 | pj | 1 | /* |
2 | * Project: S.Ha.R.K. |
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3 | * |
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4 | * Coordinators: |
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5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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6 | * Paolo Gai <pj@gandalf.sssup.it> |
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7 | * |
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8 | * Authors : |
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9 | * Paolo Gai <pj@gandalf.sssup.it> |
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10 | * (see the web pages for full authors list) |
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11 | * |
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12 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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13 | * |
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14 | * http://www.sssup.it |
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15 | * http://retis.sssup.it |
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16 | * http://shark.sssup.it |
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17 | */ |
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18 | |||
19 | /** |
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20 | ------------ |
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21 | CVS : $Id: dosfs.c,v 1.1.1.1 2002-09-02 09:37:41 pj Exp $ |
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22 | |||
23 | File: $File$ |
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24 | Revision: $Revision: 1.1.1.1 $ |
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25 | Last update: $Date: 2002-09-02 09:37:41 $ |
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26 | ------------ |
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27 | **/ |
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28 | |||
29 | /* |
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30 | * Copyright (C) 2000 Paolo Gai and Gabriele Bolognini |
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31 | * |
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32 | * This program is free software; you can redistribute it and/or modify |
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33 | * it under the terms of the GNU General Public License as published by |
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34 | * the Free Software Foundation; either version 2 of the License, or |
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35 | * (at your option) any later version. |
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36 | * |
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37 | * This program is distributed in the hope that it will be useful, |
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38 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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39 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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40 | * GNU General Public License for more details. |
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41 | * |
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42 | * You should have received a copy of the GNU General Public License |
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43 | * along with this program; if not, write to the Free Software |
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44 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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45 | * |
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46 | */ |
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47 | |||
48 | #include "kernel/kern.h" |
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49 | #include "string.h" |
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50 | #include "ll/i386/x-dos.h" |
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51 | |||
52 | |||
53 | /* This is the buffer used by read_myfile */ |
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54 | char myfilebuf[1000]; |
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55 | |||
56 | /* This is the number of bytes read by read_myfile */ |
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57 | int myfilebuf_length; |
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58 | |||
59 | /* This function write myfile.out (up to 30 chars) */ |
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60 | void write_myfile(void *arg); |
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61 | |||
62 | int main(int argc, char **argv) |
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63 | { |
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64 | int x; |
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65 | |||
66 | cprintf("\nBuffer contents:\n"); |
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67 | |||
68 | for (x=0; x<myfilebuf_length; x++) |
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69 | cputc(myfilebuf[x]); |
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70 | |||
71 | /* |
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72 | WARNING: You can call these functions only when you are in |
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73 | real mode!!! |
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74 | |||
75 | The system is in real mode: |
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76 | - into __kernel_register_levels__() |
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77 | - into sys_atrunlevel functions posted with RUNLEVEL_AFTER_EXIT |
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78 | */ |
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79 | |||
80 | if (myfilebuf_length) |
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81 | sys_atrunlevel(write_myfile, NULL, RUNLEVEL_AFTER_EXIT); |
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82 | |||
83 | return 0; |
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84 | /* |
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85 | * Since there is only one user task, the kernel will shut down after this |
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86 | * task finishes... |
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87 | */ |
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88 | } |
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89 | |||
90 | /* This function read myfile.txt (up to 1000 chars) */ |
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91 | void read_myfile(void) |
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92 | { |
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93 | /* DOS file descriptor */ |
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94 | DOS_FILE *f; |
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95 | |||
96 | /* Error code */ |
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97 | int err; |
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98 | |||
99 | /* open the DOS file for reading (you can specify only "r" or "w") */ |
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100 | f = DOS_fopen("myfile.txt","r"); |
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101 | |||
102 | /* check for open errors */ |
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103 | if (!f) { |
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104 | /* error!! */ |
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105 | err = DOS_error(); |
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106 | |||
107 | /* note that if you call DOS_error() here, it return 0!!! */ |
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108 | cprintf("Error %d opening myfile.txt...\n", err); |
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109 | myfilebuf_length = 0; |
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110 | return; |
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111 | } |
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112 | |||
113 | /* read up to 1000 chars */ |
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114 | myfilebuf_length = DOS_fread(&myfilebuf,1,1000,f); |
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115 | |||
116 | /* check for errors */ |
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117 | err = DOS_error(); |
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118 | |||
119 | cprintf("Read %d bytes from myfile.txt...\n", myfilebuf_length); |
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120 | |||
121 | if (err) { |
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122 | cprintf("Error %d reading myfile.txt...\n", err); |
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123 | myfilebuf_length = 0; |
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124 | /* there is not return because I want to close the file! */ |
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125 | } |
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126 | |||
127 | /* Close the file */ |
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128 | DOS_fclose(f); |
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129 | } |
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130 | |||
131 | /* This function write myfile.out (up to 30 chars) */ |
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132 | void write_myfile(void *arg) |
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133 | { |
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134 | DOS_FILE *f; /* DOS file descriptor */ |
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135 | int err; /* Error code */ |
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136 | int maxbytes; |
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137 | int writtenbytes; /* number of files written */ |
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138 | |||
139 | /* open the DOS file for writing (you can specify only "r" or "w") */ |
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140 | f = DOS_fopen("myfile.out","w"); |
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141 | |||
142 | /* check for open errors */ |
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143 | if (!f) { |
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144 | /* error!! */ |
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145 | err = DOS_error(); |
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146 | |||
147 | /* note that if you call DOS_error() here, it return 0!!! */ |
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148 | cprintf("Error %d opening myfile.out...\n", err); |
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149 | return; |
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150 | } |
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151 | |||
152 | /* write up to 30 bytes */ |
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153 | if (myfilebuf_length > 30) |
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154 | maxbytes = 30; |
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155 | else |
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156 | maxbytes = myfilebuf_length; |
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157 | |||
158 | writtenbytes = DOS_fwrite(myfilebuf,1,maxbytes,f); |
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159 | |||
160 | /* check for errors */ |
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161 | err = DOS_error(); |
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162 | |||
163 | cprintf("Written %d bytes into myfile.out...\n", writtenbytes); |
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164 | |||
165 | if (err) { |
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166 | cprintf("Error %d writing myfile.txt...\n", err); |
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167 | /* there is not return because I want to close the file! */ |
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168 | } |
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169 | |||
170 | /* Close the file */ |
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171 | DOS_fclose(f); |
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172 | } |
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173 | |||
174 |