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| Rev | Author | Line No. | Line |
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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 |