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| 2404 | konopa | 1 | /* |
| 2 | * Copyright (c) 1987,1997, Prentice Hall |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use of the MINIX operating system in source and |
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| 6 | * binary forms, with or without modification, are permitted provided |
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| 7 | * that the following conditions are met: |
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| 8 | |||
| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | |||
| 12 | * - Redistributions in binary form must reproduce the above |
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| 13 | * copyright notice, this list of conditions and the following |
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| 14 | * disclaimer in the documentation and/or other materials provided |
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| 15 | * with the distribution. |
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| 16 | |||
| 17 | * - Neither the name of Prentice Hall nor the names of the software |
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| 18 | * authors or contributors may be used to endorse or promote |
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| 19 | * products derived from this software without specific prior |
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| 20 | * written permission. |
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| 21 | |||
| 22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND |
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| 23 | * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 24 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 26 | * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE |
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| 27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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| 30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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| 31 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
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| 32 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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| 33 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 34 | */ |
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| 2435 | jelen | 35 | |
| 36 | /** @addtogroup FileSystemImpl |
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| 37 | * @{ |
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| 38 | */ |
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| 2404 | konopa | 39 | |
| 2435 | jelen | 40 | /** |
| 41 | * @file utility.c |
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| 42 | * @brief This is the master header for fs. It includes some other files |
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| 43 | * and defines the principal constants. |
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| 44 | */ |
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| 2404 | konopa | 45 | |
| 2435 | jelen | 46 | |
| 2386 | konopa | 47 | /* This file contains a few general purpose utility routines. */ |
| 48 | |||
| 49 | #include <unistd.h> |
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| 50 | #include "fs.h" |
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| 51 | #include "block.h" |
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| 52 | #include "file.h" |
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| 53 | #include "fproc.h" |
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| 54 | #include "inode.h" |
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| 55 | |||
| 2435 | jelen | 56 | /** |
| 57 | * Go get a path name from user space |
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| 58 | */ |
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| 2386 | konopa | 59 | int fetch_name(char* path, int len) |
| 60 | { |
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| 61 | |||
| 62 | /* Go get path and put it in 'user_path' */ |
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| 63 | |||
| 64 | register char *rpu, *rpm; |
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| 65 | |||
| 66 | /* Check name length for validity */ |
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| 67 | if (len <= 0) { |
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| 68 | err_code = FS_EINVAL; |
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| 69 | return FS_EGENERIC; |
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| 70 | } |
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| 71 | |||
| 72 | if (len > PATH_MAX) { |
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| 73 | err_code = FS_ENAMETOOLONG; |
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| 74 | return FS_EGENERIC; |
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| 75 | } |
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| 76 | |||
| 77 | rpu = &user_path[0]; |
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| 78 | rpm = path; |
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| 79 | do { *rpu++ = *rpm++; |
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| 80 | } while (--len); |
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| 81 | |||
| 82 | return OK; |
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| 83 | } |
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| 2435 | jelen | 84 | |
| 85 | /** |
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| 86 | * Reject a system call that FS does not handle |
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| 87 | */ |
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| 2386 | konopa | 88 | int no_sys() |
| 89 | { |
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| 90 | |||
| 91 | /* Somebody has used an illegal system call number */ |
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| 92 | |||
| 93 | print_console("FS_NOSYS called, illegal system call number!\n"); |
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| 94 | |||
| 2435 | jelen | 95 | re\turn FS_EINVAL; |
| 2386 | konopa | 96 | } |
| 2435 | jelen | 97 | |
| 98 | /** |
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| 99 | * Does byte swapping on a 16-bit int |
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| 100 | */ |
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| 2386 | konopa | 101 | unsigned conv2(int norm, int w) |
| 102 | { |
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| 103 | |||
| 104 | /* Possibly swap a 16-bit word between 8086 and 68000 byte order. */ |
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| 105 | |||
| 106 | if (norm) /* TRUE if no swap, FALSE for byte swap */ |
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| 107 | return((unsigned) w & 0xFFFF); |
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| 108 | |||
| 109 | return(((w&BYTE) << 8) | ( (w>>8) & BYTE)); |
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| 110 | } |
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| 111 | |||
| 2435 | jelen | 112 | /** |
| 113 | * Does byte swapping on a 32-bit long |
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| 114 | */ |
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| 2386 | konopa | 115 | long conv4(int norm, long x) |
| 116 | { |
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| 117 | |||
| 118 | /* Possibly swap a 32-bit long between 8086 and 68000 byte order. */ |
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| 119 | |||
| 120 | unsigned lo, hi; |
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| 121 | long l; |
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| 122 | |||
| 123 | if (norm) /* byte order was already ok */ |
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| 124 | return(x); |
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| 125 | |||
| 126 | lo = conv2(FALSE, (int) x & 0xFFFF); /* low-order half, byte swapped */ |
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| 127 | hi = conv2(FALSE, (int) (x>>16) & 0xFFFF); /* high-order half, swapped */ |
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| 128 | l = ((long) lo <<16) | hi; |
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| 129 | |||
| 130 | return l; |
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| 131 | } |
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| 132 | |||
| 2435 | jelen | 133 | /** |
| 134 | * Same like strncmp |
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| 135 | */ |
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| 2386 | konopa | 136 | int fs_strncmp(const char *src, const char *dst, size_t len) |
| 137 | { |
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| 138 | |||
| 139 | int i, src_len, dst_len; |
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| 140 | |||
| 141 | if (src == NULL) { |
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| 142 | if (dst == NULL) |
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| 143 | return 0; |
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| 144 | return -1; |
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| 145 | } |
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| 146 | |||
| 147 | if (dst == NULL) |
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| 148 | return 1; |
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| 149 | |||
| 150 | src_len = strlen(src); |
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| 151 | dst_len = strlen(dst); |
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| 152 | |||
| 153 | for (i = 0; i < len && i < src_len && i < dst_len; i++) { |
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| 154 | if (src[i] > dst[i]) |
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| 155 | return 1; |
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| 156 | if (src[i] < dst[i]) |
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| 157 | return -1; |
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| 158 | } |
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| 159 | |||
| 160 | return 0; |
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| 161 | } |
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| 2435 | jelen | 162 | |
| 163 | /** |
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| 164 | * } |
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| 165 | */ |
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| 166 |