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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2386 | konopa | 1 | /* This file contains a few general purpose utility routines. */ |
| 2 | |||
| 3 | /* Methods: |
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| 4 | * fetch_name: go get a path name from user space |
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| 5 | * no_sys: reject a system call that FS does not handle |
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| 6 | * conv2: does byte swapping on a 16-bit int |
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| 7 | * conv4: does byte swapping on a 32-bit long |
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| 8 | * fs_strncmp: same like strncmp |
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| 9 | */ |
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| 10 | |||
| 11 | |||
| 12 | #include <unistd.h> |
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| 13 | #include "fs.h" |
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| 14 | #include "block.h" |
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| 15 | #include "file.h" |
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| 16 | #include "fproc.h" |
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| 17 | #include "inode.h" |
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| 18 | |||
| 19 | |||
| 20 | int fetch_name(char* path, int len) |
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| 21 | { |
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| 22 | |||
| 23 | /* Go get path and put it in 'user_path' */ |
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| 24 | |||
| 25 | register char *rpu, *rpm; |
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| 26 | |||
| 27 | /* Check name length for validity */ |
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| 28 | if (len <= 0) { |
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| 29 | err_code = FS_EINVAL; |
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| 30 | return FS_EGENERIC; |
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| 31 | } |
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| 32 | |||
| 33 | if (len > PATH_MAX) { |
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| 34 | err_code = FS_ENAMETOOLONG; |
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| 35 | return FS_EGENERIC; |
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| 36 | } |
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| 37 | |||
| 38 | rpu = &user_path[0]; |
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| 39 | rpm = path; |
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| 40 | do { *rpu++ = *rpm++; |
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| 41 | } while (--len); |
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| 42 | |||
| 43 | return OK; |
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| 44 | } |
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| 45 | |||
| 46 | int no_sys() |
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| 47 | { |
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| 48 | |||
| 49 | /* Somebody has used an illegal system call number */ |
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| 50 | |||
| 51 | print_console("FS_NOSYS called, illegal system call number!\n"); |
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| 52 | |||
| 53 | return FS_EINVAL; |
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| 54 | } |
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| 55 | |||
| 56 | unsigned conv2(int norm, int w) |
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| 57 | { |
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| 58 | |||
| 59 | /* Possibly swap a 16-bit word between 8086 and 68000 byte order. */ |
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| 60 | |||
| 61 | if (norm) /* TRUE if no swap, FALSE for byte swap */ |
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| 62 | return((unsigned) w & 0xFFFF); |
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| 63 | |||
| 64 | return(((w&BYTE) << 8) | ( (w>>8) & BYTE)); |
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| 65 | } |
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| 66 | |||
| 67 | long conv4(int norm, long x) |
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| 68 | { |
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| 69 | |||
| 70 | /* Possibly swap a 32-bit long between 8086 and 68000 byte order. */ |
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| 71 | |||
| 72 | unsigned lo, hi; |
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| 73 | long l; |
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| 74 | |||
| 75 | if (norm) /* byte order was already ok */ |
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| 76 | return(x); |
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| 77 | |||
| 78 | lo = conv2(FALSE, (int) x & 0xFFFF); /* low-order half, byte swapped */ |
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| 79 | hi = conv2(FALSE, (int) (x>>16) & 0xFFFF); /* high-order half, swapped */ |
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| 80 | l = ((long) lo <<16) | hi; |
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| 81 | |||
| 82 | return l; |
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| 83 | } |
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| 84 | |||
| 85 | int fs_strncmp(const char *src, const char *dst, size_t len) |
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| 86 | { |
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| 87 | |||
| 88 | int i, src_len, dst_len; |
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| 89 | |||
| 90 | if (src == NULL) { |
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| 91 | if (dst == NULL) |
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| 92 | return 0; |
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| 93 | return -1; |
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| 94 | } |
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| 95 | |||
| 96 | if (dst == NULL) |
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| 97 | return 1; |
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| 98 | |||
| 99 | src_len = strlen(src); |
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| 100 | dst_len = strlen(dst); |
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| 101 | |||
| 102 | for (i = 0; i < len && i < src_len && i < dst_len; i++) { |
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| 103 | if (src[i] > dst[i]) |
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| 104 | return 1; |
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| 105 | if (src[i] < dst[i]) |
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| 106 | return -1; |
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| 107 | } |
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| 108 | |||
| 109 | return 0; |
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| 110 | } |