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| 5215 | serge | 1 | /* _rename.c -- Implementation of the low-level rename() routine |
| 2 | * |
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| 3 | * Copyright (c) 2004 National Semiconductor Corporation |
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| 4 | * |
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| 5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 6 | * and license this software and its documentation for any purpose, provided |
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| 7 | * that existing copyright notices are retained in all copies and that this |
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| 8 | * notice is included verbatim in any distributions. No written agreement, |
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| 9 | * license, or royalty fee is required for any of the authorized uses. |
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| 10 | * Modifications to this software may be copyrighted by their authors |
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| 11 | * and need not follow the licensing terms described here, provided that |
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| 12 | * the new terms are clearly indicated on the first page of each file where |
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| 13 | * they apply. |
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| 14 | */ |
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| 15 | |||
| 16 | #include |
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| 17 | #include |
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| 18 | #include |
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| 19 | #include |
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| 20 | |||
| 21 | int _rename (char *from, char *to) |
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| 22 | { |
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| 23 | void* buf; |
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| 24 | int f_from; |
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| 25 | int f_to; |
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| 26 | int size; |
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| 27 | |||
| 28 | printf("%s from %s to %s\n", __FUNCTION__, |
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| 29 | from, to); |
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| 30 | |||
| 31 | f_from = open(from,O_RDONLY); |
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| 32 | |||
| 33 | if (f_from < 0) |
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| 34 | { |
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| 35 | errno = ENOENT; |
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| 36 | return -1; |
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| 37 | }; |
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| 38 | |||
| 39 | f_to = open(to,O_CREAT|O_WRONLY|O_EXCL); |
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| 40 | |||
| 41 | if (f_to < 0) |
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| 42 | { |
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| 43 | close(f_from); |
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| 44 | errno = EACCES; |
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| 45 | return -1; |
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| 46 | }; |
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| 47 | |||
| 48 | buf = alloca(32768); |
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| 49 | |||
| 50 | do |
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| 51 | { |
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| 52 | size = read(f_from, buf, 32768); |
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| 53 | |||
| 54 | if (size >= 0) |
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| 55 | size = write(f_to, buf, size); |
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| 56 | |||
| 57 | }while (size == 32768); |
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| 58 | |||
| 59 | close(f_to); |
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| 60 | close(f_from); |
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| 61 | |||
| 62 | if (size == -1) |
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| 63 | { |
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| 64 | errno = EACCES; |
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| 65 | return -1; |
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| 66 | }; |
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| 67 | |||
| 68 | remove(from); |
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| 69 | |||
| 70 | return (0); |
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| 71 | }; |