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613 | serge | 1 | /**************************************************************************** |
2 | * |
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3 | * Open Watcom Project |
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4 | * |
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5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
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6 | * |
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7 | * ======================================================================== |
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8 | * |
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9 | * This file contains Original Code and/or Modifications of Original |
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10 | * Code as defined in and that are subject to the Sybase Open Watcom |
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11 | * Public License version 1.0 (the 'License'). You may not use this file |
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12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
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13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
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14 | * provided with the Original Code and Modifications, and is also |
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15 | * available at www.sybase.com/developer/opensource. |
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16 | * |
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17 | * The Original Code and all software distributed under the License are |
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18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
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19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
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20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
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21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
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22 | * NON-INFRINGEMENT. Please see the License for the specific language |
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23 | * governing rights and limitations under the License.* |
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24 | * ======================================================================== |
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25 | * |
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26 | * Description: low level lseek without file extend for Windows NT |
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27 | * |
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28 | ****************************************************************************/ |
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29 | |||
30 | |||
31 | #include "variety.h" |
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32 | #include |
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33 | #include |
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34 | #include "iomode.h" |
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35 | #include "rtcheck.h" |
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36 | #include "seterrno.h" |
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37 | #include "lseek.h" |
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38 | #include "handleio.h" |
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39 | |||
40 | /* |
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41 | DWORD SetFilePointer( |
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42 | HANDLE hFile, // handle to file |
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43 | LONG lDistanceToMove, // bytes to move pointer |
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44 | PLONG lpDistanceToMoveHigh, // bytes to move pointer |
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45 | DWORD dwMoveMethod // starting point |
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46 | ); |
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47 | */ |
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48 | |||
49 | #ifndef INVALID_SET_FILE_POINTER |
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50 | #define INVALID_SET_FILE_POINTER 0xFFFFFFFF |
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51 | #endif |
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52 | |||
53 | typedef struct |
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54 | { |
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55 | char *name; |
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56 | unsigned int offset; |
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57 | }__file_handle; |
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58 | |||
59 | typedef struct |
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60 | { DWORD attr; |
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61 | DWORD flags; |
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62 | DWORD cr_time; |
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63 | DWORD cr_date; |
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64 | DWORD acc_time; |
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65 | DWORD acc_date; |
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66 | DWORD mod_time; |
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67 | DWORD mod_date; |
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68 | DWORD size; |
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69 | DWORD size_high; |
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70 | } FILEINFO; |
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71 | |||
72 | int _stdcall get_fileinfo(const char *name,FILEINFO* pinfo); |
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73 | |||
74 | _WCRTLINK long __lseek( int hid, long offset, int origin ) |
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75 | { |
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76 | __file_handle *fh; |
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77 | long rc; |
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78 | |||
79 | __handle_check( hid, -1 ); |
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80 | fh = (__file_handle*) __getOSHandle( hid ); |
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81 | |||
82 | switch(origin) |
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83 | { |
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84 | case SEEK_SET: |
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85 | rc = offset; |
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86 | break; |
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87 | case SEEK_CUR: |
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88 | rc = fh->offset + offset; |
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89 | break; |
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90 | case SEEK_END: |
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91 | { |
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92 | FILEINFO info; |
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93 | get_fileinfo(fh->name,&info); |
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94 | rc = offset + info.size; |
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95 | break; |
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96 | } |
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97 | default: |
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98 | return -1; |
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99 | }; |
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100 | |||
101 | fh->offset = rc; |
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102 | |||
103 | return( rc ); |
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104 | } |
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105 |