[444] | 1 | /*####################################################################### |
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| 2 | # RDOS operating system |
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| 3 | # Copyright (C) 1988-2006, Leif Ekblad |
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| 4 | # |
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| 5 | # This library is free software; you can redistribute it and/or modify |
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| 6 | # it under the terms of the GNU Lesser General Public License as published |
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| 7 | # by the Free Software Foundation; either version 2.1 of the License, or |
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| 8 | # (at your option) any later version. |
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| 9 | # |
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| 10 | # This library is distributed in the hope that it will be useful, |
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| 11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | # GNU Lesser General Public License for more details. |
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| 14 | # |
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| 15 | # You should have received a copy of the GNU Lesser General Public |
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| 16 | # License along with this library; if not, write to the Free Software |
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| 17 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 18 | # |
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| 19 | # The author of this program may be contacted at leif@rdos.net |
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| 20 | # |
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| 21 | # lseek.c |
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| 22 | # lseek function implementation |
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| 23 | # |
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| 24 | ##########################################################################*/ |
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| 25 | |
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| 26 | #include "config.h" |
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| 27 | #include <_ansi.h> |
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| 28 | #include <_syslist.h> |
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| 29 | #include <unistd.h> |
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| 30 | #include <errno.h> |
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| 31 | #include <rdos.h> |
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| 32 | |
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| 33 | off_t lseek(int file, off_t pos, int whence) |
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| 34 | { |
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| 35 | off_t temp; |
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| 36 | |
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| 37 | switch (whence) |
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| 38 | { |
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| 39 | case SEEK_CUR: |
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| 40 | temp = RdosGetFilePos(file); |
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| 41 | temp += pos; |
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| 42 | RdosSetFilePos(file, temp); |
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| 43 | return temp; |
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| 44 | |
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| 45 | case SEEK_SET: |
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| 46 | RdosSetFilePos(file, pos); |
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| 47 | return pos; |
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| 48 | |
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| 49 | case SEEK_END: |
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| 50 | temp = RdosGetFilePos(file); |
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| 51 | temp += pos; |
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| 52 | RdosSetFilePos(file, temp); |
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| 53 | return temp; |
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| 54 | |
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| 55 | default: |
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| 56 | errno = EINVAL; |
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| 57 | return - 1; |
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| 58 | } |
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| 59 | } |
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