Last change
on this file since 39a696b was 6262b5c, checked in by Thomas Lopatic <thomas@…>, 7 years ago |
Added include files for global functions and variables.
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File size:
1008 bytes
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1 | /*
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2 | =============================================================================
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3 | posit.c -- position a file to a specific relative sector
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4 | Version 4 -- 1987-06-29 -- D.N. Lynx Crowe
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5 | =============================================================================
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6 | */
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7 |
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8 | #include "all.h"
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9 |
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10 | extern int16_t _seek(struct fcb *fcp);
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11 |
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12 | /*
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13 | =============================================================================
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14 | posit(fd, pos) -- position file 'fd' at sector 'pos'.
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15 | =============================================================================
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16 | */
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17 |
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18 | int16_t posit(int16_t fd, uint16_t pos)
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19 | {
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20 | register struct fcb *fp;
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21 |
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22 | if ((fd < 0) OR (fd > MAXCHAN)) {
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23 |
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24 | errno = EBADF;
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25 | return(FAILURE);
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26 | }
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27 |
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28 | fp = chantab[fd].c_arg;
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29 |
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30 | if ((chantab[fd].c_seek EQ 0)
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31 | OR ((pos << FILESHFT) > fp->curlen)) {
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32 |
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33 | errno = EINVAL;
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34 | fp->modefl |= FC_ERR;
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35 | return(FAILURE);
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36 | }
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37 |
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38 | fp->curlsn = pos;
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39 | fp->offset = 0;
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40 |
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41 | if (_seek(fp) < 0) {
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42 |
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43 | errno = EIO;
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44 | fp->modefl |= FC_ERR;
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45 | return(FAILURE);
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46 | }
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47 |
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48 | return(SUCCESS);
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49 | }
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50 |
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