1 | /* |
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2 | FUNCTION |
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3 | <<fsetpos64>>---restore position of a large stream or file |
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4 | |
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5 | INDEX |
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6 | fsetpos64 |
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7 | INDEX |
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8 | _fsetpos64_r |
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9 | |
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10 | SYNOPSIS |
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11 | #include <stdio.h> |
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12 | int fsetpos64(FILE *<[fp]>, const _fpos64_t *<[pos]>); |
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13 | int _fsetpos64_r(struct _reent *<[ptr]>, FILE *<[fp]>, |
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14 | const _fpos64_t *<[pos]>); |
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15 | |
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16 | DESCRIPTION |
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17 | Objects of type <<FILE>> can have a ``position'' that records how much |
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18 | of the file your program has already read. Many of the <<stdio>> functions |
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19 | depend on this position, and many change it as a side effect. |
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20 | |
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21 | You can use <<fsetpos64>> to return the large file identified by <[fp]> to a |
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22 | previous position <<*<[pos]>>> (after first recording it with <<fgetpos64>>). |
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23 | |
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24 | See <<fseeko64>> for a similar facility. |
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25 | |
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26 | RETURNS |
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27 | <<fgetpos64>> returns <<0>> when successful. If <<fgetpos64>> fails, the |
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28 | result is <<1>>. The reason for failure is indicated in <<errno>>: |
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29 | either <<ESPIPE>> (the stream identified by <[fp]> doesn't support |
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30 | 64-bit repositioning) or <<EINVAL>> (invalid file position). |
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31 | |
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32 | PORTABILITY |
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33 | <<fsetpos64>> is a glibc extension. |
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34 | |
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35 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
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36 | <<lseek64>>, <<read>>, <<sbrk>>, <<write>>. |
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37 | */ |
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38 | |
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39 | #include <stdio.h> |
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40 | |
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41 | #ifdef __LARGE64_FILES |
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42 | |
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43 | int |
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44 | _fsetpos64_r (struct _reent *ptr, |
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45 | FILE * iop, |
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46 | const _fpos64_t * pos) |
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47 | { |
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48 | int x = _fseeko64_r (ptr, iop, (_off64_t)(*pos), SEEK_SET); |
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49 | |
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50 | if (x != 0) |
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51 | return 1; |
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52 | return 0; |
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53 | } |
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54 | |
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55 | #ifndef _REENT_ONLY |
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56 | |
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57 | int |
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58 | fsetpos64 (FILE * iop, |
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59 | const _fpos64_t * pos) |
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60 | { |
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61 | return _fsetpos64_r (_REENT, iop, pos); |
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62 | } |
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63 | |
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64 | #endif /* !_REENT_ONLY */ |
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65 | |
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66 | #endif /* __LARGE64_FILES */ |
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