1 | /* No user fns here. Pesch 15apr92. */ |
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2 | |
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3 | /* |
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4 | * Copyright (c) 1990, 2007 The Regents of the University of California. |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms are permitted |
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8 | * provided that the above copyright notice and this paragraph are |
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9 | * duplicated in all such forms and that any documentation, |
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10 | * advertising materials, and other materials related to such |
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11 | * distribution and use acknowledge that the software was developed |
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12 | * by the University of California, Berkeley. The name of the |
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13 | * University may not be used to endorse or promote products derived |
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14 | * from this software without specific prior written permission. |
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15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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17 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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18 | */ |
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19 | |
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20 | #include <_ansi.h> |
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21 | #include <stdio.h> |
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22 | #include <stdlib.h> |
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23 | #include <errno.h> |
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24 | #include "local.h" |
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25 | |
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26 | /* |
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27 | * Various output routines call wsetup to be sure it is safe to write, |
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28 | * because either _flags does not include __SWR, or _buf is NULL. |
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29 | * _wsetup returns 0 if OK to write, nonzero and set errno otherwise. |
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30 | */ |
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31 | |
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32 | int |
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33 | __swsetup_r (struct _reent *ptr, |
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34 | register FILE * fp) |
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35 | { |
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36 | /* Make sure stdio is set up. */ |
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37 | |
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38 | CHECK_INIT (_REENT, fp); |
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39 | |
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40 | /* |
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41 | * If we are not writing, we had better be reading and writing. |
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42 | */ |
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43 | |
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44 | if ((fp->_flags & __SWR) == 0) |
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45 | { |
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46 | if ((fp->_flags & __SRW) == 0) |
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47 | { |
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48 | ptr->_errno = EBADF; |
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49 | fp->_flags |= __SERR; |
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50 | return EOF; |
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51 | } |
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52 | if (fp->_flags & __SRD) |
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53 | { |
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54 | /* clobber any ungetc data */ |
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55 | if (HASUB (fp)) |
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56 | FREEUB (ptr, fp); |
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57 | fp->_flags &= ~(__SRD | __SEOF); |
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58 | fp->_r = 0; |
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59 | fp->_p = fp->_bf._base; |
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60 | } |
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61 | fp->_flags |= __SWR; |
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62 | } |
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63 | |
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64 | /* |
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65 | * Make a buffer if necessary, then set _w. |
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66 | * A string I/O file should not explicitly allocate a buffer |
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67 | * unless asprintf is being used. |
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68 | */ |
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69 | if (fp->_bf._base == NULL |
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70 | && (!(fp->_flags & __SSTR) || (fp->_flags & __SMBF))) |
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71 | __smakebuf_r (ptr, fp); |
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72 | |
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73 | if (fp->_flags & __SLBF) |
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74 | { |
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75 | /* |
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76 | * It is line buffered, so make _lbfsize be -_bufsize |
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77 | * for the putc() macro. We will change _lbfsize back |
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78 | * to 0 whenever we turn off __SWR. |
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79 | */ |
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80 | fp->_w = 0; |
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81 | fp->_lbfsize = -fp->_bf._size; |
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82 | } |
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83 | else |
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84 | fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size; |
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85 | |
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86 | if (!fp->_bf._base && (fp->_flags & __SMBF)) |
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87 | { |
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88 | /* __smakebuf_r set errno, but not flag */ |
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89 | fp->_flags |= __SERR; |
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90 | return EOF; |
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91 | } |
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92 | return 0; |
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93 | } |
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