1 | /* |
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2 | * Copyright (c) 1990 The Regents of the University of California. |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms are permitted |
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6 | * provided that the above copyright notice and this paragraph are |
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7 | * duplicated in all such forms and that any documentation, |
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8 | * advertising materials, and other materials related to such |
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9 | * distribution and use acknowledge that the software was developed |
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10 | * by the University of California, Berkeley. The name of the |
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11 | * University may not be used to endorse or promote products derived |
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12 | * from this software without specific prior written permission. |
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13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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16 | */ |
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17 | |
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18 | /* |
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19 | FUNCTION |
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20 | <<getchar_unlocked>>---non-thread-safe version of getchar (macro) |
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21 | |
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22 | INDEX |
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23 | getchar_unlocked |
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24 | INDEX |
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25 | _getchar_unlocked_r |
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26 | |
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27 | SYNOPSIS |
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28 | #include <stdio.h> |
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29 | int getchar_unlocked(void); |
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30 | |
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31 | #include <stdio.h> |
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32 | int _getchar_unlocked_r(struct _reent *<[ptr]>); |
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33 | |
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34 | DESCRIPTION |
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35 | <<getchar_unlocked>> is a non-thread-safe version of <<getchar>> |
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36 | declared in <<stdio.h>>. <<getchar_unlocked>> may only safely be used |
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37 | within a scope protected by flockfile() (or ftrylockfile()) and |
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38 | funlockfile(). These functions may safely be used in a multi-threaded |
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39 | program if and only if they are called while the invoking thread owns |
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40 | the ( FILE *) object, as is the case after a successful call to the |
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41 | flockfile() or ftrylockfile() functions. If threads are disabled, |
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42 | then <<getchar_unlocked>> is equivalent to <<getchar>>. |
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43 | |
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44 | The <<_getchar_unlocked_r>> function is simply the reentrant version of |
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45 | <<getchar_unlocked>> which passes an addtional reentrancy structure pointer |
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46 | argument: <[ptr]>. |
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47 | |
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48 | RETURNS |
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49 | See <<getchar>>. |
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50 | |
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51 | PORTABILITY |
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52 | POSIX 1003.1 requires <<getchar_unlocked>>. <<getchar_unlocked>> may |
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53 | be implemented as a macro. |
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54 | |
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55 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
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56 | <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */ |
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57 | |
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58 | #if defined(LIBC_SCCS) && !defined(lint) |
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59 | static char sccsid[] = "%W% (Berkeley) %G%"; |
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60 | #endif /* LIBC_SCCS and not lint */ |
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61 | |
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62 | /* |
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63 | * A subroutine version of the macro getchar_unlocked. |
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64 | */ |
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65 | |
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66 | #include <_ansi.h> |
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67 | #include <reent.h> |
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68 | #include <stdio.h> |
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69 | |
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70 | #undef getchar_unlocked |
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71 | |
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72 | int |
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73 | _getchar_unlocked_r (struct _reent *ptr) |
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74 | { |
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75 | return _getc_unlocked_r (ptr, _stdin_r (ptr)); |
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76 | } |
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77 | |
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78 | #ifndef _REENT_ONLY |
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79 | |
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80 | int |
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81 | getchar_unlocked (void) |
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82 | { |
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83 | /* CHECK_INIT is called (eventually) by __srefill_r. */ |
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84 | |
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85 | return _getc_unlocked_r (_REENT, _stdin_r (_REENT)); |
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86 | } |
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87 | |
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88 | #endif |
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