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 | <<putchar_unlocked>>---non-thread-safe version of putchar (macro) |
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21 | |
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22 | INDEX |
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23 | putchar_unlocked |
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24 | |
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25 | SYNOPSIS |
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26 | #include <stdio.h> |
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27 | int putchar_unlocked(int <[ch]>); |
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28 | |
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29 | DESCRIPTION |
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30 | <<putchar_unlocked>> is a non-thread-safe version of <<putchar>> |
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31 | declared in <<stdio.h>>. <<putchar_unlocked>> may only safely be used |
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32 | within a scope protected by flockfile() (or ftrylockfile()) and |
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33 | funlockfile(). These functions may safely be used in a multi-threaded |
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34 | program if and only if they are called while the invoking thread owns |
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35 | the ( FILE *) object, as is the case after a successful call to the |
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36 | flockfile() or ftrylockfile() functions. If threads are disabled, |
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37 | then <<putchar_unlocked>> is equivalent to <<putchar>>. |
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38 | |
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39 | RETURNS |
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40 | See <<putchar>>. |
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41 | |
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42 | PORTABILITY |
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43 | POSIX 1003.1 requires <<putchar_unlocked>>. <<putchar_unlocked>> may |
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44 | be implemented as a macro. |
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45 | |
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46 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
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47 | <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */ |
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48 | |
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49 | #if defined(LIBC_SCCS) && !defined(lint) |
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50 | static char sccsid[] = "%W% (Berkeley) %G%"; |
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51 | #endif /* LIBC_SCCS and not lint */ |
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52 | |
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53 | /* |
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54 | * A subroutine version of the macro putchar_unlocked. |
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55 | */ |
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56 | |
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57 | #include <_ansi.h> |
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58 | #include <reent.h> |
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59 | #include <stdio.h> |
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60 | |
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61 | #undef putchar_unlocked |
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62 | |
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63 | int |
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64 | _putchar_unlocked_r (struct _reent *ptr, |
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65 | int c) |
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66 | { |
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67 | return putc_unlocked (c, _stdout_r (ptr)); |
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68 | } |
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69 | |
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70 | #ifndef _REENT_ONLY |
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71 | |
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72 | int |
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73 | putchar_unlocked (int c) |
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74 | { |
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75 | /* CHECK_INIT is (eventually) called by __swbuf. */ |
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76 | |
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77 | return _putchar_unlocked_r (_REENT, c); |
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78 | } |
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79 | |
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80 | #endif |
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