| 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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