| 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>>---read a character (macro) |
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| 21 | |
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| 22 | INDEX |
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| 23 | getchar |
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| 24 | INDEX |
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| 25 | _getchar_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(void); |
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| 30 | |
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| 31 | int _getchar_r(struct _reent *<[reent]>); |
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| 32 | |
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| 33 | DESCRIPTION |
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| 34 | <<getchar>> is a macro, defined in <<stdio.h>>. You can use <<getchar>> |
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| 35 | to get the next single character from the standard input stream. |
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| 36 | As a side effect, <<getchar>> advances the standard input's |
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| 37 | current position indicator. |
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| 38 | |
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| 39 | The alternate function <<_getchar_r>> is a reentrant version. The |
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| 40 | extra argument <[reent]> is a pointer to a reentrancy structure. |
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| 41 | |
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| 42 | |
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| 43 | RETURNS |
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| 44 | The next character (read as an <<unsigned char>>, and cast to |
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| 45 | <<int>>), unless there is no more data, or the host system reports a |
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| 46 | read error; in either of these situations, <<getchar>> returns <<EOF>>. |
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| 47 | |
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| 48 | You can distinguish the two situations that cause an <<EOF>> result by |
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| 49 | using `<<ferror(stdin)>>' and `<<feof(stdin)>>'. |
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| 50 | |
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| 51 | PORTABILITY |
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| 52 | ANSI C requires <<getchar>>; it suggests, but does not require, that |
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| 53 | <<getchar>> 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 | |
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| 59 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 60 | static char sccsid[] = "%W% (Berkeley) %G%"; |
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| 61 | #endif /* LIBC_SCCS and not lint */ |
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| 62 | |
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| 63 | /* |
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| 64 | * A subroutine version of the macro getchar. |
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| 65 | */ |
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| 66 | |
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| 67 | #include <_ansi.h> |
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| 68 | #include <reent.h> |
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| 69 | #include <stdio.h> |
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| 70 | #include "local.h" |
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| 71 | |
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| 72 | #undef getchar |
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| 73 | |
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| 74 | int |
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| 75 | _getchar_r (struct _reent *reent) |
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| 76 | { |
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| 77 | _REENT_SMALL_CHECK_INIT (reent); |
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| 78 | return _getc_r (reent, _stdin_r (reent)); |
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| 79 | } |
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| 80 | |
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| 81 | #ifndef _REENT_ONLY |
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| 82 | |
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| 83 | int |
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| 84 | getchar (void) |
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| 85 | { |
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| 86 | struct _reent *reent = _REENT; |
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| 87 | |
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| 88 | /* CHECK_INIT is called (eventually) by __srefill_r. */ |
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| 89 | _REENT_SMALL_CHECK_INIT (reent); |
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| 90 | return _getc_r (reent, _stdin_r (reent)); |
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| 91 | } |
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| 92 | |
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| 93 | #endif |
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