[444] | 1 | /* |
---|
| 2 | * Copyright (c) 1990 The Regents of the University of California. |
---|
| 3 | * All rights reserved. |
---|
| 4 | * |
---|
| 5 | * Redistribution and use in source and binary forms are permitted |
---|
| 6 | * provided that the above copyright notice and this paragraph are |
---|
| 7 | * duplicated in all such forms and that any documentation, |
---|
| 8 | * advertising materials, and other materials related to such |
---|
| 9 | * distribution and use acknowledge that the software was developed |
---|
| 10 | * by the University of California, Berkeley. The name of the |
---|
| 11 | * University may not be used to endorse or promote products derived |
---|
| 12 | * from this software without specific prior written permission. |
---|
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
---|
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
---|
| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
---|
| 16 | */ |
---|
| 17 | |
---|
| 18 | /* |
---|
| 19 | FUNCTION |
---|
| 20 | <<getchar>>---read a character (macro) |
---|
| 21 | |
---|
| 22 | INDEX |
---|
| 23 | getchar |
---|
| 24 | INDEX |
---|
| 25 | _getchar_r |
---|
| 26 | |
---|
| 27 | SYNOPSIS |
---|
| 28 | #include <stdio.h> |
---|
| 29 | int getchar(void); |
---|
| 30 | |
---|
| 31 | int _getchar_r(struct _reent *<[reent]>); |
---|
| 32 | |
---|
| 33 | DESCRIPTION |
---|
| 34 | <<getchar>> is a macro, defined in <<stdio.h>>. You can use <<getchar>> |
---|
| 35 | to get the next single character from the standard input stream. |
---|
| 36 | As a side effect, <<getchar>> advances the standard input's |
---|
| 37 | current position indicator. |
---|
| 38 | |
---|
| 39 | The alternate function <<_getchar_r>> is a reentrant version. The |
---|
| 40 | extra argument <[reent]> is a pointer to a reentrancy structure. |
---|
| 41 | |
---|
| 42 | |
---|
| 43 | RETURNS |
---|
| 44 | The next character (read as an <<unsigned char>>, and cast to |
---|
| 45 | <<int>>), unless there is no more data, or the host system reports a |
---|
| 46 | read error; in either of these situations, <<getchar>> returns <<EOF>>. |
---|
| 47 | |
---|
| 48 | You can distinguish the two situations that cause an <<EOF>> result by |
---|
| 49 | using `<<ferror(stdin)>>' and `<<feof(stdin)>>'. |
---|
| 50 | |
---|
| 51 | PORTABILITY |
---|
| 52 | ANSI C requires <<getchar>>; it suggests, but does not require, that |
---|
| 53 | <<getchar>> be implemented as a macro. |
---|
| 54 | |
---|
| 55 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
---|
| 56 | <<lseek>>, <<read>>, <<sbrk>>, <<write>>. |
---|
| 57 | */ |
---|
| 58 | |
---|
| 59 | #if defined(LIBC_SCCS) && !defined(lint) |
---|
| 60 | static char sccsid[] = "%W% (Berkeley) %G%"; |
---|
| 61 | #endif /* LIBC_SCCS and not lint */ |
---|
| 62 | |
---|
| 63 | /* |
---|
| 64 | * A subroutine version of the macro getchar. |
---|
| 65 | */ |
---|
| 66 | |
---|
| 67 | #include <_ansi.h> |
---|
| 68 | #include <reent.h> |
---|
| 69 | #include <stdio.h> |
---|
| 70 | #include "local.h" |
---|
| 71 | |
---|
| 72 | #undef getchar |
---|
| 73 | |
---|
| 74 | int |
---|
| 75 | _getchar_r (struct _reent *reent) |
---|
| 76 | { |
---|
| 77 | _REENT_SMALL_CHECK_INIT (reent); |
---|
| 78 | return _getc_r (reent, _stdin_r (reent)); |
---|
| 79 | } |
---|
| 80 | |
---|
| 81 | #ifndef _REENT_ONLY |
---|
| 82 | |
---|
| 83 | int |
---|
| 84 | getchar (void) |
---|
| 85 | { |
---|
| 86 | struct _reent *reent = _REENT; |
---|
| 87 | |
---|
| 88 | /* CHECK_INIT is called (eventually) by __srefill_r. */ |
---|
| 89 | _REENT_SMALL_CHECK_INIT (reent); |
---|
| 90 | return _getc_r (reent, _stdin_r (reent)); |
---|
| 91 | } |
---|
| 92 | |
---|
| 93 | #endif |
---|