[444] | 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 | <<getc>>---read a character (macro) |
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| 21 | |
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| 22 | INDEX |
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| 23 | getc |
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| 24 | INDEX |
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| 25 | _getc_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 getc(FILE *<[fp]>); |
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| 30 | |
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| 31 | #include <stdio.h> |
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| 32 | int _getc_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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| 33 | |
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| 34 | DESCRIPTION |
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| 35 | <<getc>> is a macro, defined in <<stdio.h>>. You can use <<getc>> |
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| 36 | to get the next single character from the file or stream |
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| 37 | identified by <[fp]>. As a side effect, <<getc>> advances the file's |
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| 38 | current position indicator. |
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| 39 | |
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| 40 | For a subroutine version of this macro, see <<fgetc>>. |
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| 41 | |
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| 42 | The <<_getc_r>> function is simply the reentrant version of <<getc>> |
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| 43 | which passes an additional reentrancy structure pointer argument: <[ptr]>. |
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| 44 | |
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| 45 | RETURNS |
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| 46 | The next character (read as an <<unsigned char>>, and cast to |
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| 47 | <<int>>), unless there is no more data, or the host system reports a |
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| 48 | read error; in either of these situations, <<getc>> returns <<EOF>>. |
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| 49 | |
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| 50 | You can distinguish the two situations that cause an <<EOF>> result by |
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| 51 | using the <<ferror>> and <<feof>> functions. |
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| 52 | |
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| 53 | PORTABILITY |
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| 54 | ANSI C requires <<getc>>; it suggests, but does not require, that |
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| 55 | <<getc>> be implemented as a macro. The standard explicitly permits |
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| 56 | macro implementations of <<getc>> to use the argument more than once; |
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| 57 | therefore, in a portable program, you should not use an expression |
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| 58 | with side effects as the <<getc>> argument. |
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| 59 | |
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| 60 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
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| 61 | <<lseek>>, <<read>>, <<sbrk>>, <<write>>. |
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| 62 | */ |
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| 63 | |
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| 64 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 65 | static char sccsid[] = "%W% (Berkeley) %G%"; |
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| 66 | #endif /* LIBC_SCCS and not lint */ |
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| 67 | |
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| 68 | #include <_ansi.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 | /* |
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| 73 | * A subroutine version of the macro getc. |
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| 74 | */ |
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| 75 | |
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| 76 | #undef getc |
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| 77 | |
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| 78 | int |
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| 79 | _getc_r (struct _reent *ptr, |
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| 80 | register FILE *fp) |
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| 81 | { |
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| 82 | int result; |
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| 83 | CHECK_INIT (ptr, fp); |
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| 84 | _newlib_flockfile_start (fp); |
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| 85 | result = __sgetc_r (ptr, fp); |
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| 86 | _newlib_flockfile_end (fp); |
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| 87 | return result; |
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| 88 | } |
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| 89 | |
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| 90 | #ifndef _REENT_ONLY |
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| 91 | |
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| 92 | int |
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| 93 | getc (register FILE *fp) |
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| 94 | { |
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| 95 | int result; |
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| 96 | struct _reent *reent = _REENT; |
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| 97 | |
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| 98 | CHECK_INIT (reent, fp); |
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| 99 | _newlib_flockfile_start (fp); |
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| 100 | result = __sgetc_r (reent, fp); |
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| 101 | _newlib_flockfile_end (fp); |
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| 102 | return result; |
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| 103 | } |
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| 104 | |
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| 105 | #endif /* !_REENT_ONLY */ |
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