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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [getc.c] - Rev 262
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/* * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* FUNCTION <<getc>>---read a character (macro) INDEX getc INDEX _getc_r ANSI_SYNOPSIS #include <stdio.h> int getc(FILE *<[fp]>); #include <stdio.h> int _getc_r(struct _reent *<[ptr]>, FILE *<[fp]>); TRAD_SYNOPSIS #include <stdio.h> int getc(<[fp]>) FILE *<[fp]>; #include <stdio.h> int _getc_r(<[ptr]>, <[fp]>) struct _reent *<[ptr]>; FILE *<[fp]>; DESCRIPTION <<getc>> is a macro, defined in <<stdio.h>>. You can use <<getc>> to get the next single character from the file or stream identified by <[fp]>. As a side effect, <<getc>> advances the file's current position indicator. For a subroutine version of this macro, see <<fgetc>>. The <<_getc_r>> function is simply the reentrant version of <<getc>> which passes an additional reentrancy structure pointer argument: <[ptr]>. RETURNS The next character (read as an <<unsigned char>>, and cast to <<int>>), unless there is no more data, or the host system reports a read error; in either of these situations, <<getc>> returns <<EOF>>. You can distinguish the two situations that cause an <<EOF>> result by using the <<ferror>> and <<feof>> functions. PORTABILITY ANSI C requires <<getc>>; it suggests, but does not require, that <<getc>> be implemented as a macro. The standard explicitly permits macro implementations of <<getc>> to use the argument more than once; therefore, in a portable program, you should not use an expression with side effects as the <<getc>> argument. Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "%W% (Berkeley) %G%"; #endif /* LIBC_SCCS and not lint */ #include <_ansi.h> #include <stdio.h> #include "local.h" /* * A subroutine version of the macro getc. */ #undef getc int _DEFUN(_getc_r, (ptr, fp), struct _reent *ptr _AND register FILE *fp) { int result; CHECK_INIT (ptr, fp); __sfp_lock_acquire (); _flockfile (fp); result = __sgetc_r (ptr, fp); _funlockfile (fp); __sfp_lock_release (); return result; } #ifndef _REENT_ONLY int _DEFUN(getc, (fp), register FILE *fp) { int result; CHECK_INIT (_REENT, fp); __sfp_lock_acquire (); _flockfile (fp); result = __sgetc_r (_REENT, fp); _funlockfile (fp); __sfp_lock_release (); return result; } #endif /* !_REENT_ONLY */
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