scanf.c
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上传日期:2007-01-17
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- /* scanf.c - scan a file. stdio.h */
- /* Copyright 1992-1993 Wind River Systems, Inc. */
- /*
- modification history
- --------------------
- 01c,05mar93,jdi documentation cleanup for 5.1.
- 01b,20sep92,smb documentation additions
- 01a,29jul92,jcf rewritten to usr fioScanV()
- +smb taken from UCB stdio
- */
- /*
- DESCRIPTION
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Chris Torek.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- INCLUDE FILE: stdio.h, stdarg.h
- SEE ALSO: American National Standard X3.159-1989
- NOMANUAL
- */
- #include "vxWorks.h"
- #include "stdarg.h"
- #include "fioLib.h"
- #include "private/stdioP.h"
- /******************************************************************************
- *
- * scanf - read and convert characters from the standard input stream (ANSI)
- *
- * This routine reads input from the standard input stream under the control
- * of the string <fmt>. It is equivalent to fscanf() with an <fp> argument
- * of `stdin'.
- *
- * INCLUDE FILES: stdio.h
- *
- * RETURNS:
- * The number of input items assigned, which can be fewer than provided for,
- * or even zero, in the event of an early matching failure; or EOF if an
- * input failure occurs before any conversion.
- *
- * SEE ALSO: fscanf(), sscanf()
- */
- int scanf
- (
- char const * fmt, /* format string */
- ... /* arguments to format string */
- )
- {
- int nArgs;
- int unget;
- va_list vaList; /* vararg list */
- va_start (vaList, fmt);
- nArgs = fioScanV (fmt, fgetc, (int) stdin, &unget, vaList);
- va_end (vaList);
- if (unget != -1)
- ungetc (unget, stdin);
- return (nArgs);
- }