sprintf.c

来自「上一个上传的有问题,这个是好的。visopsys包括系统内核和GUI的全部SOU」· C语言 代码 · 共 50 行

// 
//  Visopsys
//  Copyright (C) 1998-2007 J. Andrew McLaughlin
//  
//  This library is free software; you can redistribute it and/or modify it
//  under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation; either version 2.1 of the License, or (at
//  your option) any later version.
//
//  This library is distributed in the hope that it will be useful, but
//  WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
//  General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public License
//  along with this library; if not, write to the Free Software Foundation,
//  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
//  sprintf.c
//

// This is the standard "sprintf" function, as found in standard C libraries

#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <sys/cdefs.h>


int sprintf(char *output, const char *format, ...)
{
  // This function will construct a single string out of the format
  // string and arguments that are passed.  Returns the number of
  // characters copied to the output string.

  va_list list;
  int len = 0;

  // Initialize the argument list
  va_start(list, format);

  // Fill out the output line based on 
  len = _xpndfmt(output, MAXSTRINGLENGTH, format, list);

  va_end(list);

  // Return the number of characters we wrote to the string
  return (len);
}