sfnew.c revision 3e14f97f673e8a630f076077de35afdd43dc1587
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/***********************************************************************
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* This software is part of the ast package *
3e14f97f673e8a630f076077de35afdd43dc1587Roger A. Faulkner* Copyright (c) 1985-2010 AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* and is licensed under the *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Common Public License, Version 1.0 *
7c2fbfb345896881c631598ee3852ce9ce33fb07April Chin* by AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* A copy of the License is available at *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Information and Software Systems Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* AT&T Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Florham Park NJ *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Glenn Fowler <gsf@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* David Korn <dgk@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Phong Vo <kpv@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin***********************************************************************/
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/* Fundamental function to create a new stream.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin** The argument flags defines the type of stream and the scheme
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin** of buffering.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin** Written by Kiem-Phong Vo.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinSfio_t* sfnew(Sfio_t* oldf, Void_t* buf, size_t size, int file, int flags)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinVoid_t* buf; /* a buffer to read/write, if NULL, will be allocated */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinsize_t size; /* buffer size if buf is given or desired buffer size */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if((f = oldf) )
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin { /* only allow SF_STATIC to be already closed */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin { /* reopening an open stream, close it first */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if(((f->mode&SF_RDWR) != f->mode && _sfmode(f,0,0) < 0) ||
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if(f->data && ((flags&SF_STRING) || size != (size_t)SF_UNBOUND) )
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin { /* reuse a standard stream structure if possible */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin { f = file == 0 ? sfstdin : file == 1 ? sfstdout : sfstderr;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /* create a mutex */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /* stream type */