File: [local] / prex-old / usr / lib / libc / stdio / findfp.c (download)
Revision 1.1.1.1 (vendor branch), Tue Jun 3 09:38:48 2008 UTC (16 years, 2 months ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, PREX_0_7_BASE, HEAD Changes since 1.1: +0 -0 lines
Yeah, this is an initial import of Prex, portable real-time microkernel
operating system. I wanna hack it for non-profit but fun, so let it in.
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/*-
* Copyright (c) 1990, 1993
* 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. 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 <sys/param.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "local.h"
int __sdidinit;
#define std(next, flags, file) \
{next,NULL,0,0,flags,file,{0,0},{0,0},NULL,0,{0},{0}}
/* p r w flags file _bf z */
FILE __sF[3] = {
std(&__sF[1], __SRD, STDIN_FILENO),
std(&__sF[2], __SWR, STDOUT_FILENO),
std(NULL, __SWR|__SNBF, STDERR_FILENO)
};
/*
* Find a free FILE for fopen et al.
*/
FILE *
__sfp()
{
FILE *fp, *tmp;
if (!__sdidinit)
__sinit();
for (fp = &__sF[0];; fp = fp->next) {
if (fp->_flags == 0)
goto found;
if (fp->next == NULL) {
if ((tmp = malloc(sizeof(FILE))) == NULL)
break;
tmp->next = NULL;
fp->next = tmp;
fp = tmp;
goto found;
}
}
return (NULL);
found:
fp->_flags = 1; /* reserve this slot; caller sets real flags */
fp->_p = NULL; /* no current pointer */
fp->_w = 0; /* nothing to read or write */
fp->_r = 0;
fp->_bf._base = NULL; /* no buffer */
fp->_bf._size = 0;
fp->_file = -1; /* no file */
fp->_ub._base = NULL; /* no ungetc buffer */
fp->_ub._size = 0;
return (fp);
}
/*
* exit() calls _cleanup() through *__cleanup, set whenever we
* open or buffer a file. This chicanery is done so that programs
* that do not use stdio need not link it all in.
*
* The name `_cleanup' is, alas, fairly well known outside stdio.
b */
void
_cleanup()
{
/* (void) _fwalk(fclose); */
(void) _fwalk(__sflush); /* `cheating' */
}
/*
* __sinit() is called whenever stdio's internal variables must be set up.
*/
void
__sinit()
{
/* make sure we clean up on exit */
__cleanup = _cleanup; /* conservative */
__sdidinit = 1;
}