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/*-
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 * Copyright (c) 1990, 1993
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 *      The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software contributed to Berkeley by
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 * Chris Torek.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *      This product includes software developed by the University of
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 *      California, Berkeley and its contributors.
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 * 4. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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/* MODIFIED:
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 * -- added _THREAD_SAFE an all similar stuff
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 * -- modified initialization and termination
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 */
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)findfp.c    8.2 (Berkeley) 1/4/94";
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#endif
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static const char rcsid[] =
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                "$\Id: findfp.c,v 1.3 1996/06/22 10:33:12 jraynard Exp $";
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#endif /* LIBC_SCCS and not lint */
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#ifdef _THREAD_SAFE
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#include <kernel/func.h>
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#include <kernel/model.h>
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static NOPM_mutexattr_t mutexattr=NOPM_MUTEXATTR_INITIALIZER;
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#endif
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#include <sys/param.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "local.h"
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#include "glue.h"
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/* MG (added =0) */
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int     __sdidinit=0;
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#define NDYNAMIC 10             /* add ten more whenever necessary */
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#define std(flags, file) \
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        {0,0,0,flags,file,{0},0,__sF+file,__sclose,__sread,__sseek,__swrite}
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/*       p r w flags file _bf z  cookie      close    read    seek    write */
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                                /* the usual - (stdin + stdout + stderr) */
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static FILE usual[FOPEN_MAX - 3];
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static struct glue uglue = { 0, FOPEN_MAX - 3, usual };
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FILE __sF[3] = {
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        std(__SRD|__SLBF, STDIN_FILENO),        /* stdin */
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        std(__SWR|__SLBF, STDOUT_FILENO),       /* stdout */
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        std(__SWR|__SNBF, STDERR_FILENO)        /* stderr */
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};
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struct glue __sglue = { &uglue, 3, __sF };
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static struct glue *    moreglue __P((int));
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static struct glue *
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moreglue(n)
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        register int n;
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{
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        register struct glue *g;
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        register FILE *p;
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        static FILE empty;
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        g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE));
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        if (g == NULL)
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                return (NULL);
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        p = (FILE *)ALIGN(g + 1);
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        g->next = NULL;
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        g->niobs = n;
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        g->iobs = p;
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        while (--n >= 0) {
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                *p = empty;
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#ifdef _THREAD_SAFE
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                mutex_init(&p->_mutex,&mutexattr);             
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#endif
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                p++;
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        }
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        return (g);
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}
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/*
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 * Find a free FILE for fopen et al.
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 */
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FILE *
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__sfp()
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{
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        register FILE *fp;
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        register int n;
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        register struct glue *g;
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        if (!__sdidinit)
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                __sinit();
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        for (g = &__sglue;; g = g->next) {
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                for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
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                        if (fp->_flags == 0)
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                                goto found;
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                if (g->next == NULL && (g->next = moreglue(NDYNAMIC)) == NULL)
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                        break;
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        }
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        return (NULL);
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found:
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        fp->_flags = 1;         /* reserve this slot; caller sets real flags */
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        fp->_p = NULL;          /* no current pointer */
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        fp->_w = 0;             /* nothing to read or write */
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        fp->_r = 0;
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        fp->_bf._base = NULL;   /* no buffer */
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        fp->_bf._size = 0;
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        fp->_lbfsize = 0;       /* not line buffered */
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        fp->_file = -1;         /* no file */
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/*      fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
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        fp->_ub._base = NULL;   /* no ungetc buffer */
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        fp->_ub._size = 0;
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        fp->_lb._base = NULL;   /* no line buffer */
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        fp->_lb._size = 0;
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        return (fp);
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}
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/*
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 * XXX.  Force immediate allocation of internal memory.  Not used by stdio,
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 * but documented historically for certain applications.  Bad applications.
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 */
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__warn_references(f_prealloc,
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        "warning: this program uses f_prealloc(), which is stupid.");
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void
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f_prealloc()
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{
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        register struct glue *g;
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        int n;
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        n = getdtablesize() - FOPEN_MAX + 20;           /* 20 for slop. */
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        for (g = &__sglue; (n -= g->niobs) > 0 && g->next; g = g->next)
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                /* void */;
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        if (n > 0)
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                g->next = moreglue(n);
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}
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/*
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 * exit() calls _cleanup() through *__cleanup, set whenever we
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 * open or buffer a file.  This chicanery is done so that programs
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 * that do not use stdio need not link it all in.
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 *
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 * The name `_cleanup' is, alas, fairly well known outside stdio.
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 */
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void
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_cleanup()
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{
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        /* (void) _fwalk(fclose); */
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        (void) _fwalk(__sflush);                /* `cheating' */
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}
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/*
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 * __sinit() is called whenever stdio's internal variables must be set up.
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 */
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void
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__sinit()
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{
190
#ifdef _THREAD_SAFE
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  register FILE *fp;
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  register int n;
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  register struct glue *g;
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#endif
195
 
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  /* make sure we clean up on exit */
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  __cleanup = _cleanup;         /* conservative */
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  __sdidinit = 1;
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#ifdef _THREAD_SAFE
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  for (g = &__sglue;; g = g->next) {
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    for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
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      mutex_init(&fp->_mutex,&mutexattr);
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    if (g->next == NULL) break;
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  }
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#endif
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}