minix/lib/libc/stdio/findfp.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

213 lines
5.9 KiB
C

/* $NetBSD: findfp.c,v 1.25 2010/09/06 14:52:55 christos Exp $ */
/*-
* 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/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)findfp.c 8.2 (Berkeley) 1/4/94";
#else
__RCSID("$NetBSD: findfp.c,v 1.25 2010/09/06 14:52:55 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "reentrant.h"
#include "local.h"
#include "glue.h"
int __sdidinit;
#define NDYNAMIC 10 /* add ten more whenever necessary */
#define std(flags, file) \
/* p r w flags file bf lfbsize cookie close */ \
{ NULL, 0, 0, flags, file, { NULL, 0 }, 0, __sF + file, __sclose, \
/* read seek write ext up */ \
__sread, __sseek, __swrite, { (void *)(__sFext + file), 0 }, NULL, \
/* ur ubuf, nbuf lb blksize offset */ \
0, { '\0', '\0', '\0' }, { '\0' }, { NULL, 0 }, 0, (fpos_t)0 }
/* the usual - (stdin + stdout + stderr) */
static FILE usual[FOPEN_MAX - 3];
static struct __sfileext usualext[FOPEN_MAX - 3];
static struct glue uglue = { 0, FOPEN_MAX - 3, usual };
#if defined(_REENTRANT) && !defined(__lint__) /* XXX lint is busted */
#define STDEXT { ._lock = MUTEX_INITIALIZER, ._lockcond = COND_INITIALIZER }
struct __sfileext __sFext[3] = { STDEXT,
STDEXT,
STDEXT};
#else
struct __sfileext __sFext[3];
#endif
FILE __sF[3] = {
std(__SRD, STDIN_FILENO), /* stdin */
std(__SWR, STDOUT_FILENO), /* stdout */
std(__SWR|__SNBF, STDERR_FILENO) /* stderr */
};
struct glue __sglue = { &uglue, 3, __sF };
static struct glue *moreglue __P((int));
void f_prealloc __P((void));
#ifdef _REENTRANT
rwlock_t __sfp_lock = RWLOCK_INITIALIZER;
#endif
static struct glue *
moreglue(n)
int n;
{
struct glue *g;
FILE *p;
struct __sfileext *pext;
static FILE empty;
g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE)
+ n * sizeof(struct __sfileext));
if (g == NULL)
return (NULL);
p = (FILE *)ALIGN((u_long)(g + 1));
g->next = NULL;
g->niobs = n;
g->iobs = p;
pext = (void *)(p + n);
while (--n >= 0) {
*p = empty;
_FILEEXT_SETUP(p, pext);
p++;
pext++;
}
return (g);
}
void
__sfpinit(FILE *fp)
{
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->_lbfsize = 0; /* not line buffered */
fp->_file = -1; /* no file */
/* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
_UB(fp)._base = NULL; /* no ungetc buffer */
_UB(fp)._size = 0;
memset(WCIO_GET(fp), 0, sizeof(struct wchar_io_data));
}
/*
* Find a free FILE for fopen et al.
*/
FILE *
__sfp()
{
FILE *fp;
int n;
struct glue *g;
if (!__sdidinit)
__sinit();
rwlock_wrlock(&__sfp_lock);
for (g = &__sglue;; g = g->next) {
for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
if (fp->_flags == 0)
goto found;
if (g->next == NULL && (g->next = moreglue(NDYNAMIC)) == NULL)
break;
}
rwlock_unlock(&__sfp_lock);
return (NULL);
found:
__sfpinit(fp);
rwlock_unlock(&__sfp_lock);
return (fp);
}
/*
* XXX. Force immediate allocation of internal memory. Not used by stdio,
* but documented historically for certain applications. Bad applications.
*/
void
f_prealloc()
{
struct glue *g;
int n;
n = (int)sysconf(_SC_OPEN_MAX) - FOPEN_MAX + 20; /* 20 for slop. */
for (g = &__sglue; (n -= g->niobs) > 0 && g->next; g = g->next)
/* void */;
if (n > 0)
g->next = moreglue(n);
}
/*
* 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.
*/
void
_cleanup()
{
/* (void) _fwalk(fclose); */
(void) fflush(NULL); /* `cheating' */
}
/*
* __sinit() is called whenever stdio's internal variables must be set up.
*/
void
__sinit()
{
int i;
for (i = 0; i < FOPEN_MAX - 3; i++)
_FILEEXT_SETUP(&usual[i], &usualext[i]);
/* make sure we clean up on exit */
__cleanup = _cleanup; /* conservative */
__sdidinit = 1;
}