mirror of
https://github.com/autc04/Retro68.git
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295 lines
6.5 KiB
C
295 lines
6.5 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* No user fns here. Pesch 15apr92. */
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/lock.h>
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#include "local.h"
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#ifdef _REENT_SMALL
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const struct __sFILE_fake __sf_fake_stdin =
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{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
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const struct __sFILE_fake __sf_fake_stdout =
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{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
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const struct __sFILE_fake __sf_fake_stderr =
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{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
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#endif
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static _VOID
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_DEFUN(std, (ptr, flags, file, data),
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FILE *ptr _AND
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int flags _AND
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int file _AND
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struct _reent *data)
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{
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ptr->_p = 0;
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ptr->_r = 0;
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ptr->_w = 0;
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ptr->_flags = flags;
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ptr->_flags2 = 0;
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ptr->_file = file;
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ptr->_bf._base = 0;
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ptr->_bf._size = 0;
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ptr->_lbfsize = 0;
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memset (&ptr->_mbstate, 0, sizeof (_mbstate_t));
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ptr->_cookie = ptr;
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ptr->_read = __sread;
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#ifndef __LARGE64_FILES
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ptr->_write = __swrite;
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#else /* __LARGE64_FILES */
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ptr->_write = __swrite64;
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ptr->_seek64 = __sseek64;
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ptr->_flags |= __SL64;
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#endif /* __LARGE64_FILES */
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ptr->_seek = __sseek;
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ptr->_close = __sclose;
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#if !defined(__SINGLE_THREAD__) && !defined(_REENT_SMALL)
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__lock_init_recursive (ptr->_lock);
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/*
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* #else
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* lock is already initialized in __sfp
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*/
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#endif
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#ifdef __SCLE
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if (__stextmode (ptr->_file))
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ptr->_flags |= __SCLE;
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#endif
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}
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struct _glue *
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_DEFUN(__sfmoreglue, (d, n),
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struct _reent *d _AND
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register int n)
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{
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struct _glue *g;
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FILE *p;
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g = (struct _glue *) _malloc_r (d, sizeof (*g) + n * sizeof (FILE));
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if (g == NULL)
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return NULL;
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p = (FILE *) (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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memset (p, 0, n * sizeof (FILE));
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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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_DEFUN(__sfp, (d),
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struct _reent *d)
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{
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FILE *fp;
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int n;
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struct _glue *g;
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__sfp_lock_acquire ();
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if (!_GLOBAL_REENT->__sdidinit)
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__sinit (_GLOBAL_REENT);
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for (g = &_GLOBAL_REENT->__sglue;; g = g->_next)
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{
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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 &&
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(g->_next = __sfmoreglue (d, NDYNAMIC)) == NULL)
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break;
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}
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__sfp_lock_release ();
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d->_errno = ENOMEM;
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return NULL;
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found:
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fp->_file = -1; /* no file */
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fp->_flags = 1; /* reserve this slot; caller sets real flags */
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fp->_flags2 = 0;
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#ifndef __SINGLE_THREAD__
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__lock_init_recursive (fp->_lock);
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#endif
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__sfp_lock_release ();
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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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memset (&fp->_mbstate, 0, sizeof (_mbstate_t));
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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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* 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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_DEFUN(_cleanup_r, (ptr),
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struct _reent *ptr)
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{
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_CAST_VOID _fwalk(ptr, fclose);
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/* _CAST_VOID _fwalk (ptr, fflush); */ /* `cheating' */
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}
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#ifndef _REENT_ONLY
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_VOID
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_DEFUN_VOID(_cleanup)
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{
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_cleanup_r (_GLOBAL_REENT);
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}
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#endif
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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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_DEFUN(__sinit, (s),
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struct _reent *s)
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{
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__sinit_lock_acquire ();
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if (s->__sdidinit)
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{
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__sinit_lock_release ();
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return;
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}
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/* make sure we clean up on exit */
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s->__cleanup = _cleanup_r; /* conservative */
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s->__sdidinit = 1;
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s->__sglue._next = NULL;
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#ifndef _REENT_SMALL
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s->__sglue._niobs = 3;
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s->__sglue._iobs = &s->__sf[0];
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#else
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s->__sglue._niobs = 0;
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s->__sglue._iobs = NULL;
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s->_stdin = __sfp(s);
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s->_stdout = __sfp(s);
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s->_stderr = __sfp(s);
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#endif
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std (s->_stdin, __SRD, 0, s);
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/* On platforms that have true file system I/O, we can verify
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whether stdout is an interactive terminal or not, as part of
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__smakebuf on first use of the stream. For all other platforms,
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we will default to line buffered mode here. Technically, POSIX
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requires both stdin and stdout to be line-buffered, but tradition
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leaves stdin alone on systems without fcntl. */
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#ifdef HAVE_FCNTL
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std (s->_stdout, __SWR, 1, s);
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#else
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std (s->_stdout, __SWR | __SLBF, 1, s);
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#endif
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/* POSIX requires stderr to be opened for reading and writing, even
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when the underlying fd 2 is write-only. */
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std (s->_stderr, __SRW | __SNBF, 2, s);
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__sinit_lock_release ();
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}
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#ifndef __SINGLE_THREAD__
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__LOCK_INIT_RECURSIVE(static, __sfp_lock);
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__LOCK_INIT_RECURSIVE(static, __sinit_lock);
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_VOID
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_DEFUN_VOID(__sfp_lock_acquire)
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{
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__lock_acquire_recursive (__sfp_lock);
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}
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_VOID
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_DEFUN_VOID(__sfp_lock_release)
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{
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__lock_release_recursive (__sfp_lock);
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}
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_VOID
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_DEFUN_VOID(__sinit_lock_acquire)
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{
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__lock_acquire_recursive (__sinit_lock);
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}
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_VOID
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_DEFUN_VOID(__sinit_lock_release)
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{
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__lock_release_recursive (__sinit_lock);
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}
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/* Walkable file locking routine. */
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static int
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_DEFUN(__fp_lock, (ptr),
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FILE * ptr)
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{
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_flockfile (ptr);
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return 0;
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}
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/* Walkable file unlocking routine. */
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static int
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_DEFUN(__fp_unlock, (ptr),
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FILE * ptr)
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{
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_funlockfile (ptr);
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return 0;
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}
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_VOID
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_DEFUN_VOID(__fp_lock_all)
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{
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__sfp_lock_acquire ();
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_CAST_VOID _fwalk (_REENT, __fp_lock);
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}
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_VOID
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_DEFUN_VOID(__fp_unlock_all)
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{
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_CAST_VOID _fwalk (_REENT, __fp_unlock);
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__sfp_lock_release ();
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}
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#endif
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