153 lines
3.5 KiB
C
153 lines
3.5 KiB
C
/* No user fns here. Pesch 15apr92. */
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/*
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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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#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 "local.h"
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static void
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std (ptr, flags, file, data)
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FILE *ptr;
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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->_file = file;
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ptr->_bf._base = 0;
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ptr->_lbfsize = 0;
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ptr->_cookie = ptr;
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ptr->_read = __sread;
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ptr->_write = __swrite;
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ptr->_seek = __sseek;
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ptr->_close = __sclose;
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ptr->_data = data;
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}
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struct _glue *
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__sfmoreglue (d, n)
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struct _reent *d;
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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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__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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if (!d->__sdidinit)
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__sinit (d);
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for (g = &d->__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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d->_errno = ENOMEM;
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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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fp->_data = d;
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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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_cleanup_r (ptr)
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struct _reent *ptr;
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{
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/* (void) _fwalk(fclose); */
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(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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_cleanup ()
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{
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_cleanup_r (_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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__sinit (s)
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struct _reent *s;
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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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std (s->__sf + 0, __SRD, 0, s);
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std (s->__sf + 1, __SWR | __SLBF, 1, s);
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std (s->__sf + 2, __SWR | __SNBF, 2, s);
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s->__sglue._next = NULL;
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s->__sglue._niobs = 3;
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s->__sglue._iobs = &s->__sf[0];
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}
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