1/*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without

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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)findfp.c 8.2 (Berkeley) 1/4/94";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/lib/libc/stdio/findfp.c 178287 2008-04-17 22:17:54Z jhb $");
38
39#include <sys/param.h>
40#include <machine/atomic.h>
41#include <unistd.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45
46#include <spinlock.h>
47
48#include "libc_private.h"
49#include "local.h"
50#include "glue.h"
51
52int __sdidinit;
53
54#define NDYNAMIC 10 /* add ten more whenever necessary */
55
56#define std(flags, file) \
57 {0,0,0,flags,file,{0},0,__sF+file,__sclose,__sread,__sseek,__swrite}
58 /* p r w flags file _bf z cookie close read seek write */
59
60 /* the usual - (stdin + stdout + stderr) */
61static FILE usual[FOPEN_MAX - 3];
62static struct glue uglue = { NULL, FOPEN_MAX - 3, usual };
63
64static FILE __sF[3] = {
65 std(__SRD, STDIN_FILENO),
66 std(__SWR, STDOUT_FILENO),
67 std(__SWR|__SNBF, STDERR_FILENO)
68};
69
70FILE *__stdinp = &__sF[0];
71FILE *__stdoutp = &__sF[1];
72FILE *__stderrp = &__sF[2];
73
74struct glue __sglue = { &uglue, 3, __sF };
75static struct glue *lastglue = &uglue;
76
77static struct glue * moreglue(int);

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87#endif
88
89static struct glue *
90moreglue(n)
91 int n;
92{
93 struct glue *g;
94 static FILE empty;
95 FILE *p;
96
97 g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE));
98 if (g == NULL)
99 return (NULL);
100 p = (FILE *)ALIGN(g + 1);
101 g->next = NULL;
102 g->niobs = n;
103 g->iobs = p;
104 while (--n >= 0)
105 *p++ = empty;
106 return (g);
107}
108
109/*
110 * Find a free FILE for fopen et al.
111 */
112FILE *
113__sfp()

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145 fp->_lbfsize = 0; /* not line buffered */
146 fp->_file = -1; /* no file */
147/* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
148 fp->_ub._base = NULL; /* no ungetc buffer */
149 fp->_ub._size = 0;
150 fp->_lb._base = NULL; /* no line buffer */
151 fp->_lb._size = 0;
152/* fp->_lock = NULL; */ /* once set always set (reused) */
153 fp->_orientation = 0;
154 memset(&fp->_mbstate, 0, sizeof(mbstate_t));
155 return (fp);
156}
157
158/*
159 * XXX. Force immediate allocation of internal memory. Not used by stdio,
160 * but documented historically for certain applications. Bad applications.
161 */
162__warn_references(f_prealloc,

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199}
200
201/*
202 * __sinit() is called whenever stdio's internal variables must be set up.
203 */
204void
205__sinit()
206{
207
208 /* Make sure we clean up on exit. */
209 __cleanup = _cleanup; /* conservative */
210 __sdidinit = 1;
211}