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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/stdio/findfp.c	Lines:	27	53	50.9 %
Date:	2017-11-13	Branches:	13	30	43.3 %


/*	$OpenBSD: findfp.c,v 1.19 2016/04/05 04:29:21 guenther 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/param.h>	/* ALIGN */
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "local.h"
#include "glue.h"
#include "thread_private.h"

int	__sdidinit;

#define	NDYNAMIC 10		/* add ten more whenever necessary */

#define	std(flags, file) \
	{0,0,0,flags,file,{0},0,__sF+file,__sclose,__sread,__sseek,__swrite, \
	 {(unsigned char *)(__sFext+file), 0}}
/*	 p r w flags file _bf z  cookie      close    read    seek    write
	 ext */

				/* 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 };
static struct glue *lastglue = &uglue;
static void *sfp_mutex;

static struct __sfileext __sFext[3];
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(int n)
{
	struct glue *g;
	FILE *p;
	struct __sfileext *pext;
	static FILE empty;
	char *data;

	data = malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE)
	    + n * sizeof(struct __sfileext));
	if (data == NULL)
		return (NULL);
	g = (struct glue *)data;
	p = (FILE *)ALIGN(data + sizeof(*g));
	pext = (struct __sfileext *)
	    (ALIGN(data + sizeof(*g)) + n * sizeof(FILE));
	g->next = NULL;
	g->niobs = n;
	g->iobs = p;
	while (--n >= 0) {
		*p = empty;
		_FILEEXT_SETUP(p, pext);
		p++;
		pext++;
	}
	return (g);
}

/*
 * Find a free FILE for fopen et al.
 */
FILE *
__sfp(void)
{
	FILE *fp;
	int n;
	struct glue *g;

	if (!__sdidinit)
		__sinit();

	_MUTEX_LOCK(&sfp_mutex);
	for (g = &__sglue; g != NULL; g = g->next) {
		for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
			if (fp->_flags == 0)
				goto found;
	}

	/* release lock while mallocing */
	_MUTEX_UNLOCK(&sfp_mutex);
	if ((g = moreglue(NDYNAMIC)) == NULL)
		return (NULL);
	_MUTEX_LOCK(&sfp_mutex);
	lastglue->next = g;
	lastglue = g;
	fp = g->iobs;
found:
	fp->_flags = 1;		/* reserve this slot; caller sets real flags */
	_MUTEX_UNLOCK(&sfp_mutex);
	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 */
	fp->_lb._base = NULL;	/* no line buffer */
	fp->_lb._size = 0;
	_FILEEXT_INIT(fp);
	return (fp);
}

/*
 * exit() calls _cleanup() through the callback registered
 * with __atexit_register_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)
{
	/* (void) _fwalk(fclose); */
	(void) _fwalk(__sflush);		/* `cheating' */
}

/*
 * __sinit() is called whenever stdio's internal variables must be set up.
 */
void
__sinit(void)
{
	static void *sinit_mutex;
	int i;

	_MUTEX_LOCK(&sinit_mutex);
	if (__sdidinit)
		goto out;	/* bail out if caller lost the race */
	for (i = 0; i < FOPEN_MAX - 3; i++) {
		_FILEEXT_SETUP(usual+i, usualext+i);
	}
	/* make sure we clean up on exit */
	__atexit_register_cleanup(_cleanup); /* conservative */
	__sdidinit = 1;
out:
	_MUTEX_UNLOCK(&sinit_mutex);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: findfp.c,v 1.19 2016/04/05 04:29:21 guenther Exp $ */
2			/*-
3			* Copyright (c) 1990, 1993
4			* The Regents of the University of California. All rights reserved.
5			*
6			* This code is derived from software contributed to Berkeley by
7			* Chris Torek.
8			*
9			* Redistribution and use in source and binary forms, with or without
10			* modification, are permitted provided that the following conditions
11			* are met:
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			* 2. Redistributions in binary form must reproduce the above copyright
15			* notice, this list of conditions and the following disclaimer in the
16			* documentation and/or other materials provided with the distribution.
17			* 3. Neither the name of the University nor the names of its contributors
18			* may be used to endorse or promote products derived from this software
19			* without specific prior written permission.
20			*
21			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31			* SUCH DAMAGE.
32			*/
33
34			#include <sys/param.h> /* ALIGN */
35			#include <unistd.h>
36			#include <stdio.h>
37			#include <errno.h>
38			#include <stdlib.h>
39			#include <string.h>
40			#include "local.h"
41			#include "glue.h"
42			#include "thread_private.h"
43
44			int __sdidinit;
45
46			#define NDYNAMIC 10 /* add ten more whenever necessary */
47
48			#define std(flags, file) \
49			{0,0,0,flags,file,{0},0,__sF+file,__sclose,__sread,__sseek,__swrite, \
50			{(unsigned char *)(__sFext+file), 0}}
51			/* p r w flags file _bf z cookie close read seek write
52			ext */
53
54			/* the usual - (stdin + stdout + stderr) */
55			static FILE usual[FOPEN_MAX - 3];
56			static struct __sfileext usualext[FOPEN_MAX - 3];
57			static struct glue uglue = { 0, FOPEN_MAX - 3, usual };
58			static struct glue *lastglue = &uglue;
59			static void *sfp_mutex;
60
61			static struct __sfileext __sFext[3];
62			FILE __sF[3] = {
63			std(__SRD, STDIN_FILENO), /* stdin */
64			std(__SWR, STDOUT_FILENO), /* stdout */
65			std(__SWR\|__SNBF, STDERR_FILENO) /* stderr */
66			};
67			struct glue __sglue = { &uglue, 3, __sF };
68
69			static struct glue *
70			moreglue(int n)
71			{
72			struct glue *g;
73			FILE *p;
74			struct __sfileext *pext;
75			static FILE empty;
76			char *data;
77
78			data = malloc(sizeof(g) + ALIGNBYTES + n sizeof(FILE)
79			+ n * sizeof(struct __sfileext));
80			if (data == NULL)
81			return (NULL);
82			g = (struct glue *)data;
83			p = (FILE )ALIGN(data + sizeof(g));
84			pext = (struct __sfileext *)
85			(ALIGN(data + sizeof(g)) + n sizeof(FILE));
86			g->next = NULL;
87			g->niobs = n;
88			g->iobs = p;
89			while (--n >= 0) {
90			*p = empty;
91			_FILEEXT_SETUP(p, pext);
92			p++;
93			pext++;
94			}
95			return (g);
96			}
97
98			/*
99			* Find a free FILE for fopen et al.
100			*/
101			FILE *
102			__sfp(void)
103			{
104			FILE *fp;
105			int n;
106			struct glue *g;
107
108	✗✓	2124	if (!__sdidinit)
109			__sinit();
110
111	✗✓	1062	_MUTEX_LOCK(&sfp_mutex);
112	✓✗	4248	for (g = &__sglue; g != NULL; g = g->next) {
113	✓✓	10620	for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
114	✓✓	4248	if (fp->_flags == 0)
115			goto found;
116			}
117
118			/* release lock while mallocing */
119			_MUTEX_UNLOCK(&sfp_mutex);
120			if ((g = moreglue(NDYNAMIC)) == NULL)
121			return (NULL);
122			_MUTEX_LOCK(&sfp_mutex);
123			lastglue->next = g;
124			lastglue = g;
125			fp = g->iobs;
126			found:
127		1062	fp->_flags = 1; /* reserve this slot; caller sets real flags */
128	✗✓	1062	_MUTEX_UNLOCK(&sfp_mutex);
129		1062	fp->_p = NULL; /* no current pointer */
130		1062	fp->_w = 0; /* nothing to read or write */
131		1062	fp->_r = 0;
132		1062	fp->_bf._base = NULL; /* no buffer */
133		1062	fp->_bf._size = 0;
134		1062	fp->_lbfsize = 0; /* not line buffered */
135		1062	fp->_file = -1; /* no file */
136			/* fp->_cookie = <any>; / / caller sets cookie, _read/_write etc */
137		1062	fp->_lb._base = NULL; /* no line buffer */
138		1062	fp->_lb._size = 0;
139		1062	_FILEEXT_INIT(fp);
140		1062	return (fp);
141		1062	}
142
143			/*
144			* exit() calls _cleanup() through the callback registered
145			* with __atexit_register_cleanup(), set whenever we open or buffer a
146			* file. This chicanery is done so that programs that do not use stdio
147			* need not link it all in.
148			*
149			* The name `_cleanup' is, alas, fairly well known outside stdio.
150			*/
151			void
152			_cleanup(void)
153			{
154			/* (void) _fwalk(fclose); */
155			(void) _fwalk(__sflush); /* `cheating' */
156			}
157
158			/*
159			* __sinit() is called whenever stdio's internal variables must be set up.
160			*/
161			void
162			__sinit(void)
163			{
164			static void *sinit_mutex;
165			int i;
166
167	✗✓	30	_MUTEX_LOCK(&sinit_mutex);
168	✓✗	15	if (__sdidinit)
169			goto out; /* bail out if caller lost the race */
170	✓✓	540	for (i = 0; i < FOPEN_MAX - 3; i++) {
171		255	_FILEEXT_SETUP(usual+i, usualext+i);
172			}
173			/* make sure we clean up on exit */
174		15	__atexit_register_cleanup(_cleanup); /* conservative */
175		15	__sdidinit = 1;
176			out:
177	✗✓	15	_MUTEX_UNLOCK(&sinit_mutex);
178		15	}