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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/stdio/makebuf.c	Lines:	23	32	71.9 %
Date:	2017-11-07	Branches:	12	16	75.0 %


/*	$OpenBSD: makebuf.c,v 1.9 2015/01/13 07:18:21 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/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include "local.h"

/*
 * Allocate a file buffer, or switch to unbuffered I/O.
 * Per the ANSI C standard, ALL tty devices default to line buffered.
 *
 * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
 * optimisation) right after the fstat() that finds the buffer size.
 */
void
__smakebuf(FILE *fp)
{
	void *p;
	int flags;
	size_t size;
	int couldbetty;

	if (fp->_flags & __SNBF) {
		fp->_bf._base = fp->_p = fp->_nbuf;
		fp->_bf._size = 1;
		return;
	}
	flags = __swhatbuf(fp, &size, &couldbetty);
	if ((p = malloc(size)) == NULL) {
		fp->_flags |= __SNBF;
		fp->_bf._base = fp->_p = fp->_nbuf;
		fp->_bf._size = 1;
		return;
	}
	flags |= __SMBF;
	fp->_bf._base = fp->_p = p;
	fp->_bf._size = size;
	if (couldbetty && isatty(fp->_file))
		flags |= __SLBF;
	fp->_flags |= flags;
}

/*
 * Internal routine to determine `proper' buffering for a file.
 */
int
__swhatbuf(FILE *fp, size_t *bufsize, int *couldbetty)
{
	struct stat st;

	if (fp->_file < 0 || fstat(fp->_file, &st) < 0) {
		*couldbetty = 0;
		*bufsize = BUFSIZ;
		return (__SNPT);
	}

	/* could be a tty iff it is a character device */
	*couldbetty = S_ISCHR(st.st_mode);
	if (st.st_blksize == 0) {
		*bufsize = BUFSIZ;
		return (__SNPT);
	}

	/*
	 * Optimise fseek() only if it is a regular file.  (The test for
	 * __sseek is mainly paranoia.)  It is safe to set _blksize
	 * unconditionally; it will only be used if __SOPT is also set.
	 */
	*bufsize = st.st_blksize;
	fp->_blksize = st.st_blksize;
	return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ?
	    __SOPT : __SNPT);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: makebuf.c,v 1.9 2015/01/13 07:18:21 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/types.h>
35			#include <sys/stat.h>
36			#include <unistd.h>
37			#include <stdio.h>
38			#include <stdlib.h>
39			#include "local.h"
40
41			/*
42			* Allocate a file buffer, or switch to unbuffered I/O.
43			* Per the ANSI C standard, ALL tty devices default to line buffered.
44			*
45			* As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
46			* optimisation) right after the fstat() that finds the buffer size.
47			*/
48			void
49			__smakebuf(FILE *fp)
50			{
51			void *p;
52			int flags;
53		11771052	size_t size;
54		5885526	int couldbetty;
55
56	✓✓	5885526	if (fp->_flags & __SNBF) {
57		153	fp->_bf._base = fp->_p = fp->_nbuf;
58		153	fp->_bf._size = 1;
59		153	return;
60			}
61		5885373	flags = __swhatbuf(fp, &size, &couldbetty);
62	✗✓	5885373	if ((p = malloc(size)) == NULL) {
63			fp->_flags \|= __SNBF;
64			fp->_bf._base = fp->_p = fp->_nbuf;
65			fp->_bf._size = 1;
66			return;
67			}
68		5885373	flags \|= __SMBF;
69		5885373	fp->_bf._base = fp->_p = p;
70		5885373	fp->_bf._size = size;
71	✓✓✓✓	5886826	if (couldbetty && isatty(fp->_file))
72		1393	flags \|= __SLBF;
73		5885373	fp->_flags \|= flags;
74		11770899	}
75
76			/*
77			* Internal routine to determine `proper' buffering for a file.
78			*/
79			int
80			__swhatbuf(FILE fp, size_t bufsize, int *couldbetty)
81			{
82		11770746	struct stat st;
83
84	✓✗✗✓	11770746	if (fp->_file < 0 \|\| fstat(fp->_file, &st) < 0) {
85			*couldbetty = 0;
86			*bufsize = BUFSIZ;
87			return (__SNPT);
88			}
89
90			/* could be a tty iff it is a character device */
91		5885373	*couldbetty = S_ISCHR(st.st_mode);
92	✗✓	5885373	if (st.st_blksize == 0) {
93			*bufsize = BUFSIZ;
94			return (__SNPT);
95			}
96
97			/*
98			* Optimise fseek() only if it is a regular file. (The test for
99			* __sseek is mainly paranoia.) It is safe to set _blksize
100			* unconditionally; it will only be used if __SOPT is also set.
101			*/
102		5885373	*bufsize = st.st_blksize;
103		5885373	fp->_blksize = st.st_blksize;
104	✓✓	17649128	return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ?
105			__SOPT : __SNPT);
106		5885373	}