Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/stdio/refill.c	Lines:	22	43	51.2 %
Date:	2017-11-07	Branches:	15	30	50.0 %


/*	$OpenBSD: refill.c,v 1.11 2009/11/09 00:18:27 kurt 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "local.h"

static int
lflush(FILE *fp)
{
	if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
		return (__sflush_locked(fp));	/* ignored... */
	return (0);
}

/*
 * Refill a stdio buffer.
 * Return EOF on eof or error, 0 otherwise.
 */
int
__srefill(FILE *fp)
{

	/* make sure stdio is set up */
	if (!__sdidinit)
		__sinit();

	fp->_r = 0;		/* largely a convenience for callers */

	/* SysV does not make this test; take it out for compatibility */
	if (fp->_flags & __SEOF)
		return (EOF);

	/* if not already reading, have to be reading and writing */
	if ((fp->_flags & __SRD) == 0) {
		if ((fp->_flags & __SRW) == 0) {
			errno = EBADF;
			fp->_flags |= __SERR;
			return (EOF);
		}
		/* switch to reading */
		if (fp->_flags & __SWR) {
			if (__sflush(fp))
				return (EOF);
			fp->_flags &= ~__SWR;
			fp->_w = 0;
			fp->_lbfsize = 0;
		}
		fp->_flags |= __SRD;
	} else {
		/*
		 * We were reading.  If there is an ungetc buffer,
		 * we must have been reading from that.  Drop it,
		 * restoring the previous buffer (if any).  If there
		 * is anything in that buffer, return.
		 */
		if (HASUB(fp)) {
			FREEUB(fp);
			if ((fp->_r = fp->_ur) != 0) {
				fp->_p = fp->_up;
				return (0);
			}
		}
	}

	if (fp->_bf._base == NULL)
		__smakebuf(fp);

	/*
	 * Before reading from a line buffered or unbuffered file,
	 * flush all line buffered output files, per the ANSI C
	 * standard.
	 */
	if (fp->_flags & (__SLBF|__SNBF)) {
		/* Ignore this file in _fwalk to avoid potential deadlock. */
		fp->_flags |= __SIGN;
		(void) _fwalk(lflush);
		fp->_flags &= ~__SIGN;

		/* Now flush this file without locking it. */
		if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
			__sflush(fp);
	}
	fp->_p = fp->_bf._base;
	fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);
	fp->_flags &= ~__SMOD;	/* buffer contents are again pristine */
	if (fp->_r <= 0) {
		if (fp->_r == 0)
			fp->_flags |= __SEOF;
		else {
			fp->_r = 0;
			fp->_flags |= __SERR;
		}
		return (EOF);
	}
	return (0);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: refill.c,v 1.11 2009/11/09 00:18:27 kurt 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 <errno.h>
35			#include <stdio.h>
36			#include <stdlib.h>
37			#include "local.h"
38
39			static int
40			lflush(FILE *fp)
41			{
42			if ((fp->_flags & (__SLBF\|__SWR)) == (__SLBF\|__SWR))
43			return (__sflush_locked(fp)); /* ignored... */
44			return (0);
45			}
46
47			/*
48			* Refill a stdio buffer.
49			* Return EOF on eof or error, 0 otherwise.
50			*/
51			int
52			__srefill(FILE *fp)
53			{
54
55			/* make sure stdio is set up */
56	✓✓	326272	if (!__sdidinit)
57		20	__sinit();
58
59		163136	fp->_r = 0; /* largely a convenience for callers */
60
61			/* SysV does not make this test; take it out for compatibility */
62	✓✓	163136	if (fp->_flags & __SEOF)
63		290	return (EOF);
64
65			/* if not already reading, have to be reading and writing */
66	✓✓	162846	if ((fp->_flags & __SRD) == 0) {
67	✗✓	260	if ((fp->_flags & __SRW) == 0) {
68			errno = EBADF;
69			fp->_flags \|= __SERR;
70			return (EOF);
71			}
72			/* switch to reading */
73	✗✓	260	if (fp->_flags & __SWR) {
74			if (__sflush(fp))
75			return (EOF);
76			fp->_flags &= ~__SWR;
77			fp->_w = 0;
78			fp->_lbfsize = 0;
79			}
80		260	fp->_flags \|= __SRD;
81		260	} else {
82			/*
83			* We were reading. If there is an ungetc buffer,
84			* we must have been reading from that. Drop it,
85			* restoring the previous buffer (if any). If there
86			* is anything in that buffer, return.
87			*/
88	✗✓	162586	if (HASUB(fp)) {
89			FREEUB(fp);
90			if ((fp->_r = fp->_ur) != 0) {
91			fp->_p = fp->_up;
92			return (0);
93			}
94			}
95			}
96
97	✓✓	162846	if (fp->_bf._base == NULL)
98		1576	__smakebuf(fp);
99
100			/*
101			* Before reading from a line buffered or unbuffered file,
102			* flush all line buffered output files, per the ANSI C
103			* standard.
104			*/
105	✗✓	162846	if (fp->_flags & (__SLBF\|__SNBF)) {
106			/* Ignore this file in _fwalk to avoid potential deadlock. */
107			fp->_flags \|= __SIGN;
108			(void) _fwalk(lflush);
109			fp->_flags &= ~__SIGN;
110
111			/* Now flush this file without locking it. */
112			if ((fp->_flags & (__SLBF\|__SWR)) == (__SLBF\|__SWR))
113			__sflush(fp);
114			}
115		162846	fp->_p = fp->_bf._base;
116		162846	fp->_r = (fp->_read)(fp->_cookie, (char )fp->_p, fp->_bf._size);
117		162846	fp->_flags &= ~__SMOD; /* buffer contents are again pristine */
118	✓✓	162846	if (fp->_r <= 0) {
119	✗✓	846	if (fp->_r == 0)
120			fp->_flags \|= __SEOF;
121			else {
122			fp->_r = 0;
123			fp->_flags \|= __SERR;
124			}
125		846	return (EOF);
126			}
127		162000	return (0);
128		163136	}