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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/stdio/ungetc.c	Lines:	0	56	0.0 %
Date:	2017-11-13	Branches:	0	46	0.0 %


/*	$OpenBSD: ungetc.c,v 1.15 2016/09/21 04:38:56 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "local.h"

static int __submore(FILE *);
/*
 * Expand the ungetc buffer `in place'.  That is, adjust fp->_p when
 * the buffer moves, so that it points the same distance from the end,
 * and move the bytes in the buffer around as necessary so that they
 * are all at the end (stack-style).
 */
static int
__submore(FILE *fp)
{
	int i;
	unsigned char *p;

	if (_UB(fp)._base == fp->_ubuf) {
		/*
		 * Get a new buffer (rather than expanding the old one).
		 */
		if ((p = malloc(BUFSIZ)) == NULL)
			return (EOF);
		_UB(fp)._base = p;
		_UB(fp)._size = BUFSIZ;
		p += BUFSIZ - sizeof(fp->_ubuf);
		for (i = sizeof(fp->_ubuf); --i >= 0;)
			p[i] = fp->_ubuf[i];
		fp->_p = p;
		return (0);
	}
	i = _UB(fp)._size;
	p = reallocarray(_UB(fp)._base, i, 2);
	if (p == NULL)
		return (EOF);
	/* no overlap (hence can use memcpy) because we doubled the size */
	(void)memcpy(p + i, p, i);
	fp->_p = p + i;
	_UB(fp)._base = p;
	_UB(fp)._size = i * 2;
	return (0);
}

int
ungetc(int c, FILE *fp)
{
	if (c == EOF)
		return (EOF);
	if (!__sdidinit)
		__sinit();
	FLOCKFILE(fp);
	_SET_ORIENTATION(fp, -1);
	if ((fp->_flags & __SRD) == 0) {
		/*
		 * Not already reading: no good unless reading-and-writing.
		 * Otherwise, flush any current write stuff.
		 */
		if ((fp->_flags & __SRW) == 0) {
error:			FUNLOCKFILE(fp);
			return (EOF);
		}
		if (fp->_flags & __SWR) {
			if (__sflush(fp))
				goto error;
			fp->_flags &= ~__SWR;
			fp->_w = 0;
			fp->_lbfsize = 0;
		}
		fp->_flags |= __SRD;
	}
	c = (unsigned char)c;

	/*
	 * If we are in the middle of ungetc'ing, just continue.
	 * This may require expanding the current ungetc buffer.
	 */
	if (HASUB(fp)) {
		if (fp->_r >= _UB(fp)._size && __submore(fp))
			goto error;
		*--fp->_p = c;
inc_ret:	fp->_r++;
		FUNLOCKFILE(fp);
		return (c);
	}
	fp->_flags &= ~__SEOF;

	/*
	 * If we can handle this by simply backing up, do so,
	 * but never replace the original character.
	 * (This makes sscanf() work when scanning `const' data.)
	 */
	if (fp->_bf._base != NULL && fp->_p > fp->_bf._base &&
	    fp->_p[-1] == c) {
		fp->_p--;
		goto inc_ret;
	}

	/*
	 * Create an ungetc buffer.
	 * Initially, we will use the `reserve' buffer.
	 */
	fp->_ur = fp->_r;
	fp->_up = fp->_p;
	_UB(fp)._base = fp->_ubuf;
	_UB(fp)._size = sizeof(fp->_ubuf);
	fp->_ubuf[sizeof(fp->_ubuf) - 1] = c;
	fp->_p = &fp->_ubuf[sizeof(fp->_ubuf) - 1];
	fp->_r = 1;
	FUNLOCKFILE(fp);
	return (c);
}
DEF_STRONG(ungetc);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ungetc.c,v 1.15 2016/09/21 04:38:56 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 <stdio.h>
35			#include <stdlib.h>
36			#include <string.h>
37			#include "local.h"
38
39			static int __submore(FILE *);
40			/*
41			* Expand the ungetc buffer `in place'. That is, adjust fp->_p when
42			* the buffer moves, so that it points the same distance from the end,
43			* and move the bytes in the buffer around as necessary so that they
44			* are all at the end (stack-style).
45			*/
46			static int
47			__submore(FILE *fp)
48			{
49			int i;
50			unsigned char *p;
51
52			if (_UB(fp)._base == fp->_ubuf) {
53			/*
54			* Get a new buffer (rather than expanding the old one).
55			*/
56			if ((p = malloc(BUFSIZ)) == NULL)
57			return (EOF);
58			_UB(fp)._base = p;
59			_UB(fp)._size = BUFSIZ;
60			p += BUFSIZ - sizeof(fp->_ubuf);
61			for (i = sizeof(fp->_ubuf); --i >= 0;)
62			p[i] = fp->_ubuf[i];
63			fp->_p = p;
64			return (0);
65			}
66			i = _UB(fp)._size;
67			p = reallocarray(_UB(fp)._base, i, 2);
68			if (p == NULL)
69			return (EOF);
70			/* no overlap (hence can use memcpy) because we doubled the size */
71			(void)memcpy(p + i, p, i);
72			fp->_p = p + i;
73			_UB(fp)._base = p;
74			_UB(fp)._size = i * 2;
75			return (0);
76			}
77
78			int
79			ungetc(int c, FILE *fp)
80			{
81			if (c == EOF)
82			return (EOF);
83			if (!__sdidinit)
84			__sinit();
85			FLOCKFILE(fp);
86			_SET_ORIENTATION(fp, -1);
87			if ((fp->_flags & __SRD) == 0) {
88			/*
89			* Not already reading: no good unless reading-and-writing.
90			* Otherwise, flush any current write stuff.
91			*/
92			if ((fp->_flags & __SRW) == 0) {
93			error: FUNLOCKFILE(fp);
94			return (EOF);
95			}
96			if (fp->_flags & __SWR) {
97			if (__sflush(fp))
98			goto error;
99			fp->_flags &= ~__SWR;
100			fp->_w = 0;
101			fp->_lbfsize = 0;
102			}
103			fp->_flags \|= __SRD;
104			}
105			c = (unsigned char)c;
106
107			/*
108			* If we are in the middle of ungetc'ing, just continue.
109			* This may require expanding the current ungetc buffer.
110			*/
111			if (HASUB(fp)) {
112			if (fp->_r >= _UB(fp)._size && __submore(fp))
113			goto error;
114			*--fp->_p = c;
115			inc_ret: fp->_r++;
116			FUNLOCKFILE(fp);
117			return (c);
118			}
119			fp->_flags &= ~__SEOF;
120
121			/*
122			* If we can handle this by simply backing up, do so,
123			* but never replace the original character.
124			* (This makes sscanf() work when scanning `const' data.)
125			*/
126			if (fp->_bf._base != NULL && fp->_p > fp->_bf._base &&
127			fp->_p[-1] == c) {
128			fp->_p--;
129			goto inc_ret;
130			}
131
132			/*
133			* Create an ungetc buffer.
134			* Initially, we will use the `reserve' buffer.
135			*/
136			fp->_ur = fp->_r;
137			fp->_up = fp->_p;
138			_UB(fp)._base = fp->_ubuf;
139			_UB(fp)._size = sizeof(fp->_ubuf);
140			fp->_ubuf[sizeof(fp->_ubuf) - 1] = c;
141			fp->_p = &fp->_ubuf[sizeof(fp->_ubuf) - 1];
142			fp->_r = 1;
143			FUNLOCKFILE(fp);
144			return (c);
145			}
146			DEF_STRONG(ungetc);