Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/stdio/fgetln.c	Lines:	0	45	0.0 %
Date:	2017-11-13	Branches:	0	38	0.0 %


/*	$OpenBSD: fgetln.c,v 1.17 2017/03/17 14:53:08 deraadt 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"

/*
 * Expand the line buffer.  Return -1 on error.
 */
static int
__slbexpand(FILE *fp, size_t newsize)
{
	void *p;

	if (fp->_lb._size >= newsize)
		return (0);
	if ((p = recallocarray(fp->_lb._base, fp->_lb._size, newsize, 1)) == NULL)
		return (-1);
	fp->_lb._base = p;
	fp->_lb._size = newsize;
	return (0);
}

/*
 * Get an input line.  The returned pointer often (but not always)
 * points into a stdio buffer.  Fgetline does not alter the text of
 * the returned line (which is thus not a C string because it will
 * not necessarily end with '\0'), but does allow callers to modify
 * it if they wish.  Thus, we set __SMOD in case the caller does.
 */
char *
fgetln(FILE *fp, size_t *lenp)
{
	unsigned char *p;
	char *ret;
	size_t len;
	size_t off;

	FLOCKFILE(fp);
	_SET_ORIENTATION(fp, -1);

	/* make sure there is input */
	if (fp->_r <= 0 && __srefill(fp))
		goto error;

	/* look for a newline in the input */
	if ((p = memchr(fp->_p, '\n', fp->_r)) != NULL) {
		/*
		 * Found one.  Flag buffer as modified to keep fseek from
		 * `optimising' a backward seek, in case the user stomps on
		 * the text.
		 */
		p++;		/* advance over it */
		ret = (char *)fp->_p;
		*lenp = len = p - fp->_p;
		fp->_flags |= __SMOD;
		fp->_r -= len;
		fp->_p = p;
		FUNLOCKFILE(fp);
		return (ret);
	}

	/*
	 * We have to copy the current buffered data to the line buffer.
	 * As a bonus, though, we can leave off the __SMOD.
	 *
	 * OPTIMISTIC is length that we (optimistically) expect will
	 * accommodate the `rest' of the string, on each trip through the
	 * loop below.
	 */
#define OPTIMISTIC 80

	for (len = fp->_r, off = 0;; len += fp->_r) {
		size_t diff;

		/*
		 * Make sure there is room for more bytes.  Copy data from
		 * file buffer to line buffer, refill file and look for
		 * newline.  The loop stops only when we find a newline.
		 */
		if (__slbexpand(fp, len + OPTIMISTIC))
			goto error;
		(void)memcpy(fp->_lb._base + off, fp->_p, len - off);
		off = len;
		if (__srefill(fp)) {
			if (fp->_flags & __SEOF)
				break;
			goto error;
		}
		if ((p = memchr(fp->_p, '\n', fp->_r)) == NULL)
			continue;

		/* got it: finish up the line (like code above) */
		p++;
		diff = p - fp->_p;
		len += diff;
		if (__slbexpand(fp, len))
			goto error;
		(void)memcpy(fp->_lb._base + off, fp->_p, diff);
		fp->_r -= diff;
		fp->_p = p;
		break;
	}
	*lenp = len;
	ret = (char *)fp->_lb._base;
	FUNLOCKFILE(fp);
	return (ret);

error:
	FUNLOCKFILE(fp);
	*lenp = 0;
	return (NULL);
}
DEF_WEAK(fgetln);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: fgetln.c,v 1.17 2017/03/17 14:53:08 deraadt 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			/*
40			* Expand the line buffer. Return -1 on error.
41			*/
42			static int
43			__slbexpand(FILE *fp, size_t newsize)
44			{
45			void *p;
46
47			if (fp->_lb._size >= newsize)
48			return (0);
49			if ((p = recallocarray(fp->_lb._base, fp->_lb._size, newsize, 1)) == NULL)
50			return (-1);
51			fp->_lb._base = p;
52			fp->_lb._size = newsize;
53			return (0);
54			}
55
56			/*
57			* Get an input line. The returned pointer often (but not always)
58			* points into a stdio buffer. Fgetline does not alter the text of
59			* the returned line (which is thus not a C string because it will
60			* not necessarily end with '\0'), but does allow callers to modify
61			* it if they wish. Thus, we set __SMOD in case the caller does.
62			*/
63			char *
64			fgetln(FILE fp, size_t lenp)
65			{
66			unsigned char *p;
67			char *ret;
68			size_t len;
69			size_t off;
70
71			FLOCKFILE(fp);
72			_SET_ORIENTATION(fp, -1);
73
74			/* make sure there is input */
75			if (fp->_r <= 0 && __srefill(fp))
76			goto error;
77
78			/* look for a newline in the input */
79			if ((p = memchr(fp->_p, '\n', fp->_r)) != NULL) {
80			/*
81			* Found one. Flag buffer as modified to keep fseek from
82			* `optimising' a backward seek, in case the user stomps on
83			* the text.
84			*/
85			p++; /* advance over it */
86			ret = (char *)fp->_p;
87			*lenp = len = p - fp->_p;
88			fp->_flags \|= __SMOD;
89			fp->_r -= len;
90			fp->_p = p;
91			FUNLOCKFILE(fp);
92			return (ret);
93			}
94
95			/*
96			* We have to copy the current buffered data to the line buffer.
97			* As a bonus, though, we can leave off the __SMOD.
98			*
99			* OPTIMISTIC is length that we (optimistically) expect will
100			* accommodate the `rest' of the string, on each trip through the
101			* loop below.
102			*/
103			#define OPTIMISTIC 80
104
105			for (len = fp->_r, off = 0;; len += fp->_r) {
106			size_t diff;
107
108			/*
109			* Make sure there is room for more bytes. Copy data from
110			* file buffer to line buffer, refill file and look for
111			* newline. The loop stops only when we find a newline.
112			*/
113			if (__slbexpand(fp, len + OPTIMISTIC))
114			goto error;
115			(void)memcpy(fp->_lb._base + off, fp->_p, len - off);
116			off = len;
117			if (__srefill(fp)) {
118			if (fp->_flags & __SEOF)
119			break;
120			goto error;
121			}
122			if ((p = memchr(fp->_p, '\n', fp->_r)) == NULL)
123			continue;
124
125			/* got it: finish up the line (like code above) */
126			p++;
127			diff = p - fp->_p;
128			len += diff;
129			if (__slbexpand(fp, len))
130			goto error;
131			(void)memcpy(fp->_lb._base + off, fp->_p, diff);
132			fp->_r -= diff;
133			fp->_p = p;
134			break;
135			}
136			*lenp = len;
137			ret = (char *)fp->_lb._base;
138			FUNLOCKFILE(fp);
139			return (ret);
140
141			error:
142			FUNLOCKFILE(fp);
143			*lenp = 0;
144			return (NULL);
145			}
146			DEF_WEAK(fgetln);