Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/stdio/fgets.c	Lines:	24	34	70.6 %
Date:	2017-11-07	Branches:	17	28	60.7 %


/*	$OpenBSD: fgets.c,v 1.16 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 <errno.h>
#include <stdio.h>
#include <string.h>
#include "local.h"

/*
 * Read at most n-1 characters from the given file.
 * Stop when a newline has been read, or the count runs out.
 * Return first argument, or NULL if no characters were read.
 * Do not return NULL if n == 1.
 */
char *
fgets(char *buf, int n, FILE *fp)
{
	size_t len;
	char *s;
	unsigned char *p, *t;

	if (n <= 0) {		/* sanity check */
		errno = EINVAL;
		return (NULL);
	}

	FLOCKFILE(fp);
	_SET_ORIENTATION(fp, -1);
	s = buf;
	n--;			/* leave space for NUL */
	while (n != 0) {
		/*
		 * If the buffer is empty, refill it.
		 */
		if (fp->_r <= 0) {
			if (__srefill(fp)) {
				/* EOF/error: stop with partial or no line */
				if (s == buf) {
					FUNLOCKFILE(fp);
					return (NULL);
				}
				break;
			}
		}
		len = fp->_r;
		p = fp->_p;

		/*
		 * Scan through at most n bytes of the current buffer,
		 * looking for '\n'.  If found, copy up to and including
		 * newline, and stop.  Otherwise, copy entire chunk
		 * and loop.
		 */
		if (len > n)
			len = n;
		t = memchr(p, '\n', len);
		if (t != NULL) {
			len = ++t - p;
			fp->_r -= len;
			fp->_p = t;
			(void)memcpy(s, p, len);
			s[len] = '\0';
			FUNLOCKFILE(fp);
			return (buf);
		}
		fp->_r -= len;
		fp->_p += len;
		(void)memcpy(s, p, len);
		s += len;
		n -= len;
	}
	*s = '\0';
	FUNLOCKFILE(fp);
	return (buf);
}
DEF_STRONG(fgets);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: fgets.c,v 1.16 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 <errno.h>
35			#include <stdio.h>
36			#include <string.h>
37			#include "local.h"
38
39			/*
40			* Read at most n-1 characters from the given file.
41			* Stop when a newline has been read, or the count runs out.
42			* Return first argument, or NULL if no characters were read.
43			* Do not return NULL if n == 1.
44			*/
45			char *
46			fgets(char buf, int n, FILE fp)
47			{
48			size_t len;
49			char *s;
50			unsigned char p, t;
51
52	✗✓	41242	if (n <= 0) { /* sanity check */
53			errno = EINVAL;
54			return (NULL);
55			}
56
57	✗✓	20621	FLOCKFILE(fp);
58	✓✗✓✗ ✓✓	83654	_SET_ORIENTATION(fp, -1);
59			s = buf;
60		20621	n--; /* leave space for NUL */
61	✓✗	41242	while (n != 0) {
62			/*
63			* If the buffer is empty, refill it.
64			*/
65	✓✓	20621	if (fp->_r <= 0) {
66	✓✓	1510	if (__srefill(fp)) {
67			/* EOF/error: stop with partial or no line */
68	✓✗	350	if (s == buf) {
69	✗✓	350	FUNLOCKFILE(fp);
70		350	return (NULL);
71			}
72			break;
73			}
74			}
75		20271	len = fp->_r;
76		20271	p = fp->_p;
77
78			/*
79			* Scan through at most n bytes of the current buffer,
80			* looking for '\n'. If found, copy up to and including
81			* newline, and stop. Otherwise, copy entire chunk
82			* and loop.
83			*/
84	✓✓	20271	if (len > n)
85		7101	len = n;
86		20271	t = memchr(p, '\n', len);
87	✓✗	20271	if (t != NULL) {
88		20271	len = ++t - p;
89		20271	fp->_r -= len;
90		20271	fp->_p = t;
91		20271	(void)memcpy(s, p, len);
92		20271	s[len] = '\0';
93	✗✓	20271	FUNLOCKFILE(fp);
94		20271	return (buf);
95			}
96			fp->_r -= len;
97			fp->_p += len;
98			(void)memcpy(s, p, len);
99			s += len;
100			n -= len;
101			}
102			*s = '\0';
103			FUNLOCKFILE(fp);
104			return (buf);
105		20621	}
106			DEF_STRONG(fgets);