GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/stdio/getdelim.c Lines: 12 48 25.0 %
Date: 2017-11-07 Branches: 11 42 26.2 %

Line Branch Exec Source
1
/*	$OpenBSD: getdelim.c,v 1.6 2017/04/13 18:36:51 brynet Exp $	*/
2
/* $NetBSD: getdelim.c,v 1.13 2011/07/22 23:12:30 joerg Exp $ */
3
4
/*
5
 * Copyright (c) 2009 The NetBSD Foundation, Inc.
6
 *
7
 * This code is derived from software contributed to The NetBSD Foundation
8
 * by Roy Marples.
9
 *
10
 * Redistribution and use in source and binary forms, with or without
11
 * modification, are permitted provided that the following conditions
12
 * are met:
13
 * 1. Redistributions of source code must retain the above copyright
14
 *    notice, this list of conditions and the following disclaimer.
15
 * 2. Redistributions in binary form must reproduce the above copyright
16
 *    notice, this list of conditions and the following disclaimer in the
17
 *    documentation and/or other materials provided with the distribution.
18
 *
19
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
 */
30
31
#include <errno.h>
32
#include <limits.h>
33
#include <stdint.h>
34
#include <stdio.h>
35
#include <stdlib.h>
36
#include <string.h>
37
38
#include "local.h"
39
40
/* Minimum buffer size we create.
41
 * This should allow config files to fit into our power of 2 buffer growth
42
 * without the need for a realloc. */
43
#define MINBUF	128
44
45
ssize_t
46
getdelim(char **__restrict buf, size_t *__restrict buflen,
47
    int sep, FILE *__restrict fp)
48
{
49
	unsigned char *p;
50
	size_t len, newlen, off;
51
	char *newb;
52
53
20
	FLOCKFILE(fp);
54
55
10
	if (buf == NULL || buflen == NULL) {
56
		errno = EINVAL;
57
		goto error;
58
	}
59
60
	/* If buf is NULL, we have to assume a size of zero */
61
10
	if (*buf == NULL)
62
10
		*buflen = 0;
63
64

50
	_SET_ORIENTATION(fp, -1);
65
	off = 0;
66
10
	do {
67
		/* If the input buffer is empty, refill it */
68

20
		if (fp->_r <= 0 && __srefill(fp)) {
69
10
			if (__sferror(fp))
70
				goto error;
71
			/* No error, so EOF. */
72
			break;
73
		}
74
75
		/* Scan through looking for the separator */
76
		p = memchr(fp->_p, sep, fp->_r);
77
		if (p == NULL)
78
			len = fp->_r;
79
		else
80
			len = (p - fp->_p) + 1;
81
82
		/* Ensure we can handle it */
83
		if (off > SSIZE_MAX || len + 1 > SSIZE_MAX - off) {
84
			errno = EOVERFLOW;
85
			goto error;
86
		}
87
		newlen = off + len + 1; /* reserve space for NUL terminator */
88
		if (newlen > *buflen) {
89
			if (newlen < MINBUF)
90
				newlen = MINBUF;
91
#define powerof2(x) ((((x)-1)&(x))==0)
92
			if (!powerof2(newlen)) {
93
				/* Grow the buffer to the next power of 2 */
94
				newlen--;
95
				newlen |= newlen >> 1;
96
				newlen |= newlen >> 2;
97
				newlen |= newlen >> 4;
98
				newlen |= newlen >> 8;
99
				newlen |= newlen >> 16;
100
#if SIZE_MAX > 0xffffffffU
101
				newlen |= newlen >> 32;
102
#endif
103
				newlen++;
104
			}
105
106
			newb = recallocarray(*buf, *buflen, newlen, 1);
107
			if (newb == NULL)
108
				goto error;
109
			*buf = newb;
110
			*buflen = newlen;
111
		}
112
113
		(void)memcpy((*buf + off), fp->_p, len);
114
		/* Safe, len is never greater than what fp->_r can fit. */
115
		fp->_r -= (int)len;
116
		fp->_p += (int)len;
117
		off += len;
118
	} while (p == NULL);
119
120
10
	FUNLOCKFILE(fp);
121
122
	/* POSIX demands we return -1 on EOF. */
123
10
	if (off == 0)
124
10
		return -1;
125
126
	if (*buf != NULL)
127
		*(*buf + off) = '\0';
128
	return off;
129
130
error:
131
	fp->_flags |= __SERR;
132
	FUNLOCKFILE(fp);
133
	return -1;
134
10
}
135
DEF_WEAK(getdelim);