util.h revision 1.15 
1/*	$OpenBSD: util.h,v 1.15 2003/06/11 17:47:57 deraadt Exp $	*/
2
3/*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 * Copyright (c) 1998 Per Fogelstrom, Opsycon AB
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
18 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31#ifndef __DL_UTIL_H__
32#define __DL_UTIL_H__
33void *_dl_malloc(const size_t size);
34void _dl_free(void *);
35char *_dl_strdup(const char *);
36void _dl_printf(const char *fmt, ...);
37void _dl_fdprintf(int, const char *fmt, ...);
38void _dl_show_objects(void);
39unsigned int _dl_random(void);
40
41/*
42 *	The following functions are declared inline so they can
43 *	be used before bootstrap linking has been finished.
44 */
45static inline void
46_dl_wrstderr(const char *s)
47{
48	while (*s) {
49		_dl_write(2, s, 1);
50		s++;
51	}
52}
53
54static inline void *
55_dl_memset(void *dst, const int c, size_t n)
56{
57	if (n != 0) {
58		char *d = dst;
59
60		do
61			*d++ = c;
62		while (--n != 0);
63	}
64	return (dst);
65}
66
67static inline int
68_dl_strlen(const char *str)
69{
70	const char *s;
71
72	for (s = str; *s; ++s)
73		;
74	return (s - str);
75}
76
77static inline size_t
78_dl_strlcpy(char *dst, const char *src, size_t siz)
79{
80	char *d = dst;
81	const char *s = src;
82	size_t n = siz;
83
84	/* Copy as many bytes as will fit */
85	if (n != 0 && --n != 0) {
86		do {
87			if ((*d++ = *s++) == 0)
88				break;
89		} while (--n != 0);
90	}
91
92	/* Not enough room in dst, add NUL and traverse rest of src */
93	if (n == 0) {
94		if (siz != 0)
95			*d = '\0';		/* NUL-terminate dst */
96		while (*s++)
97			;
98	}
99
100	return(s - src - 1);	/* count does not include NUL */
101}
102
103static inline int
104_dl_strncmp(const char *s1, const char *s2, size_t n)
105{
106	if (n == 0)
107		return (0);
108	do {
109		if (*s1 != *s2++)
110			return (*(unsigned char *)s1 - *(unsigned char *)--s2);
111		if (*s1++ == 0)
112			break;
113	} while (--n != 0);
114	return (0);
115}
116
117static inline int
118_dl_strcmp(const char *s1, const char *s2)
119{
120	while (*s1 == *s2++)
121		if (*s1++ == 0)
122			return (0);
123	return (*(unsigned char *)s1 - *(unsigned char *)--s2);
124}
125
126static inline const char *
127_dl_strchr(const char *p, const int ch)
128{
129	for (;; ++p) {
130		if (*p == ch)
131			return((char *)p);
132		if (!*p)
133			return((char *)NULL);
134	}
135	/* NOTREACHED */
136}
137
138#endif /*__DL_UTIL_H__*/
139