util.h revision 1.38 
1/*	$OpenBSD: util.h,v 1.38 2023/01/29 20:30:21 gnezdo Exp $	*/
2
3/*
4 * Copyright (c) 1998 Todd C. Miller <millert@openbsd.org>
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__
33
34#include <sys/utsname.h>
35#include <stdarg.h>
36#include <stddef.h>		/* for NULL */
37
38#ifndef __boot
39# if DO_CLEAN_BOOT
40#  define __boot	__attribute__((section(".boot.text")))
41#  define __boot_data	__attribute__((section(".boot.data")))
42# else
43#  define __boot
44#  define __boot_data
45# endif
46#endif
47
48__BEGIN_HIDDEN_DECLS
49void _dl_malloc_init(void) __boot;
50void *_dl_malloc(size_t size);
51void *_dl_calloc(size_t nmemb, const size_t size);
52void *_dl_realloc(void *, size_t size);
53void *_dl_reallocarray(void *, size_t nmemb, size_t size);
54void _dl_free(void *);
55void *_dl_aligned_alloc(size_t _alignment, size_t _size);
56char *_dl_strdup(const char *);
57size_t _dl_strlen(const char *);
58size_t _dl_strlcat(char *dst, const char *src, size_t siz);
59void _dl_printf(const char *fmt, ...);
60void _dl_vprintf(const char *fmt, va_list ap);
61void _dl_dprintf(int, const char *fmt, ...);
62void _dl_show_objects(void);
63void _dl_arc4randombuf(void *, size_t);
64u_int32_t _dl_arc4random(void);
65ssize_t _dl_write(int fd, const char* buf, size_t len);
66char * _dl_dirname(const char *path);
67int _dl___realpath(const char *path, char *resolved);
68int _dl_uname(struct utsname *name);
69
70long _dl_strtol(const char *nptr, char **endptr, int base);
71
72__dead void _dl_oom(void);
73__dead void _dl_die(const char *, ...) __attribute__((format (printf, 1, 2)));
74#define _dl_diedie()	_dl_thrkill(0, 9, NULL)
75__END_HIDDEN_DECLS
76
77#define	_dl_round_page(x) \
78	(((x) + ((1 << _MAX_PAGE_SHIFT) - 1)) & ~((1 << _MAX_PAGE_SHIFT) - 1))
79
80#define nitems(_a)     (sizeof((_a)) / sizeof((_a)[0]))
81
82/*
83 *	The following functions are declared inline so they can
84 *	be used before bootstrap linking has been finished.
85 */
86static inline void *
87_dl_memset(void *dst, const int c, size_t n)
88{
89	if (n != 0) {
90		char *d = dst;
91
92		do
93			*d++ = c;
94		while (--n != 0);
95	}
96	return (dst);
97}
98
99static inline void
100_dl_bcopy(const void *src, void *dest, int size)
101{
102	unsigned const char *psrc = src;
103	unsigned char *pdest = dest;
104	int i;
105
106	for (i = 0; i < size; i++)
107		pdest[i] = psrc[i];
108}
109
110static inline size_t
111_dl_strlcpy(char *dst, const char *src, size_t siz)
112{
113	char *d = dst;
114	const char *s = src;
115	size_t n = siz;
116
117	/* Copy as many bytes as will fit */
118	if (n != 0 && --n != 0) {
119		do {
120			if ((*d++ = *s++) == 0)
121				break;
122		} while (--n != 0);
123	}
124
125	/* Not enough room in dst, add NUL and traverse rest of src */
126	if (n == 0) {
127		if (siz != 0)
128			*d = '\0';		/* NUL-terminate dst */
129		while (*s++)
130			;
131	}
132
133	return(s - src - 1);	/* count does not include NUL */
134}
135
136static inline int
137_dl_strncmp(const char *s1, const char *s2, size_t n)
138{
139	if (n == 0)
140		return (0);
141	do {
142		if (*s1 != *s2++)
143			return (*(unsigned char *)s1 - *(unsigned char *)--s2);
144		if (*s1++ == 0)
145			break;
146	} while (--n != 0);
147	return (0);
148}
149
150static inline int
151_dl_strcmp(const char *s1, const char *s2)
152{
153	while (*s1 == *s2++)
154		if (*s1++ == 0)
155			return (0);
156	return (*(unsigned char *)s1 - *(unsigned char *)--s2);
157}
158
159static inline const char *
160_dl_strchr(const char *p, const int ch)
161{
162	for (;; ++p) {
163		if (*p == ch)
164			return((char *)p);
165		if (!*p)
166			return((char *)NULL);
167	}
168	/* NOTREACHED */
169}
170
171static inline char *
172_dl_strrchr(const char *str, const int ch)
173{
174	const char *p;
175	char *retval = NULL;
176
177	for (p = str; *p != '\0'; ++p)
178		if (*p == ch)
179			retval = (char *)p;
180
181	return retval;
182}
183
184static inline char *
185_dl_strstr(const char *s, const char *find)
186{
187	char c, sc;
188	size_t len;
189	if ((c = *find++) != 0) {
190		len = _dl_strlen(find);
191		do {
192			do {
193				if ((sc = *s++) == 0)
194					return (NULL);
195			} while (sc != c);
196		} while (_dl_strncmp(s, find, len) != 0);
197		s--;
198	}
199	return ((char *)s);
200}
201
202static inline int
203_dl_isalnum(int c)
204{
205	return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9');
206}
207
208#endif /*__DL_UTIL_H__*/
209