util.h revision 1.27 
1/*	$OpenBSD: util.h,v 1.27 2016/08/12 20:39:01 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__
33
34#include <sys/utsname.h>
35#include <stdarg.h>
36
37void *_dl_malloc(size_t size);
38void *_dl_calloc(size_t nmemb, const size_t size);
39void *_dl_realloc(void *, size_t size);
40void *_dl_reallocarray(void *, size_t nmemb, size_t size);
41void _dl_free(void *);
42char *_dl_strdup(const char *);
43size_t _dl_strlen(const char *);
44size_t _dl_strlcat(char *dst, const char *src, size_t siz);
45void _dl_printf(const char *fmt, ...);
46void _dl_vprintf(const char *fmt, va_list ap);
47void _dl_fdprintf(int, const char *fmt, ...);
48void _dl_show_objects(void);
49void _dl_arc4randombuf(void *, size_t);
50u_int32_t _dl_arc4random(void);
51ssize_t _dl_write(int fd, const char* buf, size_t len);
52char * _dl_dirname(const char *path);
53char *_dl_realpath(const char *path, char *resolved);
54int _dl_uname(struct utsname *name);
55
56long _dl_strtol(const char *nptr, char **endptr, int base);
57
58#define	_dl_round_page(x)	(((x) + (__LDPGSZ - 1)) & ~(__LDPGSZ - 1))
59
60/*
61 *	The following functions are declared inline so they can
62 *	be used before bootstrap linking has been finished.
63 */
64static inline void
65_dl_wrstderr(const char *s)
66{
67	const char *p = s;
68	size_t n = 0;
69
70	while (*p++)
71		n++;
72	_dl_write(2, s, n);
73}
74
75static inline void *
76_dl_memset(void *dst, const int c, size_t n)
77{
78	if (n != 0) {
79		char *d = dst;
80
81		do
82			*d++ = c;
83		while (--n != 0);
84	}
85	return (dst);
86}
87
88static inline void
89_dl_bcopy(const void *src, void *dest, int size)
90{
91	unsigned const char *psrc = src;
92	unsigned char *pdest = dest;
93	int i;
94
95	for (i = 0; i < size; i++)
96		pdest[i] = psrc[i];
97}
98
99static inline size_t
100_dl_strlcpy(char *dst, const char *src, size_t siz)
101{
102	char *d = dst;
103	const char *s = src;
104	size_t n = siz;
105
106	/* Copy as many bytes as will fit */
107	if (n != 0 && --n != 0) {
108		do {
109			if ((*d++ = *s++) == 0)
110				break;
111		} while (--n != 0);
112	}
113
114	/* Not enough room in dst, add NUL and traverse rest of src */
115	if (n == 0) {
116		if (siz != 0)
117			*d = '\0';		/* NUL-terminate dst */
118		while (*s++)
119			;
120	}
121
122	return(s - src - 1);	/* count does not include NUL */
123}
124
125static inline int
126_dl_strncmp(const char *s1, const char *s2, size_t n)
127{
128	if (n == 0)
129		return (0);
130	do {
131		if (*s1 != *s2++)
132			return (*(unsigned char *)s1 - *(unsigned char *)--s2);
133		if (*s1++ == 0)
134			break;
135	} while (--n != 0);
136	return (0);
137}
138
139static inline int
140_dl_strcmp(const char *s1, const char *s2)
141{
142	while (*s1 == *s2++)
143		if (*s1++ == 0)
144			return (0);
145	return (*(unsigned char *)s1 - *(unsigned char *)--s2);
146}
147
148static inline const char *
149_dl_strchr(const char *p, const int ch)
150{
151	for (;; ++p) {
152		if (*p == ch)
153			return((char *)p);
154		if (!*p)
155			return((char *)NULL);
156	}
157	/* NOTREACHED */
158}
159
160static inline char *
161_dl_strrchr(const char *str, const int ch)
162{
163	const char *p;
164	char *retval = NULL;
165
166	for (p = str; *p != '\0'; ++p)
167		if (*p == ch)
168			retval = (char *)p;
169
170	return retval;
171}
172
173static inline char *
174_dl_strstr(const char *s, const char *find)
175{
176	char c, sc;
177	size_t len;
178	if ((c = *find++) != 0) {
179		len = _dl_strlen(find);
180		do {
181			do {
182				if ((sc = *s++) == 0)
183					return (NULL);
184			} while (sc != c);
185		} while (_dl_strncmp(s, find, len) != 0);
186		s--;
187	}
188	return ((char *)s);
189}
190
191static inline int
192_dl_isalnum(int c)
193{
194	return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9');
195}
196
197#endif /*__DL_UTIL_H__*/
198