1 /* $NetBSD: strl_obsd.c,v 1.5 2020/05/25 20:47:24 christos Exp $ */
2
3 /*
4 * Why use strlcpy()/strlcat() instead of standard strncpy()/strncat()?
5 * To reduce likelihood of bugs and avoid wasteful zero fills. See:
6 * http://www.gratisoft.us/todd/papers/strlcpy.html
7 */
8
9 /* $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $ */
10
11 /*
12 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
13 *
14 * Permission to use, copy, modify, and distribute this software for any
15 * purpose with or without fee is hereby granted, provided that the above
16 * copyright notice and this permission notice appear in all copies.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
19 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
21 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
22 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
23 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
24 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
25 */
26
27 #include <config.h> /* + marks local changes */
28 #ifdef HAVE_SYS_TYPES_H /* + */
29 #include <sys/types.h>
30 #endif /* + */
31 #include <string.h>
32
33 #include "ntp_stdlib.h" /* + strlcpy, strlcat prototypes */
34
35 #ifndef HAVE_STRLCPY /* + */
36 /*
37 * Copy src to string dst of size siz. At most siz-1 characters
38 * will be copied. Always NUL terminates (unless siz == 0).
39 * Returns strlen(src); if retval >= siz, truncation occurred.
40 */
41 size_t
strlcpy(char * dst,const char * src,size_t siz)42 strlcpy(char *dst, const char *src, size_t siz)
43 {
44 char *d = dst;
45 const char *s = src;
46 size_t n = siz;
47
48 /* Copy as many bytes as will fit */
49 if (n != 0) {
50 while (--n != 0) {
51 if ((*d++ = *s++) == '\0')
52 break;
53 }
54 }
55
56 /* Not enough room in dst, add NUL and traverse rest of src */
57 if (n == 0) {
58 if (siz != 0)
59 *d = '\0'; /* NUL-terminate dst */
60 while (*s++)
61 ;
62 }
63
64 return(s - src - 1); /* count does not include NUL */
65 }
66 #endif /* + */
67
68
69 /* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
70
71 /*
72 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
73 *
74 * Permission to use, copy, modify, and distribute this software for any
75 * purpose with or without fee is hereby granted, provided that the above
76 * copyright notice and this permission notice appear in all copies.
77 *
78 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
79 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
80 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
81 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
82 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
83 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
84 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
85 */
86
87 /* #include <sys/types.h> */ /* + */
88 /* #include <string.h> */ /* + */
89
90 #ifndef HAVE_STRLCAT /* + */
91 /*
92 * Appends src to string dst of size siz (unlike strncat, siz is the
93 * full size of dst, not space left). At most siz-1 characters
94 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
95 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
96 * If retval >= siz, truncation occurred.
97 */
98 size_t
strlcat(char * dst,const char * src,size_t siz)99 strlcat(char *dst, const char *src, size_t siz)
100 {
101 char *d = dst;
102 const char *s = src;
103 size_t n = siz;
104 size_t dlen;
105
106 /* Find the end of dst and adjust bytes left but don't go past end */
107 while (n-- != 0 && *d != '\0')
108 d++;
109 dlen = d - dst;
110 n = siz - dlen;
111
112 if (n == 0)
113 return(dlen + strlen(s));
114 while (*s != '\0') {
115 if (n != 1) {
116 *d++ = *s;
117 n--;
118 }
119 s++;
120 }
121 *d = '\0';
122
123 return(dlen + (s - src)); /* count does not include NUL */
124 }
125 #endif /* + */
126