1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 #include "libuutil_common.h"
27
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32
33 void *
uu_zalloc(size_t n)34 uu_zalloc(size_t n)
35 {
36 void *p = malloc(n);
37
38 if (p == NULL) {
39 uu_set_error(UU_ERROR_SYSTEM);
40 return (NULL);
41 }
42
43 (void) memset(p, 0, n);
44
45 return (p);
46 }
47
48 void
uu_free(void * p)49 uu_free(void *p)
50 {
51 free(p);
52 }
53
54 char *
uu_strdup(const char * str)55 uu_strdup(const char *str)
56 {
57 char *buf = NULL;
58
59 if (str != NULL) {
60 size_t sz;
61
62 sz = strlen(str) + 1;
63 buf = uu_zalloc(sz);
64 if (buf != NULL)
65 (void) memcpy(buf, str, sz);
66 }
67 return (buf);
68 }
69
70 /*
71 * Duplicate up to n bytes of a string. Kind of sort of like
72 * strdup(strlcpy(s, n)).
73 */
74 char *
uu_strndup(const char * s,size_t n)75 uu_strndup(const char *s, size_t n)
76 {
77 size_t len;
78 char *p;
79
80 len = strnlen(s, n);
81 p = uu_zalloc(len + 1);
82 if (p == NULL)
83 return (NULL);
84
85 if (len > 0)
86 (void) memcpy(p, s, len);
87 p[len] = '\0';
88
89 return (p);
90 }
91
92 /*
93 * Duplicate a block of memory. Combines malloc with memcpy, much as
94 * strdup combines malloc, strlen, and strcpy.
95 */
96 void *
uu_memdup(const void * buf,size_t sz)97 uu_memdup(const void *buf, size_t sz)
98 {
99 void *p;
100
101 p = uu_zalloc(sz);
102 if (p == NULL)
103 return (NULL);
104 (void) memcpy(p, buf, sz);
105 return (p);
106 }
107
108 char *
uu_msprintf(const char * format,...)109 uu_msprintf(const char *format, ...)
110 {
111 va_list args;
112 char attic[1];
113 uint_t M, m;
114 char *b;
115
116 va_start(args, format);
117 M = vsnprintf(attic, 1, format, args);
118 va_end(args);
119
120 for (;;) {
121 m = M;
122 if ((b = uu_zalloc(m + 1)) == NULL)
123 return (NULL);
124
125 va_start(args, format);
126 M = vsnprintf(b, m + 1, format, args);
127 va_end(args);
128
129 if (M == m)
130 break; /* sizes match */
131
132 uu_free(b);
133 }
134
135 return (b);
136 }
137