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[thirdparty/openssl.git] / crypto / buffer / buf_str.c
1 /* crypto/buffer/buffer.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include <limits.h>
61 #include "internal/cryptlib.h"
62 #include <openssl/buffer.h>
63
64 size_t BUF_strnlen(const char *str, size_t maxlen)
65 {
66 const char *p;
67
68 for (p = str; maxlen-- != 0 && *p != '\0'; ++p) ;
69
70 return p - str;
71 }
72
73 char *BUF_strdup(const char *str)
74 {
75 if (str == NULL)
76 return NULL;
77 return BUF_strndup(str, strlen(str));
78 }
79
80 char *BUF_strndup(const char *str, size_t siz)
81 {
82 char *ret;
83
84 if (str == NULL)
85 return NULL;
86
87 siz = BUF_strnlen(str, siz);
88
89 if (siz >= INT_MAX)
90 return NULL;
91
92 ret = OPENSSL_malloc(siz + 1);
93 if (ret == NULL) {
94 BUFerr(BUF_F_BUF_STRNDUP, ERR_R_MALLOC_FAILURE);
95 return NULL;
96 }
97
98 memcpy(ret, str, siz);
99 ret[siz] = '\0';
100
101 return (ret);
102 }
103
104 void *BUF_memdup(const void *data, size_t siz)
105 {
106 void *ret;
107
108 if (data == NULL || siz >= INT_MAX)
109 return NULL;
110
111 ret = OPENSSL_malloc(siz);
112 if (ret == NULL) {
113 BUFerr(BUF_F_BUF_MEMDUP, ERR_R_MALLOC_FAILURE);
114 return NULL;
115 }
116 return memcpy(ret, data, siz);
117 }
118
119 size_t BUF_strlcpy(char *dst, const char *src, size_t size)
120 {
121 size_t l = 0;
122 for (; size > 1 && *src; size--) {
123 *dst++ = *src++;
124 l++;
125 }
126 if (size)
127 *dst = '\0';
128 return l + strlen(src);
129 }
130
131 size_t BUF_strlcat(char *dst, const char *src, size_t size)
132 {
133 size_t l = 0;
134 for (; size > 0 && *dst; size--, dst++)
135 l++;
136 return l + BUF_strlcpy(dst, src, size);
137 }