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1 | /* lt__strl.c -- size-bounded string copying and concatenation | |
2 | ||
3 | Copyright (C) 2004 Free Software Foundation, Inc. | |
4 | Written by Bob Friesenhahn, 2004 | |
5 | ||
6 | NOTE: The canonical source of this file is maintained with the | |
7 | GNU Libtool package. Report bugs to bug-libtool@gnu.org. | |
8 | ||
9 | GNU Libltdl is free software; you can redistribute it and/or | |
10 | modify it under the terms of the GNU Lesser General Public | |
11 | License as published by the Free Software Foundation; either | |
12 | version 2 of the License, or (at your option) any later version. | |
13 | ||
14 | As a special exception to the GNU Lesser General Public License, | |
15 | if you distribute this file as part of a program or library that | |
16 | is built using GNU Libtool, you may include this file under the | |
17 | same distribution terms that you use for the rest of that program. | |
18 | ||
19 | GNU Libltdl is distributed in the hope that it will be useful, | |
20 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | GNU Lesser General Public License for more details. | |
23 | ||
24 | You should have received a copy of the GNU Lesser General Public | |
25 | License along with GNU Libltdl; see the file COPYING.LIB. If not, a | |
26 | copy can be downloaded from http://www.gnu.org/licenses/lgpl.html, | |
27 | or obtained by writing to the Free Software Foundation, Inc., | |
28 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
29 | */ | |
30 | ||
31 | #include <assert.h> | |
32 | #include <string.h> | |
33 | ||
34 | #include "lt__strl.h" | |
35 | ||
36 | /* | |
37 | lt_strlcat appends the NULL-terminated string src to the end of dst. | |
38 | It will append at most dstsize - strlen(dst) - 1 bytes, | |
39 | NULL-terminating the result. The total length of the string which | |
40 | would have been created given sufficient buffer size (may be longer | |
41 | than dstsize) is returned. This function substitutes for strlcat() | |
42 | which is available under NetBSD, FreeBSD and Solaris 9. | |
43 | ||
44 | Buffer overflow can be checked as follows: | |
45 | ||
46 | if (lt_strlcat(dst, src, dstsize) >= dstsize) | |
47 | return -1; | |
48 | */ | |
49 | #if !defined(HAVE_STRLCAT) | |
50 | size_t | |
51 | lt_strlcat(char *dst, const char *src, const size_t dstsize) | |
52 | { | |
53 | size_t length; | |
54 | char *p; | |
55 | const char *q; | |
56 | ||
57 | assert(dst != NULL); | |
58 | assert(src != (const char *) NULL); | |
59 | assert(dstsize >= 1); | |
60 | ||
61 | length=strlen(dst); | |
62 | ||
63 | /* | |
64 | Copy remaining characters from src while constraining length to | |
65 | size - 1. | |
66 | */ | |
67 | for ( p = dst + length, q = src; | |
68 | (*q != 0) && (length < dstsize - 1) ; | |
69 | length++, p++, q++ ) | |
70 | *p = *q; | |
71 | ||
72 | dst[length]='\0'; | |
73 | ||
74 | /* | |
75 | Add remaining length of src to length. | |
76 | */ | |
77 | while (*q++) | |
78 | length++; | |
79 | ||
80 | return length; | |
81 | } | |
82 | #endif /* !defined(HAVE_STRLCAT) */ | |
83 | ||
84 | /* | |
85 | lt_strlcpy copies up to dstsize - 1 characters from the NULL-terminated | |
86 | string src to dst, NULL-terminating the result. The total length of | |
87 | the string which would have been created given sufficient buffer | |
88 | size (may be longer than dstsize) is returned. This function | |
89 | substitutes for strlcpy() which is available under OpenBSD, FreeBSD | |
90 | and Solaris 9. | |
91 | ||
92 | Buffer overflow can be checked as follows: | |
93 | ||
94 | if (lt_strlcpy(dst, src, dstsize) >= dstsize) | |
95 | return -1; | |
96 | */ | |
97 | #if !defined(HAVE_STRLCPY) | |
98 | size_t | |
99 | lt_strlcpy(char *dst, const char *src, const size_t dstsize) | |
100 | { | |
101 | size_t length=0; | |
102 | char *p; | |
103 | const char *q; | |
104 | ||
105 | assert(dst != NULL); | |
106 | assert(src != (const char *) NULL); | |
107 | assert(dstsize >= 1); | |
108 | ||
109 | /* | |
110 | Copy src to dst within bounds of size-1. | |
111 | */ | |
112 | for ( p=dst, q=src, length=0 ; | |
113 | (*q != 0) && (length < dstsize-1) ; | |
114 | length++, p++, q++ ) | |
115 | *p = *q; | |
116 | ||
117 | dst[length]='\0'; | |
118 | ||
119 | /* | |
120 | Add remaining length of src to length. | |
121 | */ | |
122 | while (*q++) | |
123 | length++; | |
124 | ||
125 | return length; | |
126 | } | |
127 | #endif /* !defined(HAVE_STRLCPY) */ |