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/* lt__strl.c -- size-bounded string copying and concatenation |
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|
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Copyright (C) 2004 Free Software Foundation, Inc. |
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Written by Bob Friesenhahn, 2004 |
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|
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NOTE: The canonical source of this file is maintained with the |
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GNU Libtool package. Report bugs to bug-libtool@gnu.org. |
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|
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GNU Libltdl is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2 of the License, or (at your option) any later version. |
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|
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As a special exception to the GNU Lesser General Public License, |
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if you distribute this file as part of a program or library that |
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is built using GNU Libtool, you may include this file under the |
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same distribution terms that you use for the rest of that program. |
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|
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GNU Libltdl is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Lesser General Public License for more details. |
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|
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You should have received a copy of the GNU Lesser General Public |
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License along with GNU Libltdl; see the file COPYING.LIB. If not, a |
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copy can be downloaded from http://www.gnu.org/licenses/lgpl.html, |
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or obtained by writing to the Free Software Foundation, Inc., |
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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*/ |
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|
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#include <assert.h> |
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#include <string.h> |
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|
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#include "lt__strl.h" |
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|
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/* |
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lt_strlcat appends the NULL-terminated string src to the end of dst. |
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It will append at most dstsize - strlen(dst) - 1 bytes, |
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NULL-terminating the result. The total length of the string which |
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would have been created given sufficient buffer size (may be longer |
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than dstsize) is returned. This function substitutes for strlcat() |
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which is available under NetBSD, FreeBSD and Solaris 9. |
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|
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Buffer overflow can be checked as follows: |
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|
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if (lt_strlcat(dst, src, dstsize) >= dstsize) |
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return -1; |
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*/ |
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#if !defined(HAVE_STRLCAT) |
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size_t |
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lt_strlcat(char *dst, const char *src, const size_t dstsize) |
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{ |
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size_t length; |
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char *p; |
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const char *q; |
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|
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assert(dst != NULL); |
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assert(src != (const char *) NULL); |
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assert(dstsize >= 1); |
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|
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length=strlen(dst); |
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|
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/* |
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Copy remaining characters from src while constraining length to |
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size - 1. |
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*/ |
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for ( p = dst + length, q = src; |
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(*q != 0) && (length < dstsize - 1) ; |
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length++, p++, q++ ) |
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*p = *q; |
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|
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dst[length]='\0'; |
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|
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/* |
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Add remaining length of src to length. |
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*/ |
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while (*q++) |
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length++; |
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|
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return length; |
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} |
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#endif /* !defined(HAVE_STRLCAT) */ |
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|
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/* |
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lt_strlcpy copies up to dstsize - 1 characters from the NULL-terminated |
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string src to dst, NULL-terminating the result. The total length of |
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the string which would have been created given sufficient buffer |
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size (may be longer than dstsize) is returned. This function |
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substitutes for strlcpy() which is available under OpenBSD, FreeBSD |
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and Solaris 9. |
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|
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Buffer overflow can be checked as follows: |
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|
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if (lt_strlcpy(dst, src, dstsize) >= dstsize) |
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return -1; |
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*/ |
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#if !defined(HAVE_STRLCPY) |
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size_t |
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lt_strlcpy(char *dst, const char *src, const size_t dstsize) |
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{ |
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size_t length=0; |
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char *p; |
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const char *q; |
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|
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assert(dst != NULL); |
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assert(src != (const char *) NULL); |
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assert(dstsize >= 1); |
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|
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/* |
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Copy src to dst within bounds of size-1. |
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*/ |
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for ( p=dst, q=src, length=0 ; |
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(*q != 0) && (length < dstsize-1) ; |
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length++, p++, q++ ) |
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*p = *q; |
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|
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dst[length]='\0'; |
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|
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/* |
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Add remaining length of src to length. |
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*/ |
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while (*q++) |
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length++; |
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|
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return length; |
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} |
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#endif /* !defined(HAVE_STRLCPY) */ |