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