Imported Debian patch 0.63.0-6

[hcoop/debian/courier-authlib.git] / libltdl / lt__strl.c

diff --git a/libltdl/lt__strl.c b/libltdl/lt__strl.c
new file mode 100644 (file)
index 0000000..c2cee58
--- /dev/null
+++ b/libltdl/lt__strl.c
@@ -0,0 +1,127 @@
+/* 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) */