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+/* xmemdup0.c -- copy a block of arbitrary bytes, plus a trailing NUL
+
+ Copyright (C) 2008-2022 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include "xmemdup0.h"
+#include "xalloc.h"
+
+#include <string.h>
+
+/* Clone an arbitrary block of bytes P of size S, with error checking,
+ and include a terminating NUL byte. P is of type 'void const *',
+ to make it easier to use this with other mem* functions that return
+ 'void *', but since appending a NUL byte only makes sense on bytes,
+ the return type is 'char *'.
+
+ The terminating NUL makes it safe to use strlen or rawmemchr to
+ check for embedded NUL; it also speeds up algorithms such as escape
+ sequence processing on arbitrary memory, by making it always safe
+ to read the byte after the escape character rather than having to
+ check if each escape character is the last byte in the object. */
+
+char *
+xmemdup0 (void const *p, size_t s)
+{
+ char *result = xcharalloc (s + 1);
+ if (s > 0)
+ memcpy (result, p, s);
+ result[s] = 0;
+ return result;
+}