1 files changed, 74 insertions, 0 deletions
diff --git a/lib/strbuf.c b/lib/strbuf.c
new file mode 100644
index 0000000..fa2d913
--- /dev/null
+++ b/lib/strbuf.c
@@ -0,0 +1,74 @@
+/* ----------------------------------------------------------------------------
+   libconfig - A library for processing structured configuration files
+   Copyright (C) 2005-2020  Mark A Lindner
+
+   This file is part of libconfig.
+
+   This library 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 2.1 of
+   the License, or (at your option) any later version.
+
+   This library 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 Library General Public
+   License along with this library; if not, see
+   <http://www.gnu.org/licenses/>.
+   ----------------------------------------------------------------------------
+*/
+
+#include "strbuf.h"
+#include "util.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#define STRING_BLOCK_SIZE 64
+
+/* ------------------------------------------------------------------------- */
+
+void libconfig_strbuf_ensure_capacity(strbuf_t *buf, size_t len)
+{
+  static const size_t mask = ~(STRING_BLOCK_SIZE - 1);
+
+  size_t newlen = buf->length + len + 1; /* add 1 for NUL */
+  if(newlen > buf->capacity)
+  {
+    buf->capacity = (newlen + (STRING_BLOCK_SIZE - 1)) & mask;
+    buf->string = (char *)realloc(buf->string, buf->capacity);
+  }
+}
+
+/* ------------------------------------------------------------------------- */
+
+char *libconfig_strbuf_release(strbuf_t *buf)
+{
+  char *r = buf->string;
+  __zero(buf);
+  return(r);
+}
+
+/* ------------------------------------------------------------------------- */
+
+void libconfig_strbuf_append_string(strbuf_t *buf, const char *s)
+{
+  size_t len = strlen(s);
+  libconfig_strbuf_ensure_capacity(buf, len);
+  strcpy(buf->string + buf->length, s);
+  buf->length += len;
+}
+
+/* ------------------------------------------------------------------------- */
+
+void libconfig_strbuf_append_char(strbuf_t *buf, char c)
+{
+  libconfig_strbuf_ensure_capacity(buf, 1);
+  *(buf->string + buf->length) = c;
+  ++(buf->length);
+  *(buf->string + buf->length) = '\0';
+}
+
+/* ------------------------------------------------------------------------- */