1 files changed, 72 insertions, 0 deletions
diff --git a/src/string_functions.c b/src/string_functions.c
new file mode 100644
index 0000000..bcf42ae
--- /dev/null
+++ b/src/string_functions.c
@@ -0,0 +1,72 @@
+/*
+ * active port forwarder - software for secure forwarding
+ * Copyright (C) 2003-2007 jeremian <jeremian [at] poczta.fm>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "string_functions.h"
+
+/*
+ * Function name: string_cp
+ * Description: Firstly, the memory allocated for *dest is released. After this, new memory is allocated
+ *              and string from src is copied to newly created location. *dest is pointing to new string.
+ * Arguments: dest - pointer to pointer to string previously allocated by malloc family functions.
+ *                   If dest is NULL, memory will be allocated and returned from the function. In the
+ *                   latter case dest will be unchanged
+ *            src - string containing data for copying. If src is NULL, new memory is not allocated, but
+ *                  the old one is still released.
+ * Returns: The newly allocated string.
+ */
+
+char*
+string_cp(char** dest, char* src)
+{
+  char* tmp;
+  int len = 0;
+
+  /* 1. releasing memory allocated by *dest */
+  if (dest != NULL) {
+    if ((*dest) != NULL) {
+      /* if *dest points to the same memory as src - we shouldn't do anything */
+      if ((*dest) == src) {
+        return (*dest);
+      }
+      free((*dest));
+      (*dest) = NULL;
+    }
+  }
+  /* if src is null, there is nothing more to do */
+  if (src == NULL) {
+    return NULL;
+  }
+  /* 2. allocating new memory */
+  len = strlen(src);
+  tmp = calloc(1, len + 1);
+  if (tmp == NULL) {
+    return NULL;
+  }
+  /* 3. copying data from src */
+  strncpy(tmp, src, len);
+  if (dest != NULL) {
+    (*dest) = tmp;
+  }
+  return tmp;
+}