Geolocation: Base Asterisk Prereqs

* Added ast_variable_list_from_quoted_string()
  Parse a quoted string into an ast_variable list.

* Added ast_str_substitute_variables_full2()
  Perform variable/function/expression substitution on an ast_str.

* Added ast_strsep_quoted()
  Like ast_strsep except you can specify a specific quote character.
  Also added unit test.

* Added ast_xml_find_child_element()
  Find a direct child element by name.

* Added ast_xml_doc_dump_memory()
  Dump the specified document to a buffer

* ast_datastore_free() now checks for a NULL datastore
  before attempting to destroy it.

Change-Id: I5dcefed2f5f93a109e8b489e18d80d42e45244ec

main/utils.c

@@ -1859,6 +1859,67 @@ char *ast_strsep(char **iss, const char sep, uint32_t flags)
 	return st;
 }
 
+char *ast_strsep_quoted(char **iss, const char sep, const char quote, uint32_t flags)
+{
+	char *st = *iss;
+	char *is;
+	int inquote = 0;
+	int found = 0;
+	char stack[8];
+	const char qstr[] = { quote };
+
+	if (ast_strlen_zero(st)) {
+		return NULL;
+	}
+
+	memset(stack, 0, sizeof(stack));
+
+	for(is = st; *is; is++) {
+		if (*is == '\\') {
+			if (*++is != '\0') {
+				is++;
+			} else {
+				break;
+			}
+		}
+
+		if (*is == quote) {
+			if (*is == stack[inquote]) {
+				stack[inquote--] = '\0';
+			} else {
+				if (++inquote >= sizeof(stack)) {
+					return NULL;
+				}
+				stack[inquote] = *is;
+			}
+		}
+
+		if (*is == sep && !inquote) {
+			*is = '\0';
+			found = 1;
+			*iss = is + 1;
+			break;
+		}
+	}
+	if (!found) {
+		*iss = NULL;
+	}
+
+	if (flags & AST_STRSEP_STRIP) {
+		st = ast_strip_quoted(st, qstr, qstr);
+	}
+
+	if (flags & AST_STRSEP_TRIM) {
+		st = ast_strip(st);
+	}
+
+	if (flags & AST_STRSEP_UNESCAPE) {
+		ast_unescape_quoted(st);
+	}
+
+	return st;
+}
+
 char *ast_unescape_semicolon(char *s)
 {
 	char *e;