moved yna to exchange

src/include/taler_util.h

@@ -298,4 +298,41 @@ char *
 TALER_xtalerbank_account_from_payto (const char *payto);
 
 
+/**
+ * Possible values for a binary filter.
+ */
+enum TALER_EXCHANGE_YesNoAll
+{
+  /**
+   * If condition is yes.
+   */
+  TALER_EXCHANGE_YNA_YES = 1,
+
+  /**
+  * If condition is no.
+  */
+  TALER_EXCHANGE_YNA_NO = 2,
+
+  /**
+   * Condition disabled.
+   */
+  TALER_EXCHANGE_YNA_ALL = 3
+};
+
+
+/**
+ * Convert query argument to @a yna value.
+ *
+ * @param connection connection to take query argument from
+ * @param arg argument to try for
+ * @param default_val value to assign if the argument is not present
+ * @param[out] value to set
+ * @return true on success, false if the parameter was malformed
+ */
+bool
+TALER_arg_to_yna (struct MHD_Connection *connection,
+                  const char *arg,
+                  enum TALER_EXCHANGE_YesNoAll default_val,
+                  enum TALER_EXCHANGE_YesNoAll *yna);
+
 #endif

src/util/Makefile.am

@@ -42,6 +42,7 @@ libtalerutil_la_SOURCES = \
   payto.c \
   url.c \
   util.c \
+  yna.c \
   os_installation.c
 
 libtalerutil_la_LIBADD = \

src/util/yna.c

@@ -0,0 +1,66 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2020 Taler Systems SA
+
+  TALER 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, or (at your option) any later version.
+
+  TALER 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
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file yna.c
+ * @brief Utility functions for yes/no/all filters
+ * @author Jonathan Buchanan
+ */
+#include "platform.h"
+#include "taler_util.h"
+
+
+/**
+ * Convert query argument to @a yna value.
+ *
+ * @param connection connection to take query argument from
+ * @param arg argument to try for
+ * @param default_val value to assign if the argument is not present
+ * @param[out] value to set
+ * @return true on success, false if the parameter was malformed
+ */
+bool
+TALER_arg_to_yna (struct MHD_Connection *connection,
+                  const char *arg,
+                  enum TALER_EXCHANGE_YesNoAll default_val,
+                  enum TALER_EXCHANGE_YesNoAll *yna)
+{
+  const char *str;
+
+  str = MHD_lookup_connection_value (connection,
+                                     MHD_GET_ARGUMENT_KIND,
+                                     arg);
+  if (NULL == str)
+  {
+    *yna = default_val;
+    return true;
+  }
+  if (0 == strcasecmp (str, "yes"))
+  {
+    *yna = TALER_EXCHANGE_YNA_YES;
+    return true;
+  }
+  if (0 == strcasecmp (str, "no"))
+  {
+    *yna = TALER_EXCHANGE_YNA_NO;
+    return true;
+  }
+  if (0 == strcasecmp (str, "all"))
+  {
+    *yna = TALER_EXCHANGE_YNA_ALL;
+    return true;
+  }
+  return false;
+}