diff -r 3769ba002fd1 -r f04ab0420512 libidav/davqlexec.h
--- a/libidav/davqlexec.h	Thu Feb 01 16:31:24 2018 +0100
+++ b/libidav/davqlexec.h	Thu Feb 01 18:25:23 2018 +0100
@@ -1,7 +1,7 @@
 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
- * Copyright 2016 Olaf Wintermann. All rights reserved.
+ * Copyright 2018 Olaf Wintermann. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -42,8 +42,27 @@
 typedef struct DavQLStackObj DavQLStackObj;
 typedef struct DavQLRes      DavQLRes;
 
+typedef struct DavQLArg      DavQLArg;
+typedef struct DavQLArgList  DavQLArgList;
+
 typedef void*(*davql_func)(); // TODO: interface?
 
+struct DavQLArg {
+    int type;
+    union DavQLArgValue{
+        int          d;
+        unsigned int u;
+        char         *s;
+        time_t       t;
+    } value;
+    DavQLArg *next;
+};
+
+struct DavQLArgList {
+    DavQLArg *first;
+    DavQLArg *current;
+};
+
 typedef enum {
     DAVQL_OK = 0,
     DAVQL_UNSUPPORTED_FORMATCHAR,
@@ -134,18 +153,26 @@
     } column;
     _Bool descending;
 } DavOrderCriterion;
-    
+
+DavQLArgList* dav_ql_get_args(DavQLStatement *st, va_list ap);
+void dav_ql_free_arglist(DavQLArgList *args);
+
+int dav_ql_getarg_int(DavQLArgList *args);
+unsigned int dav_ql_getarg_uint(DavQLArgList *args);
+char* dav_ql_getarg_str(DavQLArgList *args);
+time_t dav_ql_getarg_time(DavQLArgList *args);
+
 DavResult dav_statement_exec(DavSession *sn, DavQLStatement *st, ...);
 DavResult dav_statement_execv(DavSession *sn, DavQLStatement *st, va_list ap);
 
-UcxBuffer* dav_path_string(sstr_t src, va_list ap, davqlerror_t *error);
-sstr_t dav_format_string(UcxAllocator *a, sstr_t fstr, va_list ap, davqlerror_t *error);
+UcxBuffer* dav_path_string(sstr_t src, DavQLArgList *args, davqlerror_t *error);
+sstr_t dav_format_string(UcxAllocator *a, sstr_t fstr, DavQLArgList *ap, davqlerror_t *error);
 
 DavResult dav_exec_select(DavSession *sn, DavQLStatement *st, va_list ap);
 
 int dav_identifier2resprop(sstr_t src, davqlresprop_t *prop);
 
-UcxBuffer* dav_compile_expr(DavContext *ctx, UcxAllocator *a, DavQLExpression *lexpr, va_list ap);
+UcxBuffer* dav_compile_expr(DavContext *ctx, UcxAllocator *a, DavQLExpression *lexpr, DavQLArgList *ap);
 
 int dav_exec_expr(UcxBuffer *bcode, DavResource *res, DavQLStackObj *result);