[vala/wip/profile-posix: 25/28] posix: Bind va_list and add string.concat() (POSIX)

[Rico Tzschichholz <ricotz src gnome org>]

commit 51b27de1294b80b6d1dda86b123a01c58cff29d5
Author: Dr. Michael Lauer <mickey vanille-media de>
Date:   Fri Mar 16 15:33:08 2018 +0100

    posix: Bind va_list and add string.concat() (POSIX)
    
    This fixes string templates when using the POSIX profile.

 vapi/posix.vapi |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)
---
diff --git a/vapi/posix.vapi b/vapi/posix.vapi
index 06a07d9..b7c3a68 100644
--- a/vapi/posix.vapi
+++ b/vapi/posix.vapi
@@ -251,6 +251,17 @@ public struct time_t {
        public time_t ();
 }
 
+[SimpleType]
+[CCode (cheader_filename = "stdarg.h", cprefix = "va_", has_type_id = false, destroy_function = "va_end", 
lvalue_access = false)]
+public struct va_list {
+       [CCode (cname = "va_start")]
+       public va_list ();
+       [CCode (cname = "va_copy")]
+       public va_list.copy (va_list src);
+       [CCode (generic_type_pos = 1.1, simple_generics = true)]
+       public unowned G arg<G> ();
+}
+
 [Compact]
 [Immutable]
 [CCode (cname = "char", const_cname = "const char", copy_function = "strdup", free_function = "free", 
cheader_filename = "stdlib.h,string.h")]
@@ -271,6 +282,20 @@ public class string {
        [PrintfFormat]
        public string printf (...);
 
+       public string concat (...) {
+               string result = this;
+               var l = va_list ();
+               while (true) {
+                       unowned string? arg = l.arg ();
+                       if (arg == null) {
+                               break;
+                       } else {
+                               result = "%s%s".printf (result, arg);
+                       }
+               }
+               return result;
+       }
+
        public inline unowned string to_string () {
                return this;
        }