[vala/wip/mickey/posix-profile: 2/2] posix: (POSIX profile) bind va_list and add string.concat

[Dr. Michael Lauer <mlauer src gnome org>]

commit 9fd331654fbe1d274a5b0f670207067ecb73b02a
Author: Dr. Michael Lauer <mickey vanille-media de>
Date:   Fri Mar 16 15:33:08 2018 +0100

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

 vapi/posix.vapi |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)
---
diff --git a/vapi/posix.vapi b/vapi/posix.vapi
index 0bfc879..0c1397b 100644
--- a/vapi/posix.vapi
+++ b/vapi/posix.vapi
@@ -131,6 +131,17 @@ public struct ssize_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> ();
+}
+
 [CCode (cname = "int8_t", cheader_filename = "stdint.h", default_value = "0")]
 [IntegerType (rank = 1, min = -128, max = 127)]
 public struct int8 {
@@ -271,6 +282,21 @@ public class string {
        [PrintfFormat]
        public string printf (...);
 
+       public string concat (...) {
+               string result = this;
+               var l = va_list();
+               while (true) {
+                       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;
        }