From 31bee986074c46112097542170f3506f1d3e5cc3 Mon Sep 17 00:00:00 2001
From: Delyan Angelov <delian66@gmail.com>
Date: Thu, 28 Apr 2022 11:30:36 +0300
Subject: [PATCH] eval: add support for C.read/3, C.malloc/1, `$if openbsd {`

---
 vlib/builtin/cfns.c.v |  6 +++---
 vlib/v/eval/expr.v    | 15 +++++++++++++--
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/vlib/builtin/cfns.c.v b/vlib/builtin/cfns.c.v
index 31e49c7cac..aab55f2e6c 100644
--- a/vlib/builtin/cfns.c.v
+++ b/vlib/builtin/cfns.c.v
@@ -10,11 +10,11 @@ fn C.memmove(dest voidptr, const_src voidptr, n usize) voidptr
 fn C.memset(str voidptr, c int, n usize) voidptr
 
 [trusted]
-fn C.calloc(int, int) &byte
+fn C.calloc(int, int) &u8
 
-fn C.malloc(int) &byte
+fn C.malloc(int) &u8
 
-fn C.realloc(a &byte, b int) &byte
+fn C.realloc(a &u8, b int) &u8
 
 fn C.free(ptr voidptr)
 
diff --git a/vlib/v/eval/expr.v b/vlib/v/eval/expr.v
index a30af29838..2e78ec5f0a 100644
--- a/vlib/v/eval/expr.v
+++ b/vlib/v/eval/expr.v
@@ -24,13 +24,21 @@ pub fn (mut e Eval) expr(expr ast.Expr, expecting ast.Type) Object {
 						e.error('c does not have methods')
 					}
 					match expr.name.all_after('C.') {
+						'read' {
+							return Int{C.read(args[0].int_val(), args[1] as voidptr, args[2].int_val()), 64}
+						}
 						'write' {
 							return Int{C.write(args[0].int_val(), args[1] as voidptr,
-								args[2].int_val()), 32}
+								args[2].int_val()), 64}
+						}
+						'malloc' {
+							return Ptr{
+								val: unsafe { C.malloc(args[0].int_val()) }
+							}
 						}
 						'calloc' {
 							return Ptr{
-								val: vcalloc(int(args[0].int_val() * args[1].int_val()))
+								val: unsafe { C.calloc(args[0].int_val(), args[1].int_val()) }
 							}
 						}
 						'getcwd' {
@@ -142,6 +150,9 @@ pub fn (mut e Eval) expr(expr ast.Expr, expecting ast.Type) Object {
 								'freebsd' {
 									do_if = e.pref.os == .freebsd
 								}
+								'openbsd' {
+									do_if = e.pref.os == .openbsd
+								}
 								'prealloc' {
 									do_if = e.pref.prealloc
 								}