From e38ffce1844b5e68c1522e6aa6a2a89d6e3723f8 Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Sat, 9 Nov 2024 21:22:04 -0300
Subject: [PATCH] fix

---
 vlib/v/gen/c/str.v | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/vlib/v/gen/c/str.v b/vlib/v/gen/c/str.v
index 0b3bd067599334..09a273991ff3a1 100644
--- a/vlib/v/gen/c/str.v
+++ b/vlib/v/gen/c/str.v
@@ -64,6 +64,8 @@ fn (mut g Gen) gen_expr_to_string(expr ast.Expr, etype ast.Type) {
 	if is_shared {
 		typ = typ.clear_flag(.shared_f).set_nr_muls(0)
 	}
+	// original is_ptr for the typ (aliased type could overwrite it)
+	is_ptr := typ.is_ptr()
 	mut sym := g.table.sym(typ)
 	// when type is non-option alias and doesn't has `str()`, print the aliased value
 	if mut sym.info is ast.Alias && !sym.has_method('str') && !etype.has_flag(.option) {
@@ -113,7 +115,6 @@ fn (mut g Gen) gen_expr_to_string(expr ast.Expr, etype ast.Type) {
 		|| sym.kind in [.array, .array_fixed, .map, .struct, .multi_return, .sum_type, .interface] {
 		unwrap_option := expr is ast.Ident && expr.or_expr.kind == .propagate_option
 		exp_typ := if unwrap_option { typ.clear_flag(.option) } else { typ }
-		is_ptr := exp_typ.is_ptr()
 		is_dump_expr := expr is ast.DumpExpr
 		is_var_mut := expr.is_auto_deref_var()
 		str_fn_name := g.get_str_fn(exp_typ)
@@ -170,7 +171,7 @@ fn (mut g Gen) gen_expr_to_string(expr ast.Expr, etype ast.Type) {
 			if sym.is_c_struct() {
 				g.write(c_struct_ptr(sym, typ, str_method_expects_ptr))
 			} else {
-				g.write('*'.repeat(typ.nr_muls()))
+				g.write('*'.repeat(etype.nr_muls()))
 			}
 		} else if sym.is_c_struct() {
 			g.write(c_struct_ptr(sym, typ, str_method_expects_ptr))
@@ -201,11 +202,15 @@ fn (mut g Gen) gen_expr_to_string(expr ast.Expr, etype ast.Type) {
 			g.write('}}}))')
 		}
 	} else {
-		is_ptr := typ.is_ptr()
 		is_var_mut := expr.is_auto_deref_var()
 		str_fn_name := g.get_str_fn(typ)
-		g.write('${str_fn_name}(')
 		if sym.kind != .function {
+			if is_ptr && !is_var_mut {
+				g.write('isnil(')
+				g.expr_with_cast(expr, typ, typ)
+				g.write(') ? _SLIT("nil") : ')
+			}
+			g.write('${str_fn_name}(')
 			if str_method_expects_ptr && !is_ptr && !typ.has_flag(.option) {
 				g.write('&')
 			} else if (!str_method_expects_ptr && is_ptr && !is_shared) || is_var_mut {
@@ -216,10 +221,12 @@ fn (mut g Gen) gen_expr_to_string(expr ast.Expr, etype ast.Type) {
 				}
 			}
 			g.expr_with_cast(expr, typ, typ)
+			g.write(')')
 		} else if typ.has_flag(.option) {
 			// only Option fn receive argument
+			g.write('${str_fn_name}(')
 			g.expr_with_cast(expr, typ, typ)
+			g.write(')')
 		}
-		g.write(')')
 	}
 }