builtin: x.vstring() instead of string(x) (#6102)

vlib/mysql/mysql.v

@@ -116,7 +116,7 @@ pub fn (conn Connection) escape_string(s string) string {
     quote := byte(39) // single quote
 
     C.mysql_real_escape_string_quote(conn.conn, to, s.str, len, quote)
-    return string(to)
+    return unsafe { to.vstring() }
 }
 
 // set_option is used to set extra connect options and affect behavior for a connection.
@@ -175,12 +175,12 @@ pub fn (conn Connection) info() string {
 
 // get_host_info returns a string describing the connection.
 pub fn (conn Connection) get_host_info() string {
-	return string(C.mysql_get_host_info(conn.conn))
+	return unsafe { C.mysql_get_host_info(conn.conn).vstring() }
 }
 
 // get_server_info returns the server version number as a string.
 pub fn (conn Connection) get_server_info() string {
-	return string(C.mysql_get_server_info(conn.conn))
+	return unsafe { C.mysql_get_server_info(conn.conn).vstring() }
 }
 
 // get_server_version returns the server version number as an integer.
@@ -192,7 +192,7 @@ pub fn (conn Connection) get_server_version() u64 {
 
 // get_client_info returns client version information as a string.
 pub fn get_client_info() string {
-	return string(C.mysql_get_client_info())
+	return unsafe { C.mysql_get_client_info().vstring() }
 }
 
 // get_client_version returns client version information as an integer.

vlib/mysql/result.v

@@ -34,7 +34,7 @@ pub fn (r Result) rows() []Row {
 			if rr[i] == 0 {
 				row.vals << ''
 			} else {
-				row.vals << string(&byte(rr[i]))
+				row.vals << mystring( byteptr(rr[i]) )
 			}
 		}
 		rows << row
@@ -64,12 +64,12 @@ pub fn (r Result) fields() []Field {
 	orig_fields := C.mysql_fetch_fields(r.result)
 	for i in 0..nr_cols {
 		fields << Field{
-			name: string(orig_fields[i].name)
-			org_name: string(orig_fields[i].org_name)
-			table: string(orig_fields[i].table)
-			org_table: string(orig_fields[i].org_table)
-			db: string(orig_fields[i].db)
-			catalog: string(orig_fields[i].catalog)
+			name: mystring(orig_fields[i].name)
+			org_name: mystring(orig_fields[i].org_name)
+			table: mystring(orig_fields[i].table)
+			org_table: mystring(orig_fields[i].org_table)
+			db: mystring(orig_fields[i].db)
+			catalog: mystring(orig_fields[i].catalog)
 			def: resolve_nil_str(orig_fields[i].def)
 			length: orig_fields.length
 			max_length: orig_fields.max_length

vlib/mysql/utils.v

@@ -2,7 +2,7 @@ module mysql
 
 // get_error_msg returns error message from MySQL instance.
 fn get_error_msg(conn &C.MYSQL) string {
-	return string(C.mysql_error(conn))
+	return unsafe { C.mysql_error(conn).vstring() }
 }
 
 // get_errno returns error number from MySQL instance.
@@ -13,5 +13,12 @@ fn get_errno(conn &C.MYSQL) int {
 // resolve_nil_str returns empty string if passed value is a nil pointer.
 fn resolve_nil_str(ptr byteptr) string {
 	if isnil(ptr) { return '' }
-	return string(ptr)
+	return unsafe { ptr.vstring() }
+}
+
+[inline]
+fn mystring(b byteptr) string {
+	unsafe {
+		return b.vstring()
+	}
 }