From dfebe439db76b5c9fd9b4e3877857e2449c8ad87 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 13 Mar 2019 14:04:01 -0300
Subject: New conversion specifier '%p' for 'string.format'

The call 'string.format("%p", val)' gives a Lua equivalent to the
C API function 'lua_topointer'.
---
 lstrlib.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lstrlib.c')

diff --git a/lstrlib.c b/lstrlib.c
index ab4258e5..6230cd0c 100644
--- a/lstrlib.c
+++ b/lstrlib.c
@@ -1185,6 +1185,11 @@ static int str_format (lua_State *L) {
           nb = l_sprintf(buff, MAX_ITEM, form, (LUAI_UACNUMBER)n);
           break;
         }
+        case 'p': {
+          const void *p = lua_topointer(L, arg);
+          nb = l_sprintf(buff, MAX_ITEM, form, p);
+          break;
+        }
         case 'q': {
           if (form[2] != '\0')  /* modifiers? */
             return luaL_error(L, "specifier '%%q' cannot have modifiers");
-- 
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