From 036bb181d59364d13207225bac25b419485a3df7 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Fri, 15 Dec 2017 15:19:45 +1100
Subject: src/: Add defs.from_userstring function to take string from api

---
 src/defs.js    |  6 ++++++
 src/lapi.js    | 25 ++++++++++---------------
 src/ldebug.js  |  1 +
 src/lobject.js |  1 +
 4 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/src/defs.js b/src/defs.js
index 381114b..a2c5c75 100644
--- a/src/defs.js
+++ b/src/defs.js
@@ -247,6 +247,11 @@ const to_luastring = function(str, cache) {
     return outU8Array;
 };
 
+const from_userstring = function(str) {
+    assert(is_luastring(str), "expects an array of bytes");
+    return str;
+};
+
 /*
 ** Event codes
 */
@@ -429,3 +434,4 @@ module.exports.string_of               = string_of;
 module.exports.to_jsstring             = to_jsstring;
 module.exports.to_luastring            = to_luastring;
 module.exports.to_uristring            = to_uristring;
+module.exports.from_userstring         = from_userstring;
diff --git a/src/lapi.js b/src/lapi.js
index 111735f..b42ad92 100644
--- a/src/lapi.js
+++ b/src/lapi.js
@@ -236,7 +236,8 @@ const lua_pushlstring = function(L, s, len) {
     if (len === 0) {
         s = defs.to_luastring("", true);
     } else {
-        assert(defs.is_luastring(s) && s.length >= len, "lua_pushlstring expects array of byte");
+        s = defs.from_userstring(s);
+        assert(s.length >= len, "invalid length to lua_pushlstring");
         s = s.slice(0, len);
     }
     ts = lstring.luaS_bless(L, s);
@@ -247,13 +248,11 @@ const lua_pushlstring = function(L, s, len) {
 };
 
 const lua_pushstring = function (L, s) {
-    assert(defs.is_luastring(s) || s === undefined || s === null, "lua_pushstring expects array of byte");
-
     if (s === undefined || s === null) {
         L.stack[L.top] = new TValue(CT.LUA_TNIL, null);
         L.top++;
     } else {
-        let ts = lstring.luaS_new(L, s);
+        let ts = lstring.luaS_new(L, defs.from_userstring(s));
         lobject.pushsvalue2s(L, ts);
         s = ts.getstr(); /* internal copy */
     }
@@ -263,23 +262,22 @@ const lua_pushstring = function (L, s) {
 };
 
 const lua_pushvfstring = function (L, fmt, argp) {
-    assert(defs.is_luastring(fmt));
+    fmt = defs.from_userstring(fmt);
     return lobject.luaO_pushvfstring(L, fmt, argp);
 };
 
 const lua_pushfstring = function (L, fmt, ...argp) {
-    assert(defs.is_luastring(fmt));
+    fmt = defs.from_userstring(fmt);
     return lobject.luaO_pushvfstring(L, fmt, argp);
 };
 
 /* Similar to lua_pushstring, but takes a JS string */
 const lua_pushliteral = function (L, s) {
-    assert(typeof s === "string" || s === undefined || s === null, "lua_pushliteral expects a JS string");
-
     if (s === undefined || s === null) {
         L.stack[L.top] = new TValue(CT.LUA_TNIL, null);
         L.top++;
     } else {
+        assert(typeof s === "string", "lua_pushliteral expects a JS string");
         let ts = lstring.luaS_newliteral(L, s);
         lobject.pushsvalue2s(L, ts);
         s = ts.getstr(); /* internal copy */
@@ -351,9 +349,7 @@ const lua_pushglobaltable = function(L) {
 ** t[k] = value at the top of the stack (where 'k' is a string)
 */
 const auxsetstr = function(L, t, k) {
-    assert(defs.is_luastring(k), "key must be an array of bytes");
-
-    let str = lstring.luaS_new(L, k);
+    let str = lstring.luaS_new(L, defs.from_userstring(k));
     assert(1 < L.top - L.ci.funcOff, "not enough elements in the stack");
     lobject.pushsvalue2s(L, str); /* push 'str' (to make it a TValue) */
     assert(L.top <= L.ci.top, "stack overflow");
@@ -465,8 +461,7 @@ const lua_rawsetp = function(L, idx, p) {
 */
 
 const auxgetstr = function(L, t, k) {
-    assert(defs.is_luastring(k), "key must be an array of bytes");
-    let str = lstring.luaS_new(L, k);
+    let str = lstring.luaS_new(L, defs.from_userstring(k));
     lobject.pushsvalue2s(L, str);
     assert(L.top <= L.ci.top, "stack overflow");
     lvm.luaV_gettable(L, t, L.stack[L.top - 1], L.top - 1);
@@ -904,8 +899,8 @@ const lua_arith = function(L, op) {
 const default_chunkname = defs.to_luastring("?");
 const lua_load = function(L, reader, data, chunkname, mode) {
     if (!chunkname) chunkname = default_chunkname;
-    else assert(defs.is_luastring(chunkname), "lua_load expect an array of byte as chunkname");
-    assert(mode ? defs.is_luastring(mode) : true, "lua_load expect an array of byte as mode");
+    else chunkname = defs.from_userstring(chunkname);
+    if (mode !== null) mode = defs.from_userstring(mode);
     let z = new lzio.ZIO(L, reader, data);
     let status = ldo.luaD_protectedparser(L, z, chunkname, mode);
     if (status === TS.LUA_OK) {  /* no errors? */
diff --git a/src/ldebug.js b/src/ldebug.js
index c93df91..1bb7a8a 100644
--- a/src/ldebug.js
+++ b/src/ldebug.js
@@ -266,6 +266,7 @@ const auxgetinfo = function(L, what, ar, f, ci) {
 };
 
 const lua_getinfo = function(L, what, ar) {
+    what = defs.from_userstring(what);
     let status, cl, ci, func;
     swapextra(L);
     if (what[0] === '>'.charCodeAt(0)) {
diff --git a/src/lobject.js b/src/lobject.js
index c02bc91..1b490f3 100644
--- a/src/lobject.js
+++ b/src/lobject.js
@@ -547,6 +547,7 @@ const luaO_pushvfstring = function(L, fmt, argp) {
                 let s = argp[a++];
                 if (s === null) s = defs.to_luastring("(null)", true);
                 else {
+                    s = defs.from_userstring(s);
                     /* respect null terminator */
                     let i = s.indexOf(0);
                     if (i !== -1)
-- 
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