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-rw-r--r--src/lstrlib.js10
1 files changed, 7 insertions, 3 deletions
diff --git a/src/lstrlib.js b/src/lstrlib.js
index c132e02..9104078 100644
--- a/src/lstrlib.js
+++ b/src/lstrlib.js
@@ -24,6 +24,11 @@ const LUA_MAXCAPTURES = 32;
// (sizeof(size_t) < sizeof(int) ? MAX_SIZET : (size_t)(INT_MAX))
const MAXSIZE = 2147483647;
+/* Give natural (i.e. strings end at the first \0) length of a string represented by an array of bytes */
+const strlen = function(s) {
+ let len = s.indexOf(0);
+ return len > -1 ? len : s.length;
+};
/* translate a relative string position: negative means back from end */
const posrelat = function(pos, len) {
@@ -327,12 +332,11 @@ const str_format = function(L) {
case 's': {
strfrmt = strfrmt.slice(1);
let s = lauxlib.luaL_tolstring(L, arg);
- if (form[2] === char['\0']) { /* no modifiers? */
+ if (form.length <= 2 || form[2] === 0) { /* no modifiers? */
concat(b, s); /* keep entire string */
lapi.lua_pop(L, 1); /* remove result from 'luaL_tolstring' */
} else {
- let zero = s.indexOf(0);
- lauxlib.luaL_argcheck(L, zero < 0 || zero === s.length - 1, arg, lua.to_luastring("string contains zeros"));
+ lauxlib.luaL_argcheck(L, s.length === strlen(s), arg, lua.to_luastring("string contains zeros"));
if (form.indexOf(char['.']) < 0 && s.length >= 100) {
/* no precision and string is too long to be formatted */
concat(b, s); /* keep entire string */