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Special case for 'string.rep' over an empty string

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This commit is contained in:
Roberto I
2026-01-04 16:39:22 -03:00
parent 45c7ae5b1b
commit 5cfc725a8b
2 changed files with 5 additions and 5 deletions
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4
lauxlib.h
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@@ -81,7 +81,7 @@ LUALIB_API int (luaL_checkoption) (lua_State *L, int arg, const char *def,
LUALIB_API int (luaL_fileresult) (lua_State *L, int stat, const char *fname);
LUALIB_API int (luaL_execresult) (lua_State *L, int stat);
LUALIB_API void *luaL_alloc (void *ud, void *ptr, size_t osize,
LUALIB_API void *(luaL_alloc) (void *ud, void *ptr, size_t osize,
size_t nsize);
@@ -103,7 +103,7 @@ LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s);
LUALIB_API lua_State *(luaL_newstate) (void);
LUALIB_API unsigned luaL_makeseed (lua_State *L);
LUALIB_API unsigned (luaL_makeseed) (lua_State *L);
LUALIB_API lua_Integer (luaL_len) (lua_State *L, int idx);

4
lstrlib.c
View File

@@ -141,8 +141,8 @@ static int str_rep (lua_State *L) {
const char *s = luaL_checklstring(L, 1, &len);
lua_Integer n = luaL_checkinteger(L, 2);
const char *sep = luaL_optlstring(L, 3, "", &lsep);
if (n <= 0)
lua_pushliteral(L, "");
if (n <= 0 || (len | lsep) == 0)
lua_pushliteral(L, ""); /* no repetitions or both strings empty */
else if (l_unlikely(len > MAX_SIZE - lsep ||
cast_st2S(len + lsep) > cast_st2S(MAX_SIZE) / n))
return luaL_error(L, "resulting string too large");