diff options
author | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2021-09-22 13:10:39 -0300 |
---|---|---|
committer | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2021-09-22 13:10:39 -0300 |
commit | deac067ed39a44c001599c0d15de09872496b2aa (patch) | |
tree | d7373651e7d54a8ca5ffa4841379a4d9149164aa /lauxlib.h | |
parent | 2ff34717227b8046b0fdcb96206f11f5e888664e (diff) | |
download | lua-github-deac067ed39a44c001599c0d15de09872496b2aa.tar.gz |
Avoid overflows when incrementing parameters in C
Any C function can receive maxinteger as an integer argument, and
therefore cannot increment it without some care (e.g., doing unsigned
arithmetic as the core does).
Diffstat (limited to 'lauxlib.h')
-rw-r--r-- | lauxlib.h | 8 |
1 files changed, 8 insertions, 0 deletions
@@ -154,6 +154,14 @@ LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname, #define luaL_loadbuffer(L,s,sz,n) luaL_loadbufferx(L,s,sz,n,NULL) +/* +** Perform arithmetic operations on lua_Integer values with wrap-around +** semantics, as the Lua core does. +*/ +#define luaL_intop(op,v1,v2) \ + ((lua_Integer)((lua_Unsigned)(v1) op (lua_Unsigned)(v2))) + + /* push the value used to represent failure/error */ #define luaL_pushfail(L) lua_pushnil(L) |