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Added test for NULL in string.format("%p")

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ISO C states that standard library functions should not be called
with NULL arguments, unless stated otherwise. 'sprintf' does not
state otherwise, and it doesn't hurt to be on the safe side.
This commit is contained in:
Roberto Ierusalimschy 2019-12-17 10:49:55 -03:00
parent 3747487320
commit e0cbaa50fa
1 changed files with 2 additions and 0 deletions
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2
lstrlib.c
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@ -1271,6 +1271,8 @@ static int str_format (lua_State *L) {
} }
case 'p': { case 'p': {
const void *p = lua_topointer(L, arg); const void *p = lua_topointer(L, arg);
if (p == NULL)
p = "(null)"; /* NULL not a valid parameter in ISO C 'printf' */
nb = l_sprintf(buff, maxitem, form, p); nb = l_sprintf(buff, maxitem, form, p);
break; break;
} }