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`string.find' also accepts out-of-range indices

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This commit is contained in:
Roberto Ierusalimschy 2003-03-14 15:59:53 -03:00
parent c9ea94ec92
commit d8a3a00d84
1 changed files with 3 additions and 2 deletions
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5
lstrlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lstrlib.c,v 1.94 2003/02/12 09:10:41 roberto Exp roberto $
** $Id: lstrlib.c,v 1.95 2003/03/11 12:24:34 roberto Exp roberto $
** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h
*/
@ -478,7 +478,8 @@ static int str_find (lua_State *L) {
const char *s = luaL_checklstring(L, 1, &l1);
const char *p = luaL_checklstring(L, 2, &l2);
sint32 init = posrelat(luaL_optlong(L, 3, 1), l1) - 1;
luaL_argcheck(L, 0 <= init && (size_t)(init) <= l1, 3, "out of range");
if (init < 0) init = 0;
else if ((size_t)(init) > l1) init = l1;
if (lua_toboolean(L, 4) || /* explicit request? */
strpbrk(p, SPECIALS) == NULL) { /* or no special characters? */
/* do a plain search */