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small bug: a reader function should not modify the Lua stack

This commit is contained in:
Roberto Ierusalimschy 2012-04-27 11:13:19 -03:00
parent a94ce68e0a
commit fc24a3a6c4
1 changed files with 2 additions and 1 deletions
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3
lbaselib.c
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@ -1,5 +1,5 @@
/* /*
** $Id: lbaselib.c,v 1.272 2011/11/30 12:42:21 roberto Exp roberto $ ** $Id: lbaselib.c,v 1.273 2011/11/30 13:03:24 roberto Exp roberto $
** Basic library ** Basic library
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -293,6 +293,7 @@ static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
lua_pushvalue(L, 1); /* get function */ lua_pushvalue(L, 1); /* get function */
lua_call(L, 0, 1); /* call it */ lua_call(L, 0, 1); /* call it */
if (lua_isnil(L, -1)) { if (lua_isnil(L, -1)) {
lua_pop(L, 1); /* pop result */
*size = 0; *size = 0;
return NULL; return NULL;
} }