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(svn r19569) -Fix: possible buffer underflow in newgrf string code

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yexo
2010-04-06 21:16:36 +00:00
parent b48e490c7c
commit 043ff01b4a
3 changed files with 5 additions and 4 deletions
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4
src/newgrf_text.cpp
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@@ -636,7 +636,7 @@ void RewindTextRefStack()
* @param argv the OpenTTD stack of values
* @return the string control code to "execute" now
*/
uint RemapNewGRFStringControlCode(uint scc, char **buff, const char **str, int64 *argv)
uint RemapNewGRFStringControlCode(uint scc, char *buf_start, char **buff, const char **str, int64 *argv)
{
if (_newgrf_textrefstack->used) {
switch (scc) {
@@ -663,7 +663,7 @@ uint RemapNewGRFStringControlCode(uint scc, char **buff, const char **str, int64
case SCC_NEWGRF_ROTATE_TOP_4_WORDS: _newgrf_textrefstack->RotateTop4Words(); break;
case SCC_NEWGRF_PUSH_WORD: _newgrf_textrefstack->PushWord(Utf8Consume(str)); break;
case SCC_NEWGRF_UNPRINT: *buff -= Utf8Consume(str); break;
case SCC_NEWGRF_UNPRINT: *buff = max(*buff - Utf8Consume(str), buf_start); break;
case SCC_NEWGRF_PRINT_STRING_ID:
*argv = TTDPStringIDToOTTDStringIDMapping(_newgrf_textrefstack->PopUnsignedWord());