Fix buffer overflow in parser

[xboard.git] / parser.c

diff --git a/parser.c b/parser.c
index 6da13d4..8b1dc3f 100644 (file)
--- a/parser.c
+++ b/parser.c
@@ -174,6 +174,10 @@ NextUnit (char **p)
            if(fromString) return 0; // we are parsing string, so the end is really the end
            *p = inPtr = inputBuf;
            if(!ReadLine()) return 0; // EOF
+       } else if(inPtr > inputBuf + PARSEBUFSIZE/2) { // buffer fills up with already parsed stuff
+           char *q = *p, *r = inputBuf;
+           while(*r++ = *q++);
+           *p = inputBuf; inPtr = r - 1;
        }
        parseStart = oldp = *p; // remember where we begin