Utils/Parser Generator/SOURCE/yycsusiz.cpp

@@ -0,0 +1,65 @@
+/************************************************************
+yycsusiz.cpp
+This file can be freely modified for the generation of
+custom code.
+
+Copyright (c) 1999 Bumble-Bee Software Ltd.
+************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include "clex.h"
+
+#ifndef min
+#define min(x, y) ((x) <= (y) ? (x) : (y))
+#endif
+
+// the Visual C++ v1.52 compiler generates an error in NT if this isn't present!
+#ifdef _MSC_VER
+#if defined(M_I86HM) && defined(NDEBUG)
+#pragma function(memcpy)
+#endif
+#endif
+
+int yylexer::yysetunputsize(int size)
+{
+	yyassert(size >= 0);
+	if (yyunput_size != size) {
+		if (size < yyunputindex) {
+			return 0;
+		}
+
+		size_t unputbufcharsize = size * sizeof(int);
+		if ((int)(unputbufcharsize / sizeof(int)) != size) {
+			return 0;		// integer overflow
+		}
+
+		// allocate
+		int YYFAR* unputbufptr;
+		if (size <= yysunput_size) {
+			unputbufptr = yysunputbufptr;
+		}
+		else {
+			unputbufptr = (int YYFAR*)malloc(unputbufcharsize);
+			if (unputbufptr == NULL) {
+				return 0;
+			}
+		}
+
+		// copy
+		if (unputbufptr != yyunputbufptr) {
+			size_t charsize = yyunput_size * sizeof(int);
+			memcpy(unputbufptr, yyunputbufptr, min(unputbufcharsize, charsize));
+		}
+
+		// free
+		if (yyunputbufptr != yysunputbufptr) {
+			free(yyunputbufptr);
+		}
+
+		// assign
+		yyunputbufptr = unputbufptr;
+		yyunput_size = size;
+	}
+	return 1;
+}