Utils/Parser Generator/SOURCE/yymsusiz.c

@@ -0,0 +1,64 @@
+/************************************************************
+yymsusiz.c
+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 "mlex.h"
+
+#ifdef YYPROTOTYPE
+int YYCDECL yymsetunputsize(yymlex_t YYFAR *yy, int size)
+#else
+int YYCDECL yymsetunputsize(yy, size)
+yymlex_t YYFAR *yy;
+int size;
+#endif
+{
+	yyassert(yy != NULL);
+	yyassert(size >= 0);
+	if (yy->yymunput_size != size) {
+		int YYFAR *unputbufptr;
+
+		size_t unputbufcharsize;
+
+		if (size < yy->yymunputindex) {
+			return 0;
+		}
+
+		unputbufcharsize = size * sizeof(int);
+		if ((int) (unputbufcharsize / sizeof(int)) != size) {
+			return 0;		/* integer overflow */
+		}
+
+		/* allocate */
+		if (size <= yy->yymsunput_size) {
+			unputbufptr = yy->yymsunputbufptr;
+		}
+		else {
+			unputbufptr = (int YYFAR *) malloc(unputbufcharsize);
+			if (unputbufptr == NULL) {
+				return 0;
+			}
+		}
+
+		/* copy */
+		if (unputbufptr != yy->yymunputbufptr) {
+			size_t charsize = yy->yymunput_size * sizeof(int);
+			memcpy(unputbufptr, yy->yymunputbufptr, min(unputbufcharsize, charsize));
+		}
+
+		/* free */
+		if (yy->yymunputbufptr != yy->yymsunputbufptr) {
+			free(yy->yymunputbufptr);
+		}
+
+		/* assign */
+		yy->yymunputbufptr = unputbufptr;
+		yy->yymunput_size = size;
+	}
+	return 1;
+}