Utils/Parser Generator/SOURCE/yymstsiz.c

@@ -0,0 +1,84 @@
+/************************************************************
+yymstsiz.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 yymsettextsize(yymlex_t YYFAR *yy, int size)
+#else
+int YYCDECL yymsettextsize(yy, size)
+yymlex_t YYFAR *yy;
+int size;
+#endif
+{
+	yyassert(yy != NULL);
+	yyassert(size >= 0);
+	if (yy->yymtext_size != size) {
+		char YYFAR *text;
+		int YYFAR *statebuf;
+
+		size_t textcharsize;
+		size_t statebufcharsize;
+
+		if (size < yy->yymleng) {
+			return 0;
+		}
+
+		textcharsize = size + 1;	/* include the '\0' */
+		if (textcharsize <= (size_t) size) {
+			return 0;		/* integer overflow */
+		}
+		statebufcharsize = size * sizeof(int);
+		if ((int) (statebufcharsize / sizeof(int)) != size) {
+			return 0;		/* integer overflow */
+		}
+
+		/* allocate */
+		if (size <= yy->yymstext_size) {
+			text = yy->yymstext;
+			statebuf = yy->yymsstatebuf;
+		}
+		else {
+			text = (char YYFAR *) malloc(textcharsize);
+			if (text == NULL) {
+				return 0;
+			}
+			statebuf = (int YYFAR *) malloc(statebufcharsize);
+			if (statebuf == NULL) {
+				free(text);			/* clean up */
+				return 0;
+			}
+		}
+
+		/* copy */
+		if (text != yy->yymtext) {
+			size_t charsize = yy->yymtext_size + 1;
+			memcpy(text, yy->yymtext, min(textcharsize, charsize));
+		}
+		if (statebuf != yy->yymstatebuf) {
+			size_t charsize = yy->yymtext_size * sizeof(int);
+			memcpy(statebuf, yy->yymstatebuf, min(statebufcharsize, charsize));
+		}
+
+		/* free */
+		if (yy->yymtext != yy->yymstext) {
+			free(yy->yymtext);
+		}
+		if (yy->yymstatebuf != yy->yymsstatebuf) {
+			free(yy->yymstatebuf);
+		}
+
+		/* assign */
+		yy->yymtext = text;
+		yy->yymstatebuf = statebuf;
+		yy->yymtext_size = size;
+	}
+	return 1;
+}