Utils/Parser Generator/SOURCE/yysunput.c

@@ -0,0 +1,64 @@
+/************************************************************
+yysunput.c
+This file can be freely modified for the generation of
+custom code.
+
+Copyright (c) 1999 Bumble-Bee Software Ltd.
+************************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <limits.h>
+#include "lex.h"
+
+#ifdef YYPROTOTYPE
+void YYCDECL yyunput(int ch)
+#else
+void YYCDECL yyunput(ch)
+int ch;
+#endif
+{
+	yyassert(ch >= 0 && ch <= UCHAR_MAX || ch == EOF);
+	yyassert(yyunputindex >= 0 && yyunputindex <= yyunput_size);
+	
+	/* check unput buffer size */
+	if (yyunputindex == yyunput_size) {
+		do {
+			if (yyunputgrow) {
+				if (yyunput_size != 0) {
+					int size = yyunput_size * 2;
+					if (size / 2 == yyunput_size) {		/* overflow check */
+						if (yysetunputsize(size)) {
+							break;
+						}
+					}
+				}
+				else {
+					if (yysetunputsize(100)) {
+						break;
+					}
+				}
+			}
+			yyunputoverflow();
+			exit(EXIT_FAILURE);
+		}
+		while (0);
+	}
+
+	yyunputbufptr[yyunputindex++] = ch;
+
+	/* check line number */
+	if (ch == '\n') {
+		yylineno--;
+	}
+
+	/* debugging */
+#ifdef YYDEBUG
+	if (yydebug || yylexdebug) {
+		yylexdebugoutput("unput: \'");
+		yydebugoutput(ch);
+		yylexdebugoutput("\'\n");
+	}
+#endif
+}