Import sources from 2011-03-30 iso image

1 files changed, 27 insertions, 0 deletions

diff --git a/sys/src/liblex/yyless.c b/sys/src/liblex/yyless.c
new file mode 100755
index 000000000..6ee8a6176
--- /dev/null
+++ b/sys/src/liblex/yyless.c
@@ -0,0 +1,27 @@
+#include	<u.h>
+#include	<libc.h>
+#include	<stdio.h>
+
+extern	char	yytext[];
+extern	int	yyleng;
+extern	int	yyprevious;
+
+void	yyunput(int c);
+
+void
+yyless(int x)
+{
+	char *lastch, *ptr;
+
+	lastch = yytext+yyleng;
+	if(x>=0 && x <= yyleng)
+		ptr = x + yytext;
+	else
+		ptr = (char*)x;
+	while(lastch > ptr)
+		yyunput(*--lastch);
+	*lastch = 0;
+	if (ptr >yytext)
+		yyprevious = lastch[-1];
+	yyleng = ptr-yytext;
+}