Import sources from 2011-03-30 iso image

1 files changed, 58 insertions, 0 deletions

diff --git a/sys/src/liblex/reject.c b/sys/src/liblex/reject.c
new file mode 100755
index 000000000..24e8bee1f
--- /dev/null
+++ b/sys/src/liblex/reject.c
@@ -0,0 +1,58 @@
+#include	<u.h>
+#include	<libc.h>
+#include	<stdio.h>
+
+extern	FILE*	yyout;
+extern	FILE*	yyin;
+extern	int	yyprevious, *yyfnd;
+extern	char	yyextra[];
+extern	char	yytext[];
+extern	int	yyleng;
+
+extern
+struct
+{
+	int *yyaa, *yybb;
+	int *yystops;
+} *yylstate [], **yylsp, **yyolsp;
+
+int	yyback(int *p, int m);
+int	yyinput(void);
+void	yyoutput(int c);
+void	yyunput(int c);
+
+int
+yyracc(int m)
+{
+
+	yyolsp = yylsp;
+	if(yyextra[m]) {
+		while(yyback((*yylsp)->yystops, -m) != 1 && yylsp > yylstate) {
+			yylsp--;
+			yyunput(yytext[--yyleng]);
+		}
+	}
+	yyprevious = yytext[yyleng-1];
+	yytext[yyleng] = 0;
+	return m;
+}
+
+int
+yyreject(void)
+{
+	for(; yylsp < yyolsp; yylsp++)
+		yytext[yyleng++] = yyinput();
+	if(*yyfnd > 0)
+		return yyracc(*yyfnd++);
+	while(yylsp-- > yylstate) {
+		yyunput(yytext[yyleng-1]);
+		yytext[--yyleng] = 0;
+		if(*yylsp != 0 && (yyfnd = (*yylsp)->yystops) && *yyfnd > 0)
+			return yyracc(*yyfnd++);
+	}
+	if(yytext[0] == 0)
+		return 0;
+	yyoutput(yyprevious = yyinput());
+	yyleng = 0;
+	return -1;
+}