2.9BSD/usr/src/cmd/lex/lib/reject.c

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# include <stdio.h>
extern struct {int *yyaa, *yybb; int *yystops;} *yylstate [], **yylsp, **yyolsp;
yyreject ()
{
extern FILE *yyout, *yyin;
extern int yyprevious , *yyfnd;
extern char yyextra[];
extern char yytext[];
extern int yyleng;
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);
}
yyracc(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);
}