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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/liblex/yyless.c – Rev 2

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#include	<u.h>
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#include	<libc.h>
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#include	<stdio.h>
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extern	char	yytext[];
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extern	int	yyleng;
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extern	int	yyprevious;
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void	yyunput(int c);
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void
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yyless(int x)
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{
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	char *lastch, *ptr;
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	lastch = yytext+yyleng;
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	if(x>=0 && x <= yyleng)
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		ptr = x + yytext;
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	else
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		ptr = (char*)x;
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	while(lastch > ptr)
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		yyunput(*--lastch);
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	*lastch = 0;
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	if (ptr >yytext)
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		yyprevious = lastch[-1];
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	yyleng = ptr-yytext;
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}