20 lines
368 B
C
20 lines
368 B
C
yyless(x)
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{
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extern char yytext[];
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register char *lastch, *ptr;
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extern int yyleng;
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extern int yyprevious;
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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 = 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;
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yyleng = ptr-yytext;
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}
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