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yacc
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yyless.c
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C/C++ Source or Header
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1980-01-03
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970b
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38 lines
/*
HEADER: CUG nnn.nn;
TITLE: YACC - Yet Another Compilier-Compilier
VERSION: 1.0 for IBM-PC
DATE: JAN 28, 1985
DESCRIPTION: LALR(1) Parser Generator. From UNIX
KEYWORDS: Parser Generator Compilier-Compilier YACC
SYSTEM: IBM-PC and Compatiables
FILENAME: YYLESS.C
WARNINGS: This program is not for the casual user. It will
be useful primarily to expert developers.
CRC: N/A
SEE-ALSO: LEX and PREP
AUTHORS: Scott Guthery 11100 leafwood lane Austin, TX 78750
COMPILERS: DESMET-C
REFERENCES: UNIX Systems Manuals
*/
yyless(x)
{
extern char yytext[];
register char *lastch, *ptr;
extern int yyleng;
extern int yyprevious;
lastch = yytext+yyleng;
if (x>=0 && x <= yyleng)
ptr = x + yytext;
else
ptr = x;
while (lastch > ptr)
yyunput(*--lastch);
*lastch = 0;
if (ptr >yytext)
yyprevious = *--lastch;
yyleng = ptr-yytext;
}