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/* $Id$ */
/*-
* Copyright (c) 2002
* Herbert Xu.
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include "arith.h"
#include "expand.h"
#include "error.h"
extern int yylval;
extern const char *arith_buf, *arith_startbuf;
int
yylex()
{
int value;
const char *buf = arith_buf;
for (;;) {
switch (*buf) {
case ' ':
case '\t':
case '\n':
buf++;
continue;
default:
err:
error("arith: syntax error: \"%s\"", arith_startbuf);
/* NOTREACHED */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
yylval = strtoll(buf, (char **) &arith_buf, 0);
return ARITH_NUM;
case '=':
if (*++buf != '=') {
goto err;
}
value = ARITH_EQ;
break;
case '>':
switch (*++buf) {
case '=':
value = ARITH_GE;
break;
case '>':
value = ARITH_RSHIFT;
break;
default:
value = ARITH_GT;
goto out;
}
break;
case '<':
switch (*++buf) {
case '=':
value = ARITH_LE;
break;
case '<':
value = ARITH_LSHIFT;
break;
default:
value = ARITH_LT;
goto out;
}
break;
case '|':
if (*++buf != '|') {
value = ARITH_BOR;
goto out;
}
value = ARITH_OR;
break;
case '&':
if (*++buf != '&') {
value = ARITH_BAND;
goto out;
}
value = ARITH_AND;
break;
case '!':
if (*++buf != '=') {
value = ARITH_NOT;
goto out;
}
value = ARITH_NE;
break;
case 0:
value = 0;
goto out;
case '(':
value = ARITH_LPAREN;
break;
case ')':
value = ARITH_RPAREN;
break;
case '*':
value = ARITH_MUL;
break;
case '/':
value = ARITH_DIV;
break;
case '%':
value = ARITH_REM;
break;
case '+':
value = ARITH_ADD;
break;
case '-':
value = ARITH_SUB;
break;
case '~':
value = ARITH_BNOT;
break;
case '^':
value = ARITH_BXOR;
break;
}
break;
}
buf++;
out:
arith_buf = buf;
return value;
}
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