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arith_yylex.c

/*    $Id: arith_yylex.c 1.5 03/09/26 11:37:09-00:00 herbert@ $   */

/*-
 * 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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