247 lines
4.9 KiB
C
247 lines
4.9 KiB
C
/*-
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* Copyright (c) 2002
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* Herbert Xu.
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <inttypes.h>
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#include <stdlib.h>
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#include <string.h>
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#include "shell.h"
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#include "arith_yacc.h"
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#include "expand.h"
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#include "error.h"
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#include "memalloc.h"
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#include "parser.h"
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#include "syntax.h"
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#if ARITH_BOR + 11 != ARITH_BORASS || ARITH_ASS + 11 != ARITH_EQ
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#error Arithmetic tokens are out of order.
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#endif
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extern const char *arith_buf;
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int
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yylex()
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{
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int value;
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const char *buf = arith_buf;
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char *end;
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const char *p;
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for (;;) {
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value = *buf;
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switch (value) {
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case ' ':
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case '\t':
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case '\n':
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buf++;
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continue;
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default:
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return ARITH_BAD;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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yylval.val = strtoarith_t(buf, (char **)&end, 0);
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arith_buf = end;
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return ARITH_NUM;
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case 'A':
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case 'B':
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case 'C':
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case 'D':
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case 'E':
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case 'F':
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case 'G':
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case 'H':
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case 'I':
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case 'J':
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case 'K':
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case 'L':
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case 'M':
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case 'N':
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case 'O':
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case 'P':
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case 'Q':
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case 'R':
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case 'S':
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case 'T':
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case 'U':
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case 'V':
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case 'W':
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case 'X':
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case 'Y':
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case 'Z':
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case '_':
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case 'a':
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case 'b':
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case 'c':
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case 'd':
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case 'e':
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case 'f':
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case 'g':
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case 'h':
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case 'i':
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case 'j':
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case 'k':
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case 'l':
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case 'm':
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case 'n':
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case 'o':
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case 'p':
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case 'q':
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case 'r':
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case 's':
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case 't':
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case 'u':
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case 'v':
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case 'w':
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case 'x':
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case 'y':
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case 'z':
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p = buf;
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while (buf++, is_in_name(*buf))
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;
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yylval.name = stalloc(buf - p + 1);
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memcpy(yylval.name, p, buf - p);
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yylval.name[buf - p] = '\0';
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value = ARITH_VAR;
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goto out;
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case '=':
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value += ARITH_ASS - '=';
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checkeq:
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buf++;
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checkeqcur:
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if (*buf != '=')
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goto out;
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value += 11;
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break;
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case '>':
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switch (*++buf) {
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case '=':
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value += ARITH_GE - '>';
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break;
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case '>':
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value += ARITH_RSHIFT - '>';
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goto checkeq;
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default:
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value += ARITH_GT - '>';
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goto out;
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}
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break;
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case '<':
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switch (*++buf) {
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case '=':
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value += ARITH_LE - '<';
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break;
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case '<':
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value += ARITH_LSHIFT - '<';
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goto checkeq;
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default:
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value += ARITH_LT - '<';
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goto out;
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}
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break;
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case '|':
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if (*++buf != '|') {
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value += ARITH_BOR - '|';
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goto checkeqcur;
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}
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value += ARITH_OR - '|';
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break;
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case '&':
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if (*++buf != '&') {
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value += ARITH_BAND - '&';
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goto checkeqcur;
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}
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value += ARITH_AND - '&';
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break;
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case '!':
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if (*++buf != '=') {
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value += ARITH_NOT - '!';
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goto out;
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}
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value += ARITH_NE - '!';
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break;
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case 0:
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goto out;
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case '(':
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value += ARITH_LPAREN - '(';
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break;
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case ')':
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value += ARITH_RPAREN - ')';
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break;
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case '*':
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value += ARITH_MUL - '*';
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goto checkeq;
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case '/':
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value += ARITH_DIV - '/';
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goto checkeq;
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case '%':
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value += ARITH_REM - '%';
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goto checkeq;
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case '+':
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value += ARITH_ADD - '+';
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goto checkeq;
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case '-':
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value += ARITH_SUB - '-';
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goto checkeq;
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case '~':
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value += ARITH_BNOT - '~';
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break;
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case '^':
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value += ARITH_BXOR - '^';
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goto checkeq;
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case '?':
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value += ARITH_QMARK - '?';
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break;
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case ':':
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value += ARITH_COLON - ':';
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break;
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}
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break;
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}
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buf++;
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out:
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arith_buf = buf;
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return value;
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}
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