bin/sh/arith_yylex.c

   1 /*-
   2  * Copyright (c) 2002
   3  *      Herbert Xu.
   4  * Copyright (c) 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Kenneth Almquist.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <inttypes.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include "shell.h"
  42 #include "arith_yacc.h"
  43 #include "expand.h"
  44 #include "error.h"
  45 #include "memalloc.h"
  46 #include "parser.h"
  47 #include "syntax.h"
  48
  49 #if ARITH_BOR + 11 != ARITH_BORASS || ARITH_ASS + 11 != ARITH_EQ
  50 #error Arithmetic tokens are out of order.
  51 #endif
  52
  53 int
  54 yylex(void)
  55 {
  56         int value;
  57         const char *buf = arith_buf;
  58         char *end;
  59         const char *p;
  60
  61         for (;;) {
  62                 value = *buf;
  63                 switch (value) {
  64                 case ' ':
  65                 case '\t':
  66                 case '\n':
  67                         buf++;
  68                         continue;
  69                 default:
  70                         return ARITH_BAD;
  71                 case '0':
  72                 case '1':
  73                 case '2':
  74                 case '3':
  75                 case '4':
  76                 case '5':
  77                 case '6':
  78                 case '7':
  79                 case '8':
  80                 case '9':
  81                         yylval.val = strtoarith_t(buf, &end, 0);
  82                         arith_buf = end;
  83                         return ARITH_NUM;
  84                 case 'A':
  85                 case 'B':
  86                 case 'C':
  87                 case 'D':
  88                 case 'E':
  89                 case 'F':
  90                 case 'G':
  91                 case 'H':
  92                 case 'I':
  93                 case 'J':
  94                 case 'K':
  95                 case 'L':
  96                 case 'M':
  97                 case 'N':
  98                 case 'O':
  99                 case 'P':
 100                 case 'Q':
 101                 case 'R':
 102                 case 'S':
 103                 case 'T':
 104                 case 'U':
 105                 case 'V':
 106                 case 'W':
 107                 case 'X':
 108                 case 'Y':
 109                 case 'Z':
 110                 case '_':
 111                 case 'a':
 112                 case 'b':
 113                 case 'c':
 114                 case 'd':
 115                 case 'e':
 116                 case 'f':
 117                 case 'g':
 118                 case 'h':
 119                 case 'i':
 120                 case 'j':
 121                 case 'k':
 122                 case 'l':
 123                 case 'm':
 124                 case 'n':
 125                 case 'o':
 126                 case 'p':
 127                 case 'q':
 128                 case 'r':
 129                 case 's':
 130                 case 't':
 131                 case 'u':
 132                 case 'v':
 133                 case 'w':
 134                 case 'x':
 135                 case 'y':
 136                 case 'z':
 137                         p = buf;
 138                         while (buf++, is_in_name(*buf))
 139                                 ;
 140                         yylval.name = stalloc(buf - p + 1);
 141                         memcpy(yylval.name, p, buf - p);
 142                         yylval.name[buf - p] = '\0';
 143                         value = ARITH_VAR;
 144                         goto out;
 145                 case '=':
 146                         value += ARITH_ASS - '=';
 147 checkeq:
 148                         buf++;
 149 checkeqcur:
 150                         if (*buf != '=')
 151                                 goto out;
 152                         value += 11;
 153                         break;
 154                 case '>':
 155                         switch (*++buf) {
 156                         case '=':
 157                                 value += ARITH_GE - '>';
 158                                 break;
 159                         case '>':
 160                                 value += ARITH_RSHIFT - '>';
 161                                 goto checkeq;
 162                         default:
 163                                 value += ARITH_GT - '>';
 164                                 goto out;
 165                         }
 166                         break;
 167                 case '<':
 168                         switch (*++buf) {
 169                         case '=':
 170                                 value += ARITH_LE - '<';
 171                                 break;
 172                         case '<':
 173                                 value += ARITH_LSHIFT - '<';
 174                                 goto checkeq;
 175                         default:
 176                                 value += ARITH_LT - '<';
 177                                 goto out;
 178                         }
 179                         break;
 180                 case '|':
 181                         if (*++buf != '|') {
 182                                 value += ARITH_BOR - '|';
 183                                 goto checkeqcur;
 184                         }
 185                         value += ARITH_OR - '|';
 186                         break;
 187                 case '&':
 188                         if (*++buf != '&') {
 189                                 value += ARITH_BAND - '&';
 190                                 goto checkeqcur;
 191                         }
 192                         value += ARITH_AND - '&';
 193                         break;
 194                 case '!':
 195                         if (*++buf != '=') {
 196                                 value += ARITH_NOT - '!';
 197                                 goto out;
 198                         }
 199                         value += ARITH_NE - '!';
 200                         break;
 201                 case 0:
 202                         goto out;
 203                 case '(':
 204                         value += ARITH_LPAREN - '(';
 205                         break;
 206                 case ')':
 207                         value += ARITH_RPAREN - ')';
 208                         break;
 209                 case '*':
 210                         value += ARITH_MUL - '*';
 211                         goto checkeq;
 212                 case '/':
 213                         value += ARITH_DIV - '/';
 214                         goto checkeq;
 215                 case '%':
 216                         value += ARITH_REM - '%';
 217                         goto checkeq;
 218                 case '+':
 219                         if (buf[1] == '+')
 220                                 return ARITH_BAD;
 221                         value += ARITH_ADD - '+';
 222                         goto checkeq;
 223                 case '-':
 224                         if (buf[1] == '-')
 225                                 return ARITH_BAD;
 226                         value += ARITH_SUB - '-';
 227                         goto checkeq;
 228                 case '~':
 229                         value += ARITH_BNOT - '~';
 230                         break;
 231                 case '^':
 232                         value += ARITH_BXOR - '^';
 233                         goto checkeq;
 234                 case '?':
 235                         value += ARITH_QMARK - '?';
 236                         break;
 237                 case ':':
 238                         value += ARITH_COLON - ':';
 239                         break;
 240                 }
 241                 break;
 242         }
 243
 244         buf++;
 245 out:
 246         arith_buf = buf;
 247         return value;
 248 }