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-rw-r--r--usr/dash/arith_yylex.c240
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+/*-
+ * 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 <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include "arith_yacc.h"
+#include "expand.h"
+#include "error.h"
+#include "shell.h"
+#include "memalloc.h"
+#include "syntax.h"
+#include "system.h"
+
+#if ARITH_BOR + 11 != ARITH_BORASS || ARITH_ASS + 11 != ARITH_EQ
+#error Arithmetic tokens are out of order.
+#endif
+
+extern const char *arith_buf;
+
+int
+yylex()
+{
+ int value;
+ const char *buf = arith_buf;
+ const char *p;
+
+ for (;;) {
+ value = *buf;
+ switch (value) {
+ case ' ':
+ case '\t':
+ case '\n':
+ buf++;
+ continue;
+ default:
+ return ARITH_BAD;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ yylval.val = strtoimax(buf, (char **)&arith_buf, 0);
+ return ARITH_NUM;
+ case 'A':
+ case 'B':
+ case 'C':
+ case 'D':
+ case 'E':
+ case 'F':
+ case 'G':
+ case 'H':
+ case 'I':
+ case 'J':
+ case 'K':
+ case 'L':
+ case 'M':
+ case 'N':
+ case 'O':
+ case 'P':
+ case 'Q':
+ case 'R':
+ case 'S':
+ case 'T':
+ case 'U':
+ case 'V':
+ case 'W':
+ case 'X':
+ case 'Y':
+ case 'Z':
+ case '_':
+ case 'a':
+ case 'b':
+ case 'c':
+ case 'd':
+ case 'e':
+ case 'f':
+ case 'g':
+ case 'h':
+ case 'i':
+ case 'j':
+ case 'k':
+ case 'l':
+ case 'm':
+ case 'n':
+ case 'o':
+ case 'p':
+ case 'q':
+ case 'r':
+ case 's':
+ case 't':
+ case 'u':
+ case 'v':
+ case 'w':
+ case 'x':
+ case 'y':
+ case 'z':
+ p = buf;
+ while (buf++, is_in_name(*buf))
+ ;
+ yylval.name = stalloc(buf - p + 1);
+ *(char *)mempcpy(yylval.name, p, buf - p) = 0;
+ value = ARITH_VAR;
+ goto out;
+ case '=':
+ value += ARITH_ASS - '=';
+checkeq:
+ buf++;
+checkeqcur:
+ if (*buf != '=')
+ goto out;
+ value += 11;
+ break;
+ case '>':
+ switch (*++buf) {
+ case '=':
+ value += ARITH_GE - '>';
+ break;
+ case '>':
+ value += ARITH_RSHIFT - '>';
+ goto checkeq;
+ default:
+ value += ARITH_GT - '>';
+ goto out;
+ }
+ break;
+ case '<':
+ switch (*++buf) {
+ case '=':
+ value += ARITH_LE - '<';
+ break;
+ case '<':
+ value += ARITH_LSHIFT - '<';
+ goto checkeq;
+ default:
+ value += ARITH_LT - '<';
+ goto out;
+ }
+ break;
+ case '|':
+ if (*++buf != '|') {
+ value += ARITH_BOR - '|';
+ goto checkeqcur;
+ }
+ value += ARITH_OR - '|';
+ break;
+ case '&':
+ if (*++buf != '&') {
+ value += ARITH_BAND - '&';
+ goto checkeqcur;
+ }
+ value += ARITH_AND - '&';
+ break;
+ case '!':
+ if (*++buf != '=') {
+ value += ARITH_NOT - '!';
+ goto out;
+ }
+ value += ARITH_NE - '!';
+ break;
+ case 0:
+ goto out;
+ case '(':
+ value += ARITH_LPAREN - '(';
+ break;
+ case ')':
+ value += ARITH_RPAREN - ')';
+ break;
+ case '*':
+ value += ARITH_MUL - '*';
+ goto checkeq;
+ case '/':
+ value += ARITH_DIV - '/';
+ goto checkeq;
+ case '%':
+ value += ARITH_REM - '%';
+ goto checkeq;
+ case '+':
+ value += ARITH_ADD - '+';
+ goto checkeq;
+ case '-':
+ value += ARITH_SUB - '-';
+ goto checkeq;
+ case '~':
+ value += ARITH_BNOT - '~';
+ break;
+ case '^':
+ value += ARITH_BXOR - '^';
+ goto checkeq;
+ case '?':
+ value += ARITH_QMARK - '?';
+ break;
+ case ':':
+ value += ARITH_COLON - ':';
+ break;
+ }
+ break;
+ }
+
+ buf++;
+out:
+ arith_buf = buf;
+ return value;
+}