1 #ifndef __eval_expr_h__ 2 #define __eval_expr_h__ 3 /*- 4 * Copyright (c) 2015 Netflix Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 __FBSDID("$FreeBSD$"); 31 32 enum exptype { 33 TYPE_OP_PLUS, 34 TYPE_OP_MINUS, 35 TYPE_OP_MULT, 36 TYPE_OP_DIVIDE, 37 TYPE_PARN_OPEN, 38 TYPE_PARN_CLOSE, 39 TYPE_VALUE_CON, 40 TYPE_VALUE_PMC 41 }; 42 43 #define STATE_UNSET 0 /* We have no setting yet in value */ 44 #define STATE_FILLED 1 /* We have filled in value */ 45 46 struct expression { 47 struct expression *next; /* Next in expression. */ 48 struct expression *prev; /* Prev in expression. */ 49 double value; /* If there is a value to set */ 50 enum exptype type; /* What is it */ 51 uint8_t state; /* Current state if value type */ 52 char name[252]; /* If a PMC whats the name, con value*/ 53 }; 54 55 struct expression *parse_expression(char *str); 56 double run_expr(struct expression *exp, int initial_call, struct expression **lastone); 57 void print_exp(struct expression *exp); 58 #endif 59