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