[1895] | 1 | /* parser config.in |
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[5814] | 2 | * $Id: tkcond.c 2281 2010-10-15 14:21:13Z smasson $ |
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[1895] | 3 | * |
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| 4 | * This software is governed by the CeCILL license |
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| 5 | * See IOIPSL/IOIPSL_License_CeCILL.txt |
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| 6 | * |
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| 7 | * Version 1.0 |
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| 8 | * Eric Youngdale |
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| 9 | * 10/95 |
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| 10 | * |
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| 11 | * The general idea here is that we want to parse a config.in file and |
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| 12 | * from this, we generate a wish script which gives us effectively the |
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| 13 | * same functionality that the original config.in script provided. |
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| 14 | * |
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| 15 | * This task is split roughly into 3 parts. The first parse is the parse |
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| 16 | * of the input file itself. The second part is where we analyze the |
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| 17 | * #ifdef clauses, and attach a linked list of tokens to each of the |
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| 18 | * menu items. In this way, each menu item has a complete list of |
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| 19 | * dependencies that are used to enable/disable the options. |
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| 20 | * The third part is to take the configuration database we have build, |
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| 21 | * and build the actual wish script. |
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| 22 | * |
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| 23 | * This file contains the code to further process the conditions from |
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| 24 | * the "ifdef" clauses. |
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| 25 | * |
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| 26 | * The conditions are assumed to be one of the following formats |
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| 27 | * |
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| 28 | * simple_condition:= "$VARIABLE" == y/n/m |
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| 29 | * simple_condition:= "$VARIABLE != y/n/m |
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| 30 | * |
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| 31 | * simple_condition -a simple_condition |
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| 32 | * |
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| 33 | * If the input condition contains '(' or ')' it would screw us up, but for now |
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| 34 | * this is not a problem. |
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| 35 | */ |
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| 36 | #include <stdlib.h> |
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| 37 | #include <stdio.h> |
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| 38 | #include <string.h> |
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| 39 | #include "tkparse.h" |
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| 40 | |
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| 41 | |
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| 42 | /* |
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| 43 | * Walk a condition chain and invert it so that the logical result is |
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| 44 | * inverted. |
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| 45 | */ |
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| 46 | static void invert_condition(struct condition * cnd) |
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| 47 | { |
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| 48 | /* |
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| 49 | * This is simple. Just walk through the list, and invert |
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| 50 | * all of the operators. |
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| 51 | */ |
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| 52 | for(;cnd; cnd = cnd->next) |
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| 53 | { |
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| 54 | switch(cnd->op) |
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| 55 | { |
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| 56 | case op_and: |
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| 57 | cnd->op = op_or; |
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| 58 | break; |
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| 59 | case op_or: |
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| 60 | /* |
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| 61 | * This is not turned into op_and - we need to keep track |
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| 62 | * of what operators were used here since we have an optimization |
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| 63 | * later on to remove duplicate conditions, and having |
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| 64 | * inverted ors in there would make it harder if we did not |
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| 65 | * distinguish an inverted or from an and we inserted because |
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| 66 | * of nested ifs. |
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| 67 | */ |
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| 68 | cnd->op = op_and1; |
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| 69 | break; |
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| 70 | case op_neq: |
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| 71 | cnd->op = op_eq; |
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| 72 | break; |
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| 73 | case op_eq: |
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| 74 | cnd->op = op_neq; |
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| 75 | break; |
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| 76 | default: |
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| 77 | break; |
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| 78 | } |
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| 79 | } |
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| 80 | } |
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| 81 | |
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| 82 | /* |
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| 83 | * Walk a condition chain, and free the memory associated with it. |
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| 84 | */ |
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| 85 | static void free_condition(struct condition * cnd) |
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| 86 | { |
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| 87 | struct condition * next; |
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| 88 | for(;cnd; cnd = next) |
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| 89 | { |
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| 90 | next = cnd->next; |
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| 91 | |
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| 92 | if( cnd->variable.str != NULL ) |
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| 93 | free(cnd->variable.str); |
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| 94 | |
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| 95 | free(cnd); |
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| 96 | } |
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| 97 | } |
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| 98 | |
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| 99 | /* |
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| 100 | * Walk all of the conditions, and look for choice values. Convert |
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| 101 | * the tokens into something more digestible. |
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| 102 | */ |
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| 103 | void fix_choice_cond() |
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| 104 | { |
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| 105 | struct condition * cond; |
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| 106 | struct condition * cond2; |
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| 107 | struct kconfig * cfg; |
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| 108 | char tmpbuf[10]; |
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| 109 | |
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| 110 | for(cfg = config;cfg != NULL; cfg = cfg->next) |
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| 111 | { |
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| 112 | if( cfg->cond == NULL ) |
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| 113 | { |
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| 114 | continue; |
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| 115 | } |
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| 116 | |
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| 117 | for(cond = cfg->cond; cond != NULL; cond = cond->next) |
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| 118 | { |
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| 119 | if( cond->op != op_kvariable ) |
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| 120 | continue; |
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| 121 | |
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| 122 | if( cond->variable.cfg->tok != tok_choice ) |
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| 123 | continue; |
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| 124 | |
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| 125 | /* |
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| 126 | * Look ahead for what we are comparing this to. There should |
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| 127 | * be one operator in between. |
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| 128 | */ |
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| 129 | cond2 = cond->next->next; |
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| 130 | strcpy(tmpbuf, cond->variable.cfg->label); |
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| 131 | |
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| 132 | if( strcmp(cond2->variable.str, "y") == 0 ) |
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| 133 | { |
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| 134 | cond->variable.cfg = cond->variable.cfg->choice_label; |
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| 135 | cond2->variable.str = strdup(tmpbuf); |
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| 136 | } |
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| 137 | else |
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| 138 | { |
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| 139 | fprintf(stderr,"Ooops\n"); |
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| 140 | exit(0); |
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| 141 | } |
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| 142 | } |
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| 143 | |
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| 144 | } |
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| 145 | } |
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| 146 | |
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| 147 | /* |
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| 148 | * Walk the stack of conditions, and clone all of them with "&&" operators |
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| 149 | * gluing them together. The conditions from each level of the stack |
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| 150 | * are wrapped in parenthesis so as to guarantee that the results |
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| 151 | * are logically correct. |
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| 152 | */ |
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| 153 | struct condition * get_token_cond(struct condition ** cond, int depth) |
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| 154 | { |
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| 155 | int i; |
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| 156 | struct condition * newcond; |
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| 157 | struct condition * tail; |
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| 158 | struct condition * new; |
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| 159 | struct condition * ocond; |
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| 160 | struct kconfig * cfg; |
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| 161 | |
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| 162 | newcond = tail = NULL; |
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| 163 | for(i=0; i<depth; i++, cond++) |
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| 164 | { |
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| 165 | /* |
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| 166 | * First insert the left parenthesis |
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| 167 | */ |
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| 168 | new = (struct condition *) malloc(sizeof(struct condition)); |
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| 169 | memset(new, 0, sizeof(*new)); |
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| 170 | new->op = op_lparen; |
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| 171 | if( tail == NULL ) |
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| 172 | { |
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| 173 | newcond = tail = new; |
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| 174 | } |
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| 175 | else |
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| 176 | { |
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| 177 | tail->next = new; |
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| 178 | tail = new; |
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| 179 | } |
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| 180 | |
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| 181 | /* |
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| 182 | * Now duplicate the chain. |
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| 183 | */ |
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| 184 | ocond = *cond; |
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| 185 | for(;ocond != NULL; ocond = ocond->next) |
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| 186 | { |
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| 187 | new = (struct condition *) malloc(sizeof(struct condition)); |
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| 188 | memset(new, 0, sizeof(*new)); |
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| 189 | new->op = ocond->op; |
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| 190 | if( ocond->variable.str != NULL ) |
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| 191 | { |
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| 192 | if( ocond->op == op_variable ) |
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| 193 | { |
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| 194 | /* |
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| 195 | * Search for structure to insert here. |
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| 196 | */ |
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| 197 | for(cfg = config;cfg != NULL; cfg = cfg->next) |
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| 198 | { |
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| 199 | if( cfg->tok != tok_bool |
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| 200 | && cfg->tok != tok_int |
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| 201 | && cfg->tok != tok_hex |
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| 202 | && cfg->tok != tok_tristate |
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| 203 | && cfg->tok != tok_choice |
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| 204 | && cfg->tok != tok_dep_tristate) |
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| 205 | { |
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| 206 | continue; |
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| 207 | } |
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| 208 | if( strcmp(cfg->optionname, ocond->variable.str) == 0) |
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| 209 | { |
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| 210 | new->variable.cfg = cfg; |
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| 211 | new->op = op_kvariable; |
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| 212 | break; |
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| 213 | } |
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| 214 | } |
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| 215 | if( cfg == NULL ) |
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| 216 | { |
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| 217 | new->variable.str = strdup(ocond->variable.str); |
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| 218 | } |
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| 219 | } |
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| 220 | else |
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| 221 | { |
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| 222 | new->variable.str = strdup(ocond->variable.str); |
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| 223 | } |
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| 224 | } |
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| 225 | tail->next = new; |
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| 226 | tail = new; |
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| 227 | } |
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| 228 | |
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| 229 | /* |
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| 230 | * Next insert the left parenthesis |
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| 231 | */ |
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| 232 | new = (struct condition *) malloc(sizeof(struct condition)); |
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| 233 | memset(new, 0, sizeof(*new)); |
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| 234 | new->op = op_rparen; |
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| 235 | tail->next = new; |
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| 236 | tail = new; |
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| 237 | |
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| 238 | /* |
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| 239 | * Insert an and operator, if we have another condition. |
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| 240 | */ |
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| 241 | if( i < depth - 1 ) |
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| 242 | { |
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| 243 | new = (struct condition *) malloc(sizeof(struct condition)); |
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| 244 | memset(new, 0, sizeof(*new)); |
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| 245 | new->op = op_and; |
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| 246 | tail->next = new; |
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| 247 | tail = new; |
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| 248 | } |
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| 249 | |
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| 250 | } |
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| 251 | |
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| 252 | return newcond; |
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| 253 | } |
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| 254 | |
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| 255 | /* |
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| 256 | * Walk a single chain of conditions and clone it. These are assumed |
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| 257 | * to be created/processed by get_token_cond in a previous pass. |
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| 258 | */ |
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| 259 | struct condition * get_token_cond_frag(struct condition * cond, |
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| 260 | struct condition ** last) |
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| 261 | { |
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| 262 | struct condition * newcond; |
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| 263 | struct condition * tail; |
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| 264 | struct condition * new; |
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| 265 | struct condition * ocond; |
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| 266 | |
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| 267 | newcond = tail = NULL; |
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| 268 | |
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| 269 | /* |
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| 270 | * Now duplicate the chain. |
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| 271 | */ |
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| 272 | for(ocond = cond;ocond != NULL; ocond = ocond->next) |
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| 273 | { |
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| 274 | new = (struct condition *) malloc(sizeof(struct condition)); |
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| 275 | memset(new, 0, sizeof(*new)); |
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| 276 | new->op = ocond->op; |
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| 277 | new->variable.cfg = ocond->variable.cfg; |
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| 278 | if( tail == NULL ) |
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| 279 | { |
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| 280 | newcond = tail = new; |
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| 281 | } |
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| 282 | else |
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| 283 | { |
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| 284 | tail->next = new; |
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| 285 | tail = new; |
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| 286 | } |
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| 287 | } |
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| 288 | |
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| 289 | new = (struct condition *) malloc(sizeof(struct condition)); |
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| 290 | memset(new, 0, sizeof(*new)); |
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| 291 | new->op = op_and; |
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| 292 | tail->next = new; |
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| 293 | tail = new; |
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| 294 | |
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| 295 | *last = tail; |
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| 296 | return newcond; |
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| 297 | } |
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| 298 | |
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| 299 | /* |
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| 300 | * Walk through the if conditionals and maintain a chain. |
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| 301 | */ |
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| 302 | void fix_conditionals(struct kconfig * scfg) |
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| 303 | { |
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| 304 | int depth = 0; |
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| 305 | int i; |
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| 306 | struct kconfig * cfg; |
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| 307 | struct kconfig * cfg1; |
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| 308 | struct condition * conditions[25]; |
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| 309 | struct condition * cnd; |
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| 310 | struct condition * cnd1; |
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| 311 | struct condition * cnd2; |
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| 312 | struct condition * cnd3; |
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| 313 | struct condition * newcond; |
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| 314 | struct condition * last; |
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| 315 | |
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| 316 | /* |
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| 317 | * Start by walking the chain. Every time we see an ifdef, push |
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| 318 | * the condition chain on the stack. When we see an "else", we invert |
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| 319 | * the condition at the top of the stack, and when we see an "endif" |
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| 320 | * we free all of the memory for the condition at the top of the stack |
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| 321 | * and remove the condition from the top of the stack. |
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| 322 | * |
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| 323 | * For any other type of token (i.e. a bool), we clone a new condition chain |
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| 324 | * by anding together all of the conditions that are currently stored on |
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| 325 | * the stack. In this way, we have a correct representation of whatever |
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| 326 | * conditions govern the usage of each option. |
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| 327 | */ |
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| 328 | memset(conditions, 0, sizeof(conditions)); |
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| 329 | for(cfg=scfg;cfg != NULL; cfg = cfg->next) |
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| 330 | { |
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| 331 | switch(cfg->tok) |
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| 332 | { |
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| 333 | case tok_if: |
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| 334 | /* |
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| 335 | * Push this condition on the stack, and nuke the token |
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| 336 | * representing the ifdef, since we no longer need it. |
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| 337 | */ |
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| 338 | conditions[depth] = cfg->cond; |
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| 339 | depth++; |
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| 340 | cfg->tok = tok_nop; |
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| 341 | cfg->cond = NULL; |
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| 342 | break; |
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| 343 | case tok_else: |
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| 344 | /* |
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| 345 | * For an else, we just invert the condition at the top of |
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| 346 | * the stack. This is done in place with no reallocation |
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| 347 | * of memory taking place. |
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| 348 | */ |
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| 349 | invert_condition(conditions[depth-1]); |
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| 350 | cfg->tok = tok_nop; |
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| 351 | break; |
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| 352 | case tok_fi: |
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| 353 | depth--; |
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| 354 | free_condition(conditions[depth]); |
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| 355 | conditions[depth] = NULL; |
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| 356 | cfg->tok = tok_nop; |
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| 357 | break; |
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| 358 | case tok_comment: |
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| 359 | case tok_define: |
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| 360 | case tok_menuoption: |
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| 361 | case tok_bool: |
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| 362 | case tok_tristate: |
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| 363 | case tok_int: |
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| 364 | case tok_hex: |
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| 365 | case tok_choice: |
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| 366 | case tok_make: |
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| 367 | /* |
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| 368 | * We need to duplicate the chain of conditions and attach them to |
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| 369 | * this token. |
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| 370 | */ |
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| 371 | cfg->cond = get_token_cond(&conditions[0], depth); |
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| 372 | break; |
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| 373 | case tok_dep_tristate: |
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| 374 | /* |
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| 375 | * Same as tok_tristate et al except we have a temporary |
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| 376 | * conditional. (Sort of a hybrid tok_if, tok_tristate, tok_fi |
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| 377 | * option) |
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| 378 | */ |
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| 379 | conditions[depth] = cfg->cond; |
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| 380 | depth++; |
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| 381 | cfg->cond = get_token_cond(&conditions[0], depth); |
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| 382 | depth--; |
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| 383 | free_condition(conditions[depth]); |
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| 384 | conditions[depth] = NULL; |
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| 385 | default: |
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| 386 | break; |
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| 387 | } |
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| 388 | } |
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| 389 | |
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| 390 | /* |
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| 391 | * Fix any conditions involving the "choice" operator. |
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| 392 | */ |
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| 393 | fix_choice_cond(); |
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| 394 | |
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| 395 | /* |
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| 396 | * Walk through and see if there are multiple options that control the |
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| 397 | * same kvariable. If there are we need to treat them a little bit |
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| 398 | * special. |
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| 399 | */ |
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| 400 | for(cfg=scfg;cfg != NULL; cfg = cfg->next) |
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| 401 | { |
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| 402 | switch(cfg->tok) |
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| 403 | { |
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| 404 | case tok_bool: |
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| 405 | case tok_tristate: |
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| 406 | case tok_dep_tristate: |
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| 407 | case tok_int: |
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| 408 | case tok_hex: |
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| 409 | for(cfg1=cfg;cfg1 != NULL; cfg1 = cfg1->next) |
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| 410 | { |
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| 411 | switch(cfg1->tok) |
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| 412 | { |
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| 413 | case tok_define: |
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| 414 | case tok_bool: |
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| 415 | case tok_tristate: |
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| 416 | case tok_dep_tristate: |
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| 417 | case tok_int: |
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| 418 | case tok_hex: |
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| 419 | if( strcmp(cfg->optionname, cfg1->optionname) == 0) |
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| 420 | { |
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| 421 | cfg->flags |= CFG_DUP; |
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| 422 | cfg1->flags |= CFG_DUP; |
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| 423 | } |
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| 424 | break; |
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| 425 | default: |
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| 426 | break; |
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| 427 | } |
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| 428 | } |
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| 429 | break; |
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| 430 | default: |
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| 431 | break; |
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| 432 | } |
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| 433 | } |
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| 434 | |
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| 435 | /* |
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| 436 | * Now go through the list, and every time we see a kvariable, check |
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| 437 | * to see whether it also has some dependencies. If so, then |
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| 438 | * append it to our list. The reason we do this is that we might have |
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| 439 | * option CONFIG_FOO which is only used if CONFIG_BAR is set. It may |
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| 440 | * turn out that in config.in that the default value for CONFIG_BAR is |
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| 441 | * set to "y", but that CONFIG_BAR is not enabled because CONFIG_XYZZY |
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| 442 | * is not set. The current condition chain does not reflect this, but |
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| 443 | * we can fix this by searching for the tokens that this option depends |
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| 444 | * upon and cloning the conditions and merging them with the list. |
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| 445 | */ |
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| 446 | for(cfg=scfg;cfg != NULL; cfg = cfg->next) |
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| 447 | { |
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| 448 | /* |
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| 449 | * Search for a token that has a condition list. |
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| 450 | */ |
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| 451 | if(cfg->cond == NULL) continue; |
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| 452 | for(cnd = cfg->cond; cnd; cnd=cnd->next) |
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| 453 | { |
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| 454 | /* |
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| 455 | * Now search the condition list for a known configuration variable |
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| 456 | * that has conditions of its own. |
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| 457 | */ |
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| 458 | if(cnd->op != op_kvariable) continue; |
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| 459 | if(cnd->variable.cfg->cond == NULL) continue; |
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| 460 | |
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| 461 | if(cnd->variable.cfg->flags & CFG_DUP) continue; |
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| 462 | /* |
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| 463 | * OK, we have some conditions to append to cfg. Make a clone |
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| 464 | * of the conditions, |
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| 465 | */ |
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| 466 | newcond = get_token_cond_frag(cnd->variable.cfg->cond, &last); |
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| 467 | |
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| 468 | /* |
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| 469 | * Finally, we splice it into our list. |
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| 470 | */ |
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| 471 | last->next = cfg->cond; |
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| 472 | cfg->cond = newcond; |
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| 473 | |
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| 474 | } |
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| 475 | } |
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| 476 | |
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| 477 | /* |
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| 478 | * There is a strong possibility that we have duplicate conditions |
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| 479 | * in here. It would make the script more efficient and readable to |
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| 480 | * remove these. Here is where we assume here that there are no |
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| 481 | * parenthesis in the input script. |
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| 482 | */ |
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| 483 | for(cfg=scfg;cfg != NULL; cfg = cfg->next) |
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| 484 | { |
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| 485 | /* |
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| 486 | * Search for configuration options that have conditions. |
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| 487 | */ |
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| 488 | if(cfg->cond == NULL) continue; |
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| 489 | for(cnd = cfg->cond; cnd; cnd=cnd->next) |
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| 490 | { |
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| 491 | /* |
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| 492 | * Search for a left parenthesis. |
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| 493 | */ |
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| 494 | if(cnd->op != op_lparen) continue; |
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| 495 | for(cnd1 = cnd->next; cnd1; cnd1=cnd1->next) |
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| 496 | { |
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| 497 | /* |
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| 498 | * Search after the previous left parenthesis, and try |
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| 499 | * and find a second left parenthesis. |
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| 500 | */ |
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| 501 | if(cnd1->op != op_lparen) continue; |
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| 502 | |
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| 503 | /* |
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| 504 | * Now compare the next 5 tokens to see if they are |
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| 505 | * identical. We are looking for two chains that |
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| 506 | * are like: '(' $VARIABLE operator constant ')'. |
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| 507 | */ |
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| 508 | cnd2 = cnd; |
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| 509 | cnd3 = cnd1; |
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| 510 | for(i=0; i<5; i++, cnd2=cnd2->next, cnd3=cnd3->next) |
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| 511 | { |
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| 512 | if(!cnd2 || !cnd3) break; |
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| 513 | if(cnd2->op != cnd3->op) break; |
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| 514 | if(i == 1 && (cnd2->op != op_kvariable |
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| 515 | || cnd2->variable.cfg != cnd3->variable.cfg) ) break; |
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| 516 | if(i==2 && cnd2->op != op_eq && cnd2->op != op_neq) break; |
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| 517 | if(i == 3 && cnd2->op != op_constant && |
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| 518 | strcmp(cnd2->variable.str, cnd3->variable.str) != 0) |
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| 519 | break; |
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| 520 | if(i==4 && cnd2->op != op_rparen) break; |
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| 521 | } |
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| 522 | /* |
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| 523 | * If these match, and there is an and gluing these together, |
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| 524 | * then we can nuke the second one. |
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| 525 | */ |
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| 526 | if(i==5 && ((cnd3 && cnd3->op == op_and) |
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| 527 | ||(cnd2 && cnd2->op == op_and))) |
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| 528 | { |
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| 529 | /* |
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| 530 | * We have a duplicate. Nuke 5 ops. |
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| 531 | */ |
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| 532 | cnd3 = cnd1; |
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| 533 | for(i=0; i<5; i++, cnd3=cnd3->next) |
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| 534 | { |
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| 535 | cnd3->op = op_nuked; |
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| 536 | } |
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| 537 | /* |
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| 538 | * Nuke the and that glues the conditions together. |
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| 539 | */ |
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| 540 | if(cnd3 && cnd3->op == op_and) cnd3->op = op_nuked; |
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| 541 | else if(cnd2 && cnd2->op == op_and) cnd2->op = op_nuked; |
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| 542 | } |
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| 543 | } |
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| 544 | } |
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| 545 | } |
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| 546 | } |
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