1 | #ifdef CONFIG_WITH_IF_CONDITIONALS
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2 | /* $Id: expreval.c 1729 2008-09-05 03:50:10Z bird $ */
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3 | /** @file
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4 | * expreval - Expressions evaluator, C / BSD make / nmake style.
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5 | */
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6 |
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7 | /*
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8 | * Copyright (c) 2008 knut st. osmundsen <[email protected]>
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9 | *
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10 | * This file is part of kBuild.
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11 | *
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12 | * kBuild is free software; you can redistribute it and/or modify
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13 | * it under the terms of the GNU General Public License as published by
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14 | * the Free Software Foundation; either version 2 of the License, or
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15 | * (at your option) any later version.
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16 | *
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17 | * kBuild is distributed in the hope that it will be useful,
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | * GNU General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with kBuild; if not, write to the Free Software
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24 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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25 | *
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26 | */
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27 |
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28 | /*******************************************************************************
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29 | * Header Files *
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30 | *******************************************************************************/
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31 | #include "make.h"
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32 | #include <assert.h>
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33 |
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34 | #include <glob.h>
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35 |
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36 | #include "dep.h"
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37 | #include "filedef.h"
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38 | #include "job.h"
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39 | #include "commands.h"
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40 | #include "variable.h"
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41 | #include "rule.h"
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42 | #include "debug.h"
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43 | #include "hash.h"
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44 | #include <ctype.h>
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45 | #ifndef _MSC_VER
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46 | # include <stdint.h>
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47 | #endif
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48 | #include <stdarg.h>
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49 |
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50 |
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51 | /*******************************************************************************
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52 | * Defined Constants And Macros *
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53 | *******************************************************************************/
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54 | /** The max length of a string representation of a number. */
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55 | #define EXPR_NUM_LEN ((sizeof("-9223372036854775802") + 4) & ~3)
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56 |
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57 | /** The max operator stack depth. */
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58 | #define EXPR_MAX_OPERATORS 72
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59 | /** The max operand depth. */
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60 | #define EXPR_MAX_OPERANDS 128
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61 |
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62 |
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63 | /*******************************************************************************
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64 | * Structures and Typedefs *
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65 | *******************************************************************************/
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66 | /** The 64-bit signed integer type we're using. */
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67 | #ifdef _MSC_VER
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68 | typedef __int64 EXPRINT64;
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69 | #else
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70 | # include <stdint.h>
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71 | typedef int64_t EXPRINT64;
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72 | #endif
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73 |
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74 | /** Pointer to a evaluator instance. */
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75 | typedef struct EXPR *PEXPR;
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76 |
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77 |
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78 | /**
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79 | * Operand variable type.
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80 | */
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81 | typedef enum
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82 | {
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83 | /** Invalid zero entry. */
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84 | kExprVar_Invalid = 0,
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85 | /** A number. */
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86 | kExprVar_Num,
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87 | /** A string in need of expanding (perhaps). */
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88 | kExprVar_String,
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89 | /** A simple string that doesn't need expanding. */
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90 | kExprVar_SimpleString,
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91 | /** A quoted string in need of expanding (perhaps). */
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92 | kExprVar_QuotedString,
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93 | /** A simple quoted string that doesn't need expanding. */
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94 | kExprVar_QuotedSimpleString,
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95 | /** The end of the valid variable types. */
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96 | kExprVar_End
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97 | } EXPRVARTYPE;
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98 |
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99 | /**
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100 | * Operand variable.
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101 | */
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102 | typedef struct
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103 | {
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104 | /** The variable type. */
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105 | EXPRVARTYPE enmType;
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106 | /** The variable. */
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107 | union
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108 | {
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109 | /** Pointer to the string. */
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110 | char *psz;
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111 | /** The variable. */
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112 | EXPRINT64 i;
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113 | } uVal;
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114 | } EXPRVAR;
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115 | /** Pointer to a operand variable. */
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116 | typedef EXPRVAR *PEXPRVAR;
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117 | /** Pointer to a const operand variable. */
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118 | typedef EXPRVAR const *PCEXPRVAR;
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119 |
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120 | /**
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121 | * Operator return statuses.
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122 | */
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123 | typedef enum
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124 | {
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125 | kExprRet_Error = -1,
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126 | kExprRet_Ok = 0,
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127 | kExprRet_Operator,
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128 | kExprRet_Operand,
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129 | kExprRet_EndOfExpr,
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130 | kExprRet_End
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131 | } EXPRRET;
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132 |
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133 | /**
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134 | * Operator.
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135 | */
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136 | typedef struct
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137 | {
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138 | /** The operator. */
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139 | char szOp[11];
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140 | /** The length of the operator string. */
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141 | char cchOp;
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142 | /** The pair operator.
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143 | * This is used with '(' and '?'. */
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144 | char chPair;
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145 | /** The precedence. Higher means higher. */
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146 | char iPrecedence;
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147 | /** The number of arguments it takes. */
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148 | signed char cArgs;
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149 | /** Pointer to the method implementing the operator. */
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150 | EXPRRET (*pfn)(PEXPR pThis);
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151 | } EXPROP;
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152 | /** Pointer to a const operator. */
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153 | typedef EXPROP const *PCEXPROP;
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154 |
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155 | /**
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156 | * Expression evaluator instance.
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157 | */
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158 | typedef struct EXPR
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159 | {
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160 | /** The full expression. */
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161 | const char *pszExpr;
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162 | /** The current location. */
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163 | const char *psz;
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164 | /** The current file location, used for errors. */
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165 | const struct floc *pFileLoc;
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166 | /** Pending binary operator. */
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167 | PCEXPROP pPending;
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168 | /** Top of the operator stack. */
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169 | int iOp;
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170 | /** Top of the operand stack. */
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171 | int iVar;
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172 | /** The operator stack. */
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173 | PCEXPROP apOps[EXPR_MAX_OPERATORS];
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174 | /** The operand stack. */
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175 | EXPRVAR aVars[EXPR_MAX_OPERANDS];
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176 | } EXPR;
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177 |
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178 |
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179 | /*******************************************************************************
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180 | * Global Variables *
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181 | *******************************************************************************/
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182 | /** Operator start character map.
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183 | * This indicates which characters that are starting operators and which aren't. */
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184 | static char g_auchOpStartCharMap[256];
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185 | /** Whether we've initialized the map. */
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186 | static int g_fExprInitializedMap = 0;
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187 |
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188 |
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189 | /*******************************************************************************
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190 | * Internal Functions *
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191 | *******************************************************************************/
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192 | static void expr_unget_op(PEXPR pThis);
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193 | static EXPRRET expr_get_binary_or_eoe_or_rparen(PEXPR pThis);
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194 |
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195 |
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196 |
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197 |
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198 | /**
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199 | * Displays an error message.
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200 | *
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201 | * The total string length must not exceed 256 bytes.
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202 | *
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203 | * @param pThis The evaluator instance.
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204 | * @param pszError The message format string.
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205 | * @param ... The message format args.
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206 | */
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207 | static void expr_error(PEXPR pThis, const char *pszError, ...)
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208 | {
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209 | char szTmp[256];
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210 | va_list va;
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211 |
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212 | va_start(va, pszError);
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213 | vsprintf(szTmp, pszError, va);
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214 | va_end(va);
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215 |
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216 | fatal(pThis->pFileLoc, "%s", szTmp);
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217 | }
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218 |
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219 |
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220 | /**
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221 | * Converts a number to a string.
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222 | *
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223 | * @returns pszDst.
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224 | * @param pszDst The string buffer to write into. Assumes length of EXPR_NUM_LEN.
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225 | * @param iSrc The number to convert.
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226 | */
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227 | static char *expr_num_to_string(char *pszDst, EXPRINT64 iSrc)
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228 | {
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229 | static const char s_szDigits[17] = "0123456789abcdef";
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230 | char szTmp[EXPR_NUM_LEN];
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231 | char *psz = &szTmp[EXPR_NUM_LEN - 1];
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232 | int fNegative;
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233 |
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234 | fNegative = iSrc < 0;
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235 | if (fNegative)
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236 | {
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237 | /** @todo this isn't right for INT64_MIN. */
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238 | iSrc = -iSrc;
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239 | }
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240 |
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241 | *psz = '\0';
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242 | do
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243 | {
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244 | #if 0
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245 | *--psz = s_szDigits[iSrc & 0xf];
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246 | iSrc >>= 4;
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247 | #else
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248 | *--psz = s_szDigits[iSrc % 10];
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249 | iSrc /= 10;
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250 | #endif
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251 | } while (iSrc);
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252 |
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253 | #if 0
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254 | *--psz = 'x';
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255 | *--psz = '0';
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256 | #endif
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257 |
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258 | if (fNegative)
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259 | *--psz = '-';
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260 |
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261 | /* copy it into the output buffer. */
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262 | return (char *)memcpy(pszDst, psz, &szTmp[EXPR_NUM_LEN] - psz);
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263 | }
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264 |
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265 |
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266 | /**
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267 | * Attempts to convert a (simple) string into a number.
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268 | *
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269 | * @returns status code.
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270 | * @param pThis The evaluator instance. This is optional when fQuiet is true.
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271 | * @param piSrc Where to store the numeric value on success.
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272 | * @param pszSrc The string to try convert.
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273 | * @param fQuiet Whether we should be quiet or grumpy on failure.
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274 | */
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275 | static EXPRRET expr_string_to_num(PEXPR pThis, EXPRINT64 *piDst, const char *pszSrc, int fQuiet)
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276 | {
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277 | EXPRRET rc = kExprRet_Ok;
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278 | char const *psz = pszSrc;
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279 | EXPRINT64 i;
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280 | unsigned uBase;
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281 | int fNegative;
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282 |
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283 |
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284 | /*
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285 | * Skip blanks.
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286 | */
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287 | while (isblank(*psz))
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288 | psz++;
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289 |
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290 | /*
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291 | * Check for '-'.
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292 | *
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293 | * At this point we will not need to deal with operators, this is
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294 | * just an indicator of negative numbers. If some operator ends up
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295 | * here it's because it came from a string expansion and thus shall
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296 | * not be interpreted. If this turns out to be an stupid restriction
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297 | * it can be fixed, but for now it stays like this.
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298 | */
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299 | fNegative = *psz == '-';
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300 | if (fNegative)
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301 | psz++;
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302 |
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303 | /*
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304 | * Determin base .
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305 | * .
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306 | * Recognize some exsotic prefixes here in addition to the two standard ones.
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307 | */
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308 | if (*psz != '0' || psz[1] == '\0' || isblank((unsigned int)psz[1]))
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309 | uBase = 10;
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310 | else if (psz[1] == 'x' || psz[1] == 'X')
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311 | {
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312 | uBase = 16;
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313 | psz += 2;
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314 | }
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315 | else if (psz[1] == 'b' || psz[1] == 'B')
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316 | {
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317 | uBase = 2;
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318 | psz += 2;
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319 | }
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320 | else if (psz[1] == 'd' || psz[1] == 'D')
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321 | {
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322 | uBase = 10;
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323 | psz += 2;
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324 | }
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325 | else if (psz[1] == 'o' || psz[1] == 'O')
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326 | {
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327 | uBase = 8;
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328 | psz += 2;
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329 | }
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330 | else if (isdigit(psz[1]) && psz[1] != '9' && psz[1] != '8')
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331 | {
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332 | uBase = 8;
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333 | psz++;
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334 | }
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335 | else
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336 | uBase = 10;
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337 |
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338 | /*
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339 | * Convert until we hit a non-digit.
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340 | */
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341 | i = 0;
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342 | for (;;)
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343 | {
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344 | unsigned iDigit;
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345 | int ch = *psz;
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346 | switch (ch)
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347 | {
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348 | case '0': iDigit = 0; break;
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349 | case '1': iDigit = 1; break;
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350 | case '2': iDigit = 2; break;
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351 | case '3': iDigit = 3; break;
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352 | case '4': iDigit = 4; break;
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353 | case '5': iDigit = 5; break;
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354 | case '6': iDigit = 6; break;
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355 | case '7': iDigit = 7; break;
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356 | case '8': iDigit = 8; break;
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357 | case '9': iDigit = 9; break;
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358 | case 'a':
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359 | case 'A': iDigit = 10; break;
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360 | case 'b':
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361 | case 'B': iDigit = 11; break;
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362 | case 'c':
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363 | case 'C': iDigit = 12; break;
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364 | case 'd':
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365 | case 'D': iDigit = 13; break;
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366 | case 'e':
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367 | case 'E': iDigit = 14; break;
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368 | case 'f':
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369 | case 'F': iDigit = 15; break;
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370 |
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371 | default:
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372 | /* is the rest white space? */
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373 | while (isspace((unsigned int)*psz))
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374 | psz++;
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375 | if (*psz != '\0')
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376 | {
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377 | iDigit = uBase;
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378 | break;
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379 | }
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380 | /* fall thru */
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381 |
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382 | case '\0':
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383 | if (fNegative)
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384 | i = -i;
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385 | *piDst = i;
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386 | return rc;
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387 | }
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388 | if (iDigit >= uBase)
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389 | {
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390 | if (fNegative)
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391 | i = -i;
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392 | *piDst = i;
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393 | if (!fQuiet)
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394 | expr_error(pThis, "Invalid a number \"%.80s\"", pszSrc);
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395 | return kExprRet_Error;
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396 | }
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397 |
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398 | /* add the digit and advance */
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399 | i *= uBase;
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400 | i += iDigit;
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401 | psz++;
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402 | }
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403 | /* not reached */
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404 | }
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405 |
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406 |
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407 | /**
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408 | * Checks if the variable is a string or not.
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409 | *
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410 | * @returns 1 if it's a string, 0 otherwise.
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411 | * @param pVar The variable.
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412 | */
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413 | static int expr_var_is_string(PCEXPRVAR pVar)
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414 | {
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415 | return pVar->enmType >= kExprVar_String;
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416 | }
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417 |
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418 |
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419 | /**
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420 | * Checks if the variable contains a string that was quoted
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421 | * in the expression.
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422 | *
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423 | * @returns 1 if if was a quoted string, otherwise 0.
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424 | * @param pVar The variable.
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425 | */
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426 | static int expr_var_was_quoted(PCEXPRVAR pVar)
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427 | {
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428 | return pVar->enmType >= kExprVar_QuotedString;
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429 | }
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430 |
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431 |
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432 | /**
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433 | * Deletes a variable.
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434 | *
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435 | * @param pVar The variable.
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436 | */
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437 | static void expr_var_delete(PEXPRVAR pVar)
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438 | {
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439 | if (expr_var_is_string(pVar))
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440 | {
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441 | free(pVar->uVal.psz);
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442 | pVar->uVal.psz = NULL;
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443 | }
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444 | pVar->enmType = kExprVar_Invalid;
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445 | }
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446 |
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447 |
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448 | /**
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449 | * Initializes a new variables with a sub-string value.
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450 | *
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451 | * @param pVar The new variable.
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452 | * @param psz The start of the string value.
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453 | * @param cch The number of chars to copy.
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454 | * @param enmType The string type.
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455 | */
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456 | static void expr_var_init_substring(PEXPRVAR pVar, const char *psz, size_t cch, EXPRVARTYPE enmType)
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457 | {
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458 | /* convert string needing expanding into simple ones if possible. */
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459 | if ( enmType == kExprVar_String
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460 | && !memchr(psz, '$', cch))
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461 | enmType = kExprVar_SimpleString;
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462 | else if ( enmType == kExprVar_QuotedString
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463 | && !memchr(psz, '$', cch))
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464 | enmType = kExprVar_QuotedSimpleString;
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465 |
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466 | pVar->enmType = enmType;
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467 | pVar->uVal.psz = xmalloc(cch + 1);
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468 | memcpy(pVar->uVal.psz, psz, cch);
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469 | pVar->uVal.psz[cch] = '\0';
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470 | }
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471 |
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472 |
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473 | #if 0 /* unused */
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474 | /**
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475 | * Initializes a new variables with a string value.
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476 | *
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477 | * @param pVar The new variable.
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478 | * @param psz The string value.
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479 | * @param enmType The string type.
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480 | */
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481 | static void expr_var_init_string(PEXPRVAR pVar, const char *psz, EXPRVARTYPE enmType)
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482 | {
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483 | expr_var_init_substring(pVar, psz, strlen(psz), enmType);
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484 | }
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485 |
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486 |
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487 | /**
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488 | * Assigns a sub-string value to a variable.
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489 | *
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490 | * @param pVar The new variable.
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491 | * @param psz The start of the string value.
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492 | * @param cch The number of chars to copy.
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493 | * @param enmType The string type.
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494 | */
|
---|
495 | static void expr_var_assign_substring(PEXPRVAR pVar, const char *psz, size_t cch, EXPRVARTYPE enmType)
|
---|
496 | {
|
---|
497 | expr_var_delete(pVar);
|
---|
498 | expr_var_init_substring(pVar, psz, cch, enmType);
|
---|
499 | }
|
---|
500 |
|
---|
501 |
|
---|
502 | /**
|
---|
503 | * Assignes a string value to a variable.
|
---|
504 | *
|
---|
505 | * @param pVar The variable.
|
---|
506 | * @param psz The string value.
|
---|
507 | * @param enmType The string type.
|
---|
508 | */
|
---|
509 | static void expr_var_assign_string(PEXPRVAR pVar, const char *psz, EXPRVARTYPE enmType)
|
---|
510 | {
|
---|
511 | expr_var_delete(pVar);
|
---|
512 | expr_var_init_string(pVar, psz, enmType);
|
---|
513 | }
|
---|
514 | #endif /* unused */
|
---|
515 |
|
---|
516 |
|
---|
517 | /**
|
---|
518 | * Simplifies a string variable.
|
---|
519 | *
|
---|
520 | * @param pVar The variable.
|
---|
521 | */
|
---|
522 | static void expr_var_make_simple_string(PEXPRVAR pVar)
|
---|
523 | {
|
---|
524 | switch (pVar->enmType)
|
---|
525 | {
|
---|
526 | case kExprVar_Num:
|
---|
527 | {
|
---|
528 | char *psz = (char *)xmalloc(EXPR_NUM_LEN);
|
---|
529 | expr_num_to_string(psz, pVar->uVal.i);
|
---|
530 | pVar->uVal.psz = psz;
|
---|
531 | pVar->enmType = kExprVar_SimpleString;
|
---|
532 | break;
|
---|
533 | }
|
---|
534 |
|
---|
535 | case kExprVar_String:
|
---|
536 | case kExprVar_QuotedString:
|
---|
537 | {
|
---|
538 | char *psz;
|
---|
539 | assert(strchr(pVar->uVal.psz, '$'));
|
---|
540 |
|
---|
541 | psz = allocated_variable_expand(pVar->uVal.psz);
|
---|
542 | free(pVar->uVal.psz);
|
---|
543 | pVar->uVal.psz = psz;
|
---|
544 |
|
---|
545 | pVar->enmType = pVar->enmType == kExprVar_String
|
---|
546 | ? kExprVar_SimpleString
|
---|
547 | : kExprVar_QuotedSimpleString;
|
---|
548 | break;
|
---|
549 | }
|
---|
550 |
|
---|
551 | case kExprVar_SimpleString:
|
---|
552 | case kExprVar_QuotedSimpleString:
|
---|
553 | /* nothing to do. */
|
---|
554 | break;
|
---|
555 |
|
---|
556 | default:
|
---|
557 | assert(0);
|
---|
558 | }
|
---|
559 | }
|
---|
560 |
|
---|
561 |
|
---|
562 | #if 0 /* unused */
|
---|
563 | /**
|
---|
564 | * Turns a variable into a string value.
|
---|
565 | *
|
---|
566 | * @param pVar The variable.
|
---|
567 | */
|
---|
568 | static void expr_var_make_string(PEXPRVAR pVar)
|
---|
569 | {
|
---|
570 | switch (pVar->enmType)
|
---|
571 | {
|
---|
572 | case kExprVar_Num:
|
---|
573 | expr_var_make_simple_string(pVar);
|
---|
574 | break;
|
---|
575 |
|
---|
576 | case kExprVar_String:
|
---|
577 | case kExprVar_SimpleString:
|
---|
578 | case kExprVar_QuotedString:
|
---|
579 | case kExprVar_QuotedSimpleString:
|
---|
580 | /* nothing to do. */
|
---|
581 | break;
|
---|
582 |
|
---|
583 | default:
|
---|
584 | assert(0);
|
---|
585 | }
|
---|
586 | }
|
---|
587 | #endif /* unused */
|
---|
588 |
|
---|
589 |
|
---|
590 | /**
|
---|
591 | * Initializes a new variables with a integer value.
|
---|
592 | *
|
---|
593 | * @param pVar The new variable.
|
---|
594 | * @param i The integer value.
|
---|
595 | */
|
---|
596 | static void expr_var_init_num(PEXPRVAR pVar, EXPRINT64 i)
|
---|
597 | {
|
---|
598 | pVar->enmType = kExprVar_Num;
|
---|
599 | pVar->uVal.i = i;
|
---|
600 | }
|
---|
601 |
|
---|
602 |
|
---|
603 | /**
|
---|
604 | * Assigns a integer value to a variable.
|
---|
605 | *
|
---|
606 | * @param pVar The variable.
|
---|
607 | * @param i The integer value.
|
---|
608 | */
|
---|
609 | static void expr_var_assign_num(PEXPRVAR pVar, EXPRINT64 i)
|
---|
610 | {
|
---|
611 | expr_var_delete(pVar);
|
---|
612 | expr_var_init_num(pVar, i);
|
---|
613 | }
|
---|
614 |
|
---|
615 |
|
---|
616 | /**
|
---|
617 | * Turns the variable into a number.
|
---|
618 | *
|
---|
619 | * @returns status code.
|
---|
620 | * @param pThis The evaluator instance.
|
---|
621 | * @param pVar The variable.
|
---|
622 | */
|
---|
623 | static EXPRRET expr_var_make_num(PEXPR pThis, PEXPRVAR pVar)
|
---|
624 | {
|
---|
625 | switch (pVar->enmType)
|
---|
626 | {
|
---|
627 | case kExprVar_Num:
|
---|
628 | /* nothing to do. */
|
---|
629 | break;
|
---|
630 |
|
---|
631 | case kExprVar_String:
|
---|
632 | expr_var_make_simple_string(pVar);
|
---|
633 | /* fall thru */
|
---|
634 | case kExprVar_SimpleString:
|
---|
635 | {
|
---|
636 | EXPRINT64 i;
|
---|
637 | EXPRRET rc = expr_string_to_num(pThis, &i, pVar->uVal.psz, 0 /* fQuiet */);
|
---|
638 | if (rc < kExprRet_Ok)
|
---|
639 | return rc;
|
---|
640 | expr_var_assign_num(pVar, i);
|
---|
641 | break;
|
---|
642 | }
|
---|
643 |
|
---|
644 | case kExprVar_QuotedString:
|
---|
645 | case kExprVar_QuotedSimpleString:
|
---|
646 | expr_error(pThis, "Cannot convert a quoted string to a number");
|
---|
647 | return kExprRet_Error;
|
---|
648 |
|
---|
649 | default:
|
---|
650 | assert(0);
|
---|
651 | return kExprRet_Error;
|
---|
652 | }
|
---|
653 |
|
---|
654 | return kExprRet_Ok;
|
---|
655 | }
|
---|
656 |
|
---|
657 |
|
---|
658 | /**
|
---|
659 | * Try to turn the variable into a number.
|
---|
660 | *
|
---|
661 | * @returns status code.
|
---|
662 | * @param pVar The variable.
|
---|
663 | */
|
---|
664 | static EXPRRET expr_var_try_make_num(PEXPRVAR pVar)
|
---|
665 | {
|
---|
666 | switch (pVar->enmType)
|
---|
667 | {
|
---|
668 | case kExprVar_Num:
|
---|
669 | /* nothing to do. */
|
---|
670 | break;
|
---|
671 |
|
---|
672 | case kExprVar_String:
|
---|
673 | expr_var_make_simple_string(pVar);
|
---|
674 | /* fall thru */
|
---|
675 | case kExprVar_SimpleString:
|
---|
676 | {
|
---|
677 | EXPRINT64 i;
|
---|
678 | EXPRRET rc = expr_string_to_num(NULL, &i, pVar->uVal.psz, 1 /* fQuiet */);
|
---|
679 | if (rc < kExprRet_Ok)
|
---|
680 | return rc;
|
---|
681 | expr_var_assign_num(pVar, i);
|
---|
682 | break;
|
---|
683 | }
|
---|
684 |
|
---|
685 | default:
|
---|
686 | assert(0);
|
---|
687 | case kExprVar_QuotedString:
|
---|
688 | case kExprVar_QuotedSimpleString:
|
---|
689 | /* can't do this */
|
---|
690 | return kExprRet_Error;
|
---|
691 | }
|
---|
692 |
|
---|
693 | return kExprRet_Ok;
|
---|
694 | }
|
---|
695 |
|
---|
696 |
|
---|
697 | /**
|
---|
698 | * Initializes a new variables with a boolean value.
|
---|
699 | *
|
---|
700 | * @param pVar The new variable.
|
---|
701 | * @param f The boolean value.
|
---|
702 | */
|
---|
703 | static void expr_var_init_bool(PEXPRVAR pVar, int f)
|
---|
704 | {
|
---|
705 | pVar->enmType = kExprVar_Num;
|
---|
706 | pVar->uVal.i = !!f;
|
---|
707 | }
|
---|
708 |
|
---|
709 |
|
---|
710 | /**
|
---|
711 | * Assigns a boolean value to a variable.
|
---|
712 | *
|
---|
713 | * @param pVar The variable.
|
---|
714 | * @param f The boolean value.
|
---|
715 | */
|
---|
716 | static void expr_var_assign_bool(PEXPRVAR pVar, int f)
|
---|
717 | {
|
---|
718 | expr_var_delete(pVar);
|
---|
719 | expr_var_init_bool(pVar, f);
|
---|
720 | }
|
---|
721 |
|
---|
722 |
|
---|
723 | /**
|
---|
724 | * Turns the variable into an boolean.
|
---|
725 | *
|
---|
726 | * @returns the boolean interpretation.
|
---|
727 | * @param pVar The variable.
|
---|
728 | */
|
---|
729 | static int expr_var_make_bool(PEXPRVAR pVar)
|
---|
730 | {
|
---|
731 | switch (pVar->enmType)
|
---|
732 | {
|
---|
733 | case kExprVar_Num:
|
---|
734 | pVar->uVal.i = !!pVar->uVal.i;
|
---|
735 | break;
|
---|
736 |
|
---|
737 | case kExprVar_String:
|
---|
738 | expr_var_make_simple_string(pVar);
|
---|
739 | /* fall thru */
|
---|
740 | case kExprVar_SimpleString:
|
---|
741 | {
|
---|
742 | /*
|
---|
743 | * Try convert it to a number. If that fails, use the
|
---|
744 | * GNU make boolean logic - not empty string means true.
|
---|
745 | */
|
---|
746 | EXPRINT64 iVal;
|
---|
747 | char const *psz = pVar->uVal.psz;
|
---|
748 | while (isblank((unsigned char)*psz))
|
---|
749 | psz++;
|
---|
750 | if ( *psz
|
---|
751 | && expr_string_to_num(NULL, &iVal, psz, 1 /* fQuiet */) >= kExprRet_Ok)
|
---|
752 | expr_var_assign_bool(pVar, iVal != 0);
|
---|
753 | else
|
---|
754 | expr_var_assign_bool(pVar, *psz != '\0');
|
---|
755 | break;
|
---|
756 | }
|
---|
757 |
|
---|
758 | case kExprVar_QuotedString:
|
---|
759 | expr_var_make_simple_string(pVar);
|
---|
760 | /* fall thru */
|
---|
761 | case kExprVar_QuotedSimpleString:
|
---|
762 | /*
|
---|
763 | * Use GNU make boolean logic (not empty string means true).
|
---|
764 | * No stripping here, the string is quoted.
|
---|
765 | */
|
---|
766 | expr_var_assign_bool(pVar, *pVar->uVal.psz != '\0');
|
---|
767 | break;
|
---|
768 |
|
---|
769 | default:
|
---|
770 | assert(0);
|
---|
771 | break;
|
---|
772 | }
|
---|
773 |
|
---|
774 | return pVar->uVal.i;
|
---|
775 | }
|
---|
776 |
|
---|
777 |
|
---|
778 | /**
|
---|
779 | * Pops a varable off the stack and deletes it.
|
---|
780 | * @param pThis The evaluator instance.
|
---|
781 | */
|
---|
782 | static void expr_pop_and_delete_var(PEXPR pThis)
|
---|
783 | {
|
---|
784 | expr_var_delete(&pThis->aVars[pThis->iVar]);
|
---|
785 | pThis->iVar--;
|
---|
786 | }
|
---|
787 |
|
---|
788 |
|
---|
789 |
|
---|
790 | /**
|
---|
791 | * Tries to make the variables the same type.
|
---|
792 | *
|
---|
793 | * This will not convert numbers to strings, unless one of them
|
---|
794 | * is a quoted string.
|
---|
795 | *
|
---|
796 | * this will try convert both to numbers if neither is quoted. Both
|
---|
797 | * conversions will have to suceed for this to be commited.
|
---|
798 | *
|
---|
799 | * All strings will be simplified.
|
---|
800 | *
|
---|
801 | * @returns status code. Done complaining on failure.
|
---|
802 | *
|
---|
803 | * @param pThis The evaluator instance.
|
---|
804 | * @param pVar1 The first variable.
|
---|
805 | * @param pVar2 The second variable.
|
---|
806 | */
|
---|
807 | static EXPRRET expr_var_unify_types(PEXPR pThis, PEXPRVAR pVar1, PEXPRVAR pVar2, const char *pszOp)
|
---|
808 | {
|
---|
809 | /*
|
---|
810 | * Try make the variables the same type before comparing.
|
---|
811 | */
|
---|
812 | if ( !expr_var_was_quoted(pVar1)
|
---|
813 | && !expr_var_was_quoted(pVar2))
|
---|
814 | {
|
---|
815 | if ( expr_var_is_string(pVar1)
|
---|
816 | || expr_var_is_string(pVar2))
|
---|
817 | {
|
---|
818 | if (!expr_var_is_string(pVar1))
|
---|
819 | expr_var_try_make_num(pVar2);
|
---|
820 | else if (!expr_var_is_string(pVar2))
|
---|
821 | expr_var_try_make_num(pVar1);
|
---|
822 | else
|
---|
823 | {
|
---|
824 | /*
|
---|
825 | * Both are strings, simplify them then see if both can be made into numbers.
|
---|
826 | */
|
---|
827 | EXPRINT64 iVar1;
|
---|
828 | EXPRINT64 iVar2;
|
---|
829 |
|
---|
830 | expr_var_make_simple_string(pVar1);
|
---|
831 | expr_var_make_simple_string(pVar2);
|
---|
832 |
|
---|
833 | if ( expr_string_to_num(NULL, &iVar1, pVar1->uVal.psz, 1 /* fQuiet */) >= kExprRet_Ok
|
---|
834 | && expr_string_to_num(NULL, &iVar2, pVar2->uVal.psz, 1 /* fQuiet */) >= kExprRet_Ok)
|
---|
835 | {
|
---|
836 | expr_var_assign_num(pVar1, iVar1);
|
---|
837 | expr_var_assign_num(pVar2, iVar2);
|
---|
838 | }
|
---|
839 | }
|
---|
840 | }
|
---|
841 | }
|
---|
842 | else
|
---|
843 | {
|
---|
844 | expr_var_make_simple_string(pVar1);
|
---|
845 | expr_var_make_simple_string(pVar2);
|
---|
846 | }
|
---|
847 |
|
---|
848 | /*
|
---|
849 | * Complain if they aren't the same type now.
|
---|
850 | */
|
---|
851 | if (expr_var_is_string(pVar1) != expr_var_is_string(pVar2))
|
---|
852 | {
|
---|
853 | expr_error(pThis, "Unable to unify types for \"%s\"", pszOp);
|
---|
854 | return kExprRet_Error;
|
---|
855 | }
|
---|
856 | return kExprRet_Ok;
|
---|
857 | }
|
---|
858 |
|
---|
859 |
|
---|
860 | /**
|
---|
861 | * Is variable defined, unary.
|
---|
862 | *
|
---|
863 | * @returns Status code.
|
---|
864 | * @param pThis The instance.
|
---|
865 | */
|
---|
866 | static EXPRRET expr_op_defined(PEXPR pThis)
|
---|
867 | {
|
---|
868 | PEXPRVAR pVar = &pThis->aVars[pThis->iVar];
|
---|
869 | struct variable *pMakeVar;
|
---|
870 |
|
---|
871 | expr_var_make_simple_string(pVar);
|
---|
872 | pMakeVar = lookup_variable(pVar->uVal.psz, strlen(pVar->uVal.psz));
|
---|
873 | expr_var_assign_bool(pVar, pMakeVar && *pMakeVar->value != '\0');
|
---|
874 |
|
---|
875 | return kExprRet_Ok;
|
---|
876 | }
|
---|
877 |
|
---|
878 |
|
---|
879 | /**
|
---|
880 | * Is target defined, unary.
|
---|
881 | *
|
---|
882 | * @returns Status code.
|
---|
883 | * @param pThis The instance.
|
---|
884 | */
|
---|
885 | static EXPRRET expr_op_target(PEXPR pThis)
|
---|
886 | {
|
---|
887 | PEXPRVAR pVar = &pThis->aVars[pThis->iVar];
|
---|
888 | struct file *pFile = NULL;
|
---|
889 |
|
---|
890 | /*
|
---|
891 | * Because of secondary target expansion, lookup the unexpanded
|
---|
892 | * name first.
|
---|
893 | */
|
---|
894 | #ifdef CONFIG_WITH_2ND_TARGET_EXPANSION
|
---|
895 | if ( pVar->enmType == kExprVar_String
|
---|
896 | || pVar->enmType == kExprVar_QuotedString)
|
---|
897 | {
|
---|
898 | pFile = lookup_file(pVar->uVal.psz);
|
---|
899 | if ( pFile
|
---|
900 | && !pFile->need_2nd_target_expansion)
|
---|
901 | pFile = NULL;
|
---|
902 | }
|
---|
903 | if (!pFile)
|
---|
904 | #endif
|
---|
905 | {
|
---|
906 | expr_var_make_simple_string(pVar);
|
---|
907 | pFile = lookup_file(pVar->uVal.psz);
|
---|
908 | }
|
---|
909 |
|
---|
910 | /*
|
---|
911 | * Always inspect the head of a multiple target rule
|
---|
912 | * and look for a file with commands.
|
---|
913 | */
|
---|
914 | #ifdef CONFIG_WITH_EXPLICIT_MULTITARGET
|
---|
915 | if (pFile && pFile->multi_head)
|
---|
916 | pFile = pFile->multi_head;
|
---|
917 | #endif
|
---|
918 |
|
---|
919 | while (pFile && !pFile->cmds)
|
---|
920 | pFile = pFile->prev;
|
---|
921 |
|
---|
922 | expr_var_assign_bool(pVar, pFile != NULL && pFile->is_target);
|
---|
923 |
|
---|
924 | return kExprRet_Ok;
|
---|
925 | }
|
---|
926 |
|
---|
927 |
|
---|
928 | /**
|
---|
929 | * Convert to boolean.
|
---|
930 | *
|
---|
931 | * @returns Status code.
|
---|
932 | * @param pThis The instance.
|
---|
933 | */
|
---|
934 | static EXPRRET expr_op_bool(PEXPR pThis)
|
---|
935 | {
|
---|
936 | expr_var_make_bool(&pThis->aVars[pThis->iVar]);
|
---|
937 | return kExprRet_Ok;
|
---|
938 | }
|
---|
939 |
|
---|
940 |
|
---|
941 | /**
|
---|
942 | * Convert to number, works on quoted strings too.
|
---|
943 | *
|
---|
944 | * @returns Status code.
|
---|
945 | * @param pThis The instance.
|
---|
946 | */
|
---|
947 | static EXPRRET expr_op_num(PEXPR pThis)
|
---|
948 | {
|
---|
949 | PEXPRVAR pVar = &pThis->aVars[pThis->iVar];
|
---|
950 |
|
---|
951 | /* unquote the string */
|
---|
952 | if (pVar->enmType == kExprVar_QuotedSimpleString)
|
---|
953 | pVar->enmType = kExprVar_SimpleString;
|
---|
954 | else if (pVar->enmType == kExprVar_QuotedString)
|
---|
955 | pVar->enmType = kExprVar_String;
|
---|
956 |
|
---|
957 | return expr_var_make_num(pThis, pVar);
|
---|
958 | }
|
---|
959 |
|
---|
960 |
|
---|
961 | /**
|
---|
962 | * Convert to string (simplified and quoted)
|
---|
963 | *
|
---|
964 | * @returns Status code.
|
---|
965 | * @param pThis The instance.
|
---|
966 | */
|
---|
967 | static EXPRRET expr_op_str(PEXPR pThis)
|
---|
968 | {
|
---|
969 | PEXPRVAR pVar = &pThis->aVars[pThis->iVar];
|
---|
970 |
|
---|
971 | expr_var_make_simple_string(pVar);
|
---|
972 | pVar->enmType = kExprVar_QuotedSimpleString;
|
---|
973 |
|
---|
974 | return kExprRet_Ok;
|
---|
975 | }
|
---|
976 |
|
---|
977 |
|
---|
978 | /**
|
---|
979 | * Pluss (dummy / make_integer)
|
---|
980 | *
|
---|
981 | * @returns Status code.
|
---|
982 | * @param pThis The instance.
|
---|
983 | */
|
---|
984 | static EXPRRET expr_op_pluss(PEXPR pThis)
|
---|
985 | {
|
---|
986 | return expr_var_make_num(pThis, &pThis->aVars[pThis->iVar]);
|
---|
987 | }
|
---|
988 |
|
---|
989 |
|
---|
990 | /**
|
---|
991 | * Minus (negate)
|
---|
992 | *
|
---|
993 | * @returns Status code.
|
---|
994 | * @param pThis The instance.
|
---|
995 | */
|
---|
996 | static EXPRRET expr_op_minus(PEXPR pThis)
|
---|
997 | {
|
---|
998 | EXPRRET rc;
|
---|
999 | PEXPRVAR pVar = &pThis->aVars[pThis->iVar];
|
---|
1000 |
|
---|
1001 | rc = expr_var_make_num(pThis, pVar);
|
---|
1002 | if (rc >= kExprRet_Ok)
|
---|
1003 | pVar->uVal.i = -pVar->uVal.i;
|
---|
1004 |
|
---|
1005 | return rc;
|
---|
1006 | }
|
---|
1007 |
|
---|
1008 |
|
---|
1009 |
|
---|
1010 | /**
|
---|
1011 | * Bitwise NOT.
|
---|
1012 | *
|
---|
1013 | * @returns Status code.
|
---|
1014 | * @param pThis The instance.
|
---|
1015 | */
|
---|
1016 | static EXPRRET expr_op_bitwise_not(PEXPR pThis)
|
---|
1017 | {
|
---|
1018 | EXPRRET rc;
|
---|
1019 | PEXPRVAR pVar = &pThis->aVars[pThis->iVar];
|
---|
1020 |
|
---|
1021 | rc = expr_var_make_num(pThis, pVar);
|
---|
1022 | if (rc >= kExprRet_Ok)
|
---|
1023 | pVar->uVal.i = ~pVar->uVal.i;
|
---|
1024 |
|
---|
1025 | return rc;
|
---|
1026 | }
|
---|
1027 |
|
---|
1028 |
|
---|
1029 | /**
|
---|
1030 | * Logical NOT.
|
---|
1031 | *
|
---|
1032 | * @returns Status code.
|
---|
1033 | * @param pThis The instance.
|
---|
1034 | */
|
---|
1035 | static EXPRRET expr_op_logical_not(PEXPR pThis)
|
---|
1036 | {
|
---|
1037 | PEXPRVAR pVar = &pThis->aVars[pThis->iVar];
|
---|
1038 |
|
---|
1039 | expr_var_make_bool(pVar);
|
---|
1040 | pVar->uVal.i = !pVar->uVal.i;
|
---|
1041 |
|
---|
1042 | return kExprRet_Ok;
|
---|
1043 | }
|
---|
1044 |
|
---|
1045 |
|
---|
1046 | /**
|
---|
1047 | * Multiplication.
|
---|
1048 | *
|
---|
1049 | * @returns Status code.
|
---|
1050 | * @param pThis The instance.
|
---|
1051 | */
|
---|
1052 | static EXPRRET expr_op_multiply(PEXPR pThis)
|
---|
1053 | {
|
---|
1054 | EXPRRET rc = kExprRet_Ok;
|
---|
1055 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1056 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1057 |
|
---|
1058 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1059 | if (rc >= kExprRet_Ok)
|
---|
1060 | {
|
---|
1061 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1062 | if (rc >= kExprRet_Ok)
|
---|
1063 | pVar1->uVal.i *= pVar2->uVal.i;
|
---|
1064 | }
|
---|
1065 |
|
---|
1066 | expr_pop_and_delete_var(pThis);
|
---|
1067 | return rc;
|
---|
1068 | }
|
---|
1069 |
|
---|
1070 |
|
---|
1071 |
|
---|
1072 | /**
|
---|
1073 | * Division.
|
---|
1074 | *
|
---|
1075 | * @returns Status code.
|
---|
1076 | * @param pThis The instance.
|
---|
1077 | */
|
---|
1078 | static EXPRRET expr_op_divide(PEXPR pThis)
|
---|
1079 | {
|
---|
1080 | EXPRRET rc = kExprRet_Ok;
|
---|
1081 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1082 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1083 |
|
---|
1084 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1085 | if (rc >= kExprRet_Ok)
|
---|
1086 | {
|
---|
1087 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1088 | if (rc >= kExprRet_Ok)
|
---|
1089 | pVar1->uVal.i /= pVar2->uVal.i;
|
---|
1090 | }
|
---|
1091 |
|
---|
1092 | expr_pop_and_delete_var(pThis);
|
---|
1093 | return rc;
|
---|
1094 | }
|
---|
1095 |
|
---|
1096 |
|
---|
1097 |
|
---|
1098 | /**
|
---|
1099 | * Modulus.
|
---|
1100 | *
|
---|
1101 | * @returns Status code.
|
---|
1102 | * @param pThis The instance.
|
---|
1103 | */
|
---|
1104 | static EXPRRET expr_op_modulus(PEXPR pThis)
|
---|
1105 | {
|
---|
1106 | EXPRRET rc = kExprRet_Ok;
|
---|
1107 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1108 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1109 |
|
---|
1110 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1111 | if (rc >= kExprRet_Ok)
|
---|
1112 | {
|
---|
1113 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1114 | if (rc >= kExprRet_Ok)
|
---|
1115 | pVar1->uVal.i %= pVar2->uVal.i;
|
---|
1116 | }
|
---|
1117 |
|
---|
1118 | expr_pop_and_delete_var(pThis);
|
---|
1119 | return rc;
|
---|
1120 | }
|
---|
1121 |
|
---|
1122 |
|
---|
1123 |
|
---|
1124 | /**
|
---|
1125 | * Addition (numeric).
|
---|
1126 | *
|
---|
1127 | * @returns Status code.
|
---|
1128 | * @param pThis The instance.
|
---|
1129 | */
|
---|
1130 | static EXPRRET expr_op_add(PEXPR pThis)
|
---|
1131 | {
|
---|
1132 | EXPRRET rc = kExprRet_Ok;
|
---|
1133 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1134 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1135 |
|
---|
1136 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1137 | if (rc >= kExprRet_Ok)
|
---|
1138 | {
|
---|
1139 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1140 | if (rc >= kExprRet_Ok)
|
---|
1141 | pVar1->uVal.i += pVar2->uVal.i;
|
---|
1142 | }
|
---|
1143 |
|
---|
1144 | expr_pop_and_delete_var(pThis);
|
---|
1145 | return rc;
|
---|
1146 | }
|
---|
1147 |
|
---|
1148 |
|
---|
1149 | /**
|
---|
1150 | * Subtract (numeric).
|
---|
1151 | *
|
---|
1152 | * @returns Status code.
|
---|
1153 | * @param pThis The instance.
|
---|
1154 | */
|
---|
1155 | static EXPRRET expr_op_sub(PEXPR pThis)
|
---|
1156 | {
|
---|
1157 | EXPRRET rc = kExprRet_Ok;
|
---|
1158 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1159 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1160 |
|
---|
1161 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1162 | if (rc >= kExprRet_Ok)
|
---|
1163 | {
|
---|
1164 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1165 | if (rc >= kExprRet_Ok)
|
---|
1166 | pVar1->uVal.i -= pVar2->uVal.i;
|
---|
1167 | }
|
---|
1168 |
|
---|
1169 | expr_pop_and_delete_var(pThis);
|
---|
1170 | return rc;
|
---|
1171 | }
|
---|
1172 |
|
---|
1173 | /**
|
---|
1174 | * Bitwise left shift.
|
---|
1175 | *
|
---|
1176 | * @returns Status code.
|
---|
1177 | * @param pThis The instance.
|
---|
1178 | */
|
---|
1179 | static EXPRRET expr_op_shift_left(PEXPR pThis)
|
---|
1180 | {
|
---|
1181 | EXPRRET rc = kExprRet_Ok;
|
---|
1182 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1183 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1184 |
|
---|
1185 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1186 | if (rc >= kExprRet_Ok)
|
---|
1187 | {
|
---|
1188 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1189 | if (rc >= kExprRet_Ok)
|
---|
1190 | pVar1->uVal.i <<= pVar2->uVal.i;
|
---|
1191 | }
|
---|
1192 |
|
---|
1193 | expr_pop_and_delete_var(pThis);
|
---|
1194 | return rc;
|
---|
1195 | }
|
---|
1196 |
|
---|
1197 |
|
---|
1198 | /**
|
---|
1199 | * Bitwise right shift.
|
---|
1200 | *
|
---|
1201 | * @returns Status code.
|
---|
1202 | * @param pThis The instance.
|
---|
1203 | */
|
---|
1204 | static EXPRRET expr_op_shift_right(PEXPR pThis)
|
---|
1205 | {
|
---|
1206 | EXPRRET rc = kExprRet_Ok;
|
---|
1207 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1208 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1209 |
|
---|
1210 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1211 | if (rc >= kExprRet_Ok)
|
---|
1212 | {
|
---|
1213 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1214 | if (rc >= kExprRet_Ok)
|
---|
1215 | pVar1->uVal.i >>= pVar2->uVal.i;
|
---|
1216 | }
|
---|
1217 |
|
---|
1218 | expr_pop_and_delete_var(pThis);
|
---|
1219 | return rc;
|
---|
1220 | }
|
---|
1221 |
|
---|
1222 |
|
---|
1223 | /**
|
---|
1224 | * Less than or equal
|
---|
1225 | *
|
---|
1226 | * @returns Status code.
|
---|
1227 | * @param pThis The instance.
|
---|
1228 | */
|
---|
1229 | static EXPRRET expr_op_less_or_equal_than(PEXPR pThis)
|
---|
1230 | {
|
---|
1231 | EXPRRET rc = kExprRet_Ok;
|
---|
1232 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1233 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1234 |
|
---|
1235 | rc = expr_var_unify_types(pThis, pVar1, pVar2, "<=");
|
---|
1236 | if (rc >= kExprRet_Ok)
|
---|
1237 | {
|
---|
1238 | if (!expr_var_is_string(pVar1))
|
---|
1239 | expr_var_assign_bool(pVar1, pVar1->uVal.i <= pVar2->uVal.i);
|
---|
1240 | else
|
---|
1241 | expr_var_assign_bool(pVar1, strcmp(pVar1->uVal.psz, pVar2->uVal.psz) <= 0);
|
---|
1242 | }
|
---|
1243 |
|
---|
1244 | expr_pop_and_delete_var(pThis);
|
---|
1245 | return rc;
|
---|
1246 | }
|
---|
1247 |
|
---|
1248 |
|
---|
1249 | /**
|
---|
1250 | * Less than.
|
---|
1251 | *
|
---|
1252 | * @returns Status code.
|
---|
1253 | * @param pThis The instance.
|
---|
1254 | */
|
---|
1255 | static EXPRRET expr_op_less_than(PEXPR pThis)
|
---|
1256 | {
|
---|
1257 | EXPRRET rc = kExprRet_Ok;
|
---|
1258 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1259 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1260 |
|
---|
1261 | rc = expr_var_unify_types(pThis, pVar1, pVar2, "<");
|
---|
1262 | if (rc >= kExprRet_Ok)
|
---|
1263 | {
|
---|
1264 | if (!expr_var_is_string(pVar1))
|
---|
1265 | expr_var_assign_bool(pVar1, pVar1->uVal.i < pVar2->uVal.i);
|
---|
1266 | else
|
---|
1267 | expr_var_assign_bool(pVar1, strcmp(pVar1->uVal.psz, pVar2->uVal.psz) < 0);
|
---|
1268 | }
|
---|
1269 |
|
---|
1270 | expr_pop_and_delete_var(pThis);
|
---|
1271 | return rc;
|
---|
1272 | }
|
---|
1273 |
|
---|
1274 |
|
---|
1275 | /**
|
---|
1276 | * Greater or equal than
|
---|
1277 | *
|
---|
1278 | * @returns Status code.
|
---|
1279 | * @param pThis The instance.
|
---|
1280 | */
|
---|
1281 | static EXPRRET expr_op_greater_or_equal_than(PEXPR pThis)
|
---|
1282 | {
|
---|
1283 | EXPRRET rc = kExprRet_Ok;
|
---|
1284 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1285 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1286 |
|
---|
1287 | rc = expr_var_unify_types(pThis, pVar1, pVar2, ">=");
|
---|
1288 | if (rc >= kExprRet_Ok)
|
---|
1289 | {
|
---|
1290 | if (!expr_var_is_string(pVar1))
|
---|
1291 | expr_var_assign_bool(pVar1, pVar1->uVal.i >= pVar2->uVal.i);
|
---|
1292 | else
|
---|
1293 | expr_var_assign_bool(pVar1, strcmp(pVar1->uVal.psz, pVar2->uVal.psz) >= 0);
|
---|
1294 | }
|
---|
1295 |
|
---|
1296 | expr_pop_and_delete_var(pThis);
|
---|
1297 | return rc;
|
---|
1298 | }
|
---|
1299 |
|
---|
1300 |
|
---|
1301 | /**
|
---|
1302 | * Greater than.
|
---|
1303 | *
|
---|
1304 | * @returns Status code.
|
---|
1305 | * @param pThis The instance.
|
---|
1306 | */
|
---|
1307 | static EXPRRET expr_op_greater_than(PEXPR pThis)
|
---|
1308 | {
|
---|
1309 | EXPRRET rc = kExprRet_Ok;
|
---|
1310 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1311 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1312 |
|
---|
1313 | rc = expr_var_unify_types(pThis, pVar1, pVar2, ">");
|
---|
1314 | if (rc >= kExprRet_Ok)
|
---|
1315 | {
|
---|
1316 | if (!expr_var_is_string(pVar1))
|
---|
1317 | expr_var_assign_bool(pVar1, pVar1->uVal.i > pVar2->uVal.i);
|
---|
1318 | else
|
---|
1319 | expr_var_assign_bool(pVar1, strcmp(pVar1->uVal.psz, pVar2->uVal.psz) > 0);
|
---|
1320 | }
|
---|
1321 |
|
---|
1322 | expr_pop_and_delete_var(pThis);
|
---|
1323 | return rc;
|
---|
1324 | }
|
---|
1325 |
|
---|
1326 |
|
---|
1327 | /**
|
---|
1328 | * Equal.
|
---|
1329 | *
|
---|
1330 | * @returns Status code.
|
---|
1331 | * @param pThis The instance.
|
---|
1332 | */
|
---|
1333 | static EXPRRET expr_op_equal(PEXPR pThis)
|
---|
1334 | {
|
---|
1335 | EXPRRET rc = kExprRet_Ok;
|
---|
1336 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1337 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1338 |
|
---|
1339 | /*
|
---|
1340 | * The same type?
|
---|
1341 | */
|
---|
1342 | if (expr_var_is_string(pVar1) == expr_var_is_string(pVar2))
|
---|
1343 | {
|
---|
1344 | if (!expr_var_is_string(pVar1))
|
---|
1345 | /* numbers are simple */
|
---|
1346 | expr_var_assign_bool(pVar1, pVar1->uVal.i == pVar2->uVal.i);
|
---|
1347 | else
|
---|
1348 | {
|
---|
1349 | /* try a normal string compare. */
|
---|
1350 | expr_var_make_simple_string(pVar1);
|
---|
1351 | expr_var_make_simple_string(pVar2);
|
---|
1352 | if (!strcmp(pVar1->uVal.psz, pVar2->uVal.psz))
|
---|
1353 | expr_var_assign_bool(pVar1, 1);
|
---|
1354 | /* try convert and compare as number instead. */
|
---|
1355 | else if ( expr_var_try_make_num(pVar1) >= kExprRet_Ok
|
---|
1356 | && expr_var_try_make_num(pVar2) >= kExprRet_Ok)
|
---|
1357 | expr_var_assign_bool(pVar1, pVar1->uVal.i == pVar2->uVal.i);
|
---|
1358 | /* ok, they really aren't equal. */
|
---|
1359 | else
|
---|
1360 | expr_var_assign_bool(pVar1, 0);
|
---|
1361 | }
|
---|
1362 | }
|
---|
1363 | else
|
---|
1364 | {
|
---|
1365 | /*
|
---|
1366 | * If the type differs, there are now two options:
|
---|
1367 | * 1. Convert the string to a valid number and compare the numbers.
|
---|
1368 | * 2. Convert an empty string to a 'false' boolean value and compare
|
---|
1369 | * numerically. This one is a bit questionable, so we don't try this.
|
---|
1370 | */
|
---|
1371 | if ( expr_var_try_make_num(pVar1) >= kExprRet_Ok
|
---|
1372 | && expr_var_try_make_num(pVar2) >= kExprRet_Ok)
|
---|
1373 | expr_var_assign_bool(pVar1, pVar1->uVal.i == pVar2->uVal.i);
|
---|
1374 | else
|
---|
1375 | {
|
---|
1376 | expr_error(pThis, "Cannot compare strings and numbers");
|
---|
1377 | rc = kExprRet_Error;
|
---|
1378 | }
|
---|
1379 | }
|
---|
1380 |
|
---|
1381 | expr_pop_and_delete_var(pThis);
|
---|
1382 | return kExprRet_Ok;
|
---|
1383 | }
|
---|
1384 |
|
---|
1385 |
|
---|
1386 | /**
|
---|
1387 | * Not equal.
|
---|
1388 | *
|
---|
1389 | * @returns Status code.
|
---|
1390 | * @param pThis The instance.
|
---|
1391 | */
|
---|
1392 | static EXPRRET expr_op_not_equal(PEXPR pThis)
|
---|
1393 | {
|
---|
1394 | EXPRRET rc = expr_op_equal(pThis);
|
---|
1395 | if (rc >= kExprRet_Ok)
|
---|
1396 | rc = expr_op_logical_not(pThis);
|
---|
1397 | return rc;
|
---|
1398 | }
|
---|
1399 |
|
---|
1400 |
|
---|
1401 | /**
|
---|
1402 | * Bitwise AND.
|
---|
1403 | *
|
---|
1404 | * @returns Status code.
|
---|
1405 | * @param pThis The instance.
|
---|
1406 | */
|
---|
1407 | static EXPRRET expr_op_bitwise_and(PEXPR pThis)
|
---|
1408 | {
|
---|
1409 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1410 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1411 | EXPRRET rc;
|
---|
1412 |
|
---|
1413 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1414 | if (rc >= kExprRet_Ok)
|
---|
1415 | {
|
---|
1416 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1417 | if (rc >= kExprRet_Ok)
|
---|
1418 | pVar1->uVal.i &= pVar2->uVal.i;
|
---|
1419 | }
|
---|
1420 |
|
---|
1421 | expr_pop_and_delete_var(pThis);
|
---|
1422 | return kExprRet_Ok;
|
---|
1423 | }
|
---|
1424 |
|
---|
1425 |
|
---|
1426 | /**
|
---|
1427 | * Bitwise XOR.
|
---|
1428 | *
|
---|
1429 | * @returns Status code.
|
---|
1430 | * @param pThis The instance.
|
---|
1431 | */
|
---|
1432 | static EXPRRET expr_op_bitwise_xor(PEXPR pThis)
|
---|
1433 | {
|
---|
1434 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1435 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1436 | EXPRRET rc;
|
---|
1437 |
|
---|
1438 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1439 | if (rc >= kExprRet_Ok)
|
---|
1440 | {
|
---|
1441 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1442 | if (rc >= kExprRet_Ok)
|
---|
1443 | pVar1->uVal.i ^= pVar2->uVal.i;
|
---|
1444 | }
|
---|
1445 |
|
---|
1446 | expr_pop_and_delete_var(pThis);
|
---|
1447 | return kExprRet_Ok;
|
---|
1448 | }
|
---|
1449 |
|
---|
1450 |
|
---|
1451 | /**
|
---|
1452 | * Bitwise OR.
|
---|
1453 | *
|
---|
1454 | * @returns Status code.
|
---|
1455 | * @param pThis The instance.
|
---|
1456 | */
|
---|
1457 | static EXPRRET expr_op_bitwise_or(PEXPR pThis)
|
---|
1458 | {
|
---|
1459 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1460 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1461 | EXPRRET rc;
|
---|
1462 |
|
---|
1463 | rc = expr_var_make_num(pThis, pVar1);
|
---|
1464 | if (rc >= kExprRet_Ok)
|
---|
1465 | {
|
---|
1466 | rc = expr_var_make_num(pThis, pVar2);
|
---|
1467 | if (rc >= kExprRet_Ok)
|
---|
1468 | pVar1->uVal.i |= pVar2->uVal.i;
|
---|
1469 | }
|
---|
1470 |
|
---|
1471 | expr_pop_and_delete_var(pThis);
|
---|
1472 | return kExprRet_Ok;
|
---|
1473 | }
|
---|
1474 |
|
---|
1475 |
|
---|
1476 | /**
|
---|
1477 | * Logical AND.
|
---|
1478 | *
|
---|
1479 | * @returns Status code.
|
---|
1480 | * @param pThis The instance.
|
---|
1481 | */
|
---|
1482 | static EXPRRET expr_op_logical_and(PEXPR pThis)
|
---|
1483 | {
|
---|
1484 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1485 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1486 |
|
---|
1487 | if ( expr_var_make_bool(pVar1)
|
---|
1488 | && expr_var_make_bool(pVar2))
|
---|
1489 | expr_var_assign_bool(pVar1, 1);
|
---|
1490 | else
|
---|
1491 | expr_var_assign_bool(pVar1, 0);
|
---|
1492 |
|
---|
1493 | expr_pop_and_delete_var(pThis);
|
---|
1494 | return kExprRet_Ok;
|
---|
1495 | }
|
---|
1496 |
|
---|
1497 |
|
---|
1498 | /**
|
---|
1499 | * Logical OR.
|
---|
1500 | *
|
---|
1501 | * @returns Status code.
|
---|
1502 | * @param pThis The instance.
|
---|
1503 | */
|
---|
1504 | static EXPRRET expr_op_logical_or(PEXPR pThis)
|
---|
1505 | {
|
---|
1506 | PEXPRVAR pVar1 = &pThis->aVars[pThis->iVar - 1];
|
---|
1507 | PEXPRVAR pVar2 = &pThis->aVars[pThis->iVar];
|
---|
1508 |
|
---|
1509 | if ( expr_var_make_bool(pVar1)
|
---|
1510 | || expr_var_make_bool(pVar2))
|
---|
1511 | expr_var_assign_bool(pVar1, 1);
|
---|
1512 | else
|
---|
1513 | expr_var_assign_bool(pVar1, 0);
|
---|
1514 |
|
---|
1515 | expr_pop_and_delete_var(pThis);
|
---|
1516 | return kExprRet_Ok;
|
---|
1517 | }
|
---|
1518 |
|
---|
1519 |
|
---|
1520 | /**
|
---|
1521 | * Left parenthesis.
|
---|
1522 | *
|
---|
1523 | * @returns Status code.
|
---|
1524 | * @param pThis The instance.
|
---|
1525 | */
|
---|
1526 | static EXPRRET expr_op_left_parenthesis(PEXPR pThis)
|
---|
1527 | {
|
---|
1528 | /*
|
---|
1529 | * There should be a right parenthesis operator lined up for us now,
|
---|
1530 | * eat it. If not found there is an inbalance.
|
---|
1531 | */
|
---|
1532 | EXPRRET rc = expr_get_binary_or_eoe_or_rparen(pThis);
|
---|
1533 | if ( rc == kExprRet_Operator
|
---|
1534 | && pThis->apOps[pThis->iOp]->szOp[0] == ')')
|
---|
1535 | {
|
---|
1536 | /* pop it and get another one which we can leave pending. */
|
---|
1537 | pThis->iOp--;
|
---|
1538 | rc = expr_get_binary_or_eoe_or_rparen(pThis);
|
---|
1539 | if (rc >= kExprRet_Ok)
|
---|
1540 | expr_unget_op(pThis);
|
---|
1541 | }
|
---|
1542 | else
|
---|
1543 | {
|
---|
1544 | expr_error(pThis, "Missing ')'");
|
---|
1545 | rc = kExprRet_Error;
|
---|
1546 | }
|
---|
1547 |
|
---|
1548 | return rc;
|
---|
1549 | }
|
---|
1550 |
|
---|
1551 |
|
---|
1552 | /**
|
---|
1553 | * Right parenthesis, dummy that's never actually called.
|
---|
1554 | *
|
---|
1555 | * @returns Status code.
|
---|
1556 | * @param pThis The instance.
|
---|
1557 | */
|
---|
1558 | static EXPRRET expr_op_right_parenthesis(PEXPR pThis)
|
---|
1559 | {
|
---|
1560 | assert(0);
|
---|
1561 | (void)pThis;
|
---|
1562 | return kExprRet_Ok;
|
---|
1563 | }
|
---|
1564 |
|
---|
1565 |
|
---|
1566 |
|
---|
1567 |
|
---|
1568 |
|
---|
1569 | /**
|
---|
1570 | * The operator table.
|
---|
1571 | *
|
---|
1572 | * This table is NOT ordered by precedence, but for linear search
|
---|
1573 | * allowing for first match to return the correct operator. This
|
---|
1574 | * means that || must come before |, or else | will match all.
|
---|
1575 | */
|
---|
1576 | static const EXPROP g_aExprOps[] =
|
---|
1577 | {
|
---|
1578 | #define EXPR_OP(szOp, iPrecedence, cArgs, pfn) { szOp, sizeof(szOp) - 1, '\0', iPrecedence, cArgs, pfn }
|
---|
1579 | /* Name, iPrecedence, cArgs, pfn */
|
---|
1580 | EXPR_OP("defined", 90, 1, expr_op_defined),
|
---|
1581 | EXPR_OP("target", 90, 1, expr_op_target),
|
---|
1582 | EXPR_OP("bool", 90, 1, expr_op_bool),
|
---|
1583 | EXPR_OP("num", 90, 1, expr_op_num),
|
---|
1584 | EXPR_OP("str", 90, 1, expr_op_str),
|
---|
1585 | EXPR_OP("+", 80, 1, expr_op_pluss),
|
---|
1586 | EXPR_OP("-", 80, 1, expr_op_minus),
|
---|
1587 | EXPR_OP("~", 80, 1, expr_op_bitwise_not),
|
---|
1588 | EXPR_OP("*", 75, 2, expr_op_multiply),
|
---|
1589 | EXPR_OP("/", 75, 2, expr_op_divide),
|
---|
1590 | EXPR_OP("%", 75, 2, expr_op_modulus),
|
---|
1591 | EXPR_OP("+", 70, 2, expr_op_add),
|
---|
1592 | EXPR_OP("-", 70, 2, expr_op_sub),
|
---|
1593 | EXPR_OP("<<", 65, 2, expr_op_shift_left),
|
---|
1594 | EXPR_OP(">>", 65, 2, expr_op_shift_right),
|
---|
1595 | EXPR_OP("<=", 60, 2, expr_op_less_or_equal_than),
|
---|
1596 | EXPR_OP("<", 60, 2, expr_op_less_than),
|
---|
1597 | EXPR_OP(">=", 60, 2, expr_op_greater_or_equal_than),
|
---|
1598 | EXPR_OP(">", 60, 2, expr_op_greater_than),
|
---|
1599 | EXPR_OP("==", 55, 2, expr_op_equal),
|
---|
1600 | EXPR_OP("!=", 55, 2, expr_op_not_equal),
|
---|
1601 | EXPR_OP("!", 80, 1, expr_op_logical_not),
|
---|
1602 | EXPR_OP("^", 45, 2, expr_op_bitwise_xor),
|
---|
1603 | EXPR_OP("&&", 35, 2, expr_op_logical_and),
|
---|
1604 | EXPR_OP("&", 50, 2, expr_op_bitwise_and),
|
---|
1605 | EXPR_OP("||", 30, 2, expr_op_logical_or),
|
---|
1606 | EXPR_OP("|", 40, 2, expr_op_bitwise_or),
|
---|
1607 | { "(", 1, ')', 10, 1, expr_op_left_parenthesis },
|
---|
1608 | { ")", 1, '(', 10, 0, expr_op_right_parenthesis },
|
---|
1609 | /* { "?", 1, ':', 5, 2, expr_op_question },
|
---|
1610 | { ":", 1, '?', 5, 2, expr_op_colon }, -- too weird for now. */
|
---|
1611 | #undef EXPR_OP
|
---|
1612 | };
|
---|
1613 |
|
---|
1614 | /** Dummy end of expression fake. */
|
---|
1615 | static const EXPROP g_ExprEndOfExpOp =
|
---|
1616 | {
|
---|
1617 | "", 0, '\0', 0, 0, NULL
|
---|
1618 | };
|
---|
1619 |
|
---|
1620 |
|
---|
1621 | /**
|
---|
1622 | * Initializes the opcode character map if necessary.
|
---|
1623 | */
|
---|
1624 | static void expr_map_init(void)
|
---|
1625 | {
|
---|
1626 | unsigned i;
|
---|
1627 | if (g_fExprInitializedMap)
|
---|
1628 | return;
|
---|
1629 |
|
---|
1630 | /*
|
---|
1631 | * Initialize it.
|
---|
1632 | */
|
---|
1633 | memset(&g_auchOpStartCharMap, 0, sizeof(g_auchOpStartCharMap));
|
---|
1634 | for (i = 0; i < sizeof(g_aExprOps) / sizeof(g_aExprOps[0]); i++)
|
---|
1635 | {
|
---|
1636 | unsigned int ch = (unsigned int)g_aExprOps[i].szOp[0];
|
---|
1637 | if (!g_auchOpStartCharMap[ch])
|
---|
1638 | g_auchOpStartCharMap[ch] = (i << 1) | 1;
|
---|
1639 | }
|
---|
1640 |
|
---|
1641 | g_fExprInitializedMap = 1;
|
---|
1642 | }
|
---|
1643 |
|
---|
1644 |
|
---|
1645 | /**
|
---|
1646 | * Looks up a character in the map.
|
---|
1647 | *
|
---|
1648 | * @returns the value for that char.
|
---|
1649 | * @retval 0 if not a potential opcode start char.
|
---|
1650 | * @retval non-zero if it's a potential operator. The low bit is always set
|
---|
1651 | * while the remaining 7 bits is the index into the operator table
|
---|
1652 | * of the first match.
|
---|
1653 | *
|
---|
1654 | * @param ch The character.
|
---|
1655 | */
|
---|
1656 | static unsigned char expr_map_get(char ch)
|
---|
1657 | {
|
---|
1658 | return g_auchOpStartCharMap[(unsigned int)ch];
|
---|
1659 | }
|
---|
1660 |
|
---|
1661 |
|
---|
1662 | /**
|
---|
1663 | * Searches the operator table given a potential operator start char.
|
---|
1664 | *
|
---|
1665 | * @returns Pointer to the matching operator. NULL if not found.
|
---|
1666 | * @param psz Pointer to what can be an operator.
|
---|
1667 | * @param uchVal The expr_map_get value.
|
---|
1668 | * @param fUnary Whether it must be an unary operator or not.
|
---|
1669 | */
|
---|
1670 | static PCEXPROP expr_lookup_op(char const *psz, unsigned char uchVal, int fUnary)
|
---|
1671 | {
|
---|
1672 | char ch = *psz;
|
---|
1673 | unsigned i;
|
---|
1674 |
|
---|
1675 | for (i = uchVal >> 1; i < sizeof(g_aExprOps) / sizeof(g_aExprOps[0]); i++)
|
---|
1676 | {
|
---|
1677 | /* compare the string... */
|
---|
1678 | switch (g_aExprOps[i].cchOp)
|
---|
1679 | {
|
---|
1680 | case 1:
|
---|
1681 | if (g_aExprOps[i].szOp[0] != ch)
|
---|
1682 | continue;
|
---|
1683 | break;
|
---|
1684 | case 2:
|
---|
1685 | if ( g_aExprOps[i].szOp[0] != ch
|
---|
1686 | || g_aExprOps[i].szOp[1] != psz[1])
|
---|
1687 | continue;
|
---|
1688 | break;
|
---|
1689 | default:
|
---|
1690 | if ( g_aExprOps[i].szOp[0] != ch
|
---|
1691 | || strncmp(&g_aExprOps[i].szOp[1], psz + 1, g_aExprOps[i].cchOp - 1))
|
---|
1692 | continue;
|
---|
1693 | break;
|
---|
1694 | }
|
---|
1695 |
|
---|
1696 | /* ... and the operator type. */
|
---|
1697 | if (fUnary == (g_aExprOps[i].cArgs == 1))
|
---|
1698 | {
|
---|
1699 | /* got a match! */
|
---|
1700 | return &g_aExprOps[i];
|
---|
1701 | }
|
---|
1702 | }
|
---|
1703 |
|
---|
1704 | return NULL;
|
---|
1705 | }
|
---|
1706 |
|
---|
1707 |
|
---|
1708 | /**
|
---|
1709 | * Ungets a binary operator.
|
---|
1710 | *
|
---|
1711 | * The operator is poped from the stack and put in the pending position.
|
---|
1712 | *
|
---|
1713 | * @param pThis The evaluator instance.
|
---|
1714 | */
|
---|
1715 | static void expr_unget_op(PEXPR pThis)
|
---|
1716 | {
|
---|
1717 | assert(pThis->pPending == NULL);
|
---|
1718 | assert(pThis->iOp >= 0);
|
---|
1719 |
|
---|
1720 | pThis->pPending = pThis->apOps[pThis->iOp];
|
---|
1721 | pThis->apOps[pThis->iOp] = NULL;
|
---|
1722 | pThis->iOp--;
|
---|
1723 | }
|
---|
1724 |
|
---|
1725 |
|
---|
1726 |
|
---|
1727 | /**
|
---|
1728 | * Get the next token, it should be a binary operator, or the end of
|
---|
1729 | * the expression, or a right parenthesis.
|
---|
1730 | *
|
---|
1731 | * The operator is pushed onto the stack and the status code indicates
|
---|
1732 | * which of the two we found.
|
---|
1733 | *
|
---|
1734 | * @returns status code. Will grumble on failure.
|
---|
1735 | * @retval kExprRet_EndOfExpr if we encountered the end of the expression.
|
---|
1736 | * @retval kExprRet_Operator if we encountered a binary operator or right
|
---|
1737 | * parenthesis. It's on the operator stack.
|
---|
1738 | *
|
---|
1739 | * @param pThis The evaluator instance.
|
---|
1740 | */
|
---|
1741 | static EXPRRET expr_get_binary_or_eoe_or_rparen(PEXPR pThis)
|
---|
1742 | {
|
---|
1743 | /*
|
---|
1744 | * See if there is anything pending first.
|
---|
1745 | */
|
---|
1746 | PCEXPROP pOp = pThis->pPending;
|
---|
1747 | if (pOp)
|
---|
1748 | pThis->pPending = NULL;
|
---|
1749 | else
|
---|
1750 | {
|
---|
1751 | /*
|
---|
1752 | * Eat more of the expression.
|
---|
1753 | */
|
---|
1754 | char const *psz = pThis->psz;
|
---|
1755 |
|
---|
1756 | /* spaces */
|
---|
1757 | while (isspace((unsigned int)*psz))
|
---|
1758 | psz++;
|
---|
1759 | /* see what we've got. */
|
---|
1760 | if (*psz)
|
---|
1761 | {
|
---|
1762 | unsigned char uchVal = expr_map_get(*psz);
|
---|
1763 | if (uchVal)
|
---|
1764 | pOp = expr_lookup_op(psz, uchVal, 0 /* fUnary */);
|
---|
1765 | if (!pOp)
|
---|
1766 | {
|
---|
1767 | expr_error(pThis, "Expected binary operator, found \"%.42s\"...", psz);
|
---|
1768 | return kExprRet_Error;
|
---|
1769 | }
|
---|
1770 | psz += pOp->cchOp;
|
---|
1771 | }
|
---|
1772 | else
|
---|
1773 | pOp = &g_ExprEndOfExpOp;
|
---|
1774 | pThis->psz = psz;
|
---|
1775 | }
|
---|
1776 |
|
---|
1777 | /*
|
---|
1778 | * Push it.
|
---|
1779 | */
|
---|
1780 | if (pThis->iOp >= EXPR_MAX_OPERATORS - 1)
|
---|
1781 | {
|
---|
1782 | expr_error(pThis, "Operator stack overflow");
|
---|
1783 | return kExprRet_Error;
|
---|
1784 | }
|
---|
1785 | pThis->apOps[++pThis->iOp] = pOp;
|
---|
1786 |
|
---|
1787 | return pOp->iPrecedence
|
---|
1788 | ? kExprRet_Operator
|
---|
1789 | : kExprRet_EndOfExpr;
|
---|
1790 | }
|
---|
1791 |
|
---|
1792 |
|
---|
1793 |
|
---|
1794 | /**
|
---|
1795 | * Get the next token, it should be an unary operator or an operand.
|
---|
1796 | *
|
---|
1797 | * This will fail if encountering the end of the expression since
|
---|
1798 | * it is implied that there should be something more.
|
---|
1799 | *
|
---|
1800 | * The token is pushed onto the respective stack and the status code
|
---|
1801 | * indicates which it is.
|
---|
1802 | *
|
---|
1803 | * @returns status code. On failure we'll be done bitching already.
|
---|
1804 | * @retval kExprRet_Operator if we encountered an unary operator.
|
---|
1805 | * It's on the operator stack.
|
---|
1806 | * @retval kExprRet_Operand if we encountered an operand operator.
|
---|
1807 | * It's on the operand stack.
|
---|
1808 | *
|
---|
1809 | * @param This The evaluator instance.
|
---|
1810 | */
|
---|
1811 | static EXPRRET expr_get_unary_or_operand(PEXPR pThis)
|
---|
1812 | {
|
---|
1813 | EXPRRET rc;
|
---|
1814 | unsigned char uchVal;
|
---|
1815 | PCEXPROP pOp;
|
---|
1816 | char const *psz = pThis->psz;
|
---|
1817 |
|
---|
1818 | /*
|
---|
1819 | * Eat white space and make sure there is something after it.
|
---|
1820 | */
|
---|
1821 | while (isspace((unsigned int)*psz))
|
---|
1822 | psz++;
|
---|
1823 | if (!*psz)
|
---|
1824 | {
|
---|
1825 | expr_error(pThis, "Unexpected end of expression");
|
---|
1826 | return kExprRet_Error;
|
---|
1827 | }
|
---|
1828 |
|
---|
1829 | /*
|
---|
1830 | * Is it an operator?
|
---|
1831 | */
|
---|
1832 | pOp = NULL;
|
---|
1833 | uchVal = expr_map_get(*psz);
|
---|
1834 | if (uchVal)
|
---|
1835 | pOp = expr_lookup_op(psz, uchVal, 1 /* fUnary */);
|
---|
1836 | if (pOp)
|
---|
1837 | {
|
---|
1838 | /*
|
---|
1839 | * Push the operator onto the stack.
|
---|
1840 | */
|
---|
1841 | if (pThis->iVar < EXPR_MAX_OPERANDS - 1)
|
---|
1842 | {
|
---|
1843 | pThis->apOps[++pThis->iOp] = pOp;
|
---|
1844 | rc = kExprRet_Operator;
|
---|
1845 | }
|
---|
1846 | else
|
---|
1847 | {
|
---|
1848 | expr_error(pThis, "Operator stack overflow");
|
---|
1849 | rc = kExprRet_Error;
|
---|
1850 | }
|
---|
1851 | psz += pOp->cchOp;
|
---|
1852 | }
|
---|
1853 | else if (pThis->iVar < EXPR_MAX_OPERANDS - 1)
|
---|
1854 | {
|
---|
1855 | /*
|
---|
1856 | * It's an operand. Figure out where it ends and
|
---|
1857 | * push it onto the stack.
|
---|
1858 | */
|
---|
1859 | const char *pszStart;
|
---|
1860 |
|
---|
1861 | rc = kExprRet_Ok;
|
---|
1862 | if (*psz == '"')
|
---|
1863 | {
|
---|
1864 | pszStart = ++psz;
|
---|
1865 | while (*psz && *psz != '"')
|
---|
1866 | psz++;
|
---|
1867 | expr_var_init_substring(&pThis->aVars[++pThis->iVar], pszStart, psz - pszStart, kExprVar_QuotedString);
|
---|
1868 | if (*psz)
|
---|
1869 | psz++;
|
---|
1870 | }
|
---|
1871 | else if (*psz == '\'')
|
---|
1872 | {
|
---|
1873 | pszStart = ++psz;
|
---|
1874 | while (*psz && *psz != '\'')
|
---|
1875 | psz++;
|
---|
1876 | expr_var_init_substring(&pThis->aVars[++pThis->iVar], pszStart, psz - pszStart, kExprVar_QuotedSimpleString);
|
---|
1877 | if (*psz)
|
---|
1878 | psz++;
|
---|
1879 | }
|
---|
1880 | else
|
---|
1881 | {
|
---|
1882 | char achPars[20];
|
---|
1883 | int iPar = -1;
|
---|
1884 | char chEndPar = '\0';
|
---|
1885 | char ch;
|
---|
1886 |
|
---|
1887 | pszStart = psz;
|
---|
1888 | while ((ch = *psz) != '\0')
|
---|
1889 | {
|
---|
1890 | /* $(adsf) or ${asdf} needs special handling. */
|
---|
1891 | if ( ch == '$'
|
---|
1892 | && ( psz[1] == '('
|
---|
1893 | || psz[1] == '{'))
|
---|
1894 | {
|
---|
1895 | psz++;
|
---|
1896 | if (iPar > (int)(sizeof(achPars) / sizeof(achPars[0])))
|
---|
1897 | {
|
---|
1898 | expr_error(pThis, "Too deep nesting of variable expansions");
|
---|
1899 | rc = kExprRet_Error;
|
---|
1900 | break;
|
---|
1901 | }
|
---|
1902 | achPars[++iPar] = chEndPar = ch == '(' ? ')' : '}';
|
---|
1903 | }
|
---|
1904 | else if (ch == chEndPar)
|
---|
1905 | {
|
---|
1906 | iPar--;
|
---|
1907 | chEndPar = iPar >= 0 ? achPars[iPar] : '\0';
|
---|
1908 | }
|
---|
1909 | else if (!chEndPar)
|
---|
1910 | {
|
---|
1911 | /** @todo combine isspace and expr_map_get! */
|
---|
1912 | unsigned chVal = expr_map_get(ch);
|
---|
1913 | if (chVal)
|
---|
1914 | {
|
---|
1915 | PCEXPROP pOp = expr_lookup_op(psz, uchVal, 0 /* fUnary */);
|
---|
1916 | if (pOp)
|
---|
1917 | break;
|
---|
1918 | }
|
---|
1919 | if (isspace((unsigned char)ch))
|
---|
1920 | break;
|
---|
1921 | }
|
---|
1922 |
|
---|
1923 | /* next */
|
---|
1924 | psz++;
|
---|
1925 | }
|
---|
1926 |
|
---|
1927 | if (rc == kExprRet_Ok)
|
---|
1928 | expr_var_init_substring(&pThis->aVars[++pThis->iVar], pszStart, psz - pszStart, kExprVar_String);
|
---|
1929 | }
|
---|
1930 | }
|
---|
1931 | else
|
---|
1932 | {
|
---|
1933 | expr_error(pThis, "Operand stack overflow");
|
---|
1934 | rc = kExprRet_Error;
|
---|
1935 | }
|
---|
1936 | pThis->psz = psz;
|
---|
1937 |
|
---|
1938 | return rc;
|
---|
1939 | }
|
---|
1940 |
|
---|
1941 |
|
---|
1942 | /**
|
---|
1943 | * Evaluates the current expression.
|
---|
1944 | *
|
---|
1945 | * @returns status code.
|
---|
1946 | *
|
---|
1947 | * @param pThis The instance.
|
---|
1948 | */
|
---|
1949 | static EXPRRET expr_eval(PEXPR pThis)
|
---|
1950 | {
|
---|
1951 | EXPRRET rc;
|
---|
1952 | PCEXPROP pOp;
|
---|
1953 |
|
---|
1954 | /*
|
---|
1955 | * The main loop.
|
---|
1956 | */
|
---|
1957 | for (;;)
|
---|
1958 | {
|
---|
1959 | /*
|
---|
1960 | * Eat unary operators until we hit an operand.
|
---|
1961 | */
|
---|
1962 | do rc = expr_get_unary_or_operand(pThis);
|
---|
1963 | while (rc == kExprRet_Operator);
|
---|
1964 | if (rc < kExprRet_Error)
|
---|
1965 | break;
|
---|
1966 |
|
---|
1967 | /*
|
---|
1968 | * Look for a binary operator, right parenthesis or end of expression.
|
---|
1969 | */
|
---|
1970 | rc = expr_get_binary_or_eoe_or_rparen(pThis);
|
---|
1971 | if (rc < kExprRet_Error)
|
---|
1972 | break;
|
---|
1973 | expr_unget_op(pThis);
|
---|
1974 |
|
---|
1975 | /*
|
---|
1976 | * Pop operators and apply them.
|
---|
1977 | *
|
---|
1978 | * Parenthesis will be handed via precedence, where the left parenthesis
|
---|
1979 | * will go pop the right one and make another operator pending.
|
---|
1980 | */
|
---|
1981 | while ( pThis->iOp >= 0
|
---|
1982 | && pThis->apOps[pThis->iOp]->iPrecedence >= pThis->pPending->iPrecedence)
|
---|
1983 | {
|
---|
1984 | pOp = pThis->apOps[pThis->iOp--];
|
---|
1985 | assert(pThis->iVar + 1 >= pOp->cArgs);
|
---|
1986 | rc = pOp->pfn(pThis);
|
---|
1987 | if (rc < kExprRet_Error)
|
---|
1988 | break;
|
---|
1989 | }
|
---|
1990 | if (rc < kExprRet_Error)
|
---|
1991 | break;
|
---|
1992 |
|
---|
1993 | /*
|
---|
1994 | * Get the next binary operator or end of expression.
|
---|
1995 | * There should be no right parenthesis here.
|
---|
1996 | */
|
---|
1997 | rc = expr_get_binary_or_eoe_or_rparen(pThis);
|
---|
1998 | if (rc < kExprRet_Error)
|
---|
1999 | break;
|
---|
2000 | pOp = pThis->apOps[pThis->iOp];
|
---|
2001 | if (!pOp->iPrecedence)
|
---|
2002 | break; /* end of expression */
|
---|
2003 | if (!pOp->cArgs)
|
---|
2004 | {
|
---|
2005 | expr_error(pThis, "Unexpected \"%s\"", pOp->szOp);
|
---|
2006 | rc = kExprRet_Error;
|
---|
2007 | break;
|
---|
2008 | }
|
---|
2009 | }
|
---|
2010 |
|
---|
2011 | return rc;
|
---|
2012 | }
|
---|
2013 |
|
---|
2014 |
|
---|
2015 | /**
|
---|
2016 | * Destroys the given instance.
|
---|
2017 | *
|
---|
2018 | * @param pThis The instance to destroy.
|
---|
2019 | */
|
---|
2020 | static void expr_destroy(PEXPR pThis)
|
---|
2021 | {
|
---|
2022 | while (pThis->iVar >= 0)
|
---|
2023 | {
|
---|
2024 | expr_var_delete(pThis->aVars);
|
---|
2025 | pThis->iVar--;
|
---|
2026 | }
|
---|
2027 | free(pThis);
|
---|
2028 | }
|
---|
2029 |
|
---|
2030 |
|
---|
2031 | /**
|
---|
2032 | * Instantiates an expression evaluator.
|
---|
2033 | *
|
---|
2034 | * @returns The instance.
|
---|
2035 | *
|
---|
2036 | * @param pszExpr What to parse.
|
---|
2037 | * This must stick around until expr_destroy.
|
---|
2038 | */
|
---|
2039 | static PEXPR expr_create(char const *pszExpr)
|
---|
2040 | {
|
---|
2041 | PEXPR pThis = (PEXPR)xmalloc(sizeof(*pThis));
|
---|
2042 | pThis->pszExpr = pszExpr;
|
---|
2043 | pThis->psz = pszExpr;
|
---|
2044 | pThis->pFileLoc = NULL;
|
---|
2045 | pThis->pPending = NULL;
|
---|
2046 | pThis->iVar = -1;
|
---|
2047 | pThis->iOp = -1;
|
---|
2048 |
|
---|
2049 | expr_map_init();
|
---|
2050 | return pThis;
|
---|
2051 | }
|
---|
2052 |
|
---|
2053 |
|
---|
2054 | /**
|
---|
2055 | * Evaluates the given if expression.
|
---|
2056 | *
|
---|
2057 | * @returns -1, 0 or 1.
|
---|
2058 | * @retval -1 if the expression is invalid.
|
---|
2059 | * @retval 0 if the expression is true
|
---|
2060 | * @retval 1 if the expression is false.
|
---|
2061 | *
|
---|
2062 | * @param line The expression. Can modify this as we like.
|
---|
2063 | * @param flocp The file location, used for errors.
|
---|
2064 | */
|
---|
2065 | int expr_eval_if_conditionals(char *line, const struct floc *flocp)
|
---|
2066 | {
|
---|
2067 | /*
|
---|
2068 | * Instantiate the expression evaluator and let
|
---|
2069 | * it have a go at it.
|
---|
2070 | */
|
---|
2071 | int rc = -1;
|
---|
2072 | PEXPR pExpr = expr_create(line);
|
---|
2073 | pExpr->pFileLoc = flocp;
|
---|
2074 | if (expr_eval(pExpr) >= kExprRet_Ok)
|
---|
2075 | {
|
---|
2076 | /*
|
---|
2077 | * Convert the result (on top of the stack) to boolean and
|
---|
2078 | * set our return value accordingly.
|
---|
2079 | */
|
---|
2080 | if (expr_var_make_bool(&pExpr->aVars[0]))
|
---|
2081 | rc = 0;
|
---|
2082 | else
|
---|
2083 | rc = 1;
|
---|
2084 | }
|
---|
2085 | expr_destroy(pExpr);
|
---|
2086 |
|
---|
2087 | return rc;
|
---|
2088 | }
|
---|
2089 |
|
---|
2090 |
|
---|
2091 | /**
|
---|
2092 | * Evaluates the given expression and returns the result as a string.
|
---|
2093 | *
|
---|
2094 | * @returns variable buffer position.
|
---|
2095 | *
|
---|
2096 | * @param o The current variable buffer position.
|
---|
2097 | * @param expr The expression.
|
---|
2098 | */
|
---|
2099 | char *expr_eval_to_string(char *o, char *expr)
|
---|
2100 | {
|
---|
2101 | /*
|
---|
2102 | * Instantiate the expression evaluator and let
|
---|
2103 | * it have a go at it.
|
---|
2104 | */
|
---|
2105 | PEXPR pExpr = expr_create(expr);
|
---|
2106 | if (expr_eval(pExpr) >= kExprRet_Ok)
|
---|
2107 | {
|
---|
2108 | /*
|
---|
2109 | * Convert the result (on top of the stack) to a string
|
---|
2110 | * and copy it out the variable buffer.
|
---|
2111 | */
|
---|
2112 | PEXPRVAR pVar = &pExpr->aVars[0];
|
---|
2113 | expr_var_make_simple_string(pVar);
|
---|
2114 | o = variable_buffer_output(o, pVar->uVal.psz, strlen(pVar->uVal.psz));
|
---|
2115 | }
|
---|
2116 | else
|
---|
2117 | o = variable_buffer_output(o, "<expression evaluation failed>", sizeof("<expression evaluation failed>") - 1);
|
---|
2118 | expr_destroy(pExpr);
|
---|
2119 |
|
---|
2120 | return o;
|
---|
2121 | }
|
---|
2122 |
|
---|
2123 |
|
---|
2124 | #endif /* CONFIG_WITH_IF_CONDITIONALS */
|
---|
2125 |
|
---|