1 | /*
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2 | * Copyright (c) 2010 Jiri Svoboda
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | *
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9 | * - Redistributions of source code must retain the above copyright
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10 | * notice, this list of conditions and the following disclaimer.
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11 | * - Redistributions in binary form must reproduce the above copyright
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12 | * notice, this list of conditions and the following disclaimer in the
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13 | * documentation and/or other materials provided with the distribution.
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14 | * - The name of the author may not be used to endorse or promote products
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15 | * derived from this software without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27 | */
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28 |
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29 | /** @file String builtin binding. */
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30 |
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31 | #include <stdio.h>
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32 | #include <stdlib.h>
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33 | #include <assert.h>
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34 | #include "../bigint.h"
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35 | #include "../builtin.h"
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36 | #include "../debug.h"
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37 | #include "../mytypes.h"
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38 | #include "../os/os.h"
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39 | #include "../rdata.h"
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40 | #include "../run.h"
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41 | #include "../strtab.h"
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42 |
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43 | #include "bi_string.h"
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44 |
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45 | static void bi_string_length(run_t *run);
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46 | static void bi_string_slice(run_t *run);
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47 |
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48 | /** Declare String builtin.
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49 | *
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50 | * @param bi Builtin object
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51 | */
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52 | void bi_string_declare(builtin_t *bi)
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53 | {
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54 | (void) bi;
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55 | }
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56 |
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57 | /** Bind String builtin.
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58 | *
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59 | * @param bi Builtin object
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60 | */
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61 | void bi_string_bind(builtin_t *bi)
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62 | {
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63 | builtin_fun_bind(bi, "String", "get_length", bi_string_length);
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64 | builtin_fun_bind(bi, "String", "Slice", bi_string_slice);
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65 | }
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66 |
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67 | /** Return length of the string.
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68 | *
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69 | * @param run Runner object
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70 | */
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71 | static void bi_string_length(run_t *run)
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72 | {
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73 | rdata_var_t *self_value_var;
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74 | const char *str;
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75 | size_t str_l;
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76 |
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77 | rdata_int_t *rint;
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78 | rdata_var_t *rvar;
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79 | rdata_value_t *rval;
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80 | rdata_item_t *ritem;
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81 |
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82 | run_proc_ar_t *proc_ar;
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83 |
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84 | /* Extract self.Value */
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85 | self_value_var = builtin_get_self_mbr_var(run, "Value");
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86 | assert(self_value_var->vc == vc_string);
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87 | str = self_value_var->u.string_v->value;
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88 | str_l = os_str_length(str);
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89 |
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90 | #ifdef DEBUG_RUN_TRACE
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91 | printf("Get length of string '%s'.\n", str);
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92 | #endif
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93 |
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94 | /* Construct return value. */
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95 | rint = rdata_int_new();
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96 | bigint_init(&rint->value, (int) str_l);
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97 |
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98 | rvar = rdata_var_new(vc_int);
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99 | rvar->u.int_v = rint;
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100 | rval = rdata_value_new();
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101 | rval->var = rvar;
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102 |
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103 | ritem = rdata_item_new(ic_value);
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104 | ritem->u.value = rval;
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105 |
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106 | proc_ar = run_get_current_proc_ar(run);
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107 | proc_ar->retval = ritem;
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108 | }
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109 |
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110 | /** Return slice (substring) of the string.
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111 | *
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112 | * @param run Runner object
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113 | */
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114 | static void bi_string_slice(run_t *run)
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115 | {
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116 | rdata_var_t *self_value_var;
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117 | const char *str;
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118 | const char *slice;
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119 | size_t str_l;
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120 |
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121 | rdata_var_t *start_var;
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122 | int start;
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123 |
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124 | rdata_var_t *length_var;
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125 | int length;
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126 |
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127 | errno_t rc;
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128 |
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129 | /* Extract self.Value */
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130 | self_value_var = builtin_get_self_mbr_var(run, "Value");
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131 | assert(self_value_var->vc == vc_string);
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132 | str = self_value_var->u.string_v->value;
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133 | str_l = os_str_length(str);
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134 |
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135 | /* Get argument @a start. */
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136 | start_var = run_local_vars_lookup(run, strtab_get_sid("start"));
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137 | assert(start_var);
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138 | assert(start_var->vc == vc_int);
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139 |
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140 | rc = bigint_get_value_int(&start_var->u.int_v->value, &start);
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141 | if (rc != EOK || start < 0 || (size_t) start > str_l) {
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142 | printf("Error: Parameter 'start' to Slice() out of range.\n");
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143 | exit(1);
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144 | }
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145 |
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146 | /* Get argument @a length. */
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147 | length_var = run_local_vars_lookup(run, strtab_get_sid("length"));
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148 | assert(length_var);
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149 | assert(length_var->vc == vc_int);
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150 |
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151 | rc = bigint_get_value_int(&length_var->u.int_v->value, &length);
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152 | if (rc != EOK || length < 0 || (size_t) (start + length) > str_l) {
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153 | printf("Error: Parameter 'length' to Slice() out of range.\n");
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154 | exit(1);
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155 | }
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156 |
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157 | #ifdef DEBUG_RUN_TRACE
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158 | printf("Construct Slice(%d, %d) from string '%s'.\n",
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159 | start, length, str);
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160 | #endif
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161 | slice = os_str_aslice(str, start, length);
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162 |
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163 | /* Ownership of slice is transferred. */
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164 | builtin_return_string(run, slice);
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165 | }
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