Mercurial > projects > pwm
annotate tok.c @ 42:fb995e5d54e9 version-1
Release version 1
author | Guido Berhoerster <guido+pwm@berhoerster.name> |
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date | Tue, 20 Aug 2019 21:26:55 +0200 |
parents | 722a45b4028b |
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1 /* |
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2 * Copyright (C) 2017 Guido Berhoerster <guido+pwm@berhoerster.name> |
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3 * |
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4 * Permission is hereby granted, free of charge, to any person obtaining |
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5 * a copy of this software and associated documentation files (the |
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6 * "Software"), to deal in the Software without restriction, including |
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7 * without limitation the rights to use, copy, modify, merge, publish, |
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8 * distribute, sublicense, and/or sell copies of the Software, and to |
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9 * permit persons to whom the Software is furnished to do so, subject to |
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10 * the following conditions: |
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11 * |
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12 * The above copyright notice and this permission notice shall be included |
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13 * in all copies or substantial portions of the Software. |
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14 * |
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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22 */ |
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23 |
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24 #include "compat.h" |
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25 |
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26 #include <ctype.h> |
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27 #include <stdio.h> |
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28 #include <stdlib.h> |
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29 #include <string.h> |
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30 |
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31 #include "tok.h" |
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32 #include "util.h" |
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33 |
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34 enum tok_states { |
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35 STATE_INITIAL, |
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36 STATE_IN_WORD, |
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37 STATE_IN_QUOTE, |
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38 STATE_IN_WORD_ESCAPE, |
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39 STATE_IN_QUOTE_ESCAPE, |
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40 STATE_IN_MACRO |
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41 }; |
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42 |
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43 static inline void |
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44 strbuf_appendc(char **bufp, size_t *buf_sizep, int c) |
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45 { |
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46 char *buf = *bufp; |
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47 size_t buf_size = *buf_sizep; |
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48 size_t len; |
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49 |
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50 len = ((buf != NULL) && (c >= 0)) ? strlen(buf) : 0; |
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51 |
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52 /* allocate buffer if *bufp is NULL and *buf_sizep is 0 */ |
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53 if (buf_size < len + (c >= 0) + 1) { |
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54 buf_size = (buf_size * 2 > BUFSIZ) ? buf_size * 2 : BUFSIZ; |
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55 buf = xrealloc(buf, buf_size); |
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56 } |
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57 |
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58 /* append character to string buffer or reset buffer if c is -1 */ |
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59 if (c >= 0) { |
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60 buf[len++] = c; |
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61 } |
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62 buf[len] = '\0'; |
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63 |
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64 *bufp = buf; |
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65 *buf_sizep = buf_size; |
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66 } |
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67 |
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68 void |
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69 tok_free(union tok **tokenv) |
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70 { |
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71 size_t i; |
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72 |
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73 if (tokenv == NULL) { |
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74 return; |
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75 } |
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76 |
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77 for (i = 0; tokenv[i] != NULL; i++) { |
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78 switch (tokenv[i]->any.type) { |
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79 case TOK_MACRO: |
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80 free(tokenv[i]->macro.name); |
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81 break; |
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82 case TOK_ARG: |
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83 free(tokenv[i]->arg.value); |
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84 break; |
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85 } |
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86 free(tokenv[i]); |
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87 } |
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88 free(tokenv); |
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89 } |
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90 |
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91 enum tok_err |
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92 tok_tokenize(const char *s, size_t *tokencp, union tok ***tokenvp) |
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93 { |
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94 int retval = TOK_ERR_OK; |
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95 union tok **tokenv; |
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96 size_t tokenc = 0; |
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97 const char *p = s; |
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98 enum tok_states state = STATE_INITIAL; |
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99 char quote; |
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100 char *buf = NULL; |
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101 size_t buf_size = 0; |
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102 char *value; |
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103 char *name; |
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104 |
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105 /* allocate maximum number of tokens: ceil(length / 2) */ |
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106 tokenv = xmalloc((((strlen(s) + 2 - 1) / 2) + 1) * |
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107 sizeof (union tok *)); |
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108 |
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109 for (;;) { |
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110 switch (state) { |
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111 case STATE_INITIAL: |
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112 switch (*p) { |
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113 case ' ': /* FALLTHROUGH */ |
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114 case '\t': /* FALLTHROUGH */ |
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115 case '\n': |
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116 /* skip initial whitespace */ |
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117 break; |
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118 case '"': /* FALLTHROUGH */ |
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119 case '\'': |
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120 /* start quoted part of token */ |
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121 state = STATE_IN_QUOTE; |
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122 quote = *p; |
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123 strbuf_appendc(&buf, &buf_size, -1); |
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124 break; |
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Initial revision
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125 case '\\': |
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126 /* start token with a backslash escape */ |
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127 state = STATE_IN_WORD_ESCAPE; |
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128 strbuf_appendc(&buf, &buf_size, -1); |
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129 break; |
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130 case '$': |
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131 /* start macro token */ |
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132 state = STATE_IN_MACRO; |
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Add define command for defining macros
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133 strbuf_appendc(&buf, &buf_size, -1); |
0
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134 break; |
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135 case '\0': |
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136 /* end of input */ |
27
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137 retval = TOK_ERR_OK; |
0
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138 goto out; |
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parents:
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139 default: |
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140 /* start token with a word */ |
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141 state = STATE_IN_WORD; |
27
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142 strbuf_appendc(&buf, &buf_size, -1); |
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143 strbuf_appendc(&buf, &buf_size, *p); |
0
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Initial revision
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144 } |
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145 break; |
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146 case STATE_IN_WORD: |
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147 switch (*p) { |
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148 case ' ': /* FALLTHROUGH */ |
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149 case '\t': /* FALLTHROUGH */ |
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150 case '\n': /* FALLTHROUGH */ |
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151 case '\0': |
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152 /* end of token */ |
27
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153 value = xstrdup(buf); |
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154 tokenv[tokenc] = xmalloc(sizeof (union tok)); |
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155 tokenv[tokenc]->arg.type = TOK_ARG; |
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156 tokenv[tokenc]->arg.value = value; |
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157 tokenc++; |
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158 |
0
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159 if (*p == '\0') { |
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160 retval = TOK_ERR_OK; |
0
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Initial revision
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|
161 goto out; |
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Initial revision
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|
162 } |
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|
163 state = STATE_INITIAL; |
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|
164 break; |
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165 case '"': /* FALLTHROUGH */ |
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166 case '\'': |
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167 /* start quoted part of token */ |
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168 state = STATE_IN_QUOTE; |
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Initial revision
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|
169 quote = *p; |
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170 break; |
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Initial revision
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|
171 case '\\': |
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|
172 /* start backslash escape */ |
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173 state = STATE_IN_WORD_ESCAPE; |
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Initial revision
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|
174 break; |
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Initial revision
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|
175 default: |
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176 /* regular character */ |
27
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|
177 strbuf_appendc(&buf, &buf_size, *p); |
0
a7e41e1a79c8
Initial revision
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178 } |
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Initial revision
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179 break; |
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|
180 case STATE_IN_QUOTE: |
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|
181 switch (*p) { |
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Initial revision
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|
182 case '"': /* FALLTHROUGH */ |
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Initial revision
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diff
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|
183 case '\'': |
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|
184 if (*p == quote) { |
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|
185 /* end quoted part of token */ |
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Initial revision
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|
186 state = STATE_IN_WORD; |
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Initial revision
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|
187 } else { |
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188 /* quote quote character */ |
27
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|
189 strbuf_appendc(&buf, &buf_size, *p); |
0
a7e41e1a79c8
Initial revision
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|
190 } |
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Initial revision
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|
191 break; |
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Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
192 case '\\': |
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parents:
diff
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|
193 /* start quoted backslash escape */ |
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|
194 state = STATE_IN_QUOTE_ESCAPE; |
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Initial revision
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|
195 break; |
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parents:
diff
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|
196 case '\0': |
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diff
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|
197 /* unclosed quote */ |
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198 retval = TOK_ERR_UNTERMINATED_QUOTE; |
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Initial revision
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parents:
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|
199 goto out; |
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parents:
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|
200 default: |
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Initial revision
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parents:
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|
201 /* regular character */ |
27
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|
202 strbuf_appendc(&buf, &buf_size, *p); |
0
a7e41e1a79c8
Initial revision
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parents:
diff
changeset
|
203 } |
a7e41e1a79c8
Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
204 break; |
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Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
205 case STATE_IN_WORD_ESCAPE: /* FALLTHROUGH */ |
a7e41e1a79c8
Initial revision
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parents:
diff
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|
206 case STATE_IN_QUOTE_ESCAPE: |
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Initial revision
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parents:
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|
207 if (*p == '\0') { |
a7e41e1a79c8
Initial revision
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parents:
diff
changeset
|
208 /* trailing backslash */ |
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Initial revision
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parents:
diff
changeset
|
209 retval = TOK_ERR_TRAILING_BACKSLASH; |
a7e41e1a79c8
Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
210 goto out; |
a7e41e1a79c8
Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
211 } |
a7e41e1a79c8
Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
212 /* escaped character */ |
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parents:
diff
changeset
|
213 state = (state == STATE_IN_WORD_ESCAPE) ? |
a7e41e1a79c8
Initial revision
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diff
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|
214 STATE_IN_WORD : STATE_IN_QUOTE; |
27
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diff
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|
215 strbuf_appendc(&buf, &buf_size, *p); |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
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0
diff
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|
216 break; |
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parents:
0
diff
changeset
|
217 case STATE_IN_MACRO: |
722a45b4028b
Add define command for defining macros
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0
diff
changeset
|
218 switch (*p) { |
722a45b4028b
Add define command for defining macros
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diff
changeset
|
219 case ' ': /* FALLTHROUGH */ |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
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0
diff
changeset
|
220 case '\t': /* FALLTHROUGH */ |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
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0
diff
changeset
|
221 case '\n': /* FALLTHROUGH */ |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
222 case '\0': |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
223 /* end of token */ |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
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diff
changeset
|
224 name = xstrdup(buf); |
722a45b4028b
Add define command for defining macros
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0
diff
changeset
|
225 tokenv[tokenc] = xmalloc(sizeof (union tok)); |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
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diff
changeset
|
226 tokenv[tokenc]->macro.type = TOK_MACRO; |
722a45b4028b
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|
227 tokenv[tokenc]->macro.name = name; |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
228 tokenc++; |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
229 |
722a45b4028b
Add define command for defining macros
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0
diff
changeset
|
230 if (*p == '\0') { |
722a45b4028b
Add define command for defining macros
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diff
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|
231 retval = TOK_ERR_OK; |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
232 goto out; |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
233 } |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
234 state = STATE_INITIAL; |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
235 break; |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
236 default: |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
237 /* |
722a45b4028b
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diff
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|
238 * macro names must only contain alphanumeric |
722a45b4028b
Add define command for defining macros
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diff
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|
239 * characters and underscores |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
240 */ |
722a45b4028b
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
241 if (!isascii(*p) || (!isalnum(*p) && |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
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0
diff
changeset
|
242 (*p != '_'))) { |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
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diff
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|
243 retval = TOK_ERR_INVALID_MACRO_NAME; |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
244 goto out; |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
245 } |
722a45b4028b
Add define command for defining macros
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
0
diff
changeset
|
246 strbuf_appendc(&buf, &buf_size, *p); |
0
a7e41e1a79c8
Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
247 } |
a7e41e1a79c8
Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
248 break; |
a7e41e1a79c8
Initial revision
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff
changeset
|
249 } |
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250 p++; |
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251 } |
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252 |
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253 out: |
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254 if (retval < 0) { |
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255 tok_free(tokenv); |
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256 } else { |
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257 tokenv[tokenc] = NULL; |
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258 *tokencp = tokenc; |
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259 *tokenvp = xrealloc(tokenv, (tokenc + 1) * |
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260 sizeof (union tok *)); |
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261 } |
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262 free(buf); |
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263 |
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264 return (retval); |
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265 } |