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annotate lwasm/strings.c @ 574:a0c9433dc0d4 default tip

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Updated submission guidelines including notes about evangelism. TLDR: Don't.
author William Astle <lost@l-w.ca>
date Mon, 04 Mar 2024 10:10:38 -0700
parents 724bcc4508bc
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 strings.c
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3 Copyright © 2021 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 Contains stuff associated with generalized string parsing including
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21 interpolation.
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22
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23 A general string is enclosed in double quotes. Within the string, the
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24 following is supported:
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25
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26 %(VAR): a string variable defined with SETSTR
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27 %[SYM]: the value of SYM; must be constant on pass 1 or will resolve to ""
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28 \": a literal "
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29 \%: a literal %
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30 \n: a newline
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31 \r: a carriage return
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32 \t: a tab
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33 \f: a form feed
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34 \e: ESC (0x1b)
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35 \\: a backslash
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36 \xXX: an 8 bit value where XX are hex digits
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37
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38 */
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39
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40 #include <ctype.h>
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41 #include <string.h>
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42
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43 #include <lw_alloc.h>
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44 #include <lw_dict.h>
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45 #include <lw_string.h>
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46 #include <lw_strbuf.h>
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47
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48 #include "lwasm.h"
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49 #include "instab.h"
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50
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51 void lwasm_stringvar_unset(asmstate_t *as, char *strname)
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52 {
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53 if (!(as -> stringvars))
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54 return;
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55 lw_dict_unset(as -> stringvars, strname);
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56 }
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57
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58 void lwasm_stringvar_set(asmstate_t *as, char *strname, char *strval)
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59 {
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60 if (!(as -> stringvars))
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61 as -> stringvars = lw_dict_create();
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62 lw_dict_set(as -> stringvars, strname, strval);
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63 }
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64
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65 char *lwasm_stringvar_get(asmstate_t *as, char *strname)
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66 {
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67 if (!(as -> stringvars))
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68 return "";
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69 return lw_dict_get(as -> stringvars, strname);
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70 }
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71
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72 PARSEFUNC(pseudo_parse_setstr)
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73 {
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74 char *t1;
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75 char *strname;
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76 char *strval;
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77
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78 l -> len = 0;
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79 if (!**p)
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80 {
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81 lwasm_register_error(as, l, E_OPERAND_BAD);
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82 return;
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83 }
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84
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85 for (t1 = *p; *t1 && *t1 != '='; t1++)
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86 /* do nothing */;
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87 strname = lw_alloc(t1 - *p + 1);
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88 strncpy(strname, *p, t1 - *p);
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89 strname[t1 - *p] = '\0';
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90 *p = t1;
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91 if (**p == '\0')
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92 {
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93 lwasm_stringvar_unset(l -> as, strname);
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94 lw_free(strname);
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95 return;
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96 }
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97 (*p)++;
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98 strval = lwasm_parse_general_string(l, p);
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99 if (!strval)
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100 {
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101 lwasm_stringvar_unset(l -> as, strname);
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102 lw_free(strname);
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103 return;
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104 }
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105 lwasm_stringvar_set(l -> as, strname, strval);
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106 lw_free(strval);
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107 }
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108
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109 char *lwasm_parse_general_string(line_t *l, char **p)
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110 {
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111 struct lw_strbuf *sb;
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112
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113 if (!**p || isspace(**p))
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114 return lw_strdup("");
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115 if (**p != '"')
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116 {
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117 lwasm_register_error(l -> as, l, E_OPERAND_BAD);
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118 return NULL;
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119 }
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120
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121 (*p)++;
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122 sb = lw_strbuf_new();
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123 while (**p && **p != '"')
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124 {
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125 switch (**p)
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126 {
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127 case '\\':
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128 if ((*p)[1])
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129 {
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130 (*p)++;
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131 switch (**p)
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132 {
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133 case 'n':
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134 lw_strbuf_add(sb, 10);
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135 break;
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136
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137 case 'r':
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138 lw_strbuf_add(sb, 13);
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139 break;
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140
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141 case 't':
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142 lw_strbuf_add(sb, 9);
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143 break;
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144
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145 case 'f':
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146 lw_strbuf_add(sb, 12);
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147 break;
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148
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149 case 'e':
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150 lw_strbuf_add(sb, 27);
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151 break;
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152
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153 case 'x':
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
154 if ((*p)[1] && (*p)[2])
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
155 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
156 int d1 = (*p)[1];
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
157 int d2 = (*p)[2];
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
158 if (d1 < '0' || (d1 > '9' && d1 < 'A') || (d1 > 'F' && d1 < 'a') || d1 > 'f' ||
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
159 d2 < '0' || (d2 > '9' && d2 < 'A') || (d2 > 'F' && d2 < 'a') || d2 > 'f')
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
160 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
161 lw_strbuf_add(sb, 'x');
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
162 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
163 else
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
164 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
165 (*p) += 2;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
166 d1 -= '0';
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
167 d2 -= '0';
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
168 if (d1 > 9)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
169 d1 -= 7;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
170 if (d1 > 15)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
171 d1 -= 32;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
172 if (d2 > 9)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
173 d2 -= 7;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
174 if (d2 > 15)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
175 d2 -= 32;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
176 lw_strbuf_add(sb, (d1 << 4) | d2);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
177 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
178 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
179 else
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
180 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
181 lw_strbuf_add(sb, 'x');
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
182 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
183 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
184
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
185 default:
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
186 lw_strbuf_add(sb, **p);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
187 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
188 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
189 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
190 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
191
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
192 case '%':
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
193 (*p)++;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
194 if (**p == '(')
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
195 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
196 char *t1;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
197 // string var
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
198 for (t1 = *p + 1; *t1 && *t1 != ')' && *t1 != '"'; t1++)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
199 /* do nothing */ ;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
200 if (*t1 != ')')
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
201 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
202 lw_strbuf_add(sb, '%');
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
203 (*p)--;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
204 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
205 else
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
206 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
207 char *strname;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
208 strname = lw_alloc(t1 - *p);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
209 strncpy(strname, *p + 1, t1 - *p);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
210 strname[t1 - *p - 1] = '\0';
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
211 *p = t1;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
212 t1 = lwasm_stringvar_get(l -> as, strname);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
213 lw_free(strname);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
214 for (strname = t1; *strname; strname++)
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
215 lw_strbuf_add(sb, *strname);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
216 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
217 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
218 else
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
219 {
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
220 // unknown % sequence; back up and output the %
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
221 (*p)--;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
222 lw_strbuf_add(sb, '%');
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
223 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
224 break;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
225
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
226 default:
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
227 lw_strbuf_add(sb, **p);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
228 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
229 (*p)++;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
230 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
231 if (**p == '"')
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
232 (*p)++;
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
233 return lw_strbuf_end(sb);
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
234 }
724bcc4508bc Add SETSTR/INCLUDESTR for some basic code building
William Astle <lost@l-w.ca>
parents:
diff changeset
235