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328
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1 /*
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2 input.c
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <config.h>
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23
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24 /*
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25 This file is used to handle reading input files. It serves to encapsulate
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26 the entire input system to make porting to different media and systems
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27 less difficult.
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28 */
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29
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329
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30 #include <errno.h>
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31 #include <stdio.h>
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32 #include <string.h>
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33
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328
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34 #include <lw_alloc.h>
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35 #include <lw_stringlist.h>
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329
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36 #include <lw_string.h>
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37 #include "lwasm.h"
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328
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38
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329
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39 /*
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40 Data type for storing input buffers
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41 */
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42
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43 enum input_types_e
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328
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44 {
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329
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45 input_type_file, // regular file, no search path
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46 input_type_include, // include path, start from "local"
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47 input_type_string, // input from a string
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48
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49 input_type_error // invalid input type
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50 };
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51
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52 struct input_stack
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53 {
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54 struct input_stack *next;
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55 int type;
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56 void *data;
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57 int data2;
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58 char *filespec;
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328
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59 };
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60
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330
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61 #define IS ((struct input_stack *)(as -> input_data))
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328
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62
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329
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63 void input_init(asmstate_t *as)
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64 {
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65 struct input_stack *t;
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330
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66
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67 if (as -> file_dir)
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68 lw_stack_destroy(as -> file_dir);
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69 as -> file_dir = lw_stack_create(lw_free);
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329
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70 lw_stringlist_reset(as -> input_files);
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330
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71 while (IS)
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329
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72 {
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330
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73 t = IS;
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74 as -> input_data = IS -> next;
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329
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75 lw_free(t);
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76 }
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77 }
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328
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78
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329
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79 void input_pushpath(asmstate_t *as, char *fn)
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328
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80 {
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329
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81 /* take apart fn into path and filename then push the path */
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82 /* onto the current file path stack */
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83 char *dn, *dp;
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84 int o;
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85
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86 dn = lw_strdup(fn);
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332
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87 dp = dn + strlen(dn);
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329
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88
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89 while (--dp != dn)
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90 {
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91 if (*dp == '/')
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92 break;
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93 }
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94 if (*dp == '/')
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95 *dp = '\0';
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328
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96
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329
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97 if (dp == dn)
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98 {
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99 lw_free(dn);
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100 dn = lw_strdup(".");
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101 lw_stack_push(as -> file_dir, dn);
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102 return;
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103 }
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104 dp = lw_strdup(dn);
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105 lw_free(dn);
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106 lw_stack_push(as -> file_dir, dp);
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107 }
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108
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109 void input_openstring(asmstate_t *as, char *s, char *str)
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110 {
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111 struct input_stack *t;
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112
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113 t = lw_alloc(sizeof(struct input_stack));
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114 t -> filespec = lw_strdup(s);
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115
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116 t -> type = input_type_string;
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117 t -> data = lw_strdup(str);
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118 t -> data2 = 0;
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330
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119 t -> next = IS;
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120 as -> input_data = t;
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329
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121 t -> filespec = lw_strdup(s);
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328
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122 }
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123
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329
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124 void input_open(asmstate_t *as, char *s)
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328
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125 {
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329
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126 struct input_stack *t;
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127 char *s2;
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128 char *p, *p2;
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129
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130 t = lw_alloc(sizeof(struct input_stack));
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131 t -> filespec = lw_strdup(s);
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132
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332
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133 for (s2 = s; *s2 && (*s2 != ':'); s2++)
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329
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134 /* do nothing */ ;
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332
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135 if (!*s2)
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329
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136 {
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137 t -> type = input_type_file;
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138 }
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139 else
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328
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140 {
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329
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141 char *ts;
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142
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143 ts = lw_strndup(s, s2 - s);
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144 s = s2 + 1;
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145 if (!strcmp(ts, "include"))
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146 t -> type = input_type_include;
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147 else if (!strcmp(ts, "file"))
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148 t -> type = input_type_file;
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149 else
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150 t -> type = input_type_error;
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332
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151
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152 lw_free(ts);
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329
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153 }
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332
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154 t -> next = as -> input_data;
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330
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155 as -> input_data = t;
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329
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156
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330
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157 switch (IS -> type)
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329
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158 {
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159 case input_type_include:
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160 /* first check for absolute path and if so, skip path */
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161 if (*s == '/')
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328
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162 {
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329
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163 /* absolute path */
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330
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164 IS -> data = fopen(s, "rb");
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165 if (!IS -> data)
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329
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166 {
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167 lw_error("Cannot open file '%s': %s", s, strerror(errno));
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168 }
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169 input_pushpath(as, s);
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170 break;
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328
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171 }
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172
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329
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173 /* relative path, check relative to "current file" directory */
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174 p = lw_stack_top(as -> file_dir);
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175 0 == asprintf(&p2, "%s/%s", p, s);
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330
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176 IS -> data = fopen(p2, "rb");
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177 if (IS -> data)
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329
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178 {
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179 input_pushpath(as, p2);
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180 lw_free(p2);
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181 break;
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182 }
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183 lw_free(p2);
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184
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185 /* now check relative to entries in the search path */
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186 lw_stringlist_reset(as -> include_list);
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187 while (p = lw_stringlist_current(as -> include_list))
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188 {
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189 0 == asprintf(&p2, "%s/%s", p, s);
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330
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190 IS -> data = fopen(p2, "rb");
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191 if (IS -> data)
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329
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192 {
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193 input_pushpath(as, p2);
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194 lw_free(p2);
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195 return;
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196 }
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197 lw_free(p2);
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198 lw_stringlist_next(as -> include_list);
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199 }
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200 lw_error("Cannot open include file '%s': %s", s, strerror(errno));
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332
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201
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329
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202 case input_type_file:
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330
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203 IS -> data = fopen(s, "rb");
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329
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204
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330
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205 if (!IS -> data)
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329
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206 {
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207 lw_error("Cannot open file '%s': %s", s, strerror(errno));
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208 }
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209 input_pushpath(as, s);
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210 return;
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211 }
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212
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332
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213 lw_error("Cannot figure out how to open '%s'.", t -> filespec);
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329
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214 }
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215
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216 char *input_readline(asmstate_t *as)
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217 {
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218 char *s;
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219 char linebuff[2049];
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220 int lbloc;
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221 int eol = 0;
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222
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223 /* if no file is open, open one */
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224 nextfile:
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330
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225 if (!IS) {
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329
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226 s = lw_stringlist_current(as -> input_files);
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227 if (!s)
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228 return NULL;
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229 lw_stringlist_next(as -> input_files);
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230 input_open(as, s);
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328
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231 }
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232
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330
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233 switch (IS -> type)
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329
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234 {
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235 case input_type_file:
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236 case input_type_include:
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237 /* read from a file */
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332
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238 lbloc = 0;
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329
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239 for (;;)
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240 {
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241 int c, c2;
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330
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242 c = fgetc(IS -> data);
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329
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243 if (c == EOF)
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244 {
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245 if (lbloc == 0)
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246 {
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247 struct input_stack *t;
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330
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248 fclose(IS -> data);
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329
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249 lw_free(lw_stack_pop(as -> file_dir));
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330
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250 lw_free(IS -> filespec);
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251 t = IS -> next;
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252 lw_free(IS);
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253 as -> input_data = t;
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329
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254 goto nextfile;
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255 }
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256 linebuff[lbloc] = '\0';
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257 eol = 1;
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258 }
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259 else if (c == '\r')
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260 {
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261 linebuff[lbloc] = '\0';
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262 eol = 1;
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330
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263 c2 = fgetc(IS -> data);
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329
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264 if (c2 == EOF)
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265 c = EOF;
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266 else if (c2 != '\n')
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330
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267 ungetc(c2, IS -> data);
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329
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268 }
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269 else if (c == '\n')
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270 {
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271 linebuff[lbloc] = '\0';
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272 eol = 1;
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330
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273 c2 = fgetc(IS -> data);
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329
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274 if (c2 == EOF)
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275 c = EOF;
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276 else if (c2 != '\r')
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330
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277 ungetc(c2, IS -> data);
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329
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278 }
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279 else
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280 {
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281 if (lbloc < 2048)
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282 linebuff[lbloc++] = c;
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283 }
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284 if (eol)
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285 {
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286 s = lw_strdup(linebuff);
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287 return s;
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288 }
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289 }
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290
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291 case input_type_string:
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292 /* read from a string */
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330
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293 if (((char *)(IS -> data))[IS -> data2] == '\0')
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329
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294 {
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295 struct input_stack *t;
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330
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296 lw_free(IS -> data);
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297 lw_free(IS -> filespec);
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298 t = IS -> next;
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299 lw_free(IS);
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300 as -> input_data = t;
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329
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301 goto nextfile;
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302 }
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330
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303 s = (char *)(IS -> data);
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329
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304 lbloc = 0;
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305 for (;;)
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306 {
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307 int c;
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330
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308 c = s[IS -> data2];
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329
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309 if (c)
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330
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310 IS -> data2++;
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329
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311 if (c == '\0')
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312 {
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313 linebuff[lbloc] = '\0';
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314 eol = 1;
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315 }
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316 else if (c == '\r')
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317 {
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318 linebuff[lbloc] = '\0';
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319 eol = 1;
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330
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320 if (s[IS -> data2] == '\n')
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321 IS -> data2++;
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329
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322 }
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323 else if (c == '\n')
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324 {
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325 linebuff[lbloc] = '\0';
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326 eol = 1;
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330
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327 if (s[IS -> data2] == '\r')
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328 IS -> data2++;
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329
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329 }
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330 else
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331 {
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332 if (lbloc < 2048)
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333 linebuff[lbloc++] = c;
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334 }
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335 if (eol)
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336 {
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337 s = lw_strdup(linebuff);
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338 return s;
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339 }
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340 }
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328
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341
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329
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342 default:
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343 lw_error("Problem reading from unknown input type");
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344 }
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328
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345 }
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330
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346
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347 char *input_curspec(asmstate_t *as)
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348 {
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349 if (IS)
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350 return IS -> filespec;
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351 return NULL;
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352 }
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