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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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329
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61 static struct input_stack *is = NULL;
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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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66
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67 lw_stringlist_reset(as -> input_files);
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68 while (is)
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69 {
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70 t = is;
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71 is = is -> next;
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72 lw_free(t);
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73 }
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74 }
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328
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75
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329
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76 void input_pushpath(asmstate_t *as, char *fn)
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328
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77 {
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329
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78 /* take apart fn into path and filename then push the path */
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79 /* onto the current file path stack */
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80 char *dn, *dp;
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81 int o;
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82
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83 dn = lw_strdup(fn);
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84 dp = dn + strlen(dp);
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85
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86 while (--dp != dn)
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87 {
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88 if (*dp == '/')
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89 break;
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90 }
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91 if (*dp == '/')
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92 *dp = '\0';
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328
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93
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329
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94 if (dp == dn)
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95 {
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96 lw_free(dn);
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97 dn = lw_strdup(".");
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98 lw_stack_push(as -> file_dir, dn);
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99 return;
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100 }
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101 dp = lw_strdup(dn);
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102 lw_free(dn);
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103 lw_stack_push(as -> file_dir, dp);
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104 }
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105
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106 void input_openstring(asmstate_t *as, char *s, char *str)
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107 {
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108 struct input_stack *t;
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109
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110 t = lw_alloc(sizeof(struct input_stack));
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111 t -> filespec = lw_strdup(s);
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112
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113 t -> type = input_type_string;
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114 t -> data = lw_strdup(str);
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115 t -> data2 = 0;
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116 t -> next = is;
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117 is = t;
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118 t -> filespec = lw_strdup(s);
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328
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119 }
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120
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329
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121 void input_open(asmstate_t *as, char *s)
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328
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122 {
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329
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123 struct input_stack *t;
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124 char *s2;
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125 char *p, *p2;
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126
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127 t = lw_alloc(sizeof(struct input_stack));
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128 t -> filespec = lw_strdup(s);
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129
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130 for (s2 = s; *s2 && *s2 != ':'; s2++)
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131 /* do nothing */ ;
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132 if (!s2)
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133 {
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134 t -> type = input_type_file;
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135 }
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136 else
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328
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137 {
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329
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138 char *ts;
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139
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140 ts = lw_strndup(s, s2 - s);
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141 s = s2 + 1;
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328
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142
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329
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143 if (!strcmp(ts, "include"))
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144 t -> type = input_type_include;
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145 else if (!strcmp(ts, "file"))
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146 t -> type = input_type_file;
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147 else
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148 t -> type = input_type_error;
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149 }
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150
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151 t -> next = is;
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152 is = t;
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153
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154 switch (is -> type)
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155 {
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156 case input_type_include:
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157 /* first check for absolute path and if so, skip path */
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158 if (*s == '/')
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328
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159 {
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329
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160 /* absolute path */
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161 is -> data = fopen(s, "rb");
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162 if (!is -> data)
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163 {
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164 lw_error("Cannot open file '%s': %s", s, strerror(errno));
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165 }
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166 input_pushpath(as, s);
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167 break;
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328
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168 }
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169
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329
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170 /* relative path, check relative to "current file" directory */
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171 p = lw_stack_top(as -> file_dir);
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172 0 == asprintf(&p2, "%s/%s", p, s);
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173 is -> data = fopen(p2, "rb");
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174 if (is -> data)
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175 {
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176 input_pushpath(as, p2);
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177 lw_free(p2);
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178 break;
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179 }
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180 lw_free(p2);
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181
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182 /* now check relative to entries in the search path */
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183 lw_stringlist_reset(as -> include_list);
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184 while (p = lw_stringlist_current(as -> include_list))
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185 {
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186 0 == asprintf(&p2, "%s/%s", p, s);
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187 is -> data = fopen(p2, "rb");
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188 if (is -> data)
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189 {
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190 input_pushpath(as, p2);
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191 lw_free(p2);
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192 return;
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193 }
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194 lw_free(p2);
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195 lw_stringlist_next(as -> include_list);
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196 }
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197 lw_error("Cannot open include file '%s': %s", s, strerror(errno));
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198
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199 case input_type_file:
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200 is -> data = fopen(s, "rb");
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201
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202 if (!is -> data)
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203 {
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204 lw_error("Cannot open file '%s': %s", s, strerror(errno));
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205 }
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206 input_pushpath(as, s);
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207 return;
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208 }
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209
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210 lw_error("Cannot figure out how to open '%s'.", s);
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211 }
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212
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213 char *input_readline(asmstate_t *as)
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214 {
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215 char *s;
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216 char linebuff[2049];
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217 int lbloc;
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218 int eol = 0;
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219
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220 /* if no file is open, open one */
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221 nextfile:
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222 if (!is) {
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223 s = lw_stringlist_current(as -> input_files);
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224 if (!s)
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225 return NULL;
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226 lw_stringlist_next(as -> input_files);
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227 input_open(as, s);
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328
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228 }
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229
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329
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230 switch (is -> type)
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231 {
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232 case input_type_file:
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233 case input_type_include:
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234 /* read from a file */
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235 for (;;)
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236 {
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237 int c, c2;
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238 c = fgetc(is -> data);
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239 lbloc = 0;
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240 if (c == EOF)
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241 {
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242 if (lbloc == 0)
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243 {
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244 struct input_stack *t;
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245 fclose(is -> data);
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246 lw_free(lw_stack_pop(as -> file_dir));
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247 lw_free(is -> filespec);
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248 t = is -> next;
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249 lw_free(is);
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250 is = t;
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251 goto nextfile;
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252 }
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253 linebuff[lbloc] = '\0';
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254 eol = 1;
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255 }
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256 else if (c == '\r')
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257 {
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258 linebuff[lbloc] = '\0';
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259 eol = 1;
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260 c2 = fgetc(is -> data);
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261 if (c2 == EOF)
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262 c = EOF;
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263 else if (c2 != '\n')
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264 ungetc(c2, is -> data);
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265 }
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266 else if (c == '\n')
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267 {
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268 linebuff[lbloc] = '\0';
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269 eol = 1;
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270 c2 = fgetc(is -> data);
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271 if (c2 == EOF)
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272 c = EOF;
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273 else if (c2 != '\r')
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274 ungetc(c2, is -> data);
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275 }
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276 else
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277 {
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278 if (lbloc < 2048)
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279 linebuff[lbloc++] = c;
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280 }
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281 if (eol)
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282 {
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283 s = lw_strdup(linebuff);
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284 return s;
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285 }
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286 }
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287
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288 case input_type_string:
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289 /* read from a string */
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290 if (((char *)(is -> data))[is -> data2] == '\0')
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291 {
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292 struct input_stack *t;
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293 lw_free(is -> data);
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294 lw_free(is -> filespec);
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295 t = is -> next;
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296 lw_free(is);
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297 is = t;
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298 goto nextfile;
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299 }
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300 s = (char *)(is -> data);
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301 lbloc = 0;
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302 for (;;)
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303 {
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304 int c;
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305 c = s[is -> data2];
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306 if (c)
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307 is -> data2++;
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308 if (c == '\0')
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309 {
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310 linebuff[lbloc] = '\0';
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311 eol = 1;
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312 }
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313 else if (c == '\r')
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314 {
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315 linebuff[lbloc] = '\0';
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316 eol = 1;
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317 if (s[is -> data2] == '\n')
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318 is -> data2++;
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319 }
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320 else if (c == '\n')
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321 {
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322 linebuff[lbloc] = '\0';
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323 eol = 1;
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324 if (s[is -> data2] == '\r')
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325 is -> data2++;
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326 }
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327 else
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328 {
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329 if (lbloc < 2048)
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330 linebuff[lbloc++] = c;
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331 }
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332 if (eol)
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333 {
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334 s = lw_strdup(linebuff);
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335 return s;
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336 }
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337 }
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328
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338
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329
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339 default:
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340 lw_error("Problem reading from unknown input type");
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341 }
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328
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342 }
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