Mercurial > repos > blastem
annotate config.c @ 495:39cad98d2789
Allow OpenGL support to be disabled at compile time. Move generic utility functions out of config.c
author | Mike Pavone <pavone@retrodev.com> |
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date | Mon, 28 Oct 2013 19:37:30 -0700 |
parents | 140af5509ce7 |
children | 6fc71114d145 |
rev | line source |
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1 /* |
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2 Copyright 2013 Michael Pavone |
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3 This file is part of BlastEm. |
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. |
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5 */ |
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6 #include "tern.h" |
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7 #include "util.h" |
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8 #include <stdio.h> |
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9 #include <stdlib.h> |
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10 #include <string.h> |
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11 |
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12 #include <sys/types.h> |
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13 #include <sys/stat.h> |
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14 #include <unistd.h> |
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15 |
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16 #define MAX_NEST 30 //way more than I'll ever need |
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17 |
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18 tern_node * parse_config(char * config_data) |
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19 { |
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20 char *state, *curline; |
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21 char *prefix = NULL; |
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22 int nest_level = 0; |
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23 char * prefix_parts[MAX_NEST]; |
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24 int line = 1; |
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25 tern_node * head = NULL; |
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26 while ((curline = strtok_r(config_data, "\n", &state))) |
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27 { |
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28 config_data = NULL; |
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29 curline = strip_ws(curline); |
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30 int len = strlen(curline); |
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31 if (!len) { |
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32 continue; |
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33 } |
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34 if (curline[0] == '#') { |
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35 continue; |
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36 } |
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37 if (curline[0] == '}') { |
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38 if (!nest_level) { |
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39 fprintf(stderr, "unexpected } on line %d\n", line); |
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40 exit(1); |
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41 } |
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42 if (prefix) { |
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43 free(prefix); |
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44 prefix = NULL; |
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45 } |
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46 nest_level--; |
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47 curline = strip_ws(curline+1); |
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48 } |
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49 char * end = curline + len - 1; |
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50 if (*end == '{') { |
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51 *end = 0; |
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52 curline = strip_ws(curline); |
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53 prefix_parts[nest_level++] = curline; |
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54 if (prefix) { |
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55 free(prefix); |
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56 prefix = NULL; |
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57 } |
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58 } else { |
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59 if (nest_level && !prefix) { |
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60 prefix = alloc_concat_m(nest_level, prefix_parts); |
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61 } |
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62 char * val = strip_ws(split_keyval(curline)); |
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63 char * key = curline; |
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64 if (*key) { |
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65 if (prefix) { |
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66 key = alloc_concat(prefix, key); |
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67 } |
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68 head = tern_insert_ptr(head, key, strdup(val)); |
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69 if (prefix) { |
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70 free(key); |
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71 } |
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72 } |
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73 } |
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74 } |
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75 if (prefix) { |
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76 free(prefix); |
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77 } |
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78 return head; |
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79 } |
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80 |
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81 tern_node * parse_config_file(char * config_path) |
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82 { |
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83 tern_node * ret = NULL; |
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84 FILE * config_file = fopen(config_path, "r"); |
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85 if (!config_file) { |
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86 goto open_fail; |
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87 } |
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88 long config_size = file_size(config_file); |
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89 if (!config_size) { |
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90 goto config_empty; |
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91 } |
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92 char * config_data = malloc(config_size); |
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93 if (fread(config_data, 1, config_size, config_file) != config_size) { |
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94 goto config_read_fail; |
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95 } |
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96 ret = parse_config(config_data); |
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97 config_read_fail: |
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98 free(config_data); |
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99 config_empty: |
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100 fclose(config_file); |
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101 open_fail: |
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102 return ret; |
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103 } |
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104 |
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105 char * readlink_alloc(char * path) |
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106 { |
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107 char * linktext = NULL; |
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108 ssize_t linksize = 512; |
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109 ssize_t cursize = 0; |
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110 do { |
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111 if (linksize > cursize) { |
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112 cursize = linksize; |
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113 if (linktext) { |
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114 free(linktext); |
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115 } |
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116 } |
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117 linktext = malloc(cursize); |
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118 linksize = readlink(path, linktext, cursize-1); |
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119 if (linksize == -1) { |
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120 perror("readlink"); |
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121 free(linktext); |
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122 linktext = NULL; |
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123 } |
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124 } while (linksize > cursize); |
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125 return linktext; |
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126 } |
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127 |
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128 tern_node * load_config(char * expath) |
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129 { |
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130 char * linktext; |
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131 char * home = getenv("HOME"); |
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132 if (!home) { |
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133 goto load_in_app_dir; |
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134 } |
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135 char * path = alloc_concat(home, "/.config/blastem/blastem.cfg"); |
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136 tern_node * ret = parse_config_file(path); |
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137 if (ret) { |
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138 goto success; |
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139 } |
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140 free(path); |
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141 load_in_app_dir: |
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142 |
430
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143 linktext = readlink_alloc("/proc/self/exe"); |
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144 if (!linktext) { |
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145 goto link_prob; |
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146 } |
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147 char * cur; |
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148 int linksize = strlen(linktext); |
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149 for(cur = linktext + linksize - 1; cur != linktext; cur--) |
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150 { |
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151 if (*cur == '/') { |
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152 *cur = 0; |
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153 break; |
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154 } |
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155 } |
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156 if (cur == linktext) { |
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157 goto link_prob; |
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158 } |
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159 path = alloc_concat(linktext, "/default.cfg"); |
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160 ret = parse_config_file(path); |
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161 success: |
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162 return ret; |
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163 link_prob: |
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164 if (linktext) { |
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165 free(linktext); |
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166 } |
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167 no_proc: |
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168 //TODO: Fall back to using expath if /proc is not available |
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169 fputs("Failed to find a config file in ~/.config/blastem/blastem.cfg or in the blastem executable directory\n", stderr); |
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170 exit(1); |
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171 } |
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172 |