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annotate config.c @ 495:39cad98d2789

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Allow OpenGL support to be disabled at compile time. Move generic utility functions out of config.c
author Mike Pavone <pavone@retrodev.com>
date Mon, 28 Oct 2013 19:37:30 -0700
parents 140af5509ce7
children 6fc71114d145
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
467
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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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.
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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5 */
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6 #include "tern.h"
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39cad98d2789 Allow OpenGL support to be disabled at compile time. Move generic utility functions out of config.c
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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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440efd7d27a9 Read key bindings from config file
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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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39cad98d2789 Allow OpenGL support to be disabled at compile time. Move generic utility functions out of config.c
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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