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annotate config.c @ 467:140af5509ce7

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Added copyright notice to source files and added GPL license text in COPYING
author Mike Pavone <pavone@retrodev.com>
date Tue, 10 Sep 2013 23:31:08 -0700
parents 440efd7d27a9
children 39cad98d2789
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.
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5 */
430
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6 #include "tern.h"
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <stdarg.h>
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11 #include <ctype.h>
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12
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13 #include <sys/types.h>
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14 #include <sys/stat.h>
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15 #include <unistd.h>
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16
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17 char * alloc_concat(char * first, char * second)
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18 {
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19 int flen = strlen(first);
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20 int slen = strlen(second);
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21 char * ret = malloc(flen + slen + 1);
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22 memcpy(ret, first, flen);
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23 memcpy(ret+flen, second, slen+1);
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24 return ret;
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25 }
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26
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27 char * alloc_concat_m(int num_parts, char ** parts)
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28 {
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29 int total = 0;
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30 for (int i = 0; i < num_parts; i++) {
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31 total += strlen(parts[i]);
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32 }
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33 char * ret = malloc(total + 1);
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34 *ret = 0;
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35 for (int i = 0; i < num_parts; i++) {
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36 strcat(ret, parts[i]);
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37 }
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38 return ret;
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39 }
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40
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41 long file_size(FILE * f)
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42 {
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43 fseek(f, 0, SEEK_END);
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44 long fsize = ftell(f);
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45 fseek(f, 0, SEEK_SET);
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46 return fsize;
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47 }
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48
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49 char * strip_ws(char * text)
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50 {
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51 while (*text && (!isprint(*text) || isblank(*text)))
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52 {
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53 text++;
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54 }
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55 char * ret = text;
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56 text = ret + strlen(ret) - 1;
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57 while (text > ret && (!isprint(*text) || isblank(*text)))
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58 {
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59 *text = 0;
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60 text--;
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61 }
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62 return ret;
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63 }
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64
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65 char * split_keyval(char * text)
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66 {
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67 while (*text && !isblank(*text))
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68 {
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69 text++;
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70 }
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71 if (!*text) {
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72 return text;
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73 }
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74 *text = 0;
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75 return text+1;
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76 }
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77
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78 #define MAX_NEST 30 //way more than I'll ever need
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79
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80 tern_node * parse_config(char * config_data)
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81 {
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82 char *state, *curline;
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83 char *prefix = NULL;
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84 int nest_level = 0;
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85 char * prefix_parts[MAX_NEST];
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86 int line = 1;
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87 tern_node * head = NULL;
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88 while ((curline = strtok_r(config_data, "\n", &state)))
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89 {
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90 config_data = NULL;
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91 curline = strip_ws(curline);
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92 int len = strlen(curline);
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93 if (!len) {
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94 continue;
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95 }
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96 if (curline[0] == '#') {
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97 continue;
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98 }
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99 if (curline[0] == '}') {
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100 if (!nest_level) {
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101 fprintf(stderr, "unexpected } on line %d\n", line);
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102 exit(1);
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103 }
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104 if (prefix) {
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105 free(prefix);
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106 prefix = NULL;
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107 }
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108 nest_level--;
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109 curline = strip_ws(curline+1);
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110 }
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111 char * end = curline + len - 1;
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112 if (*end == '{') {
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113 *end = 0;
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114 curline = strip_ws(curline);
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115 prefix_parts[nest_level++] = curline;
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116 if (prefix) {
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117 free(prefix);
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118 prefix = NULL;
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119 }
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120 } else {
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121 if (nest_level && !prefix) {
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122 prefix = alloc_concat_m(nest_level, prefix_parts);
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123 }
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124 char * val = strip_ws(split_keyval(curline));
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125 char * key = curline;
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126 if (*key) {
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127 if (prefix) {
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128 key = alloc_concat(prefix, key);
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129 }
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440efd7d27a9 Read key bindings from config file
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130 head = tern_insert_ptr(head, key, strdup(val));
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131 if (prefix) {
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132 free(key);
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133 }
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134 }
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135 }
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136 }
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137 if (prefix) {
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138 free(prefix);
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139 }
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140 return head;
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141 }
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142
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143 tern_node * parse_config_file(char * config_path)
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144 {
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145 tern_node * ret = NULL;
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146 FILE * config_file = fopen(config_path, "r");
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147 if (!config_file) {
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148 goto open_fail;
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149 }
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150 long config_size = file_size(config_file);
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151 if (!config_size) {
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152 goto config_empty;
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153 }
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154 char * config_data = malloc(config_size);
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155 if (fread(config_data, 1, config_size, config_file) != config_size) {
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156 goto config_read_fail;
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157 }
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158 ret = parse_config(config_data);
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159 config_read_fail:
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160 free(config_data);
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161 config_empty:
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162 fclose(config_file);
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163 open_fail:
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164 return ret;
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165 }
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166
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167 char * readlink_alloc(char * path)
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168 {
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169 char * linktext = NULL;
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170 ssize_t linksize = 512;
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diff changeset
171 ssize_t cursize = 0;
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172 do {
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diff changeset
173 if (linksize > cursize) {
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diff changeset
174 cursize = linksize;
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diff changeset
175 if (linktext) {
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diff changeset
176 free(linktext);
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177 }
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178 }
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Mike Pavone <pavone@retrodev.com>
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diff changeset
179 linktext = malloc(cursize);
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180 linksize = readlink(path, linktext, cursize-1);
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parents:
diff changeset
181 if (linksize == -1) {
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parents:
diff changeset
182 perror("readlink");
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diff changeset
183 free(linktext);
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184 linktext = NULL;
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185 }
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
186 } while (linksize > cursize);
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187 return linktext;
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188 }
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diff changeset
189
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
190 tern_node * load_config(char * expath)
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parents:
diff changeset
191 {
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parents:
diff changeset
192 char * linktext;
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
193 char * home = getenv("HOME");
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parents:
diff changeset
194 if (!home) {
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parents:
diff changeset
195 goto load_in_app_dir;
7f84090ab1cd Add config file parser and default config file
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parents:
diff changeset
196 }
7f84090ab1cd Add config file parser and default config file
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parents:
diff changeset
197 char * path = alloc_concat(home, "/.config/blastem/blastem.cfg");
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parents:
diff changeset
198 tern_node * ret = parse_config_file(path);
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parents:
diff changeset
199 if (ret) {
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
200 goto success;
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
201 }
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
202 free(path);
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
203 load_in_app_dir:
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parents:
diff changeset
204
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
205 linktext = readlink_alloc("/proc/self/exe");
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
206 if (!linktext) {
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
207 goto link_prob;
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
208 }
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
209 char * cur;
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
210 int linksize = strlen(linktext);
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
211 for(cur = linktext + linksize - 1; cur != linktext; cur--)
7f84090ab1cd Add config file parser and default config file
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parents:
diff changeset
212 {
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
213 if (*cur == '/') {
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
214 *cur = 0;
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
215 break;
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
216 }
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
217 }
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
218 if (cur == linktext) {
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
219 goto link_prob;
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
220 }
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
221 path = alloc_concat(linktext, "/default.cfg");
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
222 ret = parse_config_file(path);
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
223 success:
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
224 return ret;
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
225 link_prob:
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
226 if (linktext) {
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
227 free(linktext);
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
228 }
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
229 no_proc:
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
230 //TODO: Fall back to using expath if /proc is not available
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
231 fputs("Failed to find a config file in ~/.config/blastem/blastem.cfg or in the blastem executable directory\n", stderr);
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
232 exit(1);
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
233 }
7f84090ab1cd Add config file parser and default config file
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
234