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annotate config.c @ 496:6fc71114d145

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Extract function to determine executable directory from load_config so it can be used elsewhere
author Mike Pavone <pavone@retrodev.com>
date Mon, 28 Oct 2013 21:48:46 -0700
parents 39cad98d2789
children 80a67be1770b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 #define MAX_NEST 30 //way more than I'll ever need
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13
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14 tern_node * parse_config(char * config_data)
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15 {
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16 char *state, *curline;
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17 char *prefix = NULL;
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18 int nest_level = 0;
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19 char * prefix_parts[MAX_NEST];
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20 int line = 1;
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21 tern_node * head = NULL;
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22 while ((curline = strtok_r(config_data, "\n", &state)))
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23 {
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24 config_data = NULL;
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25 curline = strip_ws(curline);
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26 int len = strlen(curline);
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27 if (!len) {
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28 continue;
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29 }
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30 if (curline[0] == '#') {
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31 continue;
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32 }
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33 if (curline[0] == '}') {
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34 if (!nest_level) {
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35 fprintf(stderr, "unexpected } on line %d\n", line);
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36 exit(1);
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37 }
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38 if (prefix) {
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39 free(prefix);
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40 prefix = NULL;
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41 }
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42 nest_level--;
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43 curline = strip_ws(curline+1);
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44 }
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45 char * end = curline + len - 1;
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46 if (*end == '{') {
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47 *end = 0;
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48 curline = strip_ws(curline);
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49 prefix_parts[nest_level++] = curline;
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50 if (prefix) {
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51 free(prefix);
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52 prefix = NULL;
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53 }
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54 } else {
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55 if (nest_level && !prefix) {
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56 prefix = alloc_concat_m(nest_level, prefix_parts);
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57 }
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58 char * val = strip_ws(split_keyval(curline));
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59 char * key = curline;
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60 if (*key) {
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61 if (prefix) {
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62 key = alloc_concat(prefix, key);
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63 }
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64 head = tern_insert_ptr(head, key, strdup(val));
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65 if (prefix) {
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66 free(key);
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67 }
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68 }
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69 }
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70 }
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71 if (prefix) {
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72 free(prefix);
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73 }
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74 return head;
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75 }
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76
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77 tern_node * parse_config_file(char * config_path)
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78 {
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79 tern_node * ret = NULL;
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80 FILE * config_file = fopen(config_path, "r");
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81 if (!config_file) {
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82 goto open_fail;
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83 }
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84 long config_size = file_size(config_file);
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85 if (!config_size) {
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86 goto config_empty;
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87 }
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88 char * config_data = malloc(config_size);
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89 if (fread(config_data, 1, config_size, config_file) != config_size) {
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90 goto config_read_fail;
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91 }
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92 ret = parse_config(config_data);
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93 config_read_fail:
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94 free(config_data);
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95 config_empty:
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96 fclose(config_file);
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97 open_fail:
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98 return ret;
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99 }
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100
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101 tern_node * load_config()
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102 {
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103 char * exe_dir;
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104 char * home = getenv("HOME");
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105 if (!home) {
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106 goto load_in_app_dir;
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107 }
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108 char * path = alloc_concat(home, "/.config/blastem/blastem.cfg");
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109 tern_node * ret = parse_config_file(path);
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110 if (ret) {
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111 goto success;
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112 }
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113 free(path);
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114 load_in_app_dir:
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115 exe_dir = get_exe_dir();
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116 if (!exe_dir) {
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117 goto no_config;
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118 }
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119 path = alloc_concat(exe_dir, "/default.cfg");
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120 ret = parse_config_file(path);
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121 free(path);
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122 success:
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123 if (ret) {
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124 return ret;
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125 }
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126 no_config:
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127 fputs("Failed to find a config file in ~/.config/blastem/blastem.cfg or in the blastem executable directory\n", stderr);
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128 exit(1);
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129 }
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130