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comparison 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
comparison
equal deleted inserted replaced
495:39cad98d2789 496:6fc71114d145
6 #include "tern.h" 6 #include "tern.h"
7 #include "util.h" 7 #include "util.h"
8 #include <stdio.h> 8 #include <stdio.h>
9 #include <stdlib.h> 9 #include <stdlib.h>
10 #include <string.h> 10 #include <string.h>
11
12 #include <sys/types.h>
13 #include <sys/stat.h>
14 #include <unistd.h>
15 11
16 #define MAX_NEST 30 //way more than I'll ever need 12 #define MAX_NEST 30 //way more than I'll ever need
17 13
18 tern_node * parse_config(char * config_data) 14 tern_node * parse_config(char * config_data)
19 { 15 {
100 fclose(config_file); 96 fclose(config_file);
101 open_fail: 97 open_fail:
102 return ret; 98 return ret;
103 } 99 }
104 100
105 char * readlink_alloc(char * path) 101 tern_node * load_config()
106 { 102 {
107 char * linktext = NULL; 103 char * exe_dir;
108 ssize_t linksize = 512;
109 ssize_t cursize = 0;
110 do {
111 if (linksize > cursize) {
112 cursize = linksize;
113 if (linktext) {
114 free(linktext);
115 }
116 }
117 linktext = malloc(cursize);
118 linksize = readlink(path, linktext, cursize-1);
119 if (linksize == -1) {
120 perror("readlink");
121 free(linktext);
122 linktext = NULL;
123 }
124 } while (linksize > cursize);
125 return linktext;
126 }
127
128 tern_node * load_config(char * expath)
129 {
130 char * linktext;
131 char * home = getenv("HOME"); 104 char * home = getenv("HOME");
132 if (!home) { 105 if (!home) {
133 goto load_in_app_dir; 106 goto load_in_app_dir;
134 } 107 }
135 char * path = alloc_concat(home, "/.config/blastem/blastem.cfg"); 108 char * path = alloc_concat(home, "/.config/blastem/blastem.cfg");
137 if (ret) { 110 if (ret) {
138 goto success; 111 goto success;
139 } 112 }
140 free(path); 113 free(path);
141 load_in_app_dir: 114 load_in_app_dir:
142 115 exe_dir = get_exe_dir();
143 linktext = readlink_alloc("/proc/self/exe"); 116 if (!exe_dir) {
144 if (!linktext) { 117 goto no_config;
145 goto link_prob;
146 } 118 }
147 char * cur; 119 path = alloc_concat(exe_dir, "/default.cfg");
148 int linksize = strlen(linktext); 120 ret = parse_config_file(path);
149 for(cur = linktext + linksize - 1; cur != linktext; cur--) 121 free(path);
150 { 122 success:
151 if (*cur == '/') { 123 if (ret) {
152 *cur = 0; 124 return ret;
153 break;
154 }
155 } 125 }
156 if (cur == linktext) { 126 no_config:
157 goto link_prob;
158 }
159 path = alloc_concat(linktext, "/default.cfg");
160 ret = parse_config_file(path);
161 success:
162 return ret;
163 link_prob:
164 if (linktext) {
165 free(linktext);
166 }
167 no_proc:
168 //TODO: Fall back to using expath if /proc is not available
169 fputs("Failed to find a config file in ~/.config/blastem/blastem.cfg or in the blastem executable directory\n", stderr); 127 fputs("Failed to find a config file in ~/.config/blastem/blastem.cfg or in the blastem executable directory\n", stderr);
170 exit(1); 128 exit(1);
171 } 129 }
172 130