1 files changed, 45 insertions, 0 deletions

diff --git a/src/env.c b/src/env.c
new file mode 100644
index 0000000..d13642f
--- /dev/null
+++ b/src/env.c
@@ -0,0 +1,45 @@
+#include "env.h"
+
+bool initialized_env = false;
+char *tabledir;
+
+void
+init_env()
+{
+        char *nissydata = getenv("NISSYDATA");
+        char *localdata = getenv("XDG_DATA_HOME");
+        char *home      = getenv("HOME");
+        bool read, write;
+
+        if (initialized_env)
+                return;
+
+        if (nissydata != NULL) {
+                tabledir = malloc(strlen(nissydata) * sizeof(char) + 20);
+                strcpy(tabledir, nissydata);
+        } else if (localdata != NULL) {
+                tabledir = malloc(strlen(localdata) * sizeof(char) + 20);
+                strcpy(tabledir, localdata);
+                strcat(tabledir, "/nissy");
+        } else if (home != NULL) {
+                tabledir = malloc(strlen(home) * sizeof(char) + 20);
+                strcpy(tabledir, home);
+                strcat(tabledir, "/.nissy");
+        }
+
+        mkdir(tabledir, 0777);
+        strcat(tabledir, "/tables");
+        mkdir(tabledir, 0777);
+
+        read  = !access(tabledir, R_OK);
+        write = !access(tabledir, W_OK);
+
+        if (!read) {
+                fprintf(stderr, "Table files cannot be read.\n");
+        } else if (!write) {
+                fprintf(stderr, "Data directory not writable: ");
+                fprintf(stderr, "tables can be loaded, but not saved.\n");
+        }
+
+        initialized_env = true;
+}