Create configuration directory if needed.

If gfsec-split is to create a configuration file in the "standard"
configuration directory ($XDG_CONFIG_HOME/gfsecret), make sure
that directory exists.

Closes #6

src/gfsec-split.c

@@ -225,11 +225,20 @@ transform_config_pathname(char **cfg, const char *secret)
 
     if ( base ) {
         const char *env_info;
+        char *config_dir = NULL;
 
-        if ( (env_info = getenv("XDG_CONFIG_HOME")) && *env_info )
-            xasprintf(cfg, "%s/gfsecret/%s.conf", env_info, base);
+        if ( (env_info = getenv("XDG_CONFIG_HOME")) && *env_info)
+            xasprintf(&config_dir, "%s/gfsecret", env_info);
         else if ( (env_info = getenv("HOME")) && *env_info )
-            xasprintf(cfg, "%s/.config/gfsecret/%s.conf", env_info, base);
+            xasprintf(&config_dir, "%s/.config/gfsecret", env_info);
+
+        if ( config_dir ) {
+            if ( makedir(config_dir, 0700) == -1 )
+                err(EXIT_FAILURE, "Cannot create configuration directory");
+
+            xasprintf(cfg, "%s/%s.conf", config_dir, base);
+            free(config_dir);
+        }
         else
             xasprintf(cfg, "%s.conf", base);
 

src/util.c

@@ -169,3 +169,44 @@ get_file_basename(const char *path)
 
     return xstrndup(path, n);
 }
+
+/**
+ * Creates a directory and its parents.
+ * This function creates the specified directory. Parent directories
+ * are created as needed.
+ *
+ * @param path The pathname of the directory to create.
+ * @param mode The permissions of the directory, as in creat(2).
+ *
+ * @return 0 if the directory was successfully created (or if it
+ * already existed), or -1 if an error occured.
+ */
+int
+makedir(const char *path, int mode)
+{
+    char *p, q;
+    int ret;
+    struct stat st_buf;
+
+    assert(path != NULL);
+
+    for ( p = (char *)(path + 1), ret = 0; *(p - 1) && ret == 0; p++ ) {
+        if ( *p == '/' || *p == '\0' ) {
+            q = *p, *p = '\0';
+
+            if ( stat(path, &st_buf) == -1 ) {
+                /* Path does not exist, attempt to create it. */
+                ret = mkdir(path, mode);
+            }
+            else if ( ! S_ISDIR(st_buf.st_mode) ) {
+                /* Path exists but is not a directory. */
+                errno = ENOTDIR;
+                ret = -1;
+            }
+
+            *p = q;
+        }
+    }
+
+    return ret;
+}

src/util.h

@@ -41,6 +41,9 @@ write_file(const char *, const unsigned char *, size_t);
 char *
 get_file_basename(const char *);
 
+int
+makedir(const char *, int);
+
 #ifdef __cplusplus
 }
 #endif