1 files changed, 72 insertions, 0 deletions
diff --git a/src/lib/home-expand.c b/src/lib/home-expand.c
new file mode 100644
index 0000000..282ede9
--- /dev/null
+++ b/src/lib/home-expand.c
@@ -0,0 +1,72 @@
+/* Copyright (c) 2003-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ipwd.h"
+#include "home-expand.h"
+
+
+int home_try_expand(const char **_path)
+{
+	const char *path = *_path;
+	const char *name, *home, *p;
+	struct passwd pw;
+
+	if (path == NULL || *path != '~')
+		return 0;
+
+	path++;
+	if (*path == '/' || *path == '\0') {
+		home = getenv("HOME");
+		if (*path != '\0') path++;
+	} else {
+		p = strchr(path, '/');
+		if (p == NULL) {
+			name = path;
+			path = "";
+		} else {
+			name = t_strdup_until(path, p);
+			path = p+1;
+		}
+		switch (i_getpwnam(name, &pw)) {
+		case -1:
+			i_error("getpwnam(%s) failed: %m", name);
+			home = NULL;
+			break;
+		case 0:
+			home = NULL;
+			break;
+		default:
+			home = pw.pw_dir;
+			break;
+		}
+	}
+
+	if (home == NULL)
+		return -1;
+
+	if (*path == '\0')
+		*_path = t_strdup(home);
+	else
+		*_path = t_strconcat(home, "/", path, NULL);
+	return 0;
+}
+
+const char *home_expand(const char *path)
+{
+	(void)home_try_expand(&path);
+	return path;
+}
+
+const char *home_expand_tilde(const char *path, const char *home)
+{
+	if (path == NULL || *path != '~')
+		return path;
+
+	if (path[1] == '\0')
+		return home;
+	if (path[1] != '/')
+		return path;
+
+	/* ~/ used */
+	return t_strconcat(home, path + 1, NULL);
+}