lib/path: add ul_path_get_abspath()

Signed-off-by: Karel Zak <kzak@redhat.com>

include/path.h

@@ -39,6 +39,9 @@ void *ul_path_get_dialect(struct path_cxt *pc);
 int ul_path_set_enoent_redirect(struct path_cxt *pc, int (*func)(struct path_cxt *, const char *, int *));
 int ul_path_get_dirfd(struct path_cxt *pc);
 
+char *ul_path_get_abspath(struct path_cxt *pc, char *buf, size_t bufsz, const char *path, ...)
+				__attribute__ ((__format__ (__printf__, 4, 5)));
+
 int ul_path_access(struct path_cxt *pc, int mode, const char *path);
 int ul_path_accessf(struct path_cxt *pc, int mode, const char *path, ...)
 				__attribute__ ((__format__ (__printf__, 3, 4)));

lib/path.c

@@ -176,7 +176,6 @@ static const char *get_absdir(struct path_cxt *pc)
 	return pc->path_buffer;
 }
 
-
 int ul_path_get_dirfd(struct path_cxt *pc)
 {
 	assert(pc);
@@ -209,6 +208,39 @@ static const char *ul_path_mkpath(struct path_cxt *pc, const char *path, va_list
 	return pc->path_buffer;
 }
 
+char *ul_path_get_abspath(struct path_cxt *pc, char *buf, size_t bufsz, const char *path, ...)
+{
+	if (path) {
+		int rc;
+		va_list ap;
+		const char *tail = NULL;
+
+		va_start(ap, path);
+		tail = ul_path_mkpath(pc, path, ap);
+		va_end(ap);
+
+		rc = snprintf(buf, bufsz, "%s/%s/%s",
+				pc->prefix ? pc->prefix : "",
+				pc->dir_path,
+				tail);
+
+		if ((size_t)rc >= bufsz) {
+			errno = ENAMETOOLONG;
+			return NULL;
+		}
+	} else {
+		const char *tmp = get_absdir(pc);
+
+		if (!tmp)
+			return NULL;
+		strncpy(buf, tmp, bufsz);
+		buf[bufsz - 1] = '\0';
+	}
+
+	return buf;
+}
+
+
 int ul_path_access(struct path_cxt *pc, int mode, const char *path)
 {
 	int dir, rc;