Update util code and import Kerberos portability glue

Use the Kerberos portability layer from rra-c-util 3.0 and avoid
Kerberos API calls deprecated on Heimdal.  Break util/util.h into
separate header files and update all source files accordingly.

The test suite is not yet updated.  That will come in subsequent
commits.

1 files changed, 36 insertions, 0 deletions

diff --git a/util/concat.h b/util/concat.h
new file mode 100644
index 0000000..ef8b38d
--- /dev/null
+++ b/util/concat.h
@@ -0,0 +1,36 @@
+/*
+ * Prototypes for string concatenation with dynamic memory allocation.
+ *
+ * Written by Russ Allbery <rra@stanford.edu>
+ * This work is hereby placed in the public domain by its author.
+ */
+
+#ifndef UTIL_CONCAT_H
+#define UTIL_CONCAT_H 1
+
+#include <config.h>
+#include <portable/macros.h>
+
+BEGIN_DECLS
+
+/* Default to a hidden visibility for all util functions. */
+#pragma GCC visibility push(hidden)
+
+/* Concatenate NULL-terminated strings into a newly allocated string. */
+char *concat(const char *first, ...)
+    __attribute__((__malloc__, __nonnull__(1)));
+
+/*
+ * Given a base path and a file name, create a newly allocated path string.
+ * The name will be appended to base with a / between them.  Exceptionally, if
+ * name begins with a slash, it will be strdup'd and returned as-is.
+ */
+char *concatpath(const char *base, const char *name)
+    __attribute__((__malloc__, __nonnull__(2)));
+
+/* Undo default visibility change. */
+#pragma GCC visibility pop
+
+END_DECLS
+
+#endif /* UTIL_CONCAT_H */