New file

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General
+   Public License along with this library; if not, write to the
+   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301 USA */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <mailutils/errno.h>
+#include <mailutils/error.h>
+#include <mu_umaxtostr.h>
+
+static char **buffer_pool;
+static size_t buffer_size;
+#define BUFFER_SIZE_INIT 4
+#define BUFFER_SIZE_INCR 4
+
+static char *
+get_buffer (unsigned slot)
+{
+  if (!buffer_pool)
+    {
+      buffer_size = BUFFER_SIZE_INIT;
+      buffer_pool = calloc (buffer_size, sizeof *buffer_pool);
+    }
+  else if (slot >= buffer_size)
+    {
+      buffer_size += (slot + BUFFER_SIZE_INCR - 1) / BUFFER_SIZE_INCR;
+      buffer_pool = realloc (buffer_pool, buffer_size * sizeof *buffer_pool);
+    }
+  if (!buffer_pool)
+    return NULL;
+  if (buffer_pool[slot] == NULL)
+    buffer_pool[slot] = malloc (UINTMAX_STRSIZE_BOUND);
+  return buffer_pool[slot];
+}
+
+const char *
+mu_umaxtostr (unsigned slot, uintmax_t val)
+{
+  char *s = get_buffer (slot);
+  if (!s)
+    return mu_strerror(ENOMEM);
+  return umaxtostr (val, s);
+}

+#include <inttostr.h>
+
+#define UINTMAX_STRSIZE_BOUND INT_BUFSIZE_BOUND (uintmax_t)
+
+const char *mu_umaxtostr (unsigned slot, uintmax_t val);