1 files changed, 59 insertions, 0 deletions

diff --git a/firmware/include/ap_int.h b/firmware/include/ap_int.h
new file mode 100644
index 0000000000..68cbb2fb71
--- /dev/null
+++ b/firmware/include/ap_int.h
@@ -0,0 +1,59 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2018 by Michael A. Sevakis
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef AP_INT_H
+#define AP_INT_H
+
+/* Miscellaneous large-sized integer functions */
+
+#include <stdbool.h>
+#include <stdint.h>
+
+/* return floor(log(2)*base2exp) - assists in estimating buffer sizes
+ * when converting to decimal */
+static inline int base10exp(int base2exp)
+{
+    /* 1292913986 = floor(2^32*log(2)) */
+    static const long log10of2 = 1292913986L;
+    return log10of2 * (int64_t)base2exp >> 32;
+}
+
+struct ap_int
+{
+    long     numchunks; /* number of uint32_t chunks or zero */
+    long     basechunk; /* chunk of start of value bits */
+    uint32_t *chunks;    /* pointer to chunk array (caller alloced) */
+    long     len;        /* length of output */
+    long     shift;      /* number of fractional bits */
+    uint64_t val;        /* value, if it fits and numchunks is zero */
+};
+
+bool round_number_string10(char *p_rdig, long len);
+
+/* format arbitrary-precision base 10 integer */
+char * format_ap_int10(struct ap_int *a,
+                       char *p_end);
+
+/* format arbitrary-precision base 10 fraction */
+char * format_ap_frac10(struct ap_int *a,
+                        char *p_start,
+                        long precision);
+
+#endif /* AP_INT_H */