Add 'teensytp/' from commit 'be48e888050f18a31e788269c8f47358036a8e3b'

[megadrive.git] / teensytp / teensy3 / nonstd.c

diff --git a/teensytp/teensy3/nonstd.c b/teensytp/teensy3/nonstd.c
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+++ b/teensytp/teensy3/nonstd.c
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+/* Teensyduino Core Library
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2013 PJRC.COM, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * 1. The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * 2. If the Software is incorporated into a build system that allows 
+ * selection among a list of target devices, then similar target
+ * devices manufactured by PJRC.COM must be included in the list of
+ * target devices and selectable in the same manner.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "avr_functions.h"
+#include <string.h>
+#include <stdio.h>
+
+size_t strlen(const char *s)
+{
+       size_t n=0;
+
+       while (*s++) n++;
+       return n;
+}
+
+
+char * ultoa(unsigned long val, char *buf, int radix)  
+{
+       unsigned digit;
+       int i=0, j;
+       char t;
+
+       while (1) {
+               digit = val % radix;
+               buf[i] = ((digit < 10) ? '0' + digit : 'A' + digit - 10);
+               val /= radix;
+               if (val == 0) break;
+               i++;
+       }
+       buf[i + 1] = 0;
+       for (j=0; j < i; j++, i--) {
+               t = buf[j];
+               buf[j] = buf[i];
+               buf[i] = t;
+       }
+       return buf;
+}
+
+char * ltoa(long val, char *buf, int radix)
+{
+       if (val >= 0) {
+               return ultoa(val, buf, radix);
+       } else {
+               buf[0] = '-';
+               ultoa(-val, buf + 1, radix);
+               return buf;
+       }
+}
+
+// TODO: actually write an efficient dtostrf()....
+char * dtostrf(float val, int width, unsigned int precision, char *buf)
+{
+       char format[20];
+       sprintf(format, "%%%d.%df", width, precision);
+       sprintf(buf, format, val);
+       return buf;
+}
+