Compensate between arduino stdlib.h and host stdlib.h

Author: hlovdal

cpp/arduino/stdlib.cpp

@@ -0,0 +1,61 @@
+
+#if 0 // This code is copied from https://people.cs.umu.se/isak/snippets/ltoa.c
+/*
+**  LTOA.C
+**
+**  Converts a long integer to a string.
+**
+**  Copyright 1988-90 by Robert B. Stout dba MicroFirm
+**
+**  Released to public domain, 1991
+**
+**  Parameters: 1 - number to be converted
+**              2 - buffer in which to build the converted string
+**              3 - number base to use for conversion
+**
+**  Returns:  A character pointer to the converted string if
+**            successful, a NULL pointer if the number base specified
+**            is out of range.
+*/
+
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFSIZE (sizeof(long) * 8 + 1)
+
+char *ltoa(long N, char *str, int base)
+{
+      register int i = 2;
+      long uarg;
+      char *tail, *head = str, buf[BUFSIZE];
+
+      if (36 < base || 2 > base)
+            base = 10;                    /* can only use 0-9, A-Z        */
+      tail = &buf[BUFSIZE - 1];           /* last character position      */
+      *tail-- = '\0';
+
+      if (10 == base && N < 0L)
+      {
+            *head++ = '-';
+            uarg    = -N;
+      }
+      else  uarg = N;
+
+      if (uarg)
+      {
+            for (i = 1; uarg; ++i)
+            {
+                  register ldiv_t r;
+
+                  r       = ldiv(uarg, base);
+                  *tail-- = (char)(r.rem + ((9L < r.rem) ?
+                                  ('A' - 10L) : '0'));
+                  uarg    = r.quot;
+            }
+      }
+      else  *tail-- = '0';
+
+      memcpy(head, ++tail, i);
+      return str;
+}
+#endif

cpp/arduino/stdlib.h

@@ -0,0 +1,14 @@
+#pragma once
+
+// Header file to compensate for differences between
+// arduino-1.x.x/hardware/tools/avr/avr/include/stdlib.h and /usr/include/stdlib.h.
+
+#include_next <stdlib.h>
+
+/*
+ * Arduino stdlib.h includes a prototype for itoa which is not a standard function,
+ * and is not available in /usr/include/stdlib.h. Provide one here.
+ * http://www.cplusplus.com/reference/cstdlib/itoa/
+ * https://stackoverflow.com/questions/190229/where-is-the-itoa-function-in-linux
+ */
+char *itoa(int val, char *s, int radix);