add fancy hardfault handler, increase heater stack size

Lib/snprintf/snprintf.c

@@ -29,6 +29,10 @@
 #define my_malloc(len) pvPortMalloc((len))
 #define my_free(p)     vPortFree((p))
 
+// Use a static buffer to avoid allocating for every printf!
+#define S_PRINTF_BUF_LEN 200
+static char s_printf_buf[S_PRINTF_BUF_LEN];
+
 // Toggle features
 #define size_t size_t /* normally: int, unsigned */
 #undef  HAVE_LONG_DOUBLE
@@ -733,9 +737,11 @@ static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
         // leading zeros in the fractional part
         fzeropad = 0;
         fzerocnt = max - 1;
-        while (fracpart < POW10(fzerocnt)) {
-            fzeropad++;
-            fzerocnt--;
+        if (fzerocnt > 0) {
+            while (fracpart < POW10(fzerocnt)) {
+                fzeropad++;
+                fzerocnt--;
+            }
         }
         do {
             temp = fracpart;
@@ -800,8 +806,9 @@ static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
             zpadlen = 0;
         }
 
-        while (fzeropad-- > 0) {
+        while (fzeropad > 0) {
             dopr_outch(buffer, currlen, maxlen, '0');
+            fzeropad--;
         }
 
         while (fplace > 0) {
@@ -892,6 +899,18 @@ int printf(const char *format, ...)
     va_list ap;
     int ret;
 
+    va_start(ap, format);
+    ret = vsnprintf(s_printf_buf, S_PRINTF_BUF_LEN, format, ap);
+    va_end(ap);
+
+    PUTS(s_printf_buf);
+
+    return ret;
+
+#if 0
+    va_list ap;
+    int ret;
+
     char *ptr = NULL;
 
     va_start(ap, format);
@@ -906,6 +925,7 @@ int printf(const char *format, ...)
     my_free(ptr);
 
     return ret;
+#endif
 }
 
 int vprintf(const char *format, va_list ap)