Diff: Blynk_v0_3_7/Blynk/utility/utility.cpp

Revision:

0:740c1eb2df13

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Blynk_v0_3_7/Blynk/utility/utility.cpp	Thu Jun 23 11:16:14 2016 +0000
@@ -0,0 +1,61 @@
+#include <Blynk/BlynkDebug.h>
+
+#if defined(ESP8266) && !defined(BLYNK_NO_FLOAT)
+#include <string.h>
+#include <math.h>
+
+char* dtostrf_internal(double number, signed char width, unsigned char prec, char *s) {
+    if(isnan(number)) {
+        strcpy(s, "nan");
+        return s;
+    }
+    if(isinf(number)) {
+        strcpy(s, "inf");
+        return s;
+    }
+
+    if(number > 4294967040.0 || number < -4294967040.0) {
+        strcpy(s, "ovf");
+        return s;
+    }
+    char* out = s;
+    // Handle negative numbers
+    if(number < 0.0) {
+        *out = '-';
+        ++out;
+        number = -number;
+    }
+
+    // Round correctly so that print(1.999, 2) prints as "2.00"
+    double rounding = 0.5;
+    for(uint8_t i = 0; i < prec; ++i)
+        rounding /= 10.0;
+
+    number += rounding;
+
+    // Extract the integer part of the number and print it
+    unsigned long int_part = (unsigned long) number;
+    double remainder = number - (double) int_part;
+    out += sprintf(out, "%d", int_part);
+
+    // Print the decimal point, but only if there are digits beyond
+    if(prec > 0) {
+        *out = '.';
+        ++out;
+    }
+
+    while(prec-- > 0) {
+        remainder *= 10.0;
+        if((int)remainder == 0){
+                *out = '0';
+                 ++out;
+        }
+    }
+    sprintf(out, "%d", (int) remainder);
+
+    return s;
+}
+
+#endif
+
+