Estimate Remaining Time (graphical display) (#15497)

Marlin/src/libs/numtostr.h

@@ -24,69 +24,74 @@
 #include <stdint.h>
 
 // Convert a full-range unsigned 8bit int to a percentage
-char* ui8tostr4pct(const uint8_t i);
+const char* ui8tostr4pct(const uint8_t i);
 
 // Convert uint8_t to string with 123 format
-char* ui8tostr3(const uint8_t i);
+const char* ui8tostr3(const uint8_t i);
 
 // Convert int8_t to string with 123 format
-char* i8tostr3(const int8_t x);
+const char* i8tostr3(const int8_t x);
+
+#if HAS_PRINT_PROGRESS_PERMYRIAD
+  // Convert 16-bit unsigned permyriad value to percent: 100 / 23 / 23.4 / 3.45
+  const char* permyriadtostr4(const uint16_t xx);
+#endif
 
 // Convert uint16_t to string with 12345 format
-char* ui16tostr5(const uint16_t x);
+const char* ui16tostr5(const uint16_t x);
 
 // Convert uint16_t to string with 1234 format
-char* ui16tostr4(const uint16_t x);
+const char* ui16tostr4(const uint16_t x);
 
 // Convert uint16_t to string with 123 format
-char* ui16tostr3(const uint16_t x);
+const char* ui16tostr3(const uint16_t x);
 
 // Convert int16_t to string with 123 format
-char* i16tostr3(const int16_t x);
+const char* i16tostr3(const int16_t x);
 
 // Convert unsigned int to lj string with 123 format
-char* i16tostr3left(const int16_t xx);
+const char* i16tostr3left(const int16_t xx);
 
 // Convert signed int to rj string with _123, -123, _-12, or __-1 format
-char* i16tostr4sign(const int16_t x);
+const char* i16tostr4sign(const int16_t x);
 
 // Convert unsigned float to string with 1.23 format
-char* ftostr12ns(const float &x);
+const char* ftostr12ns(const float &x);
 
 // Convert signed float to fixed-length string with 12.34 / -2.34 or 023.45 / -23.45 format
-char* ftostr42_52(const float &x);
+const char* ftostr42_52(const float &x);
 
 // Convert signed float to fixed-length string with 023.45 / -23.45 format
-char* ftostr52(const float &x);
+const char* ftostr52(const float &x);
 
 // Convert float to fixed-length string with +123.4 / -123.4 format
-char* ftostr41sign(const float &x);
+const char* ftostr41sign(const float &x);
 
 // Convert signed float to string (6 digit) with -1.234 / _0.000 / +1.234 format
-char* ftostr43sign(const float &x, char plus=' ');
+const char* ftostr43sign(const float &x, char plus=' ');
 
 // Convert signed float to string (5 digit) with -1.2345 / _0.0000 / +1.2345 format
-char* ftostr54sign(const float &x, char plus=' ');
+const char* ftostr54sign(const float &x, char plus=' ');
 
 // Convert unsigned float to rj string with 12345 format
-char* ftostr5rj(const float &x);
+const char* ftostr5rj(const float &x);
 
 // Convert signed float to string with +1234.5 format
-char* ftostr51sign(const float &x);
+const char* ftostr51sign(const float &x);
 
 // Convert signed float to space-padded string with -_23.4_ format
-char* ftostr52sp(const float &x);
+const char* ftostr52sp(const float &x);
 
 // Convert signed float to string with +123.45 format
-char* ftostr52sign(const float &x);
+const char* ftostr52sign(const float &x);
 
 // Convert unsigned float to string with 1234.5 format omitting trailing zeros
-char* ftostr51rj(const float &x);
+const char* ftostr51rj(const float &x);
 
 #include "../core/macros.h"
 
 // Convert float to rj string with 123 or -12 format
-FORCE_INLINE char* ftostr3(const float &x) { return i16tostr3(int16_t(x + (x < 0 ? -0.5f : 0.5f))); }
+FORCE_INLINE const char* ftostr3(const float &x) { return i16tostr3(int16_t(x + (x < 0 ? -0.5f : 0.5f))); }
 
 #include "../inc/MarlinConfigPre.h"
 
@@ -95,5 +100,5 @@ FORCE_INLINE char* ftostr3(const float &x) { return i16tostr3(int16_t(x + (x < 0
   char* ftostr4sign(const float &fx);
 #else
   // Convert float to rj string with 1234, _123, -123, __12, _-12, ___1, or __-1 format
-  FORCE_INLINE char* ftostr4sign(const float &x) { return i16tostr4sign(int16_t(x + (x < 0 ? -0.5f : 0.5f))); }
+  FORCE_INLINE const char* ftostr4sign(const float &x) { return i16tostr4sign(int16_t(x + (x < 0 ? -0.5f : 0.5f))); }
 #endif