ESP reboot on using PSTR() within sprintf function call

This results into a reboot:

char str[80];
sprintf(str,PSTR("This is a demo: %s for sprintf from flash"),"test123");
Serial.println(str);

Or should I be using sprint_P() but that seems unavailable on ESP.
How to use progmem strings as param to sprintf() ?

[Links2004]

you mean sprintf_P()?

Arduino/hardware/arduino/sam/cores/arduino/avr/pgmspace.h

Line 54 in ea302aa

#define sprintf_P(s, f, ...) sprintf((s), (f), __VA_ARGS__)

[hallard]

@Links2004
Yeah, sprintf_P() would be great but I'm unable to use it (not found at compilation), did I missed one include file ?

[Makuna]

You can't use PSTR() with functions that don't end in _P, it won't work correctly.

Links2004 link is incorrect, it should be
https://github.com/esp8266/Arduino/blob/ea302aab05480ad36c076b618abb642b1eb1893b/hardware/esp8266com/esp8266/cores/esp8266/pgmspace.h

Are you including "avr/pgmspace.h"? If so that doesn't work. You need to include just "pgmspace.h".

Further, it looks like sprintf_P is not listed, but snprintf_P is. I will add this, but if you want a work around, you can use snprintf_P instead.