progmem.h

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#pragma once
 
// Platform-agnostic macros for PROGMEM string handling
// On ESP8266/Arduino: Use Arduino's F() macro for PROGMEM strings
// On other platforms: Use plain strings (no PROGMEM)
 
#ifdef USE_ESP8266
// ESP8266 uses Arduino macros
#define ESPHOME_F(string_literal) F(string_literal)
#define ESPHOME_PGM_P PGM_P
#define ESPHOME_strncpy_P strncpy_P
#define ESPHOME_strncat_P strncat_P
#else
#define ESPHOME_F(string_literal) (string_literal)
#define ESPHOME_PGM_P const char *
#define ESPHOME_strncpy_P strncpy
#define ESPHOME_strncat_P strncat
#endif