desktop: more progmem string functions

libraries/Desktop/include/avr/pgmspace.h

@@ -27,6 +27,7 @@ extern "C" {
 typedef char PROGMEM prog_char;
 extern int strcasecmp_P(const char *, PGM_P) __ATTR_PURE__;
 extern int strcmp_P(const char *, PGM_P) __ATTR_PURE__;
+extern int strncmp_P(const char *, PGM_P, size_t n) __ATTR_PURE__;
 extern size_t strlcat_P (char *, PGM_P, size_t );
 extern size_t strnlen_P (PGM_P, size_t );
 extern size_t strlen_P (PGM_P);

libraries/Desktop/support/Arduino.cpp

@@ -87,6 +87,16 @@ int strcmp_P(PGM_P str1, PGM_P str2)
 	return strcmp(str1, str2);
 }
 
+int strncmp_P(PGM_P str1, PGM_P str2, size_t n)
+{
+	return strncmp(str1, str2, n);
+}
+
+char *strncpy_P(char *dest, PGM_P src, size_t n)
+{
+	return strncpy(dest, src, n);
+}
+
 void *memcpy_P(void *dest, PGM_P src, size_t n)
 {
 	return memcpy(dest, src, n);