AP_Progmem: identity to use regular strings as PSTRs

libraries/AP_Progmem/AP_Progmem.h

@@ -6,6 +6,8 @@
 #include "AP_Progmem_AVR.h"
 #elif defined(DESKTOP_BUILD)
 #include "AP_Progmem_DesktopBuild.h"
+#else
+#include "AP_Progmem_Identity.h"
 #endif
 
 #define PROGMEM_STRING(_v, _s)  static const char _v[] PROGMEM = _s

libraries/AP_Progmem/AP_Progmem_Identity.h

@@ -0,0 +1,49 @@
+
+#ifndef __AP_PROGMEM_IDENTITY__
+#define __AP_PROGMEM_IDENTITY__
+
+#include <string.h>
+
+#define SITL_debug(fmt, args ...)
+
+typedef struct {
+    char c;
+} prog_char_t;
+
+#define PSTR(s) s;
+
+static inline int strcasecmp_P(const char *str1, const prog_char_t *pstr)
+{
+    return strcasecmp(str1, pstr);
+}
+
+static inline int strcmp_P(const char *str1, const prog_char_t *pstr)
+{
+    return strcmp(str1, pstr);
+}
+
+static inline size_t strlen_P(const prog_char_t *pstr)
+{
+    return strlen(pstr);
+}
+
+static inline void *memcpy_P(void *dest, const prog_char_t *src, size_t n)
+{
+    return memcpy(dest, src, n);
+}
+
+
+static inline char *strncpy_P(char *buffer, const prog_char_t *pstr, size_t buffer_size)
+{
+    return strncpy(buffer, pstr, buffer_size);
+}
+
+
+// read something the size of a pointer. This makes the menu code more
+// portable
+static inline uintptr_t pgm_read_pointer(const void *s) {
+    return &((uintptr_t*)s)
+}
+
+#endif // __AP_PROGMEM_IDENTITY__
+