I'm trying to print out sizeof() values for some of my structures. They are coming out incorrect. Here is a small table in which I've done this on different platforms: Linux : sizeof(TChannel) = 1460 Windows: sizeof(TChannel) = 1460 8051 : sizeof(TChannel) = 1361 Are there byte-alignment issues perhaps? I have both Linux and Windows defaulting to a 1-byte boundary for byte alignment in structures. Does the 8051 default to something different? Here's my code for the 8051: Debugf( "sizeof(TChannel) = %u\r\n", sizeof( TChannel ) ); I've tried %u, %d, %lu, %bu, %X but can't get the right value. Here's my Debugf() function in case that might be messing things up: void Debugf(BYTE* format, ...) { #ifdef DEBUG xdata BYTE buf[64]; va_list arglist; va_start (arglist,format); vsprintf(buf,format,arglist); va_end (arglist); SendSerialData( buf, strlen( buf ) ); #endif } I don't think the problem is in my SendSerialData() function as that seems to work well. Any ideas?
After making sure my structs on Windows were byte aligned with: #ifdef _WINDOWS_ #pragma pack (1) #endif I also discovered that in Windows a BOOL is 4 bytes, which was defined as an unsigned char on 8051 (by me), which is only 1 byte. And a UINT on windows is 4 bytes, which is defined as unsigned int on 8051 (by me) and it's only 2 bytes. #ifndef _WINDOWS_ typedef unsigned char BYTE; typedef unsigned int UINT; typedef unsigned long ULONG; typedef unsigned char BOOL; typedef unsigned int WORD; typedef unsigned long DWORD; typedef unsigned int USHORT; #endif