_PORTING UNIX APPLICATIONS TO DOS_
by David N. Glass


Figure 1: Macros to handle text and binary files in DOS.

#ifdef DOS
#	define READ_BIN	"rb"
#	define READ_TXT	"r"
#	define WRITE_BIN "wb"
#	define WRITE_TXT "w"
#else	/* the unix way */
#	define READ_BIN	"r"
#	define READ_TXT	"r"
#	define WRITE_BIN "w"
#	define WRITE_TXT	
#endif 	/* DOS */



Figure 2:  Mapping the UNIX SIGALRM to a DOS user-defined signal.

#ifdef DOS
# define SIGALRM SIGUSR1
#endif 	/*DOS*/




Figure 3. Writing files using a specified file handle.

write_files(fp, buffer, bytes)
int fp;
char *buffer;
int bytes;
{
  if (bytes > 0) write(fp, buffer, bytes);
}



Figure 4: Mapping WRIT_TTY to either DOS or UNIX I/O calls.

#ifdef DOS
# define WRITE_TTY write_port
#else  /* unix */
# define WRITE_TTY write
#endif	/* DOS */