Completed _scanf.c, added vsscanf.c, rewrote sscanf.c.

Added an assembler include _file.inc and changed asm code that uses struct
FILE to be independent of its size.
Fixed return codes in several files to use EOF instead of -1.


git-svn-id: svn://svn.cc65.org/cc65/trunk@1205 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/common/fputc.c

@@ -16,14 +16,14 @@ int fputc (int c, FILE* f)
 {
     /* Check if the file is open or if there is an error condition */
     if ((f->f_flags & _FOPEN) == 0 || (f->f_flags & (_FERROR | _FEOF)) != 0) {
-    	return -1;
+    	return EOF;
     }
 
     /* Write the byte (knows about byte order!) */
     if (write (f->f_fd, &c, 1) <= 0) {
    	/* Error */
 	f->f_flags |= _FERROR;
-	return -1;
+	return EOF;
     }
 
     /* Return the byte written */