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-/*
-From ptsfa!ames!sdcsvax!nosc!cod!owen Mon Dec 28 14:54:53 1987
-From: owen@cod.NOSC.MIL (Wallace E. Owen)
-Newsgroups: comp.lang.c
-Subject: msc bitfield bug
-Message-ID: <934@cod.NOSC.MIL>
-Date: 28 Dec 87 22:54:53 GMT
-Organization: Naval Ocean Systems Center, San Diego
-
-The following small bug in Microsoft 'C' (4.0) handling of forcing
-a bitfield to the next int or long was revealed while developing a Large
-piece of software. It's in the form of a small program which reveals the
-bug:
-
-/*
- This short program displays a bug in MS C buildout of bitfield expressions.
- Problem: Forcing bit field alignment to the next unsigned int or unsigned
- long works if the next statement is a bitfield expression, but if it's
- a unsigned long for instance, the padding ':0;' forces an extra item to
- be allocated BETWEEN the two expressions. Must be the method used
- to force bitfield to the next unsigned int or unsigned long. Should check
- that indeed the next statement IS a bitfield expression.
-*/
-
-struct testa /* 8 bytes */
-{
- unsigned long
- a: 5, b: 5, c: 5, d: 5, e: 5, : 0;
- unsigned long
- f: 8, g: 8, h: 8, i: 8;
-};
-
-struct testb /* Should be 8 bytes, but it's 12! */
-{
- unsigned long
- a: 5, b: 5, c: 5, d: 5, e: 5, : 0;
- unsigned long f;
-};
-
-main()
-{
- /* Print sizes of things */
- if (sizeof (struct testa) == sizeof (struct testb)) {
- printf("Test passed\n");
- } else {
- printf("Size of struct testa: %u\n", sizeof( struct testa));
- printf("Size of struct testb: %u\n", sizeof( struct testb));
- }
-}
-
-/*
-I'm going to try this with 5.0- Also, while at the c++ conference in
-Santa Fe, met the author of MSC 5.0's front end, and showed him this code.
- -- Wallace Owen
- (owen@cod.nosc.mil)
- (619) 553-3567
-*/