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chardev: Use goto/label instead of do/break/while(0)

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Use of a do/while(0) control flow in order to permit an early break
is an unusual paradigm, and triggers a false positive with a planned
future syntax check against 'while (0);'.  Rewrite the code to use a
goto instead.  This patch temporarily keeps an extra level of
indentation to highlight the change; the next patch cleans it up.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20171201232433.25193-4-eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eric Blake 2017-12-01 17:24:29 -06:00 committed by Paolo Bonzini
parent 94f5c480e9
commit 19a4d43ef0
1 changed files with 10 additions and 3 deletions
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13
chardev/char-serial.c
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@ -64,9 +64,14 @@ static void tty_serial_init(int fd, int speed,
#endif #endif
tcgetattr(fd, &tty); tcgetattr(fd, &tty);
#define check_speed(val) if (speed <= val) { spd = B##val; break; } #define check_speed(val) \
if (speed <= val) { \
spd = B##val; \
goto done; \
}
speed = speed * 10 / 11; speed = speed * 10 / 11;
do { {
check_speed(50); check_speed(50);
check_speed(75); check_speed(75);
check_speed(110); check_speed(110);
@ -125,8 +130,10 @@ static void tty_serial_init(int fd, int speed,
check_speed(4000000); check_speed(4000000);
#endif #endif
spd = B115200; spd = B115200;
} while (0); }
#undef check_speed
done:
cfsetispeed(&tty, spd); cfsetispeed(&tty, spd);
cfsetospeed(&tty, spd); cfsetospeed(&tty, spd);