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linux-user: Fix "print_fdset()" in "strace.c" to not print ", " after last value 

Function "print_fdset()" in "strace.c" is used to print the file descriptor
values in "print__newselect()" which prints arguments of syscall _newselect().
Until changes from this patch, this function was printing "," even after the
last value of the fd_set argument. This was changed in this patch by removing
this unnecessary "," after the last fd value and thus improving the estetics of
the _newselect() "-strace" print.

Implementation notes:

   The printing fix was made possible by using an existing function "get_comma()"
   which returns a "," or an empty string "" based on its argument (0 for "," and
   other for "").

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200702160915.9517-1-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Filip Bozuta 2020-07-02 18:09:15 +02:00 committed by Laurent Vivier
parent d7df0ceee0
commit 664441ea01
1 changed files with 6 additions and 2 deletions
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8
linux-user/strace.c
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@ -541,6 +541,7 @@ static void
print_fdset(int n, abi_ulong target_fds_addr)
{
int i;
int first = 1;
qemu_log("[");
if( target_fds_addr ) {
@ -555,9 +556,12 @@ print_fdset(int n, abi_ulong target_fds_addr)
return;
for (i=n; i>=0; i--) {
if ((tswapal(target_fds[i / TARGET_ABI_BITS]) >> (i & (TARGET_ABI_BITS - 1))) & 1)
qemu_log("%d,", i);
if ((tswapal(target_fds[i / TARGET_ABI_BITS]) >>
(i & (TARGET_ABI_BITS - 1))) & 1) {
qemu_log("%s%d", get_comma(first), i);
first = 0;
}
}
unlock_user(target_fds, target_fds_addr, 0);
}
qemu_log("]");