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Re: [Qemu-trivial] [PATCH] slirp: workaround gcc __warn_memset_zero_len
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-trivial] [PATCH] slirp: workaround gcc __warn_memset_zero_len warnings |
Date: |
Fri, 24 Feb 2012 08:29:54 +0000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Feb 23, 2012 at 10:29:42PM +0200, Alon Levy wrote:
> --- a/slirp/misc.c
> +++ b/slirp/misc.c
> @@ -358,7 +358,9 @@ void slirp_connection_info(Slirp *slirp, Monitor *mon)
> dst_port = so->so_fport;
> }
> n = snprintf(buf, sizeof(buf), " TCP[%s]", state);
> - memset(&buf[n], ' ', 19 - n);
> + if (n < 19) {
> + memset(&buf[n], ' ', 19 - n);
> + }
> buf[19] = 0;
> monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
> src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
This whole memset approach is not necessary. Let's drop this and use a
left-justified format string to do the space padding. Feel free to try
this and send the patch:
diff --git a/slirp/misc.c b/slirp/misc.c
index 3432fbf..0308a62 100644
--- a/slirp/misc.c
+++ b/slirp/misc.c
@@ -333,7 +333,6 @@ void slirp_connection_info(Slirp *slirp, Monitor *mon)
struct socket *so;
const char *state;
char buf[20];
- int n;
monitor_printf(mon, " Protocol[State] FD Source Address Port "
"Dest. Address Port RecvQ SendQ\n");
@@ -357,10 +356,8 @@ void slirp_connection_info(Slirp *slirp, Monitor *mon)
dst_addr = so->so_faddr;
dst_port = so->so_fport;
}
- n = snprintf(buf, sizeof(buf), " TCP[%s]", state);
- memset(&buf[n], ' ', 19 - n);
- buf[19] = 0;
- monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
+ snprintf(buf, sizeof(buf), " TCP[%s]", state);
+ monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
ntohs(src.sin_port));
monitor_printf(mon, "%15s %5d %5d %5d\n",
@@ -370,22 +367,20 @@ void slirp_connection_info(Slirp *slirp, Monitor *mon)
for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
if (so->so_state & SS_HOSTFWD) {
- n = snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
+ snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
src_len = sizeof(src);
getsockname(so->s, (struct sockaddr *)&src, &src_len);
dst_addr = so->so_laddr;
dst_port = so->so_lport;
} else {
- n = snprintf(buf, sizeof(buf), " UDP[%d sec]",
+ snprintf(buf, sizeof(buf), " UDP[%d sec]",
(so->so_expire - curtime) / 1000);
src.sin_addr = so->so_laddr;
src.sin_port = so->so_lport;
dst_addr = so->so_faddr;
dst_port = so->so_fport;
}
- memset(&buf[n], ' ', 19 - n);
- buf[19] = 0;
- monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
+ monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
ntohs(src.sin_port));
monitor_printf(mon, "%15s %5d %5d %5d\n",
@@ -394,13 +389,11 @@ void slirp_connection_info(Slirp *slirp, Monitor *mon)
}
for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
- n = snprintf(buf, sizeof(buf), " ICMP[%d sec]",
+ snprintf(buf, sizeof(buf), " ICMP[%d sec]",
(so->so_expire - curtime) / 1000);
src.sin_addr = so->so_laddr;
dst_addr = so->so_faddr;
- memset(&buf[n], ' ', 19 - n);
- buf[19] = 0;
- monitor_printf(mon, "%s %3d %15s - ", buf, so->s,
+ monitor_printf(mon, "%-19s %3d %15s - ", buf, so->s,
src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
monitor_printf(mon, "%15s - %5d %5d\n", inet_ntoa(dst_addr),
so->so_rcv.sb_cc, so->so_snd.sb_cc);