bugfix:
1. readmach:a wasn't big enough causing readings of 4 billion odd syscalls --
negative numbers were being generated.
2. (marginal) use log10(nproc) to get the # of digits print("%d", nproc).

enhancement:
chop a fqdn down to hostname; useful for "stats -lsef `{echo $sysname} tyty.coraid.com"

Reference: /n/sources/patch/applied/statssyscall
Date: Thu Mar 13 14:58:16 CET 2008
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/stats.c	Thu Mar 13 14:53:19 2008
+++ /sys/src/cmd/stats.c	Thu Mar 13 14:53:17 2008
@@ -54,6 +54,7 @@
 struct Machine
 {
 	char		*name;
+	char		*shortname;
 	int		remote;
 	int		statsfd;
 	int		swapfd;
@@ -67,6 +68,7 @@
 	ulong		devsysstat[10];
 	ulong		prevsysstat[10];
 	int		nproc;
+	int		lgproc;
 	ulong		netetherstats[8];
 	ulong		prevetherstats[8];
 	ulong		batterystats[2];
@@ -594,6 +596,28 @@
 	return readnums(m, nelem(m->devswap), a, 0);
 }
 
+char*
+shortname(char *s)
+{
+	char *p, *e;
+
+	p = estrdup(s);
+	e = strchr(p, '.');
+	if(e)
+		*e = 0;
+	return p;
+}
+
+int
+ilog10(long j)
+{
+	int i;
+
+	for(i = 0; j >= 10; i++)
+		j /= 10;
+	return i;
+}
+	
 int
 initmach(Machine *m, char *name)
 {
@@ -607,6 +631,7 @@
 	else
 		p = name;
 	m->name = estrdup(p);
+	m->shortname = shortname(p);
 	m->remote = (strcmp(p, mysysname) != 0);
 	if(m->remote == 0)
 		strcpy(mpt, "");
@@ -643,6 +668,7 @@
 		m->nproc = n;
 	}else
 		m->nproc = 1;
+	m->lgproc = ilog10(m->nproc);
 
 	snprint(buf, sizeof buf, "%s/net/ether0/stats", mpt);
 	m->etherfd = open(buf, OREAD);
@@ -719,7 +745,7 @@
 readmach(Machine *m, int init)
 {
 	int n, i;
-	ulong a[8];
+	ulong a[nelem(m->devsysstat)];
 	char buf[32];
 
 	if(m->remote && (m->disable || setjmp(catchalarm))){
@@ -733,6 +759,8 @@
 	if (strcmp(m->name, buf) != 0){
 		free(m->name);
 		m->name = estrdup(buf);
+		free(m->shortname);
+		m->shortname = shortname(buf);
 		if(display != nil)	/* else we're still initializing */
 			eresized(0);
 	}
@@ -1084,13 +1112,13 @@
 		draw(screen, Rect(x-1, starty-1, x, screen->r.max.y), display->black, nil, ZP);
 		j = dx/stringwidth(mediumfont, "0");
 		n = mach[i].nproc;
-		if(n>1 && j>=1+3+(n>10)+(n>100)){	/* first char of name + (n) */
-			j -= 3+(n>10)+(n>100);
+		if(n>1 && j>=1+3+mach[i].lgproc){	/* first char of name + (n) */
+			j -= 3+mach[i].lgproc;
 			if(j <= 0)
 				j = 1;
-			snprint(buf, sizeof buf, "%.*s(%d)", j, mach[i].name, n);
+			snprint(buf, sizeof buf, "%.*s(%d)", j, mach[i].shortname, n);
 		}else
-			snprint(buf, sizeof buf, "%.*s", j, mach[i].name);
+			snprint(buf, sizeof buf, "%.*s", j, mach[i].shortname);
 		string(screen, Pt(x+Labspace, screen->r.min.y + Labspace), display->black, ZP, mediumfont, buf);
 	}
 
@@ -1361,8 +1389,6 @@
 		parity = 1-parity;
 		for(i=0; i<nmach*ngraph; i++){
 			graph[i].newvalue(graph[i].mach, &v, &vmax, 0);
-			if (v > 1000000)
-				v = 1000000;	/* cap absurd values */
 			graph[i].update(&graph[i], v, vmax);
 		}
 		flushimage(display, 1);