add -S flag to print size of symbol

R=r
DELTA=24  (15 added, 0 deleted, 9 changed)
OCL=34447
CL=34458

src/cmd/nm/nm.c

@@ -50,6 +50,7 @@ int	gflag;
 int	hflag;
 int	nflag;
 int	sflag;
+int	Sflag;
 int	uflag;
 int	Tflag;
 int	tflag;
@@ -90,6 +91,7 @@ main(int argc, char *argv[])
 	case 'h':	hflag = 1; break;
 	case 'n':	nflag = 1; break;
 	case 's':	sflag = 1; break;
+	case 'S':	nflag = Sflag = 1; break;
 	case 'u':	uflag = 1; break;
 	case 't':	tflag = 1; break;
 	case 'T':	Tflag = 1; break;
@@ -295,7 +297,7 @@ psym(Sym *s, void* p)
 void
 printsyms(Sym **symptr, long nsym)
 {
-	int i, wid;
+	int i, j, wid;
 	Sym *s;
 	char *cp;
 	char path[512];
@@ -325,6 +327,19 @@ printsyms(Sym **symptr, long nsym)
 			Bprint(&bout, "%*llux ", wid, s->value);
 		else
 			Bprint(&bout, "%*s ", wid, "");
+		if(Sflag) {
+			vlong siz;
+
+			siz = 0;
+			for(j=i+1; j<nsym; j++) {
+				if(symptr[j]->type != 'a' && symptr[j]->type != 'p') {
+					siz = symptr[j]->value - s->value;
+					break;
+				}
+			}
+			if(siz > 0)
+				Bprint(&bout, "%*llud ", wid, siz);
+		}
 		Bprint(&bout, "%c %s", s->type, cp);
 		if(tflag && s->gotype)
 			Bprint(&bout, " %*llux", wid, s->gotype);