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git/pack: show percentage instead of random number of dots

--- a/pack.c

+++ b/pack.c

@@ -938,7 +938,7 @@

 indexpack(char *pack, char *idx, Hash ph)

 {

 	char hdr[4*3], buf[8];

-	int nobj, nvalid, nbig, n, i, step;

+	int nobj, nvalid, nbig, n, i, pcnt, x;

 	Object *o, **objects;

 	DigestState *st;

 	char *valid;

@@ -961,19 +961,21 @@

 	nobj = GETBE32(hdr + 8);

 	objects = calloc(nobj, sizeof(Object*));

 	valid = calloc(nobj, sizeof(char));

-	step = nobj/100;

-	if(!step)

-		step++;

 	while(nvalid != nobj){

-		fprint(2, "indexing (%d/%d):", nvalid, nobj);

+		fprint(2, "indexing %d objects:   0%%", nobj-nvalid);

 		n = 0;

+		pcnt = 0;

 		for(i = 0; i < nobj; i++){

 			if(valid[i]){

 				n++;

 				continue;

 			}

-			if(i % step == 0)

-				fprint(2, ".");

+			x = (i*100) / nobj;

+			if(x > pcnt){

+				pcnt = x;

+				if(pcnt%10 == 0)

+					fprint(2, "\b\b\b\b%3d%%", pcnt);

+			}

 			if(objects[i] == nil){

 				o = emalloc(sizeof(Object));

 				o->off = Boffset(f);

@@ -993,7 +995,7 @@

 			if(objectcrc(f, o) == -1)

 				return -1;

 		}

-		fprint(2, "\n");

+		fprint(2, "\b\b\b\b100%%\n");

 		if(n == nvalid){

 			sysfatal("fix point reached too early: %d/%d: %r", nvalid, nobj);

 			goto error;