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ref: 7d3cc1c55a435bd9e3d37d9bf8a9299ea9e1f87e
parent: d4bc9052beb3305d64a353a16641740380eb87af
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Sun Jun 23 18:35:14 EDT 2019 

ape: revert rename() change

new implementation gets stuck in a infinite loop. backing
this out for now.


--- a/sys/src/ape/lib/ap/plan9/rename.c
+++ b/sys/src/ape/lib/ap/plan9/rename.c
@@ -10,7 +10,7 @@
 int
 rename(const char *from, const char *to)
 {
-	int n, ffd, tfd;
+	int n, i;
 	char *f, *t;
 	Dir *d, nd;
 
@@ -31,45 +31,45 @@
 	}
 	f = strrchr(from, '/');
 	t = strrchr(to, '/');
-	f = f? f+1 : (char*)from;
-	t = t? t+1 : (char*)to;
+	f = f? f+1 : from;
+	t = t? t+1 : to;
+	n = 0;
 	if(f-from==t-to && strncmp(from, to, f-from)==0){
 		/* from and to are in same directory (we miss some cases) */
+		i = strlen(t);
 		_nulldir(&nd);
 		nd.name = t;
 		if(_dirwstat(from, &nd) < 0){
 			_syserrno();
-			return -1;
+			n = -1;
 		}
 	}else{
 		/* different directories: have to copy */
+		int ffd, tfd;
 		char buf[8192];
 
-
-		if((ffd = _OPEN(from, OREAD)) == -1)
-			goto err1;
-		if((tfd = _CREATE(to, OWRITE, d->mode)) == -1)
-			goto err2;
-		n = 0;
-		while(n>=0){
-			if((n = _READ(ffd, buf, sizeof(buf))) == -1)
-				goto err2;
-			if(_WRITE(tfd, buf, n) != n)
-				goto err2;
+		if((ffd = _OPEN(from, OREAD)) < 0 ||
+		   (tfd = _CREATE(to, OWRITE, d->mode)) < 0){
+			_CLOSE(ffd);
+			_syserrno();
+			n = -1;
 		}
+		while(n>=0 && (n = _READ(ffd, buf, sizeof(buf))) > 0)
+			if(_WRITE(tfd, buf, n) != n){
+				_syserrno();
+				n = -1;
+			}
 		_CLOSE(ffd);
 		_CLOSE(tfd);
-		if(_REMOVE(from) < 0)
-			goto err2;
+		if(n>0)
+			n = 0;
+		if(n == 0) {
+			if(_REMOVE(from) < 0){
+				_syserrno();
+				return -1;
+			}
+		}
 	}
 	free(d);
-	return 0;
-
-err2:
-	_CLOSE(tfd);
-err1:
-	_CLOSE(ffd);
-	_syserrno();
-	free(d);
-	return -1;
+	return n;
 }