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#include "lib.h"
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include "sys9.h"
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#include "dir.h"
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int
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rename(const char *from, const char *to)
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{
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	int n;
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	char *f, *t;
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	Dir *d, nd;
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	if(access(to, 0) >= 0){
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		if(_REMOVE(to) < 0){
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			_syserrno();
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			return -1;
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		}
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	}
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	if((d = _dirstat(to)) != nil){
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		free(d);
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		errno = EEXIST;
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		return -1;
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	}
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	if((d = _dirstat(from)) == nil){
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		_syserrno();
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		return -1;
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	}
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	f = strrchr(from, '/');
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	t = strrchr(to, '/');
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	f = f? f+1 : (char *)from;
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	t = t? t+1 : (char *)to;
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	n = 0;
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	if(f-from==t-to && strncmp(from, to, f-from)==0){
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		/* from and to are in same directory (we miss some cases) */
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		_nulldir(&nd);
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		nd.name = t;
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		if(_dirwstat(from, &nd) < 0){
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			_syserrno();
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			n = -1;
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		}
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	}else{
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		/* different directories: have to copy */
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		int ffd, tfd;
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		char buf[8192];
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		tfd = -1;
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		if((ffd = _OPEN(from, 0)) < 0 ||
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		   (tfd = _CREATE(to, 1, d->mode)) < 0){
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			_CLOSE(ffd);
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			_syserrno();
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			n = -1;
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		}
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		while(n>=0 && (n = _READ(ffd, buf, 8192)) > 0)
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			if(_WRITE(tfd, buf, n) != n){
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				_syserrno();
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				n = -1;
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			}
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		_CLOSE(ffd);
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		_CLOSE(tfd);
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		if(n>0)
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			n = 0;
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		if(n == 0) {
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			if(_REMOVE(from) < 0){
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				_syserrno();
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				return -1;
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			}
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		}
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	}
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	free(d);
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	return n;
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}