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libbio: remove breadn.c

--- a/sys/src/libbio/breadn.c

+++ /dev/null

@@ -1,26 +1,0 @@

-#include <u.h>

-#include <libc.h>

-#include <bio.h>

-

-long

-Breadn(Biobufhdr *bp, void *data, long len)

-{

-	char *e, *p;

-	int n;

-

-	p = data;

-	e = p + len;

-	if(e < p){

-		Berror(bp, "invalid read length");

-		return -1;

-	}

-	while(p < e){

-		if((n = Bread(bp, p, e - p)) <= 0){

-			if(n < 0 && p == data)

-				return -1;

-			break;

-		}

-		p += n;

-	}

-	return p - (char*)data;

-}

--- a/sys/src/libbio/mkfile

+++ b/sys/src/libbio/mkfile

@@ -17,7 +17,6 @@

 	brdline.$O\

 	brdstr.$O\

 	bread.$O\

-	breadn.$O\

 	bseek.$O\

 	bwrite.$O\

 	bvprint.$O\

-- 

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