1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #if defined(LIBC_SCCS) && !defined(lint) 12 static char sccsid[] = "@(#)fwrite.c 5.5 (Berkeley) 02/24/91"; 13 #endif /* LIBC_SCCS and not lint */ 14 15 #include <stdio.h> 16 #include "local.h" 17 #include "fvwrite.h" 18 19 /* 20 * Write `count' objects (each size `size') from memory to the given file. 21 * Return the number of whole objects written. 22 */ 23 fwrite(buf, size, count, fp) 24 const void *buf; 25 size_t size, count; 26 FILE *fp; 27 { 28 size_t n; 29 struct __suio uio; 30 struct __siov iov; 31 32 iov.iov_base = (void *)buf; 33 uio.uio_resid = iov.iov_len = n = count * size; 34 uio.uio_iov = &iov; 35 uio.uio_iovcnt = 1; 36 37 /* 38 * The usual case is success (__sfvwrite returns 0); 39 * skip the divide if this happens, since divides are 40 * generally slow and since this occurs whenever size==0. 41 */ 42 if (__sfvwrite(fp, &uio) == 0) 43 return (count); 44 return ((n - uio.uio_resid) / size); 45 } 46