105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
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/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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FUNCTION
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<<fwrite>>---write array elements
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INDEX
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fwrite
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ANSI_SYNOPSIS
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#include <stdio.h>
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size_t fwrite(const void *<[buf]>, size_t <[size]>,
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size_t <[count]>, FILE *<[fp]>);
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TRAD_SYNOPSIS
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#include <stdio.h>
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size_t fwrite(<[buf]>, <[size]>, <[count]>, <[fp]>)
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char *<[buf]>;
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size_t <[size]>;
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size_t <[count]>;
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FILE *<[fp]>;
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DESCRIPTION
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<<fwrite>> attempts to copy, starting from the memory location
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<[buf]>, <[count]> elements (each of size <[size]>) into the file or
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stream identified by <[fp]>. <<fwrite>> may copy fewer elements than
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<[count]> if an error intervenes.
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<<fwrite>> also advances the file position indicator (if any) for
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<[fp]> by the number of @emph{characters} actually written.
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RETURNS
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If <<fwrite>> succeeds in writing all the elements you specify, the
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result is the same as the argument <[count]>. In any event, the
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result is the number of complete elements that <<fwrite>> copied to
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the file.
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PORTABILITY
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ANSI C requires <<fwrite>>.
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Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
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<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "%W% (Berkeley) %G%";
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#endif /* LIBC_SCCS and not lint */
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#include <stdio.h>
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#include <string.h>
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#if 0
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#include <sys/stdc.h>
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#endif
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#include "local.h"
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#if 1
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#include "fvwrite.h"
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#endif
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/*
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* Write `count' objects (each size `size') from memory to the given file.
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* Return the number of whole objects written.
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*/
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size_t
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_DEFUN (fwrite, (buf, size, count, fp),
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_CONST _PTR buf _AND
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size_t size _AND
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size_t count _AND
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FILE * fp)
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{
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size_t n;
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struct __suio uio;
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struct __siov iov;
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iov.iov_base = buf;
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uio.uio_resid = iov.iov_len = n = count * size;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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/*
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* The usual case is success (__sfvwrite returns 0);
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* skip the divide if this happens, since divides are
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* generally slow and since this occurs whenever size==0.
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*/
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if (__sfvwrite (fp, &uio) == 0)
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return count;
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return (n - uio.uio_resid) / size;
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}
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