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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [fwrite.c] - Rev 551
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/* * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* FUNCTION <<fwrite>>---write array elements INDEX fwrite INDEX _fwrite_r ANSI_SYNOPSIS #include <stdio.h> size_t fwrite(const void *<[buf]>, size_t <[size]>, size_t <[count]>, FILE *<[fp]>); #include <stdio.h> size_t _fwrite_r(struct _reent *<[ptr]>, const void *<[buf]>, size_t <[size]>, size_t <[count]>, FILE *<[fp]>); TRAD_SYNOPSIS #include <stdio.h> size_t fwrite(<[buf]>, <[size]>, <[count]>, <[fp]>) char *<[buf]>; size_t <[size]>; size_t <[count]>; FILE *<[fp]>; #include <stdio.h> size_t _fwrite_r(<[ptr]>, <[buf]>, <[size]>, <[count]>, <[fp]>) struct _reent *<[ptr]>; char *<[buf]>; size_t <[size]>; size_t <[count]>; FILE *<[fp]>; DESCRIPTION <<fwrite>> attempts to copy, starting from the memory location <[buf]>, <[count]> elements (each of size <[size]>) into the file or stream identified by <[fp]>. <<fwrite>> may copy fewer elements than <[count]> if an error intervenes. <<fwrite>> also advances the file position indicator (if any) for <[fp]> by the number of @emph{characters} actually written. <<_fwrite_r>> is simply the reentrant version of <<fwrite>> that takes an additional reentrant structure argument: <[ptr]>. RETURNS If <<fwrite>> succeeds in writing all the elements you specify, the result is the same as the argument <[count]>. In any event, the result is the number of complete elements that <<fwrite>> copied to the file. PORTABILITY ANSI C requires <<fwrite>>. Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "%W% (Berkeley) %G%"; #endif /* LIBC_SCCS and not lint */ #include <_ansi.h> #include <stdio.h> #include <string.h> #if 0 #include <sys/stdc.h> #endif #include "local.h" #if 1 #include "fvwrite.h" #endif /* * Write `count' objects (each size `size') from memory to the given file. * Return the number of whole objects written. */ size_t _DEFUN(_fwrite_r, (ptr, buf, size, count, fp), struct _reent * ptr _AND _CONST _PTR buf _AND size_t size _AND size_t count _AND FILE * fp) { size_t n; struct __suio uio; struct __siov iov; iov.iov_base = buf; uio.uio_resid = iov.iov_len = n = count * size; uio.uio_iov = &iov; uio.uio_iovcnt = 1; /* * The usual case is success (__sfvwrite_r returns 0); * skip the divide if this happens, since divides are * generally slow and since this occurs whenever size==0. */ CHECK_INIT(ptr, fp); _flockfile (fp); ORIENT (fp, -1); if (__sfvwrite_r (ptr, fp, &uio) == 0) { _funlockfile (fp); return count; } _funlockfile (fp); return (n - uio.uio_resid) / size; } #ifndef _REENT_ONLY size_t _DEFUN(fwrite, (buf, size, count, fp), _CONST _PTR buf _AND size_t size _AND size_t count _AND FILE * fp) { return _fwrite_r (_REENT, buf, size, count, fp); } #endif
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