1 /* Copyright (C) 1991, 1992, 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
24 /* Write data pointed by the buffers described by VECTOR, which
25 is a vector of COUNT `struct iovec's, to file descriptor FD.
26 The data is written in the order specified.
27 Operates just like `write' (see <unistd.h>) except that the data
28 are taken from VECTOR instead of a contiguous buffer. */
30 __writev (fd
, vector
, count
)
32 const struct iovec
*vector
;
37 size_t bytes
, to_copy
;
40 /* Find the total number of bytes to be written. */
42 for (i
= 0; i
< count
; ++i
)
43 bytes
+= vector
[i
].iov_len
;
45 /* Allocate a temporary buffer to hold the data. */
46 buffer
= (char *) __alloca (bytes
);
48 /* Copy the data into BUFFER. */
51 for (i
= 0; i
< count
; ++i
)
53 #define min(a, b) ((a) > (b) ? (b) : (a))
54 size_t copy
= min (vector
[i
].iov_len
, to_copy
);
56 bp
= __mempcpy ((void *) bp
, (void *) vector
[i
].iov_base
, copy
);
63 return __write (fd
, buffer
, bytes
);
66 weak_alias (__writev
, writev
)