glibc/sysdeps/posix/writev.c
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

68 lines
2.0 KiB
C

/* Copyright (C) 1991, 1992, 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/uio.h>
/* Write data pointed by the buffers described by VECTOR, which
is a vector of COUNT `struct iovec's, to file descriptor FD.
The data is written in the order specified.
Operates just like `write' (see <unistd.h>) except that the data
are taken from VECTOR instead of a contiguous buffer. */
ssize_t
__writev (fd, vector, count)
int fd;
const struct iovec *vector;
int count;
{
char *buffer;
register char *bp;
size_t bytes, to_copy;
int i;
/* Find the total number of bytes to be written. */
bytes = 0;
for (i = 0; i < count; ++i)
bytes += vector[i].iov_len;
/* Allocate a temporary buffer to hold the data. */
buffer = (char *) __alloca (bytes);
/* Copy the data into BUFFER. */
to_copy = bytes;
bp = buffer;
for (i = 0; i < count; ++i)
{
#define min(a, b) ((a) > (b) ? (b) : (a))
size_t copy = min (vector[i].iov_len, to_copy);
bp = __mempcpy ((void *) bp, (void *) vector[i].iov_base, copy);
to_copy -= copy;
if (to_copy == 0)
break;
}
return __write (fd, buffer, bytes);
}
#ifndef __writev
weak_alias (__writev, writev)
#endif