mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 09:01:07 +00:00
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
|
/* Copyright (C) 1991, 1992 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 Library General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2 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
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
||
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
||
|
|
Cambridge, MA 02139, USA. */
|
||
|
|
|
||
|
|
#include <ansidecl.h>
|
||
|
|
#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. */
|
||
|
|
int
|
||
|
|
DEFUN(writev, (fd, vector, count),
|
||
|
|
int fd AND CONST struct iovec *vector AND size_t count)
|
||
|
|
{
|
||
|
|
char *buffer;
|
||
|
|
register char *bp;
|
||
|
|
size_t bytes, to_copy;
|
||
|
|
register size_t 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);
|
||
|
|
|
||
|
|
(void) memcpy((PTR) bp, (PTR) vector[i].iov_base, copy);
|
||
|
|
|
||
|
|
bp += copy;
|
||
|
|
to_copy -= copy;
|
||
|
|
if (bytes == 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return write(fd, buffer, bytes);
|
||
|
|
}
|