mirror of
https://github.com/sheumann/hush.git
synced 2024-08-19 13:28:57 +00:00
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include "busybox.h"
|
|
|
|
#if BUFSIZ < 4096
|
|
#undef BUFSIZ
|
|
#define BUFSIZ 4096
|
|
#endif
|
|
|
|
/* If chunksize is 0 copy until EOF */
|
|
extern int bb_copyfd(int fd1, int fd2, const off_t chunksize)
|
|
{
|
|
ssize_t nread;
|
|
size_t size;
|
|
off_t remaining;
|
|
RESERVE_CONFIG_BUFFER(buffer,BUFSIZ);
|
|
|
|
remaining = size = BUFSIZ;
|
|
if (chunksize) {
|
|
remaining = chunksize;
|
|
}
|
|
|
|
do {
|
|
if (size > remaining) {
|
|
size = remaining;
|
|
}
|
|
|
|
if ((nread = safe_read(fd1, buffer, size)) > 0) {
|
|
if (bb_full_write(fd2, buffer, nread) < 0) {
|
|
bb_perror_msg(bb_msg_write_error); /* match Read error below */
|
|
break;
|
|
}
|
|
if (chunksize && ((remaining -= nread) == 0)) {
|
|
return 0;
|
|
}
|
|
} else if (!nread) {
|
|
if (chunksize) {
|
|
bb_error_msg("Unable to read all data");
|
|
break;
|
|
}
|
|
return 0;
|
|
} else { /* nread < 0 */
|
|
bb_perror_msg("Read error"); /* match bb_msg_write_error above */
|
|
break;
|
|
}
|
|
|
|
} while (1);
|
|
|
|
return -1;
|
|
}
|