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73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include "busybox.h"
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#if BUFSIZ < 4096
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#undef BUFSIZ
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#define BUFSIZ 4096
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#endif
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/* If chunksize is 0 copy until EOF */
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extern int bb_copyfd(int fd1, int fd2, const off_t chunksize)
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{
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ssize_t nread;
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size_t size;
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off_t remaining;
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RESERVE_CONFIG_BUFFER(buffer,BUFSIZ);
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remaining = size = BUFSIZ;
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if (chunksize) {
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remaining = chunksize;
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}
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do {
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if (size > remaining) {
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size = remaining;
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}
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if ((nread = safe_read(fd1, buffer, size)) > 0) {
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if (bb_full_write(fd2, buffer, nread) < 0) {
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bb_perror_msg(bb_msg_write_error); /* match Read error below */
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break;
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}
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if (chunksize && ((remaining -= nread) == 0)) {
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return 0;
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}
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} else if (!nread) {
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if (chunksize) {
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bb_error_msg("Unable to read all data");
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break;
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}
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return 0;
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} else { /* nread < 0 */
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bb_perror_msg("Read error"); /* match bb_msg_write_error above */
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break;
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}
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} while (1);
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return -1;
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}
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