91 lines
2.1 KiB
C
91 lines
2.1 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) 1999-2003 by Erik Andersen <andersen@codepoet.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 <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.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 size is 0 copy until EOF */
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static size_t bb_full_fd_action(int src_fd, int dst_fd, const size_t size)
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{
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size_t read_total = 0;
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RESERVE_CONFIG_BUFFER(buffer,BUFSIZ);
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while ((size == 0) || (read_total < size)) {
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size_t read_try;
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ssize_t read_actual;
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if ((size == 0) || (size - read_total > BUFSIZ)) {
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read_try = BUFSIZ;
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} else {
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read_try = size - read_total;
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}
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read_actual = safe_read(src_fd, buffer, read_try);
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if ((read_actual > 0) && (dst_fd >= 0)) {
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if (bb_full_write(dst_fd, buffer, (size_t) read_actual) != read_actual) {
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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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}
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else if (read_actual == 0) {
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if (size) {
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bb_error_msg("Unable to read all data");
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}
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break;
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} else {
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/* read_actual < 0 */
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bb_perror_msg("Read error");
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break;
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}
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read_total += read_actual;
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}
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RELEASE_CONFIG_BUFFER(buffer);
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return(read_total);
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}
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extern int bb_copyfd_size(int fd1, int fd2, const off_t size)
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{
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if (size) {
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return(bb_full_fd_action(fd1, fd2, size));
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}
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return(0);
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}
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extern int bb_copyfd_eof(int fd1, int fd2)
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{
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return(bb_full_fd_action(fd1, fd2, 0));
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}
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