/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) 1999-2004 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 <errno.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "busybox.h" #if BUFSIZ < 4096 #undef BUFSIZ #define BUFSIZ 4096 #endif /* If size is 0 copy until EOF */ static size_t bb_full_fd_action(int src_fd, int dst_fd, const size_t size) { size_t read_total = 0; RESERVE_CONFIG_BUFFER(buffer,BUFSIZ); while ((size == 0) || (read_total < size)) { size_t read_try; ssize_t read_actual; if ((size == 0) || (size - read_total > BUFSIZ)) { read_try = BUFSIZ; } else { read_try = size - read_total; } read_actual = safe_read(src_fd, buffer, read_try); if (read_actual > 0) { if ((dst_fd >= 0) && (bb_full_write(dst_fd, buffer, (size_t) read_actual) != read_actual)) { bb_perror_msg(bb_msg_write_error); /* match Read error below */ break; } } else if (read_actual == 0) { if (size) { bb_error_msg("Unable to read all data"); } break; } else { /* read_actual < 0 */ bb_perror_msg("Read error"); break; } read_total += read_actual; } RELEASE_CONFIG_BUFFER(buffer); return(read_total); } extern int bb_copyfd_size(int fd1, int fd2, const off_t size) { if (size) { return(bb_full_fd_action(fd1, fd2, size)); } return(0); } extern int bb_copyfd_eof(int fd1, int fd2) { return(bb_full_fd_action(fd1, fd2, 0)); }