/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) 1999-2005 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" #include "libbb.h" #if BUFSIZ < 4096 #undef BUFSIZ #define BUFSIZ 4096 #endif static size_t bb_full_fd_action(int src_fd, int dst_fd, const size_t size2) { int status; size_t xread, wrote, total, size = size2; if (src_fd < 0) { return -1; } if (size == 0) { /* If size is 0 copy until EOF */ size = ULONG_MAX; } { RESERVE_CONFIG_BUFFER(buffer,BUFSIZ); total = 0; wrote = 0; status = -1; while (total < size) { xread = BUFSIZ; if (size < (total + BUFSIZ)) xread = size - total; xread = bb_full_read(src_fd, buffer, xread); if (xread > 0) { if (dst_fd < 0) { /* A -1 dst_fd means we need to fake it... */ wrote = xread; } else { wrote = bb_full_write(dst_fd, buffer, xread); } if (wrote < xread) { bb_perror_msg(bb_msg_write_error); break; } total += wrote; } else if (xread < 0) { bb_perror_msg(bb_msg_read_error); break; } else if (xread == 0) { /* All done. */ status = 0; break; } } RELEASE_CONFIG_BUFFER(buffer); } if (status == 0 || total) return total; /* Some sortof error occured */ return -1; } 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)); }