/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org> * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include <errno.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "libbb.h" #if BUFSIZ < 4096 #undef BUFSIZ #define BUFSIZ 4096 #endif static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size) { int status = -1; off_t total = 0; RESERVE_CONFIG_BUFFER(buffer, BUFSIZ); if (src_fd < 0) goto out; if (!size) { size = BUFSIZ; status = 1; /* copy until eof */ } while (1) { ssize_t rd; rd = safe_read(src_fd, buffer, size > BUFSIZ ? BUFSIZ : size); if (!rd) { /* eof - all done. */ status = 0; break; } if (rd < 0) { bb_perror_msg(bb_msg_read_error); break; } /* dst_fd == -1 is a fake, else... */ if (dst_fd >= 0) { ssize_t wr = full_write(dst_fd, buffer, rd); if (wr < rd) { bb_perror_msg(bb_msg_write_error); break; } } total += rd; if (status < 0) { size -= rd; if (!size) { status = 0; break; } } } out: RELEASE_CONFIG_BUFFER(buffer); return status ? -1 : total; } off_t bb_copyfd_size(int fd1, int fd2, off_t size) { if (size) { return bb_full_fd_action(fd1, fd2, size); } return 0; } off_t bb_copyfd_eof(int fd1, int fd2) { return bb_full_fd_action(fd1, fd2, 0); }