/* 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 ssize_t bb_full_fd_action(int src_fd, int dst_fd, size_t size) { int status = -1; size_t total = 0; RESERVE_CONFIG_BUFFER(buffer,BUFSIZ); if (src_fd < 0) goto out; while (!size || total < size) { ssize_t wrote, xread; xread = safe_read(src_fd, buffer, (!size || size - total > BUFSIZ) ? BUFSIZ : size - total); if (xread > 0) { /* A -1 dst_fd means we need to fake it... */ wrote = (dst_fd < 0) ? xread : bb_full_write(dst_fd, buffer, xread); if (wrote < xread) { bb_perror_msg(bb_msg_write_error); break; } total += wrote; if (total == size) status = 0; } else if (xread < 0) { bb_perror_msg(bb_msg_read_error); break; } else if (xread == 0) { /* All done. */ status = 0; break; } } out: RELEASE_CONFIG_BUFFER(buffer); return status ? status : (ssize_t)total; } int bb_copyfd_size(int fd1, int fd2, const off_t size) { if (size) { return(bb_full_fd_action(fd1, fd2, size)); } return(0); } int bb_copyfd_eof(int fd1, int fd2) { return(bb_full_fd_action(fd1, fd2, 0)); }