/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ #include "libbb.h" /* * Write all of the supplied buffer out to a file. * This does multiple writes as necessary. * Returns the amount written, or -1 on an error. */ ssize_t FAST_FUNC full_write(int fd, const void *buf, size_t len) { ssize_t cc; ssize_t total; total = 0; while (len) { cc = safe_write(fd, buf, len); if (cc < 0) { if (total) { /* we already wrote some! */ /* user can do another write to know the error code */ return total; } return cc; /* write() returns -1 on failure. */ } total += cc; buf = ((const char *)buf) + cc; len -= cc; } return total; }