/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <stdio.h> #include <string.h> #include "local.h" #include "fvwrite.h" /* * Write some memory regions. Return zero on success, EOF on error. * * This routine is large and unsightly, but most of the ugliness due * to the three different kinds of output buffering is handled here. */ int __sfvwrite(fp, uio) register FILE *fp; register struct __suio *uio; { register size_t len; register char *p; register struct __siov *iov; register int w, s; char *nl; int nlknown, nldist; if ((len = uio->uio_resid) == 0) return (0); /* make sure we can write */ if (cantwrite(fp)) return (EOF); #define MIN(a, b) ((a) < (b) ? (a) : (b)) #define COPY(n) (void)memcpy((void *)fp->_p, (void *)p, (size_t)(n)) iov = uio->uio_iov; p = iov->iov_base; len = iov->iov_len; iov++; #define GETIOV(extra_work) \ while (len == 0) { \ extra_work; \ p = iov->iov_base; \ len = iov->iov_len; \ iov++; \ } if (fp->_flags & __SNBF) { /* * Unbuffered: write up to BUFSIZ bytes at a time. */ do { GETIOV(;); w = (*fp->_write)(fp->_cookie, p, MIN(len, BUFSIZ)); if (w <= 0) goto err; p += w; len -= w; } while ((uio->uio_resid -= w) != 0); } else if ((fp->_flags & __SLBF) == 0) { /* * Fully buffered: fill partially full buffer, if any, * and then flush. If there is no partial buffer, write * one _bf._size byte chunk directly (without copying). * * String output is a special case: write as many bytes * as fit, but pretend we wrote everything. This makes * snprintf() return the number of bytes needed, rather * than the number used, and avoids its write function * (so that the write function can be invalid). */ do { GETIOV(;); w = fp->_w; if (fp->_flags & __SSTR) { if (len < w) w = len; COPY(w); /* copy MIN(fp->_w,len), */ fp->_w -= w; fp->_p += w; w = len; /* but pretend copied all */ } else if (fp->_p > fp->_bf._base && len > w) { /* fill and flush */ COPY(w); /* fp->_w -= w; */ /* unneeded */ fp->_p += w; if (fflush(fp)) goto err; } else if (len >= (w = fp->_bf._size)) { /* write directly */ w = (*fp->_write)(fp->_cookie, p, w); if (w <= 0) goto err; } else { /* fill and done */ w = len; COPY(w); fp->_w -= w; fp->_p += w; } p += w; len -= w; } while ((uio->uio_resid -= w) != 0); } else { /* * Line buffered: like fully buffered, but we * must check for newlines. Compute the distance * to the first newline (including the newline), * or `infinity' if there is none, then pretend * that the amount to write is MIN(len,nldist). */ nlknown = 0; nldist = 0; /* XXX just to keep gcc happy */ do { GETIOV(nlknown = 0); if (!nlknown) { nl = memchr((void *)p, '\n', len); nldist = nl ? nl + 1 - p : len + 1; nlknown = 1; } s = MIN(len, nldist); w = fp->_w + fp->_bf._size; if (fp->_p > fp->_bf._base && s > w) { COPY(w); /* fp->_w -= w; */ fp->_p += w; if (fflush(fp)) goto err; } else if (s >= (w = fp->_bf._size)) { w = (*fp->_write)(fp->_cookie, p, w); if (w <= 0) goto err; } else { w = s; COPY(w); fp->_w -= w; fp->_p += w; } if ((nldist -= w) == 0) { /* copied the newline: flush and forget */ if (fflush(fp)) goto err; nlknown = 0; } p += w; len -= w; } while ((uio->uio_resid -= w) != 0); } return (0); err: fp->_flags |= __SERR; return (EOF); }