158f0484fSRodney W. Grimes /*- 28a16b7a1SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause 38a16b7a1SPedro F. Giffuni * 458f0484fSRodney W. Grimes * Copyright (c) 1990, 1993 558f0484fSRodney W. Grimes * The Regents of the University of California. All rights reserved. 658f0484fSRodney W. Grimes * 758f0484fSRodney W. Grimes * This code is derived from software contributed to Berkeley by 858f0484fSRodney W. Grimes * Chris Torek. 958f0484fSRodney W. Grimes * 1058f0484fSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 1158f0484fSRodney W. Grimes * modification, are permitted provided that the following conditions 1258f0484fSRodney W. Grimes * are met: 1358f0484fSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 1458f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 1558f0484fSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 1658f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 1758f0484fSRodney W. Grimes * documentation and/or other materials provided with the distribution. 181d8053c5SEd Maste * 3. Neither the name of the University nor the names of its contributors 1958f0484fSRodney W. Grimes * may be used to endorse or promote products derived from this software 2058f0484fSRodney W. Grimes * without specific prior written permission. 2158f0484fSRodney W. Grimes * 2258f0484fSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2358f0484fSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2458f0484fSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2558f0484fSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2658f0484fSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2758f0484fSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2858f0484fSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2958f0484fSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3058f0484fSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3158f0484fSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3258f0484fSRodney W. Grimes * SUCH DAMAGE. 3358f0484fSRodney W. Grimes */ 3458f0484fSRodney W. Grimes 3558f0484fSRodney W. Grimes #if defined(LIBC_SCCS) && !defined(lint) 3658f0484fSRodney W. Grimes static char sccsid[] = "@(#)fgetln.c 8.2 (Berkeley) 1/2/94"; 3758f0484fSRodney W. Grimes #endif /* LIBC_SCCS and not lint */ 38333fc21eSDavid E. O'Brien #include <sys/cdefs.h> 39333fc21eSDavid E. O'Brien __FBSDID("$FreeBSD$"); 4058f0484fSRodney W. Grimes 4129ac6bd2SDaniel Eischen #include "namespace.h" 4220055d76SPedro F. Giffuni #include <errno.h> 4320055d76SPedro F. Giffuni #include <limits.h> 4458f0484fSRodney W. Grimes #include <stdio.h> 4558f0484fSRodney W. Grimes #include <stdlib.h> 4658f0484fSRodney W. Grimes #include <string.h> 4729ac6bd2SDaniel Eischen #include "un-namespace.h" 4829ac6bd2SDaniel Eischen #include "libc_private.h" 4958f0484fSRodney W. Grimes #include "local.h" 5058f0484fSRodney W. Grimes 5158f0484fSRodney W. Grimes /* 5258f0484fSRodney W. Grimes * Expand the line buffer. Return -1 on error. 5358f0484fSRodney W. Grimes #ifdef notdef 5458f0484fSRodney W. Grimes * The `new size' does not account for a terminating '\0', 5558f0484fSRodney W. Grimes * so we add 1 here. 5658f0484fSRodney W. Grimes #endif 5758f0484fSRodney W. Grimes */ 5866d56cb7STim J. Robbins int 5966d56cb7STim J. Robbins __slbexpand(FILE *fp, size_t newsize) 6058f0484fSRodney W. Grimes { 6158f0484fSRodney W. Grimes void *p; 6258f0484fSRodney W. Grimes 6358f0484fSRodney W. Grimes #ifdef notdef 6458f0484fSRodney W. Grimes ++newsize; 6558f0484fSRodney W. Grimes #endif 6658f0484fSRodney W. Grimes if (fp->_lb._size >= newsize) 6758f0484fSRodney W. Grimes return (0); 6820055d76SPedro F. Giffuni if (newsize > INT_MAX) { 6920055d76SPedro F. Giffuni errno = ENOMEM; 7020055d76SPedro F. Giffuni return (-1); 7120055d76SPedro F. Giffuni } 7258f0484fSRodney W. Grimes if ((p = realloc(fp->_lb._base, newsize)) == NULL) 7358f0484fSRodney W. Grimes return (-1); 7458f0484fSRodney W. Grimes fp->_lb._base = p; 7558f0484fSRodney W. Grimes fp->_lb._size = newsize; 7658f0484fSRodney W. Grimes return (0); 7758f0484fSRodney W. Grimes } 7858f0484fSRodney W. Grimes 7958f0484fSRodney W. Grimes /* 8058f0484fSRodney W. Grimes * Get an input line. The returned pointer often (but not always) 8158f0484fSRodney W. Grimes * points into a stdio buffer. Fgetln does not alter the text of 8258f0484fSRodney W. Grimes * the returned line (which is thus not a C string because it will 8358f0484fSRodney W. Grimes * not necessarily end with '\0'), but does allow callers to modify 8458f0484fSRodney W. Grimes * it if they wish. Thus, we set __SMOD in case the caller does. 8558f0484fSRodney W. Grimes */ 8658f0484fSRodney W. Grimes char * 8729ac6bd2SDaniel Eischen fgetln(FILE *fp, size_t *lenp) 8858f0484fSRodney W. Grimes { 8929ac6bd2SDaniel Eischen unsigned char *p; 90fda0a14fSKonstantin Belousov char *ret; 9129ac6bd2SDaniel Eischen size_t len; 9258f0484fSRodney W. Grimes size_t off; 9358f0484fSRodney W. Grimes 94fda0a14fSKonstantin Belousov FLOCKFILE_CANCELSAFE(fp); 9587a6c90aSTim J. Robbins ORIENT(fp, -1); 9658f0484fSRodney W. Grimes /* make sure there is input */ 9758f0484fSRodney W. Grimes if (fp->_r <= 0 && __srefill(fp)) { 9858f0484fSRodney W. Grimes *lenp = 0; 99fda0a14fSKonstantin Belousov ret = NULL; 100fda0a14fSKonstantin Belousov goto end; 10158f0484fSRodney W. Grimes } 10258f0484fSRodney W. Grimes 10358f0484fSRodney W. Grimes /* look for a newline in the input */ 104ce51cf03SJames Raynard if ((p = memchr((void *)fp->_p, '\n', (size_t)fp->_r)) != NULL) { 10558f0484fSRodney W. Grimes /* 10658f0484fSRodney W. Grimes * Found one. Flag buffer as modified to keep fseek from 10758f0484fSRodney W. Grimes * `optimising' a backward seek, in case the user stomps on 10858f0484fSRodney W. Grimes * the text. 10958f0484fSRodney W. Grimes */ 11058f0484fSRodney W. Grimes p++; /* advance over it */ 11158f0484fSRodney W. Grimes ret = (char *)fp->_p; 11258f0484fSRodney W. Grimes *lenp = len = p - fp->_p; 11358f0484fSRodney W. Grimes fp->_flags |= __SMOD; 11458f0484fSRodney W. Grimes fp->_r -= len; 11558f0484fSRodney W. Grimes fp->_p = p; 116fda0a14fSKonstantin Belousov goto end; 11758f0484fSRodney W. Grimes } 11858f0484fSRodney W. Grimes 11958f0484fSRodney W. Grimes /* 12058f0484fSRodney W. Grimes * We have to copy the current buffered data to the line buffer. 12158f0484fSRodney W. Grimes * As a bonus, though, we can leave off the __SMOD. 12258f0484fSRodney W. Grimes * 12358f0484fSRodney W. Grimes * OPTIMISTIC is length that we (optimistically) expect will 124b4c19408SEd Maste * accommodate the `rest' of the string, on each trip through the 12558f0484fSRodney W. Grimes * loop below. 12658f0484fSRodney W. Grimes */ 12758f0484fSRodney W. Grimes #define OPTIMISTIC 80 12858f0484fSRodney W. Grimes 12958f0484fSRodney W. Grimes for (len = fp->_r, off = 0;; len += fp->_r) { 13029ac6bd2SDaniel Eischen size_t diff; 13158f0484fSRodney W. Grimes 13258f0484fSRodney W. Grimes /* 13358f0484fSRodney W. Grimes * Make sure there is room for more bytes. Copy data from 13458f0484fSRodney W. Grimes * file buffer to line buffer, refill file and look for 13558f0484fSRodney W. Grimes * newline. The loop stops only when we find a newline. 13658f0484fSRodney W. Grimes */ 13766d56cb7STim J. Robbins if (__slbexpand(fp, len + OPTIMISTIC)) 13858f0484fSRodney W. Grimes goto error; 13958f0484fSRodney W. Grimes (void)memcpy((void *)(fp->_lb._base + off), (void *)fp->_p, 14058f0484fSRodney W. Grimes len - off); 14158f0484fSRodney W. Grimes off = len; 1423e48993cSAndrey A. Chernov if (__srefill(fp)) { 1433e48993cSAndrey A. Chernov if (__sfeof(fp)) 1443e48993cSAndrey A. Chernov break; 1453e48993cSAndrey A. Chernov goto error; 1463e48993cSAndrey A. Chernov } 147ce51cf03SJames Raynard if ((p = memchr((void *)fp->_p, '\n', (size_t)fp->_r)) == NULL) 14858f0484fSRodney W. Grimes continue; 14958f0484fSRodney W. Grimes 15058f0484fSRodney W. Grimes /* got it: finish up the line (like code above) */ 15158f0484fSRodney W. Grimes p++; 15258f0484fSRodney W. Grimes diff = p - fp->_p; 15358f0484fSRodney W. Grimes len += diff; 15466d56cb7STim J. Robbins if (__slbexpand(fp, len)) 15558f0484fSRodney W. Grimes goto error; 15658f0484fSRodney W. Grimes (void)memcpy((void *)(fp->_lb._base + off), (void *)fp->_p, 15758f0484fSRodney W. Grimes diff); 15858f0484fSRodney W. Grimes fp->_r -= diff; 15958f0484fSRodney W. Grimes fp->_p = p; 16058f0484fSRodney W. Grimes break; 16158f0484fSRodney W. Grimes } 16258f0484fSRodney W. Grimes *lenp = len; 16358f0484fSRodney W. Grimes #ifdef notdef 16420055d76SPedro F. Giffuni fp->_lb._base[len] = '\0'; 16558f0484fSRodney W. Grimes #endif 166fda0a14fSKonstantin Belousov ret = (char *)fp->_lb._base; 167fda0a14fSKonstantin Belousov end: 168fda0a14fSKonstantin Belousov FUNLOCKFILE_CANCELSAFE(); 169fda0a14fSKonstantin Belousov return (ret); 17058f0484fSRodney W. Grimes 17158f0484fSRodney W. Grimes error: 17258f0484fSRodney W. Grimes *lenp = 0; /* ??? */ 17320055d76SPedro F. Giffuni fp->_flags |= __SERR; 174fda0a14fSKonstantin Belousov ret = NULL; 175fda0a14fSKonstantin Belousov goto end; 17658f0484fSRodney W. Grimes } 177