158f0484fSRodney W. Grimes /*- 258f0484fSRodney W. Grimes * Copyright (c) 1990, 1993 358f0484fSRodney W. Grimes * The Regents of the University of California. All rights reserved. 458f0484fSRodney W. Grimes * 558f0484fSRodney W. Grimes * This code is derived from software contributed to Berkeley by 658f0484fSRodney W. Grimes * Chris Torek. 758f0484fSRodney W. Grimes * 858f0484fSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 958f0484fSRodney W. Grimes * modification, are permitted provided that the following conditions 1058f0484fSRodney W. Grimes * are met: 1158f0484fSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 1258f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 1358f0484fSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 1458f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 1558f0484fSRodney W. Grimes * documentation and/or other materials provided with the distribution. 161d8053c5SEd Maste * 3. Neither the name of the University nor the names of its contributors 1758f0484fSRodney W. Grimes * may be used to endorse or promote products derived from this software 1858f0484fSRodney W. Grimes * without specific prior written permission. 1958f0484fSRodney W. Grimes * 2058f0484fSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2158f0484fSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2258f0484fSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2358f0484fSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2458f0484fSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2558f0484fSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2658f0484fSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2758f0484fSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2858f0484fSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2958f0484fSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3058f0484fSRodney W. Grimes * SUCH DAMAGE. 3158f0484fSRodney W. Grimes */ 3258f0484fSRodney W. Grimes 3358f0484fSRodney W. Grimes #if defined(LIBC_SCCS) && !defined(lint) 3458f0484fSRodney W. Grimes static char sccsid[] = "@(#)fgetln.c 8.2 (Berkeley) 1/2/94"; 3558f0484fSRodney W. Grimes #endif /* LIBC_SCCS and not lint */ 36333fc21eSDavid E. O'Brien #include <sys/cdefs.h> 37333fc21eSDavid E. O'Brien __FBSDID("$FreeBSD$"); 3858f0484fSRodney W. Grimes 3929ac6bd2SDaniel Eischen #include "namespace.h" 4020055d76SPedro F. Giffuni #include <errno.h> 4120055d76SPedro F. Giffuni #include <limits.h> 4258f0484fSRodney W. Grimes #include <stdio.h> 4358f0484fSRodney W. Grimes #include <stdlib.h> 4458f0484fSRodney W. Grimes #include <string.h> 4529ac6bd2SDaniel Eischen #include "un-namespace.h" 4629ac6bd2SDaniel Eischen #include "libc_private.h" 4758f0484fSRodney W. Grimes #include "local.h" 4858f0484fSRodney W. Grimes 4958f0484fSRodney W. Grimes /* 5058f0484fSRodney W. Grimes * Expand the line buffer. Return -1 on error. 5158f0484fSRodney W. Grimes #ifdef notdef 5258f0484fSRodney W. Grimes * The `new size' does not account for a terminating '\0', 5358f0484fSRodney W. Grimes * so we add 1 here. 5458f0484fSRodney W. Grimes #endif 5558f0484fSRodney W. Grimes */ 5666d56cb7STim J. Robbins int 5766d56cb7STim J. Robbins __slbexpand(FILE *fp, size_t newsize) 5858f0484fSRodney W. Grimes { 5958f0484fSRodney W. Grimes void *p; 6058f0484fSRodney W. Grimes 6158f0484fSRodney W. Grimes #ifdef notdef 6258f0484fSRodney W. Grimes ++newsize; 6358f0484fSRodney W. Grimes #endif 6458f0484fSRodney W. Grimes if (fp->_lb._size >= newsize) 6558f0484fSRodney W. Grimes return (0); 6620055d76SPedro F. Giffuni if (newsize > INT_MAX) { 6720055d76SPedro F. Giffuni errno = ENOMEM; 6820055d76SPedro F. Giffuni return (-1); 6920055d76SPedro F. Giffuni } 7058f0484fSRodney W. Grimes if ((p = realloc(fp->_lb._base, newsize)) == NULL) 7158f0484fSRodney W. Grimes return (-1); 7258f0484fSRodney W. Grimes fp->_lb._base = p; 7358f0484fSRodney W. Grimes fp->_lb._size = newsize; 7458f0484fSRodney W. Grimes return (0); 7558f0484fSRodney W. Grimes } 7658f0484fSRodney W. Grimes 7758f0484fSRodney W. Grimes /* 7858f0484fSRodney W. Grimes * Get an input line. The returned pointer often (but not always) 7958f0484fSRodney W. Grimes * points into a stdio buffer. Fgetln does not alter the text of 8058f0484fSRodney W. Grimes * the returned line (which is thus not a C string because it will 8158f0484fSRodney W. Grimes * not necessarily end with '\0'), but does allow callers to modify 8258f0484fSRodney W. Grimes * it if they wish. Thus, we set __SMOD in case the caller does. 8358f0484fSRodney W. Grimes */ 8458f0484fSRodney W. Grimes char * 8529ac6bd2SDaniel Eischen fgetln(FILE *fp, size_t *lenp) 8658f0484fSRodney W. Grimes { 8729ac6bd2SDaniel Eischen unsigned char *p; 8829ac6bd2SDaniel Eischen size_t len; 8958f0484fSRodney W. Grimes size_t off; 9058f0484fSRodney W. Grimes 9129ac6bd2SDaniel Eischen FLOCKFILE(fp); 9287a6c90aSTim J. Robbins ORIENT(fp, -1); 9358f0484fSRodney W. Grimes /* make sure there is input */ 9458f0484fSRodney W. Grimes if (fp->_r <= 0 && __srefill(fp)) { 9558f0484fSRodney W. Grimes *lenp = 0; 9629ac6bd2SDaniel Eischen FUNLOCKFILE(fp); 9758f0484fSRodney W. Grimes return (NULL); 9858f0484fSRodney W. Grimes } 9958f0484fSRodney W. Grimes 10058f0484fSRodney W. Grimes /* look for a newline in the input */ 101ce51cf03SJames Raynard if ((p = memchr((void *)fp->_p, '\n', (size_t)fp->_r)) != NULL) { 10229ac6bd2SDaniel Eischen char *ret; 10358f0484fSRodney W. Grimes 10458f0484fSRodney W. Grimes /* 10558f0484fSRodney W. Grimes * Found one. Flag buffer as modified to keep fseek from 10658f0484fSRodney W. Grimes * `optimising' a backward seek, in case the user stomps on 10758f0484fSRodney W. Grimes * the text. 10858f0484fSRodney W. Grimes */ 10958f0484fSRodney W. Grimes p++; /* advance over it */ 11058f0484fSRodney W. Grimes ret = (char *)fp->_p; 11158f0484fSRodney W. Grimes *lenp = len = p - fp->_p; 11258f0484fSRodney W. Grimes fp->_flags |= __SMOD; 11358f0484fSRodney W. Grimes fp->_r -= len; 11458f0484fSRodney W. Grimes fp->_p = p; 11529ac6bd2SDaniel Eischen FUNLOCKFILE(fp); 11658f0484fSRodney W. Grimes return (ret); 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 16629ac6bd2SDaniel Eischen FUNLOCKFILE(fp); 16758f0484fSRodney W. Grimes return ((char *)fp->_lb._base); 16858f0484fSRodney W. Grimes 16958f0484fSRodney W. Grimes error: 17058f0484fSRodney W. Grimes *lenp = 0; /* ??? */ 17120055d76SPedro F. Giffuni fp->_flags |= __SERR; 17229ac6bd2SDaniel Eischen FUNLOCKFILE(fp); 17358f0484fSRodney W. Grimes return (NULL); /* ??? */ 17458f0484fSRodney W. Grimes } 175