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. 1658f0484fSRodney W. Grimes * 4. 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" 4058f0484fSRodney W. Grimes #include <stdio.h> 4158f0484fSRodney W. Grimes #include <stdlib.h> 4258f0484fSRodney W. Grimes #include <string.h> 4329ac6bd2SDaniel Eischen #include "un-namespace.h" 4429ac6bd2SDaniel Eischen #include "libc_private.h" 4558f0484fSRodney W. Grimes #include "local.h" 4658f0484fSRodney W. Grimes 4758f0484fSRodney W. Grimes /* 4858f0484fSRodney W. Grimes * Expand the line buffer. Return -1 on error. 4958f0484fSRodney W. Grimes #ifdef notdef 5058f0484fSRodney W. Grimes * The `new size' does not account for a terminating '\0', 5158f0484fSRodney W. Grimes * so we add 1 here. 5258f0484fSRodney W. Grimes #endif 5358f0484fSRodney W. Grimes */ 5466d56cb7STim J. Robbins int 5566d56cb7STim J. Robbins __slbexpand(FILE *fp, size_t newsize) 5658f0484fSRodney W. Grimes { 5758f0484fSRodney W. Grimes void *p; 5858f0484fSRodney W. Grimes 5958f0484fSRodney W. Grimes #ifdef notdef 6058f0484fSRodney W. Grimes ++newsize; 6158f0484fSRodney W. Grimes #endif 6258f0484fSRodney W. Grimes if (fp->_lb._size >= newsize) 6358f0484fSRodney W. Grimes return (0); 6458f0484fSRodney W. Grimes if ((p = realloc(fp->_lb._base, newsize)) == NULL) 6558f0484fSRodney W. Grimes return (-1); 6658f0484fSRodney W. Grimes fp->_lb._base = p; 6758f0484fSRodney W. Grimes fp->_lb._size = newsize; 6858f0484fSRodney W. Grimes return (0); 6958f0484fSRodney W. Grimes } 7058f0484fSRodney W. Grimes 7158f0484fSRodney W. Grimes /* 7258f0484fSRodney W. Grimes * Get an input line. The returned pointer often (but not always) 7358f0484fSRodney W. Grimes * points into a stdio buffer. Fgetln does not alter the text of 7458f0484fSRodney W. Grimes * the returned line (which is thus not a C string because it will 7558f0484fSRodney W. Grimes * not necessarily end with '\0'), but does allow callers to modify 7658f0484fSRodney W. Grimes * it if they wish. Thus, we set __SMOD in case the caller does. 7758f0484fSRodney W. Grimes */ 7858f0484fSRodney W. Grimes char * 7929ac6bd2SDaniel Eischen fgetln(FILE *fp, size_t *lenp) 8058f0484fSRodney W. Grimes { 8129ac6bd2SDaniel Eischen unsigned char *p; 8229ac6bd2SDaniel Eischen size_t len; 8358f0484fSRodney W. Grimes size_t off; 8458f0484fSRodney W. Grimes 8529ac6bd2SDaniel Eischen FLOCKFILE(fp); 8687a6c90aSTim J. Robbins ORIENT(fp, -1); 8758f0484fSRodney W. Grimes /* make sure there is input */ 8858f0484fSRodney W. Grimes if (fp->_r <= 0 && __srefill(fp)) { 8958f0484fSRodney W. Grimes *lenp = 0; 9029ac6bd2SDaniel Eischen FUNLOCKFILE(fp); 9158f0484fSRodney W. Grimes return (NULL); 9258f0484fSRodney W. Grimes } 9358f0484fSRodney W. Grimes 9458f0484fSRodney W. Grimes /* look for a newline in the input */ 95ce51cf03SJames Raynard if ((p = memchr((void *)fp->_p, '\n', (size_t)fp->_r)) != NULL) { 9629ac6bd2SDaniel Eischen char *ret; 9758f0484fSRodney W. Grimes 9858f0484fSRodney W. Grimes /* 9958f0484fSRodney W. Grimes * Found one. Flag buffer as modified to keep fseek from 10058f0484fSRodney W. Grimes * `optimising' a backward seek, in case the user stomps on 10158f0484fSRodney W. Grimes * the text. 10258f0484fSRodney W. Grimes */ 10358f0484fSRodney W. Grimes p++; /* advance over it */ 10458f0484fSRodney W. Grimes ret = (char *)fp->_p; 10558f0484fSRodney W. Grimes *lenp = len = p - fp->_p; 10658f0484fSRodney W. Grimes fp->_flags |= __SMOD; 10758f0484fSRodney W. Grimes fp->_r -= len; 10858f0484fSRodney W. Grimes fp->_p = p; 10929ac6bd2SDaniel Eischen FUNLOCKFILE(fp); 11058f0484fSRodney W. Grimes return (ret); 11158f0484fSRodney W. Grimes } 11258f0484fSRodney W. Grimes 11358f0484fSRodney W. Grimes /* 11458f0484fSRodney W. Grimes * We have to copy the current buffered data to the line buffer. 11558f0484fSRodney W. Grimes * As a bonus, though, we can leave off the __SMOD. 11658f0484fSRodney W. Grimes * 11758f0484fSRodney W. Grimes * OPTIMISTIC is length that we (optimistically) expect will 118b4c19408SEd Maste * accommodate the `rest' of the string, on each trip through the 11958f0484fSRodney W. Grimes * loop below. 12058f0484fSRodney W. Grimes */ 12158f0484fSRodney W. Grimes #define OPTIMISTIC 80 12258f0484fSRodney W. Grimes 12358f0484fSRodney W. Grimes for (len = fp->_r, off = 0;; len += fp->_r) { 12429ac6bd2SDaniel Eischen size_t diff; 12558f0484fSRodney W. Grimes 12658f0484fSRodney W. Grimes /* 12758f0484fSRodney W. Grimes * Make sure there is room for more bytes. Copy data from 12858f0484fSRodney W. Grimes * file buffer to line buffer, refill file and look for 12958f0484fSRodney W. Grimes * newline. The loop stops only when we find a newline. 13058f0484fSRodney W. Grimes */ 13166d56cb7STim J. Robbins if (__slbexpand(fp, len + OPTIMISTIC)) 13258f0484fSRodney W. Grimes goto error; 13358f0484fSRodney W. Grimes (void)memcpy((void *)(fp->_lb._base + off), (void *)fp->_p, 13458f0484fSRodney W. Grimes len - off); 13558f0484fSRodney W. Grimes off = len; 13658f0484fSRodney W. Grimes if (__srefill(fp)) 13758f0484fSRodney W. Grimes break; /* EOF or error: return partial line */ 138ce51cf03SJames Raynard if ((p = memchr((void *)fp->_p, '\n', (size_t)fp->_r)) == NULL) 13958f0484fSRodney W. Grimes continue; 14058f0484fSRodney W. Grimes 14158f0484fSRodney W. Grimes /* got it: finish up the line (like code above) */ 14258f0484fSRodney W. Grimes p++; 14358f0484fSRodney W. Grimes diff = p - fp->_p; 14458f0484fSRodney W. Grimes len += diff; 14566d56cb7STim J. Robbins if (__slbexpand(fp, len)) 14658f0484fSRodney W. Grimes goto error; 14758f0484fSRodney W. Grimes (void)memcpy((void *)(fp->_lb._base + off), (void *)fp->_p, 14858f0484fSRodney W. Grimes diff); 14958f0484fSRodney W. Grimes fp->_r -= diff; 15058f0484fSRodney W. Grimes fp->_p = p; 15158f0484fSRodney W. Grimes break; 15258f0484fSRodney W. Grimes } 15358f0484fSRodney W. Grimes *lenp = len; 15458f0484fSRodney W. Grimes #ifdef notdef 15558f0484fSRodney W. Grimes fp->_lb._base[len] = 0; 15658f0484fSRodney W. Grimes #endif 15729ac6bd2SDaniel Eischen FUNLOCKFILE(fp); 15858f0484fSRodney W. Grimes return ((char *)fp->_lb._base); 15958f0484fSRodney W. Grimes 16058f0484fSRodney W. Grimes error: 16158f0484fSRodney W. Grimes *lenp = 0; /* ??? */ 16229ac6bd2SDaniel Eischen FUNLOCKFILE(fp); 16358f0484fSRodney W. Grimes return (NULL); /* ??? */ 16458f0484fSRodney W. Grimes } 165