1 /* $Id$ */ 2 /* $NetBSD: fgetln.c,v 1.3 2007/08/07 02:06:58 lukem Exp $ */ 3 4 /* 5 * Copyright (c) 1998 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Christos Zoulas. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/types.h> 37 38 #include <errno.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 43 char * 44 fgetln(FILE *fp, size_t *len) 45 { 46 static char *buf = NULL; 47 static size_t bufsiz = 0; 48 char *ptr; 49 50 51 if (buf == NULL) { 52 bufsiz = BUFSIZ; 53 if ((buf = malloc(bufsiz)) == NULL) 54 return (NULL); 55 } 56 57 if (fgets(buf, bufsiz, fp) == NULL) 58 return (NULL); 59 60 *len = 0; 61 while ((ptr = strchr(&buf[*len], '\n')) == NULL) { 62 size_t nbufsiz = bufsiz + BUFSIZ; 63 char *nbuf = realloc(buf, nbufsiz); 64 65 if (nbuf == NULL) { 66 int oerrno = errno; 67 free(buf); 68 errno = oerrno; 69 buf = NULL; 70 return (NULL); 71 } else 72 buf = nbuf; 73 74 *len = bufsiz; 75 if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) 76 return (buf); 77 78 bufsiz = nbufsiz; 79 } 80 81 *len = (ptr - buf) + 1; 82 return (buf); 83 } 84