1 /* $NetBSD: fgetln.c,v 1.1 2015/01/22 03:48:07 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #if !HAVE_FGETLN 37 #include <stdlib.h> 38 #ifndef HAVE_NBTOOL_CONFIG_H 39 /* These headers are required, but included from nbtool_config.h */ 40 #include <stdio.h> 41 #include <unistd.h> 42 #include <errno.h> 43 #include <string.h> 44 #endif 45 46 char * 47 fgetln(FILE *fp, size_t *len) 48 { 49 static char *buf = NULL; 50 static size_t bufsiz = 0; 51 char *ptr; 52 53 54 if (buf == NULL) { 55 bufsiz = BUFSIZ; 56 if ((buf = malloc(bufsiz)) == NULL) 57 return NULL; 58 } 59 60 if (fgets(buf, bufsiz, fp) == NULL) 61 return NULL; 62 63 *len = 0; 64 while ((ptr = strchr(&buf[*len], '\n')) == NULL) { 65 size_t nbufsiz = bufsiz + BUFSIZ; 66 char *nbuf = realloc(buf, nbufsiz); 67 68 if (nbuf == NULL) { 69 int oerrno = errno; 70 free(buf); 71 errno = oerrno; 72 buf = NULL; 73 return NULL; 74 } else 75 buf = nbuf; 76 77 if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) { 78 buf[bufsiz] = '\0'; 79 *len = strlen(buf); 80 return buf; 81 } 82 83 *len = bufsiz; 84 bufsiz = nbufsiz; 85 } 86 87 *len = (ptr - buf) + 1; 88 return buf; 89 } 90 91 #endif 92 93 #ifdef TEST 94 int 95 main(int argc, char *argv[]) 96 { 97 char *p; 98 size_t len; 99 100 while ((p = fgetln(stdin, &len)) != NULL) { 101 (void)printf("%zu %s", len, p); 102 free(p); 103 } 104 return 0; 105 } 106 #endif 107