1 /* $NetBSD: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 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 #include "bsdunzip_platform.h" 33 #ifndef HAVE_GETLINE 34 35 #ifdef HAVE_STDLIB_H 36 #include <stdlib.h> 37 #endif 38 #ifdef HAVE_STDIO_H 39 #include <stdio.h> 40 #endif 41 #ifdef HAVE_UNISTD_H 42 #include <unistd.h> 43 #endif 44 #ifdef HAVE_ERRNO_H 45 #include <errno.h> 46 #endif 47 #ifdef HAVE_STRING_H 48 #include <string.h> 49 #endif 50 51 static ssize_t 52 la_getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp) 53 { 54 char *ptr, *eptr; 55 56 57 if (*buf == NULL || *bufsiz == 0) { 58 *bufsiz = BUFSIZ; 59 if ((*buf = malloc(*bufsiz)) == NULL) 60 return -1; 61 } 62 63 for (ptr = *buf, eptr = *buf + *bufsiz;;) { 64 int c = fgetc(fp); 65 if (c == -1) { 66 if (feof(fp)) { 67 ssize_t diff = (ssize_t)(ptr - *buf); 68 if (diff != 0) { 69 *ptr = '\0'; 70 return diff; 71 } 72 } 73 return -1; 74 } 75 *ptr++ = c; 76 if (c == delimiter) { 77 *ptr = '\0'; 78 return ptr - *buf; 79 } 80 if (ptr + 2 >= eptr) { 81 char *nbuf; 82 size_t nbufsiz = *bufsiz * 2; 83 ssize_t d = ptr - *buf; 84 if ((nbuf = realloc(*buf, nbufsiz)) == NULL) 85 return -1; 86 *buf = nbuf; 87 *bufsiz = nbufsiz; 88 eptr = nbuf + nbufsiz; 89 ptr = nbuf + d; 90 } 91 } 92 } 93 94 ssize_t 95 getline(char **buf, size_t *bufsiz, FILE *fp) 96 { 97 return la_getdelim(buf, bufsiz, '\n', fp); 98 } 99 #endif 100