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 #ifdef HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #if !HAVE_GETLINE 37 #include <stdlib.h> 38 39 #ifndef HAVE_NBTOOL_CONFIG_H 40 /* These headers are required, but included from nbtool_config.h */ 41 #include <stdio.h> 42 #include <unistd.h> 43 #include <errno.h> 44 #include <string.h> 45 #endif 46 47 ssize_t 48 getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp) 49 { 50 char *ptr, *eptr; 51 52 53 if (*buf == NULL || *bufsiz == 0) { 54 *bufsiz = BUFSIZ; 55 if ((*buf = malloc(*bufsiz)) == NULL) 56 return -1; 57 } 58 59 for (ptr = *buf, eptr = *buf + *bufsiz;;) { 60 int c = fgetc(fp); 61 if (c == -1) { 62 if (feof(fp)) { 63 ssize_t diff = (ssize_t)(ptr - *buf); 64 if (diff != 0) { 65 *ptr = '\0'; 66 return diff; 67 } 68 } 69 return -1; 70 } 71 *ptr++ = c; 72 if (c == delimiter) { 73 *ptr = '\0'; 74 return ptr - *buf; 75 } 76 if (ptr + 2 >= eptr) { 77 char *nbuf; 78 size_t nbufsiz = *bufsiz * 2; 79 ssize_t d = ptr - *buf; 80 if ((nbuf = realloc(*buf, nbufsiz)) == NULL) 81 return -1; 82 *buf = nbuf; 83 *bufsiz = nbufsiz; 84 eptr = nbuf + nbufsiz; 85 ptr = nbuf + d; 86 } 87 } 88 } 89 90 ssize_t 91 getline(char **buf, size_t *bufsiz, FILE *fp) 92 { 93 return getdelim(buf, bufsiz, '\n', fp); 94 } 95 96 #endif 97 98 #ifdef TEST 99 int 100 main(int argc, char *argv[]) 101 { 102 char *p = NULL; 103 ssize_t len; 104 size_t n = 0; 105 106 while ((len = getline(&p, &n, stdin)) != -1) 107 (void)printf("%zd %s", len, p); 108 free(p); 109 return 0; 110 } 111 #endif 112