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