1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2009 Roy Marples <roy (at) marples.name> 4 * All rights reserved 5 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <errno.h> 29 #include <stdint.h> 30 #include <stdlib.h> 31 #include <stdio.h> 32 #include <string.h> 33 34 #include "getline.h" 35 36 /* Redefine a small buffer for our simple text config files */ 37 #undef BUFSIZ 38 #define BUFSIZ 128 39 40 ssize_t 41 getline(char ** __restrict buf, size_t * __restrict buflen, 42 FILE * __restrict fp) 43 { 44 size_t bytes, newlen; 45 char *newbuf, *p; 46 47 if (buf == NULL || buflen == NULL) { 48 errno = EINVAL; 49 return -1; 50 } 51 if (*buf == NULL) 52 *buflen = 0; 53 54 bytes = 0; 55 do { 56 if (feof(fp)) 57 break; 58 if (*buf == NULL || bytes != 0 || *buflen < BUFSIZ) { 59 newlen = *buflen + BUFSIZ; 60 newbuf = realloc(*buf, newlen); 61 if (newbuf == NULL) 62 return -1; 63 *buf = newbuf; 64 *buflen = newlen; 65 } 66 p = *buf + bytes; 67 memset(p, 0, BUFSIZ); 68 if (fgets(p, BUFSIZ, fp) == NULL) 69 break; 70 bytes += strlen(p); 71 } while (bytes == 0 || *(*buf + (bytes - 1)) != '\n'); 72 if (bytes == 0) 73 return -1; 74 return bytes; 75 } 76
