1 /* $NetBSD: fgetstr.c,v 1.8 2009/10/15 00:36:24 roy Exp $ */ 2 3 /* 4 * Copyright (c) 2009 The NetBSD Foundation, Inc. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Roy Marples. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __RCSID("$NetBSD: fgetstr.c,v 1.8 2009/10/15 00:36:24 roy Exp $"); 32 33 #include "namespace.h" 34 35 #include <assert.h> 36 #include <errno.h> 37 #include <limits.h> 38 #include <stdio.h> 39 40 #include "reentrant.h" 41 #include "local.h" 42 43 /* 44 * Get an input line. 45 * This now uses getdelim(3) for a code reduction. 46 * The upside is that strings are now always NULL terminated, but relying 47 * on this is non portable - better to use the POSIX getdelim(3) function. 48 */ 49 char * 50 __fgetstr(FILE *__restrict fp, size_t *__restrict lenp, int sep) 51 { 52 char *p; 53 size_t size; 54 55 _DIAGASSERT(fp != NULL); 56 _DIAGASSERT(lenp != NULL); 57 58 p = (char *)fp->_lb._base; 59 size = fp->_lb._size; 60 *lenp = __getdelim(&p, &size, sep, fp); 61 fp->_lb._base = (unsigned char *)p; 62 /* The struct size variable is only an int ..... */ 63 if (size > INT_MAX) { 64 fp->_lb._size = INT_MAX; 65 errno = EOVERFLOW; 66 goto error; 67 } 68 fp->_lb._size = (int)size; 69 if (*lenp != 0 && *lenp < SIZE_MAX - 1) 70 return p; 71 error: 72 *lenp = 0; 73 return NULL; 74 } 75