1/* getdelim.c --- Implementation of replacement getdelim function. 2 Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005, 2006, 2007 Free 3 Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or 6 modify it under the terms of the GNU General Public License as 7 published by the Free Software Foundation; either version 2, or (at 8 your option) any later version. 9 10 This program is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 02110-1301, USA. */ 19 20/* Ported from glibc by Simon Josefsson. */ 21 22#include <config.h> 23 24#include <stdio.h> 25 26#include <limits.h> 27#include <stdlib.h> 28#include <errno.h> 29 30#ifndef SIZE_MAX 31# define SIZE_MAX ((size_t) -1) 32#endif 33#ifndef SSIZE_MAX 34# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2)) 35#endif 36#if !HAVE_FLOCKFILE 37# undef flockfile 38# define flockfile(x) ((void) 0) 39#endif 40#if !HAVE_FUNLOCKFILE 41# undef funlockfile 42# define funlockfile(x) ((void) 0) 43#endif 44 45/* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW. */ 46#ifndef EOVERFLOW 47# define EOVERFLOW E2BIG 48#endif 49 50/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and 51 NUL-terminate it). *LINEPTR is a pointer returned from malloc (or 52 NULL), pointing to *N characters of space. It is realloc'ed as 53 necessary. Returns the number of characters read (not including 54 the null terminator), or -1 on error or EOF. */ 55 56ssize_t 57getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp) 58{ 59 ssize_t result; 60 size_t cur_len = 0; 61 62 if (lineptr == NULL || n == NULL || fp == NULL) 63 { 64 errno = EINVAL; 65 return -1; 66 } 67 68 flockfile (fp); 69 70 if (*lineptr == NULL || *n == 0) 71 { 72 *n = 120; 73 *lineptr = (char *) realloc (*lineptr, *n); 74 if (*lineptr == NULL) 75 { 76 result = -1; 77 goto unlock_return; 78 } 79 } 80 81 for (;;) 82 { 83 int i; 84 85 i = getc (fp); 86 if (i == EOF) 87 { 88 result = -1; 89 break; 90 } 91 92 /* Make enough space for len+1 (for final NUL) bytes. */ 93 if (cur_len + 1 >= *n) 94 { 95 size_t needed_max = 96 SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX; 97 size_t needed = 2 * *n + 1; /* Be generous. */ 98 char *new_lineptr; 99 100 if (needed_max < needed) 101 needed = needed_max; 102 if (cur_len + 1 >= needed) 103 { 104 result = -1; 105 errno = EOVERFLOW; 106 goto unlock_return; 107 } 108 109 new_lineptr = (char *) realloc (*lineptr, needed); 110 if (new_lineptr == NULL) 111 { 112 result = -1; 113 goto unlock_return; 114 } 115 116 *lineptr = new_lineptr; 117 *n = needed; 118 } 119 120 (*lineptr)[cur_len] = i; 121 cur_len++; 122 123 if (i == delimiter) 124 break; 125 } 126 (*lineptr)[cur_len] = '\0'; 127 result = cur_len ? cur_len : result; 128 129 unlock_return: 130 funlockfile (fp); /* doesn't set errno */ 131 132 return result; 133} 134