1/* getdelim.c --- Implementation of replacement getdelim function. 2 Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005, 2006, 2007, 3 2008, 2009 Free 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 3, 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 <stdint.h> 28#include <stdlib.h> 29#include <errno.h> 30 31#ifndef SSIZE_MAX 32# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2)) 33#endif 34 35#if USE_UNLOCKED_IO 36# include "unlocked-io.h" 37# define getc_maybe_unlocked(fp) getc(fp) 38#elif !HAVE_FLOCKFILE || !HAVE_FUNLOCKFILE || !HAVE_DECL_GETC_UNLOCKED 39# undef flockfile 40# undef funlockfile 41# define flockfile(x) ((void) 0) 42# define funlockfile(x) ((void) 0) 43# define getc_maybe_unlocked(fp) getc(fp) 44#else 45# define getc_maybe_unlocked(fp) getc_unlocked(fp) 46#endif 47 48/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and 49 NUL-terminate it). *LINEPTR is a pointer returned from malloc (or 50 NULL), pointing to *N characters of space. It is realloc'ed as 51 necessary. Returns the number of characters read (not including 52 the null terminator), or -1 on error or EOF. */ 53 54ssize_t 55getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp) 56{ 57 ssize_t result; 58 size_t cur_len = 0; 59 60 if (lineptr == NULL || n == NULL || fp == NULL) 61 { 62 errno = EINVAL; 63 return -1; 64 } 65 66 flockfile (fp); 67 68 if (*lineptr == NULL || *n == 0) 69 { 70 char *new_lineptr; 71 *n = 120; 72 new_lineptr = (char *) realloc (*lineptr, *n); 73 if (new_lineptr == NULL) 74 { 75 result = -1; 76 goto unlock_return; 77 } 78 *lineptr = new_lineptr; 79 } 80 81 for (;;) 82 { 83 int i; 84 85 i = getc_maybe_unlocked (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