1/* getdelim.c --- Implementation of replacement getdelim function. 2 Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005, 2006 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 "getdelim.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/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and 46 NUL-terminate it). *LINEPTR is a pointer returned from malloc (or 47 NULL), pointing to *N characters of space. It is realloc'ed as 48 necessary. Returns the number of characters read (not including 49 the null terminator), or -1 on error or EOF. */ 50 51ssize_t 52getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp) 53{ 54 ssize_t result; 55 size_t cur_len = 0; 56 57 if (lineptr == NULL || n == NULL || fp == NULL) 58 { 59 errno = EINVAL; 60 return -1; 61 } 62 63 flockfile (fp); 64 65 if (*lineptr == NULL || *n == 0) 66 { 67 *n = 120; 68 *lineptr = (char *) malloc (*n); 69 if (*lineptr == NULL) 70 { 71 result = -1; 72 goto unlock_return; 73 } 74 } 75 76 for (;;) 77 { 78 int i; 79 80 i = getc (fp); 81 if (i == EOF) 82 { 83 result = -1; 84 break; 85 } 86 87 /* Make enough space for len+1 (for final NUL) bytes. */ 88 if (cur_len + 1 >= *n) 89 { 90 size_t needed_max = 91 SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX; 92 size_t needed = 2 * *n + 1; /* Be generous. */ 93 char *new_lineptr; 94 95 if (needed_max < needed) 96 needed = needed_max; 97 if (cur_len + 1 >= needed) 98 { 99 result = -1; 100 goto unlock_return; 101 } 102 103 new_lineptr = (char *) realloc (*lineptr, needed); 104 if (new_lineptr == NULL) 105 { 106 result = -1; 107 goto unlock_return; 108 } 109 110 *lineptr = new_lineptr; 111 *n = needed; 112 } 113 114 (*lineptr)[cur_len] = i; 115 cur_len++; 116 117 if (i == delimiter) 118 break; 119 } 120 (*lineptr)[cur_len] = '\0'; 121 result = cur_len ? cur_len : result; 122 123 unlock_return: 124 funlockfile (fp); 125 return result; 126} 127