1 /* getdelim.c --- Implementation of replacement getdelim function. 2 Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005 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 #ifdef HAVE_CONFIG_H 23 # include <config.h> 24 #endif 25 26 #include <stdlib.h> 27 #include <errno.h> 28 29 #include "getdelim.h" 30 31 #if !HAVE_FLOCKFILE 32 # undef flockfile 33 # define flockfile(x) ((void) 0) 34 #endif 35 #if !HAVE_FUNLOCKFILE 36 # undef funlockfile 37 # define funlockfile(x) ((void) 0) 38 #endif 39 40 /* Read up to (and including) a DELIMITER from FP into *LINEPTR (and 41 NUL-terminate it). *LINEPTR is a pointer returned from malloc (or 42 NULL), pointing to *N characters of space. It is realloc'ed as 43 necessary. Returns the number of characters read (not including 44 the null terminator), or -1 on error or EOF. */ 45 46 ssize_t 47 getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp) 48 { 49 int result = 0; 50 ssize_t cur_len = 0; 51 ssize_t len; 52 53 if (lineptr == NULL || n == NULL || fp == NULL) 54 { 55 errno = EINVAL; 56 return -1; 57 } 58 59 flockfile (fp); 60 61 if (*lineptr == NULL || *n == 0) 62 { 63 *n = 120; 64 *lineptr = (char *) malloc (*n); 65 if (*lineptr == NULL) 66 { 67 result = -1; 68 goto unlock_return; 69 } 70 } 71 72 for (;;) 73 { 74 char *t; 75 int i; 76 77 i = getc (fp); 78 if (i == EOF) 79 { 80 result = -1; 81 break; 82 } 83 84 /* Make enough space for len+1 (for final NUL) bytes. */ 85 if (cur_len + 1 >= *n) 86 { 87 size_t needed = 2 * (cur_len + 1) + 1; /* Be generous. */ 88 char *new_lineptr; 89 90 if (needed < cur_len) 91 { 92 result = -1; 93 goto unlock_return; 94 } 95 96 new_lineptr = (char *) realloc (*lineptr, needed); 97 if (new_lineptr == NULL) 98 { 99 result = -1; 100 goto unlock_return; 101 } 102 103 *lineptr = new_lineptr; 104 *n = needed; 105 } 106 107 (*lineptr)[cur_len] = i; 108 cur_len++; 109 110 if (i == delimiter) 111 break; 112 } 113 (*lineptr)[cur_len] = '\0'; 114 result = cur_len ? cur_len : result; 115 116 unlock_return: 117 funlockfile (fp); 118 return result; 119 } 120