1/* Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc. 2 This file is part of the GNU IO Library. 3 4 This library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU General Public License as 6 published by the Free Software Foundation; either version 2, or (at 7 your option) any later version. 8 9 This library is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this library; see the file COPYING. If not, write to 16 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 17 MA 02111-1307, USA. 18 19 As a special exception, if you link this library with files 20 compiled with a GNU compiler to produce an executable, this does 21 not cause the resulting executable to be covered by the GNU General 22 Public License. This exception does not however invalidate any 23 other reasons why the executable file might be covered by the GNU 24 General Public License. */ 25 26#ifdef __STDC__ 27#include <stdlib.h> 28#endif 29#include "libioP.h" 30#include <string.h> 31#include <errno.h> 32 33/* Read up to (and including) a TERMINATOR from FP into *LINEPTR 34 (and null-terminate it). *LINEPTR is a pointer returned from malloc (or 35 NULL), pointing to *N characters of space. It is realloc'ed as 36 necessary. Returns the number of characters read (not including the 37 null terminator), or -1 on error or EOF. */ 38 39_IO_ssize_t 40_IO_getdelim (lineptr, n, delimiter, fp) 41 char **lineptr; 42 _IO_size_t *n; 43 int delimiter; 44 _IO_FILE *fp; 45{ 46 int result; 47 _IO_ssize_t cur_len = 0; 48 _IO_ssize_t len; 49 50 if (lineptr == NULL || n == NULL) 51 { 52 MAYBE_SET_EINVAL; 53 return -1; 54 } 55 CHECK_FILE (fp, -1); 56 _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp); 57 _IO_flockfile (fp); 58 if (_IO_ferror_unlocked (fp)) 59 { 60 result = -1; 61 goto unlock_return; 62 } 63 64 if (*lineptr == NULL || *n == 0) 65 { 66 *n = 120; 67 *lineptr = (char *) malloc (*n); 68 if (*lineptr == NULL) 69 { 70 result = -1; 71 goto unlock_return; 72 } 73 } 74 75 len = fp->_IO_read_end - fp->_IO_read_ptr; 76 if (len <= 0) 77 { 78 if (__underflow (fp) == EOF) 79 { 80 result = -1; 81 goto unlock_return; 82 } 83 len = fp->_IO_read_end - fp->_IO_read_ptr; 84 } 85 86 for (;;) 87 { 88 _IO_size_t needed; 89 char *t; 90 t = (char *) memchr ((void *) fp->_IO_read_ptr, delimiter, len); 91 if (t != NULL) 92 len = (t - fp->_IO_read_ptr) + 1; 93 /* Make enough space for len+1 (for final NUL) bytes. */ 94 needed = cur_len + len + 1; 95 if (needed > *n) 96 { 97 if (needed < 2 * *n) 98 needed = 2 * *n; /* Be generous. */ 99 *n = needed; 100 *lineptr = (char *) realloc (*lineptr, needed); 101 if (*lineptr == NULL) 102 { 103 result = -1; 104 goto unlock_return; 105 } 106 } 107 memcpy (*lineptr + cur_len, (void *) fp->_IO_read_ptr, len); 108 fp->_IO_read_ptr += len; 109 cur_len += len; 110 if (t != NULL || __underflow (fp) == EOF) 111 break; 112 len = fp->_IO_read_end - fp->_IO_read_ptr; 113 } 114 (*lineptr)[cur_len] = '\0'; 115 result = cur_len; 116 117unlock_return: 118 _IO_cleanup_region_end (1); 119 return result; 120} 121 122#ifdef weak_alias 123weak_alias (_IO_getdelim, __getdelim) 124weak_alias (_IO_getdelim, getdelim) 125#endif 126