1/* Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, write to the Free
16   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17   02111-1307 USA.
18
19   As a special exception, if you link the code in this file with
20   files compiled with a GNU compiler to produce an executable,
21   that does not cause the resulting executable to be covered by
22   the GNU Lesser General Public License.  This exception does not
23   however invalidate any other reasons why the executable file
24   might be covered by the GNU Lesser General Public License.
25   This exception applies to code released by its copyright holders
26   in files containing the exception.
27*/
28
29#include "libioP.h"
30#include <stdlib.h>
31#include <string.h>
32#include <errno.h>
33
34/* Read up to (and including) a TERMINATOR from FP into *LINEPTR
35   (and null-terminate it).  *LINEPTR is a pointer returned from malloc (or
36   NULL), pointing to *N characters of space.  It is realloc'ed as
37   necessary.  Returns the number of characters read (not including the
38   null terminator), or -1 on error or EOF.  */
39
40_IO_ssize_t
41_IO_getdelim(char **lineptr, _IO_size_t *n, int delimiter, _IO_FILE *fp)
42{
43  int result;
44  _IO_ssize_t cur_len = 0;
45  _IO_ssize_t len;
46
47  if (lineptr == NULL || n == NULL)
48    {
49      MAYBE_SET_EINVAL;
50      return -1;
51    }
52  CHECK_FILE (fp, -1);
53  _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
54  _IO_flockfile (fp);
55  if (_IO_ferror_unlocked (fp))
56    {
57      result = -1;
58      goto unlock_return;
59    }
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  len = fp->_IO_read_end - fp->_IO_read_ptr;
73  if (len <= 0)
74    {
75      if (__underflow (fp) == EOF)
76	{
77	  result = -1;
78	  goto unlock_return;
79	}
80      len = fp->_IO_read_end - fp->_IO_read_ptr;
81    }
82
83  for (;;)
84    {
85      _IO_size_t needed;
86      char *t;
87      t = (char *) memchr ((void *) fp->_IO_read_ptr, delimiter, len);
88      if (t != NULL)
89	len = (t - fp->_IO_read_ptr) + 1;
90      /* Make enough space for len+1 (for final NUL) bytes.  */
91      needed = cur_len + len + 1;
92      if (needed > *n)
93	{
94	  char *new_lineptr;
95
96	  if (needed < 2 * *n)
97	    needed = 2 * *n;  /* Be generous. */
98	  new_lineptr = (char *) realloc (*lineptr, needed);
99	  if (new_lineptr == NULL)
100	    {
101	      result = -1;
102	      goto unlock_return;
103	    }
104	  *lineptr = new_lineptr;
105	  *n = needed;
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_funlockfile (fp);
119  _IO_cleanup_region_end (0);
120  return result;
121}
122
123#ifdef weak_alias
124weak_alias (_IO_getdelim, __getdelim)
125weak_alias (_IO_getdelim, getdelim)
126#endif
127