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