1/* Copyright (C) 1993,1997,1998,2000,2001,2002 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#include "libioP.h"
29#include <string.h>
30
31#if defined _LIBC || !_G_HAVE_IO_GETLINE_INFO
32
33_IO_size_t
34_IO_getline (fp, buf, n, delim, extract_delim)
35     _IO_FILE *fp;
36     char *buf;
37     _IO_size_t n;
38     int delim;
39     int extract_delim;
40{
41  return INTUSE(_IO_getline_info) (fp, buf, n, delim, extract_delim,
42				   (int *) 0);
43}
44INTDEF(_IO_getline)
45
46/* Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
47
48   Read chars into buf (of size n), until delim is seen.
49   Return number of chars read (at most n).
50   Does not put a terminating '\0' in buf.
51   If extract_delim < 0, leave delimiter unread.
52   If extract_delim > 0, insert delim in output. */
53
54_IO_size_t
55_IO_getline_info (fp, buf, n, delim, extract_delim, eof)
56     _IO_FILE *fp;
57     char *buf;
58     _IO_size_t n;
59     int delim;
60     int extract_delim;
61     int *eof;
62{
63  char *ptr = buf;
64  if (eof != NULL)
65    *eof = 0;
66  if (__builtin_expect (fp->_mode, -1) == 0)
67    _IO_fwide (fp, -1);
68  while (n != 0)
69    {
70      _IO_ssize_t len = fp->_IO_read_end - fp->_IO_read_ptr;
71      if (len <= 0)
72	{
73	  int c = __uflow (fp);
74	  if (c == EOF)
75	    {
76	      if (eof) *eof = c;
77	      break;
78	    }
79	  if (c == delim)
80	    {
81 	      if (extract_delim > 0)
82		*ptr++ = c;
83	      else if (extract_delim < 0)
84		INTUSE(_IO_sputbackc) (fp, c);
85	      if (extract_delim > 0)
86		++len;
87	      return ptr - buf;
88	    }
89	  *ptr++ = c;
90	  n--;
91	}
92	else
93	  {
94	    char *t;
95	    if ((_IO_size_t) len >= n)
96	      len = n;
97	    t = (char *) memchr ((void *) fp->_IO_read_ptr, delim, len);
98	    if (t != NULL)
99	      {
100		_IO_size_t old_len = ptr-buf;
101		len = t - fp->_IO_read_ptr;
102		if (extract_delim >= 0)
103		  {
104		    ++t;
105		    if (extract_delim > 0)
106		      ++len;
107		  }
108		memcpy ((void *) ptr, (void *) fp->_IO_read_ptr, len);
109		fp->_IO_read_ptr = t;
110		return old_len + len;
111	      }
112	    memcpy ((void *) ptr, (void *) fp->_IO_read_ptr, len);
113	    fp->_IO_read_ptr += len;
114	    ptr += len;
115	    n -= len;
116	  }
117    }
118  return ptr - buf;
119}
120INTDEF(_IO_getline_info)
121
122#endif /* Defined _LIBC || !_G_HAVE_IO_GETLINE_INFO */
123