1/* This is part of libio/iostream, providing -*- C++ -*- input/output.
2Copyright (C) 1993 Free Software Foundation
3
4This file is part of the GNU IO Library.  This library is free
5software; you can redistribute it and/or modify it under the
6terms of the GNU General Public License as published by the
7Free Software Foundation; either version 2, or (at your option)
8any later version.
9
10This library is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this library; see the file COPYING.  If not, write to the Free
17Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18
19As a special exception, if you link this library with files
20compiled with a GNU compiler to produce an executable, this does not cause
21the resulting executable to be covered by the GNU General Public License.
22This exception does not however invalidate any other reasons why
23the executable file might be covered by the GNU General Public License. */
24
25#include <libioP.h>
26#include "iostream.h"
27#include <string.h>
28
29istream& istream::getline(char* buf, int len, char delim)
30{
31  _gcount = 0;
32  if (len <= 0)
33    {
34      set(ios::failbit);
35      return *this;
36    }
37  int ch;
38  if (ipfx1())
39    {
40      _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile,
41				_strbuf);
42      streambuf *sb = rdbuf();
43      _gcount = _IO_getline_info(sb, buf, len - 1, delim, -1, &ch);
44      if (ch != EOF)
45	ch = sb->sbumpc();
46      if (ch == EOF)
47	set (_gcount == 0 ? (ios::failbit|ios::eofbit) : ios::eofbit);
48      else if (ch != (unsigned char) delim)
49	{
50	  set(ios::failbit);
51	  sb->sungetc(); // Leave delimiter unread.
52	}
53      isfx();
54      _IO_cleanup_region_end (0);
55    }
56  else
57    ch = EOF;
58  buf[_gcount] = '\0';
59  if (ch == (unsigned char)delim)
60    _gcount++; // The delimiter is counted in the gcount().
61  return *this;
62}
63
64istream& istream::get(char* buf, int len, char delim)
65{
66  _gcount = 0;
67  if (len <= 0)
68    {
69      set(ios::failbit);
70      return *this;
71    }
72  if (ipfx1())
73    {
74      _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile,
75				_strbuf);
76      streambuf *sbuf = rdbuf();
77      int ch;
78      _gcount = _IO_getline_info(sbuf, buf, len - 1, delim, -1, &ch);
79      if (_gcount == 0 && ch == EOF)
80	set(ios::failbit|ios::eofbit);
81      isfx();
82      _IO_cleanup_region_end (0);
83    }
84  buf[_gcount] = '\0';
85  return *this;
86}
87
88
89// from Doug Schmidt
90
91#define CHUNK_SIZE 512
92
93/* Reads an arbitrarily long input line terminated by a user-specified
94   TERMINATOR.  Super-nifty trick using recursion avoids unnecessary calls
95   to NEW! */
96
97char *_sb_readline (streambuf *sb, long& total, char terminator)
98{
99    char buf[CHUNK_SIZE];
100    char *ptr;
101    int ch;
102
103    _IO_size_t count = _IO_getline_info(sb, buf, CHUNK_SIZE, terminator,
104				       -1, &ch);
105    if (ch != EOF)
106      ch = sb->sbumpc();
107    long old_total = total;
108    total += count;
109    if (ch != EOF && ch != terminator) {
110	total++; // Include ch in total.
111	ptr = _sb_readline(sb, total, terminator);
112	if (ptr) {
113	    memcpy(ptr + old_total, buf, count);
114	    ptr[old_total+count] = ch;
115	}
116	return ptr;
117    }
118
119    ptr = new char[total+1];
120    if (ptr != NULL) {
121	ptr[total] = '\0';
122	memcpy(ptr + total - count, buf, count);
123    }
124    return ptr;
125}
126
127/* Reads an arbitrarily long input line terminated by TERMINATOR.
128   This routine allocates its own memory, so the user should
129   only supply the address of a (char *). */
130
131istream& istream::gets(char **s, char delim /* = '\n' */)
132{
133    if (ipfx1()) {
134	_IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile,
135				  _strbuf);
136	long size = 0;
137	streambuf *sb = rdbuf();
138	*s = _sb_readline (sb, size, delim);
139	_gcount = *s ? size : 0;
140	if (sb->_flags & _IO_EOF_SEEN) {
141	    set(ios::eofbit);
142	    if (_gcount == 0)
143		set(ios::failbit);
144	}
145	isfx();
146	_IO_cleanup_region_end (0);
147    }
148    else {
149	_gcount = 0;
150	*s = NULL;
151    }
152    return *this;
153}
154