blob: 8e002b41e7b8599ccbf3904b50f293f28b49d7fa (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
// Copyright (C) 2016 Bruce Guenter <bruce@untroubled.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "fdbuf.h"
#include <errno.h>
#include <unistd.h>
bool fdobuf::seek(unsigned o)
{
if(flags)
return false;
lock();
unsigned buf_start = offset;
unsigned buf_end = offset + buflength;
if(o >= buf_start && o < buf_end) {
bufpos = o - buf_start;
}
else {
if(!nflush(false)) {
unlock();
return false;
}
if(lseek(fd, o, SEEK_SET) != (off_t)o) {
errnum = errno;
flags |= flag_error;
unlock();
return false;
}
offset = o;
}
count = 0;
unlock();
return true;
}
|
