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/** @file flint_io.cc
* @brief Wrappers for low-level POSIX I/O routines.
*/
/* Copyright (C) 2006,2007 Olly Betts
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "safeerrno.h"
#include "safeunistd.h"
#include <xapian/error.h>
#include "flint_io.h"
size_t flint_io_read(int fd, char * p, size_t n, size_t min)
{
size_t total = 0;
while (n) {
ssize_t c = read(fd, p, n);
if (c <= 0) {
if (c == 0) {
if (total >= min) break;
throw Xapian::DatabaseError("Couldn't read enough (EOF)");
}
if (errno == EINTR) continue;
throw Xapian::DatabaseError("Error reading from file", errno);
}
p += c;
total += c;
n -= c;
}
return total;
}
/** Write n bytes from block pointed to by p to file descriptor fd. */
void flint_io_write(int fd, const char * p, size_t n)
{
while (n) {
int c = write(fd, p, n);
if (c < 0) {
if (errno == EINTR) continue;
throw Xapian::DatabaseError("Error writing to file", errno);
}
p += c;
n -= c;
}
}
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