transmission/libtransmission/file.c

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2014-09-21 18:08:56 +00:00
/*
* This file Copyright (C) 2013-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
* $Id$
*/
#include <assert.h>
#include <string.h> /* strlen () */
#include "transmission.h"
#include "file.h"
#include "utils.h"
bool
tr_sys_file_read_line (tr_sys_file_t handle,
char * buffer,
size_t buffer_size,
tr_error ** error)
{
bool ret = false;
size_t offset = 0;
uint64_t bytes_read;
assert (handle != TR_BAD_SYS_FILE);
assert (buffer != NULL);
assert (buffer_size > 0);
while (buffer_size > 0)
{
size_t i;
bool found_eol = false;
ret = tr_sys_file_read (handle, buffer + offset, MIN(buffer_size, 1024u),
&bytes_read, error);
if (!ret || (offset == 0 && bytes_read == 0))
{
ret = false;
break;
}
for (i = 0; i < bytes_read; ++i, ++offset, --buffer_size)
{
if (buffer[offset] == '\n')
{
found_eol = true;
break;
}
}
if (found_eol || buffer_size == 0 || bytes_read == 0)
{
const int64_t delta = -(int64_t) bytes_read + i + (found_eol ? 1 : 0);
if (delta != 0)
{
ret = tr_sys_file_seek (handle, delta, TR_SEEK_CUR, NULL, error);
if (!ret)
break;
}
if (offset > 0 && buffer[offset - 1] == '\r')
buffer[offset - 1] = '\0';
else
buffer[offset] = '\0';
break;
}
}
return ret;
}
bool
tr_sys_file_write_line (tr_sys_file_t handle,
const char * buffer,
tr_error ** error)
{
bool ret;
assert (handle != TR_BAD_SYS_FILE);
assert (buffer != NULL);
ret = tr_sys_file_write (handle, buffer, strlen (buffer), NULL, error);
if (ret)
ret = tr_sys_file_write (handle, TR_NATIVE_EOL_STR, TR_NATIVE_EOL_STR_SIZE,
NULL, error);
return ret;
}
bool
tr_sys_file_write_fmt (tr_sys_file_t handle,
const char * format,
tr_error ** error,
...)
{
bool ret = false;
char * buffer;
va_list args;
assert (handle != TR_BAD_SYS_FILE);
assert (format != NULL);
va_start (args, error);
buffer = tr_strdup_vprintf (format, args);
va_end (args);
if (buffer != NULL)
{
ret = tr_sys_file_write (handle, buffer, strlen (buffer), NULL, error);
tr_free (buffer);
}
else
{
tr_error_set_literal (error, 0, "Unable to format message.");
}
return ret;
}