bdberl/c_src/bin_helper.c
Jon Meredith 1409096860 Renamed get_lg_dir() to get_lg_dir_info and added get_data_dirs_info().
Both new calls return the filesystem id and the number of mbytes available
on that filesystem.
2009-05-29 12:13:19 -06:00

55 lines
1.3 KiB
C

/* -------------------------------------------------------------------
*
* bin_helper: ErlDrvBinary helper functions
* Copyright (c) 2008 The Hive. All rights reserved.
*
* ------------------------------------------------------------------- */
#include "bin_helper.h"
#include <string.h>
#include <stdlib.h>
static void bin_helper_check_size(BinHelper* bh, int space_needed)
{
if (bh->bin && (bh->offset + space_needed > bh->bin->orig_size))
{
bh->bin = driver_realloc_binary(bh->bin, bh->offset + space_needed);
}
else if (!bh->bin)
{
bh->bin = driver_alloc_binary(space_needed);
}
}
void bin_helper_init(BinHelper* bh)
{
bh->bin = 0;
bh->offset = 0;
}
void bin_helper_push_byte(BinHelper* bh, int value)
{
bin_helper_check_size(bh, 1);
bh->bin->orig_bytes[bh->offset] = (char)value;
bh->offset++;
}
void bin_helper_push_int32(BinHelper* bh, int value)
{
bin_helper_check_size(bh, 4);
memcpy(bh->bin->orig_bytes+(bh->offset), (char*)&value, 4);
bh->offset += 4;
}
void bin_helper_push_string(BinHelper* bh, const char* string)
{
if (NULL == string)
{
string = "<null>";
}
int sz = strlen(string);
bin_helper_check_size(bh, sz+1);
strncpy(bh->bin->orig_bytes+(bh->offset), string, sz+1);
bh->offset += sz + 1;
}