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#include <stdio.h>
#include <string.h>
#include <slang.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#ifndef MAP_FAILED
# define MAP_FAILED -1
#endif
SLANG_MODULE(varray);
typedef struct
{
unsigned long size_mmapped;
VOID_STAR addr;
VOID_STAR data;
}
MMap_Type;
static void free_mmap_type (MMap_Type *m)
{
if (m == NULL)
return;
if (m->addr != NULL)
(void) munmap ((char *) m->addr, m->size_mmapped);
SLfree ((char *)m);
}
static void unmmap_array (SLang_Array_Type *at)
{
if (at->client_data != NULL)
free_mmap_type ((MMap_Type *) at->client_data);
at->data = NULL;
at->client_data = NULL;
}
static MMap_Type *mmap_file (char *file, unsigned int offset,
unsigned long num_bytes)
{
FILE *fp;
int fd;
struct stat st;
VOID_STAR addr;
MMap_Type *m;
fp = fopen (file, "rb");
if (fp == NULL)
{
SLang_verror (SL_OBJ_NOPEN, "mmap_array: unable to open %s for reading", file);
return NULL;
}
fd = fileno (fp);
if (-1 == fstat (fd, &st))
{
SLang_verror (SL_INTRINSIC_ERROR, "mmap_array: stat %s failed", file);
fclose (fp);
return NULL;
}
if (NULL == (m = (MMap_Type *) SLmalloc (sizeof (MMap_Type))))
{
fclose (fp);
return NULL;
}
m->size_mmapped = num_bytes + offset;
addr = (VOID_STAR)mmap (NULL, m->size_mmapped, PROT_READ, MAP_SHARED, fd, 0);
if (addr == (VOID_STAR)MAP_FAILED)
{
SLang_verror (SL_INTRINSIC_ERROR, "mmap_array: mmap %s failed", file);
SLfree ((char *) m);
fclose (fp);
return NULL;
}
m->addr = addr;
m->data = (VOID_STAR) ((char *)addr + offset);
fclose (fp);
return m;
}
/* usage:
* a = mmap_array (file, offset, type, [dims]);
*/
static void mmap_array (void)
{
SLang_Array_Type *a, *a_dims;
char *file;
unsigned char type;
int *dims;
unsigned int num_dims;
unsigned int i;
unsigned int num_elements;
unsigned int offset;
unsigned int sizeof_type;
unsigned long num_bytes;
MMap_Type *m;
VOID_STAR data;
a_dims = NULL;
file = NULL;
data = NULL;
if (-1 == SLang_pop_array_of_type (&a_dims, SLANG_INT_TYPE))
return;
num_dims = a_dims->num_elements;
dims = (int *)a_dims->data;
if (-1 == SLang_pop_datatype (&type))
goto return_error;
switch (type)
{
case SLANG_CHAR_TYPE:
case SLANG_UCHAR_TYPE:
sizeof_type = 1;
break;
case SLANG_SHORT_TYPE:
case SLANG_USHORT_TYPE:
sizeof_type = sizeof(short);
break;
case SLANG_INT_TYPE:
case SLANG_UINT_TYPE:
sizeof_type = sizeof (int);
break;
case SLANG_LONG_TYPE:
case SLANG_ULONG_TYPE:
sizeof_type = sizeof (long);
break;
case SLANG_FLOAT_TYPE:
sizeof_type = sizeof (float);
break;
case SLANG_DOUBLE_TYPE:
sizeof_type = sizeof (double);
break;
case SLANG_COMPLEX_TYPE:
sizeof_type = 2 * sizeof (double);
break;
default:
SLang_verror (SL_NOT_IMPLEMENTED, "mmap_array: unsupported data type");
goto return_error;
}
num_elements = 1;
for (i = 0; i < num_dims; i++)
{
if (dims[i] < 0)
{
SLang_verror (SL_USER_ERROR, "mmap_array: dims array must be positive");
goto return_error;
}
num_elements *= dims[i];
}
if (num_dims == 0)
num_elements = 0;
num_bytes = (unsigned long) sizeof_type * (unsigned long) num_elements;
if (-1 == SLang_pop_uinteger (&offset))
goto return_error;
if (-1 == SLang_pop_slstring (&file))
goto return_error;
if (NULL == (m = mmap_file (file, offset, num_bytes)))
goto return_error;
if (NULL == (a = SLang_create_array (type, 1, m->data, dims, num_dims)))
goto return_error;
a->free_fun = unmmap_array;
a->client_data = (VOID_STAR) m;
m = NULL; /* done with this */
(void) SLang_push_array (a, 1);
/* drop */
return_error:
if (m != NULL)
free_mmap_type (m);
if (a_dims != NULL)
SLang_free_array (a_dims);
if (file != NULL)
SLang_free_slstring (file);
}
static SLang_Intrin_Fun_Type Module_Intrinsics [] =
{
MAKE_INTRINSIC_0("mmap_array", mmap_array, SLANG_VOID_TYPE),
SLANG_END_INTRIN_FUN_TABLE
};
int init_varray_module_ns (char *ns_name)
{
SLang_NameSpace_Type *ns;
if (NULL == (ns = SLns_create_namespace (ns_name)))
return -1;
if (-1 == SLns_add_intrin_fun_table (ns, Module_Intrinsics, NULL))
return -1;
return 0;
}
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