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kolibrios/programs/develop/tinypy/modules/kolibri/fs.c
jaeger e971a25718 Implemented basic file I/O.
git-svn-id: svn://kolibrios.org@2006 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-07-18 21:43:55 +00:00

259 lines
7.6 KiB
C
Executable File

#include <string.h>
#include "tp.h"
extern tp_obj tp_fnc(TP,tp_obj v(TP));
extern tp_obj tp_method(TP,tp_obj self,tp_obj v(TP));
extern tp_obj tp_number(tp_num v);
extern tp_obj tp_string(char const *v);
extern tp_obj tp_list(TP);
extern tp_obj tp_dict(TP);
extern void _tp_raise(TP,tp_obj);
#define _cdecl __attribute__((cdecl))
extern int (* _cdecl con_printf)(const char* format,...);
#define call70(par, st) asm volatile ("int $0x40":"=a"(st):"a"(70), "b"(par))
#define call70_rw(par, st, cnt) asm volatile ("int $0x40":"=a"(st), "=b"(cnt):"a"(70), "b"(par))
typedef unsigned int uint32_t;
typedef unsigned char uint8_t;
typedef struct {
uint32_t subfnc;
uint32_t res1;
uint32_t res2;
uint32_t res3;
uint8_t *data;
uint8_t res4;
char *fn;
}__attribute__((__packed__)) info_params_t;
typedef struct {
uint32_t subfnc;
uint32_t pos;
uint32_t res1;
uint32_t cnt;
char* data;
uint8_t res2;
char* fn;
} __attribute__((__packed__)) rw_params_t;
static tp_obj kolibri_close(TP)
{
tp_obj self = TP_TYPE(TP_DICT);
uint32_t size = tp_get(tp, self, tp_string("size")).number.val;
char *mode = (char *)tp_get(tp, self, tp_string("mode")).string.val;
tp_set(tp, self, tp_string("closed"), tp_True);
return tp_None;
}
static tp_obj kolibri_read(TP)
{
uint32_t status, num;
tp_obj self = TP_TYPE(TP_DICT);
uint32_t pos = tp_get(tp, self, tp_string("pos")).number.val;
uint32_t size = tp_get(tp, self, tp_string("size")).number.val;
uint32_t cnt;
char *buf = (char *)malloc(size - pos);
rw_params_t params = {0, pos, 0, size - pos, buf, 0,
(char *)tp_get(tp, self, tp_string("name")).string.val};
char *mode = (char *)tp_get(tp, self, tp_string("mode")).string.val;
if (*mode != 'r')
tp_raise(tp_None, "IOError: file not open for reading", tp_None);
if (!buf)
return tp_None;
call70_rw((&params), status, cnt);
buf[cnt] = '\0';
return tp_string(buf);
}
#if 0
static tp_obj kolibri_readline(TP)
{
return tp_string("Line");
}
static tp_obj kolibri_readlines(TP)
{
tp_obj result = tp_list(tp);
int i;
for(i=0; i < 5; i++)
tp_add(result, tp_string("Line"));
return result;
}
#endif
/* Write object to file.
*
* tp TinyPy virtual machine structure.
*
* returns tp_True
*/
static tp_obj kolibri_write(TP)
{
tp_obj self = TP_TYPE(TP_DICT);
tp_obj obj = TP_OBJ(); /* What to write. */
char *mode = (char *)tp_get(tp, self, tp_string("mode")).string.val;
uint32_t pos = (uint32_t)tp_get(tp, self, tp_string("pos")).number.val;
uint32_t size = (uint32_t)tp_get(tp, self, tp_string("size")).number.val;
if (*mode != 'w' && *mode != 'a')
{
tp_raise(tp_None, "IOError: file not open for writing", tp_None);
}
else
{
char *data = (char *)TP_CSTR(obj);
rw_params_t params = {3, pos, 0, strlen(data), data, 0,
(char *)tp_get(tp, self, tp_string("name")).string.val};
uint32_t status;
uint32_t cnt;
call70_rw((&params), status, cnt);
if (status)
{
tp_raise(tp_None, "IOError: writing failed with status %d", status);
}
pos += cnt;
tp_set(tp, self, tp_string("pos"), tp_number(pos));
if (pos > size)
{
/* If writing has come beyond the file, increase its size. */
tp_set(tp, self, tp_string("size"), tp_number(pos));
}
return tp_True;
}
}
/* Write line list into file.
*
* tp TinyPy virtual machine structure.
*
* returns tp_None.
*/
static tp_obj kolibri_writelines(TP)
{
tp_obj result = tp_None;
tp_obj self = TP_TYPE(TP_DICT);
tp_obj list = TP_TYPE(TP_LIST); /* What to write. */
char *mode = (char *)tp_get(tp, self, tp_string("mode")).string.val;
long pos = (long)tp_get(tp, self, tp_string("pos")).number.val;
uint32_t size = (uint32_t)tp_get(tp, self, tp_string("size")).number.val;
if (*mode != 'w' && *mode != 'a')
{
tp_raise(tp_None, "IOError: file not open for writing", tp_None);
}
else
{
int i;
char *fn = (char *)tp_get(tp, self, tp_string("name")).string.val;
rw_params_t params = {3, 0, 0, 0, NULL, 0, fn};
for (i = 0; i < list.list.val->len; i++)
{
char *data = (char *)TP_CSTR(list.list.val->items[i]);
uint32_t status;
uint32_t cnt;
params.data = data;
params.cnt = strlen(data);
params.pos = pos;
call70_rw((&params), status, cnt);
if (status)
tp_raise(tp_None, "IOError: writing failed with status %d", status);
pos += cnt;
}
tp_set(tp, self, tp_string("pos"), tp_number(pos));
if (pos > size)
{
/* If writing has come beyond the file, increase its size. */
tp_set(tp, self, tp_string("size"), tp_number(pos));
}
return tp_True;
}
}
/* Get file size.
*
* fn ASCIIZ absolute file path.
*/
long long int kolibri_filesize(const char *fn)
{
uint8_t data[40];
uint32_t status;
long long int result;
info_params_t params = {5, 0, 0, 0, data, 0, (char *)fn};
call70((&params), status);
/* File size is at offset 32. */
if (status == 0)
result = *(long long*)(&data[32]);
else
result = -status;
return result;
}
/* Open file.
*
* tp TinyPy virtual machine structure.
*
* returns file object.
*/
tp_obj kolibri_open(TP) {
tp_obj obj;
char *fn = (char *)(TP_TYPE(TP_STRING).string.val);
tp_obj mode_obj = TP_OBJ();
long long int size;
long long int pos = 0;
uint32_t status;
info_params_t params = {2, 0, 0, 0, NULL, 0, fn};
if (mode_obj.type == TP_NONE)
mode_obj = tp_string("r");
else if (mode_obj.type != TP_STRING)
tp_raise(tp_None, "ValueError: bad file access mode %s", TP_CSTR(mode_obj));
switch(mode_obj.string.val[0])
{
case 'w':
call70((&params), status);
if (status)
tp_raise(tp_None, "IOError: cannot open file for writing", tp_None);
size = 0;
break;
case 'a':
pos = size;
break;
case 'r':
break;
default:
tp_raise(tp_None, "ValueError: mode string must begin with 'r', 'w', or 'a'", tp_None);
}
if ((size = kolibri_filesize(fn)) < 0)
tp_raise(tp_None, "IOError: filesize returned %d", tp_number(size));
obj = tp_dict(tp);
tp_set(tp, obj, tp_string("name"), tp_string(fn));
tp_set(tp, obj, tp_string("size"), tp_number(size));
tp_set(tp, obj, tp_string("pos"), tp_number(pos));
tp_set(tp, obj, tp_string("mode"), mode_obj);
#if 0
tp_set(tp, obj, tp_string("__doc__"),
tp_string("File object.\nAttributes:\n name: file name\n"
" closed: boolean indicating whether file was closed\n"
"Methods:\n read: read the entire file into string\n"
" readlines: get list of lines\n"
" close: close the file\n"
));
#endif
tp_set(tp, obj, tp_string("closed"), tp_False);
tp_set(tp, obj, tp_string("close"), tp_method(tp, obj, kolibri_close));
tp_set(tp, obj, tp_string("read"), tp_method(tp, obj, kolibri_read));
tp_set(tp, obj, tp_string("write"), tp_method(tp, obj, kolibri_write));
tp_set(tp, obj, tp_string("writelines"), tp_method(tp, obj, kolibri_writelines));
return obj;
}