125 lines
2.1 KiB
C
125 lines
2.1 KiB
C
/* $Source$
|
|
* $State$
|
|
* $Revision$
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <cpm.h>
|
|
#include "cpmsys.h"
|
|
|
|
void _sys_write_tty(char c)
|
|
{
|
|
if (c == '\n')
|
|
cpm_conout('\r');
|
|
cpm_conout(c);
|
|
}
|
|
|
|
ssize_t write(int fd, void* buffer, size_t count)
|
|
{
|
|
const uint8_t* bbuffer = buffer;
|
|
struct FCBE* fcbe = &__fd[fd];
|
|
uint8_t olduser;
|
|
uint16_t result;
|
|
uint8_t* dest;
|
|
|
|
__init_file_descriptors();
|
|
if (fcbe->fcb.dr == 0)
|
|
{
|
|
/* Write to the console. */
|
|
|
|
size_t i = count;
|
|
while (i--)
|
|
_sys_write_tty(*bbuffer++);
|
|
return count;
|
|
}
|
|
|
|
olduser = cpm_get_user();
|
|
cpm_set_user(fcbe->user);
|
|
|
|
if (fcbe->offset || !SECTOR_ALIGNED(count))
|
|
{
|
|
/* We're not at a sector boundary, so we need to do a
|
|
* read/modify/write of the initial fragment. */
|
|
|
|
cpm_set_dma(__transfer_buffer);
|
|
if (cpm_read_random_safe(&fcbe->fcb) != 0)
|
|
goto eio;
|
|
|
|
/* Copy enough bytes to reach the end of the sector. */
|
|
|
|
dest = __transfer_buffer + fcbe->offset;
|
|
while ((count != 0) && (fcbe->offset != 128))
|
|
{
|
|
*dest++ = *bbuffer++;
|
|
fcbe->offset++;
|
|
count--;
|
|
}
|
|
|
|
/* Write back. */
|
|
|
|
if (cpm_write_random(&fcbe->fcb) != 0)
|
|
goto eio;
|
|
|
|
/* If we've written enough bytes, advance to the next sector. */
|
|
|
|
if (fcbe->offset == 128)
|
|
{
|
|
U16(fcbe->fcb.r)++;
|
|
fcbe->offset = 0;
|
|
}
|
|
}
|
|
|
|
while (count >= 128)
|
|
{
|
|
/* Write entire sectors directly from the source buffer. */
|
|
|
|
cpm_set_dma(bbuffer);
|
|
if (cpm_write_random(&fcbe->fcb) != 0)
|
|
goto eio;
|
|
count -= 128;
|
|
bbuffer += 128;
|
|
U16(fcbe->fcb.r)++;
|
|
}
|
|
|
|
if (count != 0)
|
|
{
|
|
/* There's some trailing data to write. We need another
|
|
* read/modify/write cycle. */
|
|
|
|
cpm_set_dma(__transfer_buffer);
|
|
if (cpm_read_random_safe(&fcbe->fcb) != 0)
|
|
goto eio;
|
|
|
|
dest = __transfer_buffer;
|
|
while (count != 0)
|
|
{
|
|
*dest++ = *bbuffer++;
|
|
count--;
|
|
}
|
|
|
|
if (cpm_write_random(&fcbe->fcb) != 0)
|
|
goto eio;
|
|
|
|
fcbe->offset = count;
|
|
}
|
|
|
|
if (U16(fcbe->fcb.r) >= fcbe->length)
|
|
{
|
|
fcbe->length = U16(fcbe->fcb.r);
|
|
if (fcbe->offset != 0)
|
|
fcbe->length++;
|
|
}
|
|
|
|
result = bbuffer - (uint8_t*)buffer;
|
|
exit:
|
|
cpm_set_user(olduser);
|
|
return result;
|
|
|
|
eio:
|
|
errno = EIO;
|
|
result = -1;
|
|
goto exit;
|
|
}
|