minix/servers/mfs/utility.c
2012-03-25 21:58:14 +02:00

111 lines
3.4 KiB
C

#include "fs.h"
#include "buf.h"
#include "inode.h"
#include "super.h"
/*===========================================================================*
* no_sys *
*===========================================================================*/
int no_sys()
{
/* Somebody has used an illegal system call number */
printf("no_sys: invalid call %d\n", req_nr);
return(EINVAL);
}
/*===========================================================================*
* conv2 *
*===========================================================================*/
unsigned conv2(norm, w)
int norm; /* TRUE if no swap, FALSE for byte swap */
int w; /* promotion of 16-bit word to be swapped */
{
/* Possibly swap a 16-bit word between 8086 and 68000 byte order. */
if (norm) return( (unsigned) w & 0xFFFF);
return( ((w&BYTE) << 8) | ( (w>>8) & BYTE));
}
/*===========================================================================*
* conv4 *
*===========================================================================*/
long conv4(norm, x)
int norm; /* TRUE if no swap, FALSE for byte swap */
long x; /* 32-bit long to be byte swapped */
{
/* Possibly swap a 32-bit long between 8086 and 68000 byte order. */
unsigned lo, hi;
long l;
if (norm) return(x); /* byte order was already ok */
lo = conv2(FALSE, (int) x & 0xFFFF); /* low-order half, byte swapped */
hi = conv2(FALSE, (int) (x>>16) & 0xFFFF); /* high-order half, swapped */
l = ( (long) lo <<16) | hi;
return(l);
}
/*===========================================================================*
* clock_time *
*===========================================================================*/
time_t clock_time()
{
/* This routine returns the time in seconds since 1.1.1970. MINIX is an
* astrophysically naive system that assumes the earth rotates at a constant
* rate and that such things as leap seconds do not exist.
*/
register int k;
clock_t uptime;
time_t boottime;
if ( (k=getuptime2(&uptime, &boottime)) != OK)
panic("clock_time: getuptme2 failed: %d", k);
return( (time_t) (boottime + (uptime/sys_hz())));
}
/*===========================================================================*
* mfs_min *
*===========================================================================*/
int min(unsigned int l, unsigned int r)
{
if(r >= l) return(l);
return(r);
}
/*===========================================================================*
* mfs_nul *
*===========================================================================*/
void mfs_nul_f(char *file, int line, char *str, unsigned int len,
unsigned int maxlen)
{
if(len < maxlen && str[len-1] != '\0') {
printf("MFS %s:%d string (length %d, maxlen %d) not null-terminated\n",
file, line, len, maxlen);
}
}
#define MYASSERT(c) if(!(c)) { printf("MFS:%s:%d: sanity check: %s failed\n", \
file, line, #c); panic("sanity check " #c " failed: %d", __LINE__); }
/*===========================================================================*
* sanity_check *
*===========================================================================*/
void sanitycheck(char *file, int line)
{
MYASSERT(SELF_E > 0);
if(superblock.s_dev != NO_DEV) {
MYASSERT(superblock.s_dev == fs_dev);
MYASSERT(superblock.s_block_size == fs_block_size);
} else {
MYASSERT(_MIN_BLOCK_SIZE == fs_block_size);
}
}