minix/servers/mfs/utility.c

119 lines
3.6 KiB
C

#include "fs.h"
#include <sys/stat.h>
#include <string.h>
#include <minix/com.h>
#include <minix/callnr.h>
#include "buf.h"
#include "inode.h"
#include "super.h"
#include <minix/vfsif.h>
static int panicking;
/*===========================================================================*
* no_sys *
*===========================================================================*/
PUBLIC int no_sys()
{
/* Somebody has used an illegal system call number */
return(EINVAL);
}
/*===========================================================================*
* panic *
*===========================================================================*/
PUBLIC void panic(who, mess, num)
char *who; /* who caused the panic */
char *mess; /* panic message string */
int num; /* number to go with it */
{
/* Something awful has happened. Panics are caused when an internal
* inconsistency is detected, e.g., a programming error or illegal value of a
* defined constant.
*/
if (panicking) return; /* do not panic during a sync */
panicking = TRUE; /* prevent another panic during the sync */
printf("FS panic (%s): %s ", who, mess);
if (num != NO_NUM) printf("%d",num);
(void) fs_sync(); /* flush everything to the disk */
sys_exit(SELF);
}
/*===========================================================================*
* conv2 *
*===========================================================================*/
PUBLIC 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 *
*===========================================================================*/
PUBLIC 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 *
*===========================================================================*/
PUBLIC 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;
if ( (k=getuptime(&uptime)) != OK) panic(__FILE__,"clock_time err", k);
return( (time_t) (boottime + (uptime/HZ)));
}
int mfs_min_f(char *file, int line, int v1, int v2)
{
if(v1 < 0 || v2 < 0) {
printf("mfs:%s:%d: strange string lengths: %d, %d\n",
file, line, v1, v2);
panic(file, "strange string lengths", NO_NUM);
}
if(v2 >= v1) return v1;
#if 0
printf("mfs:%s:%d: truncated %d to %d\n",
file, line, v1, v2);
#endif
return v2;
}
void mfs_nul_f(char *file, int line, char *str, int len, int maxlen)
{
if(len < 1) {
printf("mfs:%s:%d: %d-length string?!\n", file, line, len);
panic(file, "strange string length", NO_NUM);
}
if(len < maxlen && str[len-1] != '\0') {
printf("mfs:%s:%d: string (length %d, maxlen %d) "
"not null-terminated\n",
file, line, len, maxlen);
}
}