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/**************************************************************************
MISC Support Routines
**************************************************************************/
#include "etherboot.h"
#include "console.h"
#include <stdlib.h>
/**************************************************************************
IPCHKSUM - Checksum IP Header
**************************************************************************/
uint16_t ipchksum(const void *data, unsigned long length)
{
unsigned long sum;
unsigned long i;
const uint8_t *ptr;
/* In the most straight forward way possible,
* compute an ip style checksum.
*/
sum = 0;
ptr = data;
for(i = 0; i < length; i++) {
unsigned long value;
value = ptr[i];
if (i & 1) {
value <<= 8;
}
/* Add the new value */
sum += value;
/* Wrap around the carry */
if (sum > 0xFFFF) {
sum = (sum + (sum >> 16)) & 0xFFFF;
}
}
return (~cpu_to_le16(sum)) & 0xFFFF;
}
uint16_t add_ipchksums(unsigned long offset, uint16_t sum, uint16_t new)
{
unsigned long checksum;
sum = ~sum & 0xFFFF;
new = ~new & 0xFFFF;
if (offset & 1) {
/* byte swap the sum if it came from an odd offset
* since the computation is endian independant this
* works.
*/
new = bswap_16(new);
}
checksum = sum + new;
if (checksum > 0xFFFF) {
checksum -= 0xFFFF;
}
return (~checksum) & 0xFFFF;
}
/**************************************************************************
RANDOM - compute a random number between 0 and 2147483647L or 2147483562?
**************************************************************************/
long int random(void)
{
static int32_t seed = 0;
int32_t q;
if (!seed) /* Initialize linear congruential generator */
seed = currticks();
/* simplified version of the LCG given in Bruce Schneier's
"Applied Cryptography" */
q = seed/53668;
if ((seed = 40014*(seed-53668*q) - 12211*q) < 0) seed += 2147483563L;
return seed;
}
/**************************************************************************
SLEEP
**************************************************************************/
unsigned int sleep(unsigned int secs)
{
unsigned long tmo;
for (tmo = currticks()+secs*TICKS_PER_SEC; currticks() < tmo; ) {
}
return 0;
}
/**************************************************************************
INTERRUPTIBLE SLEEP
**************************************************************************/
void interruptible_sleep(int secs)
{
printf("<sleep>\n");
sleep(secs);
}
/**************************************************************************
TWIDDLE
**************************************************************************/
void twiddle(void)
{
#ifdef BAR_PROGRESS
static int count=0;
static const char tiddles[]="-\\|/";
static unsigned long lastticks = 0;
unsigned long ticks;
#endif
if ( ! as_main_program ) return;
#ifdef BAR_PROGRESS
/* Limit the maximum rate at which characters are printed */
ticks = currticks();
if ((lastticks + (TICKS_PER_SEC/18)) > ticks)
return;
lastticks = ticks;
putchar(tiddles[(count++)&3]);
putchar('\b');
#else
putchar('.');
#endif /* BAR_PROGRESS */
}
/**************************************************************************
STRCASECMP (not entirely correct, but this will do for our purposes)
**************************************************************************/
int strcasecmp(const char *a, const char *b)
{
while (*a && *b && (*a & ~0x20) == (*b & ~0x20)) {a++; b++; }
return((*a & ~0x20) - (*b & ~0x20));
}
/**************************************************************************
INET_ATON - Convert an ascii x.x.x.x to binary form
**************************************************************************/
int inet_aton ( const char *cp, struct in_addr *inp ) {
const char *p = cp;
const char *digits_start;
unsigned long ip = 0;
unsigned long val;
int j;
for(j = 0; j <= 3; j++) {
digits_start = p;
val = strtoul(p, ( char ** ) &p, 10);
if ((p == digits_start) || (val > 255)) return 0;
if ( ( j < 3 ) && ( *(p++) != '.' ) ) return 0;
ip = (ip << 8) | val;
}
if ( *p == '\0' ) {
inp->s_addr = htonl(ip);
return 1;
}
return 0;
}
int isspace ( int c ) {
switch ( c ) {
case ' ':
case '\f':
case '\n':
case '\r':
case '\t':
case '\v':
return 1;
default:
return 0;
}
}
unsigned long strtoul ( const char *p, char **endp, int base ) {
unsigned long ret = 0;
unsigned int charval;
while ( isspace ( *p ) )
p++;
if ( base == 0 ) {
base = 10;
if ( *p == '0' ) {
p++;
base = 8;
if ( ( *p | 0x20 ) == 'x' ) {
p++;
base = 16;
}
}
}
while ( 1 ) {
charval = *p;
if ( charval >= 'a' ) {
charval = ( charval - 'a' + 10 );
} else if ( charval >= 'A' ) {
charval = ( charval - 'A' + 10 );
} else {
charval = ( charval - '0' );
}
if ( charval >= ( unsigned int ) base )
break;
ret = ( ( ret * base ) + charval );
p++;
}
if ( endp )
*endp = ( char * ) p;
return ( ret );
}
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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