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/*
* Utility functions.
*/
#include <stdio.h>
#include "verse_header.h"
#include "v_network.h"
#include "v_util.h"
/* Safe string copy. Copies from <src> to <dst>, not using more than <size>
* bytes of destination space. Always 0-terminates the destination. Returns
* the beginning of the destination string.
*/
char * v_strlcpy(char *dst, const char *src, size_t size)
{
char *base = dst;
if(size == 0)
return NULL;
for(size--; size > 0 && *src != '\0'; size--)
*dst++ = *src++;
*dst = '\0';
return base;
}
void v_timer_start(VUtilTimer *timer)
{
v_n_get_current_time(&timer->seconds, &timer->fractions);
}
void v_timer_advance(VUtilTimer *timer, double seconds)
{
if(timer == NULL)
return;
timer->seconds += (uint32) seconds;
timer->fractions += (uint32) ((seconds - (int) seconds) * (double) 0xffffffff);
}
double v_timer_elapsed(const VUtilTimer *timer)
{
uint32 cur_seconds, cur_fractions;
v_n_get_current_time(&cur_seconds, &cur_fractions);
return (double)(cur_seconds - timer->seconds) + ((double)cur_fractions - (double)timer->fractions) / (double) 0xffffffff;
}
void v_timer_print(const VUtilTimer *timer)
{
uint32 cur_seconds, cur_fractions;
v_n_get_current_time(&cur_seconds, &cur_fractions);
printf("%f", (double)(cur_seconds - timer->seconds) + ((double)cur_fractions - (double)timer->fractions) / (double) 0xffffffff);
}
/* Compare |x| against built-in semi-magical constant, and return 1 if it's larger, 0 if not. */
static int quat_valid(real64 x)
{
const real64 EPSILON = 0.0000001;
return x > 0.0 ? x > EPSILON : x < -EPSILON;
}
int v_quat32_valid(const VNQuat32 *q)
{
if(q == NULL)
return 0;
return quat_valid(q->x) && quat_valid(q->y) && quat_valid(q->z) && quat_valid(q->w);
}
int v_quat64_valid(const VNQuat64 *q)
{
if(q == NULL)
return 0;
return quat_valid(q->x) && quat_valid(q->y) && quat_valid(q->z) && quat_valid(q->w);
}
VNQuat32 * v_quat32_from_quat64(VNQuat32 *dst, const VNQuat64 *src)
{
if(dst == NULL || src == NULL)
return NULL;
dst->x = (real32) src->x;
dst->y = (real32) src->y;
dst->z = (real32) src->z;
dst->w = (real32) src->w;
return dst;
}
VNQuat64 * v_quat64_from_quat32(VNQuat64 *dst, const VNQuat32 *src)
{
if(dst == NULL || src == NULL)
return NULL;
dst->x = src->x;
dst->y = src->y;
dst->z = src->z;
dst->w = src->w;
return dst;
}
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