#ifdef RTAPI
#include "rtapi.h"
#define snprintf rtapi_snprintf
#else
#include "stdio.h"
#endif
 
/* This function can format decimal numbers whose magnitude is less than
   2**31, and when nplaces is less than 9 */
void format_decimal(char *buf, int sz, int nplaces, double value) {
    char *sign = "";
    double frac; 
    int whole, i;
    if(value < 0) { sign = "-"; value = -value; }
    whole = value;
    frac = value - whole;
    for(i=0; i<nplaces; i++) frac *= 10;
    frac += .5;
    
    snprintf(buf, sz, "%s%d.%0*d", sign, whole, nplaces, (int)frac);
}   
 
#ifdef TEST
#include "stdlib.h"
int main(int argc, char **argv) {
    int i;
    for(i=1; i<argc; i++) {
        double v = atof(argv[i]);
        char buf[32];
        format_decimal(buf, 31, 4, v);
        printf("%s\n", buf);
    }   
}   
#endif