ecvt.c raw

   1  #define _GNU_SOURCE
   2  #include <stdlib.h>
   3  #include <stdio.h>
   4  
   5  char *ecvt(double x, int n, int *dp, int *sign)
   6  {
   7  	static char buf[16];
   8  	char tmp[32];
   9  	int i, j;
  10  
  11  	if (n-1U > 15) n = 15;
  12  	sprintf(tmp, "%.*e", n-1, x);
  13  	i = *sign = (tmp[0]=='-');
  14  	for (j=0; tmp[i]!='e'; j+=(tmp[i++]!='.'))
  15  		buf[j] = tmp[i];
  16  	buf[j] = 0;
  17  	*dp = atoi(tmp+i+1)+1;
  18  
  19  	return buf;
  20  }
  21