src/stdlib/ecvt.c

   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 }