| 1 | #define _GNU_SOURCE |
| 2 | #include <stdlib.h> |
| 3 | #include <stdio.h> |
| 4 | #include <string.h> |
| 5 | |
| 6 | char *fcvt(double x, int n, int *dp, int *sign) |
| 7 | { |
| 8 | char tmp[1500]; |
| 9 | int i, lz; |
| 10 | |
| 11 | if (n > 1400U) n = 1400; |
| 12 | sprintf(tmp, "%.*f", n, x); |
| 13 | i = (tmp[0] == '-'); |
| 14 | if (tmp[i] == '0') lz = strspn(tmp+i+2, "0"); |
| 15 | else lz = -(int)strcspn(tmp+i, "."); |
| 16 | |
| 17 | if (n<=lz) { |
| 18 | *sign = i; |
| 19 | *dp = 1; |
| 20 | if (n>14U) n = 14; |
| 21 | return "000000000000000"+14-n; |
| 22 | } |
| 23 | |
| 24 | return ecvt(x, n-lz, dp, sign); |
| 25 | } |