1 /* 2 * msvcrt.dll math functions 3 * 4 * Copyright 2003 Alexandre Julliard <julliard@winehq.org> 5 * Copyright 2010 Piotr Caban <piotr@codeweavers.com> 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA 20 * 21 */ 22 23 #include <precomp.h> 24 25 /*********************************************************************** 26 * _gcvt (MSVCRT.@) 27 */ 28 char* CDECL _gcvt(double number, int ndigit, char* buff) 29 { 30 if (!buff) { 31 *_errno() = EINVAL; 32 return NULL; 33 } 34 35 if (ndigit < 0) { 36 *_errno() = ERANGE; 37 return NULL; 38 } 39 40 sprintf(buff, "%.*g", ndigit, number); 41 return buff; 42 } 43 44 /*********************************************************************** 45 * _gcvt_s (MSVCRT.@) 46 */ 47 int CDECL _gcvt_s(char* buff, size_t size, double number, int digits) 48 { 49 int len; 50 51 if (!buff) { 52 *_errno() = EINVAL; 53 return EINVAL; 54 } 55 56 if (digits < 0 || digits >= size) { 57 if (size) 58 buff[0] = '\0'; 59 60 *_errno() = ERANGE; 61 return ERANGE; 62 } 63 64 len = _scprintf("%.*g", digits, number); 65 if (len > size) { 66 buff[0] = '\0'; 67 *_errno() = ERANGE; 68 return ERANGE; 69 } 70 71 sprintf(buff, "%.*g", digits, number); 72 return 0; 73 } 74