1 /* Formatted output to strings. 2 Copyright (C) 1999, 2002, 2006-2021 Free Software Foundation, Inc. 3 4 This file is free software. 5 It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+". 6 You can redistribute it and/or modify it under either 7 - the terms of the GNU Lesser General Public License as published 8 by the Free Software Foundation; either version 3, or (at your 9 option) any later version, or 10 - the terms of the GNU General Public License as published by the 11 Free Software Foundation; either version 2, or (at your option) 12 any later version, or 13 - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+". 14 15 This file is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 Lesser General Public License and the GNU General Public License 19 for more details. 20 21 You should have received a copy of the GNU Lesser General Public 22 License and of the GNU General Public License along with this 23 program. If not, see <https://www.gnu.org/licenses/>. */ 24 25 int 26 VSNPRINTF (DCHAR_T *buf, size_t size, const FCHAR_T *format, va_list args) /* */ 27 { 28 size_t length; 29 DCHAR_T *result; 30 31 if (size == 0) 32 buf = NULL; 33 else 34 length = size; 35 result = VASNPRINTF (buf, &length, format, args); 36 if (result == NULL) 37 return -1; 38 39 if (result != buf) 40 { 41 if (size != 0) 42 { 43 /* The result did not fit into the buffer. Copy the initial segment 44 into the buffer, truncating it if necessary. */ 45 size_t n = (length < size ? length : size - 1); 46 DCHAR_CPY (buf, result, n); 47 buf[n] = '\0'; 48 } 49 free (result); 50 } 51 52 if (length > INT_MAX) 53 { 54 errno = EOVERFLOW; 55 return -1; 56 } 57 58 /* Return the number of resulting units, excluding the trailing NUL. */ 59 return length; 60 }