67 lines
2.3 KiB
C
Executable File
67 lines
2.3 KiB
C
Executable File
/* Formatted output to strings.
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Copyright (C) 1999, 2002, 2006-2024 Free Software Foundation, Inc.
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This file is free software.
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It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
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You can redistribute it and/or modify it under either
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- the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3, or (at your
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option) any later version, or
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- the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version, or
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- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License and the GNU General Public License
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for more details.
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You should have received a copy of the GNU Lesser General Public
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License and of the GNU General Public License along with this
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program. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef SIZE_MAX
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# define SIZE_MAX ((size_t) -1)
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#endif
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int
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VSPRINTF (DCHAR_T *buf, const FCHAR_T *format, va_list args)
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{
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/* Pass an infinite length. But note that *vasnprintf may fail if the buffer
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argument is larger than INT_MAX (if that fits into a 'size_t' at all).
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Also note that glibc's iconv fails with E2BIG when we pass a length that
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is so large that buf + length wraps around, i.e.
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(uintptr_t) (buf + length) < (uintptr_t) buf. */
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size_t length;
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DCHAR_T *result;
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/* Set length = min (SIZE_MAX, INT_MAX, - (uintptr_t) buf - 1). */
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length = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX);
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if (length > (~ (uintptr_t) buf) / sizeof (DCHAR_T))
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length = (~ (uintptr_t) buf) / sizeof (DCHAR_T);
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result = VASNPRINTF (buf, &length, format, args);
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if (result == NULL)
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return -1;
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/* The infinite buffer size guarantees that the result is not malloc()ed. */
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if (result != buf)
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{
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/* length is near SIZE_MAX. */
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free (result);
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errno = EOVERFLOW;
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return -1;
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}
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if (length > INT_MAX)
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{
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errno = EOVERFLOW;
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return -1;
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}
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/* Return the number of resulting units, excluding the trailing NUL. */
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return length;
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}
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