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66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/* Formatted output to strings.
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Copyright (C) 2004, 2006-2026 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* Specification. */
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#include <stdio.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "vasnprintf.h"
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ptrdiff_t
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szprintf (char *str, const char *format, ...)
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{
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va_list args;
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va_start (args, format);
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/* Set lenbuf = min (SIZE_MAX, - (uintptr_t) str - 1). */
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size_t lenbuf = SIZE_MAX;
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if (lenbuf >= ~ (uintptr_t) str)
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lenbuf = ~ (uintptr_t) str;
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char *output = vasnprintf (str, &lenbuf, format, args);
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size_t len = lenbuf;
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va_end (args);
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if (!output)
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return -1;
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if (output != str)
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{
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/* len is near SIZE_MAX. */
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free (output);
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errno = ENOMEM;
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return -1;
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}
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if (len > PTRDIFF_MAX)
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{
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errno = ENOMEM;
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return -1;
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}
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return len;
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}
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