70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/* Formatted output to strings.
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Copyright (C) 2004, 2006-2023 Free Software Foundation, Inc.
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Written by Simon Josefsson and Yoann Vandoorselaere <yoann@prelude-ids.org>.
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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 2.1 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 <limits.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include "vasnprintf.h"
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/* Print formatted output to string STR. Similar to vsprintf, but
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additional length SIZE limit how much is written into STR. Returns
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string length of formatted string (which may be larger than SIZE).
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STR may be NULL, in which case nothing will be written. On error,
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return a negative value. */
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int
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vsnprintf (char *str, size_t size, const char *format, va_list args)
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{
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char *output;
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size_t len;
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size_t lenbuf = size;
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output = vasnprintf (str, &lenbuf, format, args);
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len = lenbuf;
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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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if (size)
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{
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size_t pruned_len = (len < size ? len : size - 1);
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memcpy (str, output, pruned_len);
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str[pruned_len] = '\0';
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}
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free (output);
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}
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if (len > 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 len;
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}
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