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Diffstat (limited to 'lib/unistdio/u-vsnprintf.h')
-rw-r--r--lib/unistdio/u-vsnprintf.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/lib/unistdio/u-vsnprintf.h b/lib/unistdio/u-vsnprintf.h
new file mode 100644
index 00000000..481a22f0
--- /dev/null
+++ b/lib/unistdio/u-vsnprintf.h
@@ -0,0 +1,52 @@
+/* Formatted output to strings.
+ Copyright (C) 1999, 2002, 2006-2008 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+int
+VSNPRINTF (DCHAR_T *buf, size_t size, const FCHAR_T *format, va_list args)
+{
+ size_t length;
+ DCHAR_T *result;
+
+ if (size == 0)
+ buf = NULL;
+ else
+ length = size;
+ result = VASNPRINTF (buf, &length, format, args);
+ if (result == NULL)
+ return -1;
+
+ if (result != buf)
+ {
+ if (size != 0)
+ {
+ /* The result did not fit into the buffer. Copy the initial segment
+ into the buffer, truncating it if necessary. */
+ size_t n = (length < size ? length : size - 1);
+ DCHAR_CPY (buf, result, n);
+ buf[n] = '\0';
+ }
+ free (result);
+ }
+
+ if (length > INT_MAX)
+ {
+ errno = EOVERFLOW;
+ return -1;
+ }
+
+ /* Return the number of resulting units, excluding the trailing NUL. */
+ return length;
+}