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// SPDX-License-Identifier: Apache-2.0
/*
* Copyright 2019 Joel E. Anderson
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include "private/config/have_vsnprintf_s.h"
#include "private/memory.h"
char *
vsnprintf_s_format_string( const char *format, va_list subs, size_t *length ) {
char *buffer = NULL;
char *new_buffer;
size_t buffer_size = 128;
int result = -1;
do {
new_buffer = realloc_mem( buffer, buffer_size );
if( !new_buffer ) {
goto fail;
}
buffer = new_buffer;
result = vsnprintf_s( buffer, buffer_size, _TRUNCATE, format, subs );
buffer_size = buffer_size << 1;
} while( result < 1 );
*length = result;
return buffer;
fail:
free_mem( buffer );
return NULL;
}