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/*
* Copyright 2026 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdarg.h>
#include <stdio.h>
#include <openssl/crypto.h>
#include "internal/cryptlib.h"
int ossl_vasprintf(char **str, const char *format, va_list args)
{
char *candidate = NULL;
size_t candidate_len = 64;
size_t tmp_len = 0;
char *tmp = NULL;
int ret;
if ((candidate = OPENSSL_malloc(candidate_len)) == NULL)
goto err;
va_list args_copy;
va_copy(args_copy, args);
ret = vsnprintf(candidate, candidate_len, format, args_copy);
va_end(args_copy);
if (ret < 0)
goto err;
if ((size_t)ret >= candidate_len) {
/* Too big to fit in allocation. */
tmp_len = (size_t)ret + 1;
if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
goto err;
OPENSSL_clear_free(candidate, candidate_len);
candidate = tmp;
candidate_len = tmp_len;
tmp = NULL;
ret = vsnprintf(candidate, candidate_len, format, args);
}
/* At this point this should not happen unless vsnprintf is insane. */
if (ret < 0 || (size_t)ret >= candidate_len)
goto err;
*str = candidate;
return ret;
err:
OPENSSL_clear_free(candidate, candidate_len);
OPENSSL_clear_free(tmp, tmp_len);
*str = NULL;
return -1;
}
int ossl_asprintf(char **str, const char *format, ...)
{
va_list args;
int ret;
va_start(args, format);
ret = ossl_vasprintf(str, format, args);
va_end(args);
return ret;
}
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