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/* librist. Copyright © 2019 SipRadius LLC. All right reserved.
* Author: Sergio Ammirata, Ph.D. <sergio@ammirata.net>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "stdio-shim.h"
#include <stdlib.h>
#include <limits.h>
#ifdef _MSC_VER
int vasprintf(char** strp, const char* fmt, va_list ap)
{
#ifdef _WIN32
int size = _vscprintf(fmt, ap);
#else
// https://stackoverflow.com/a/4785411
va_list apcopy;
va_copy(apcopy, ap);
int size = vsnprintf(NULL, 0, fmt, apcopy);
va_end(apcopy);
#endif
if ((size < 0) || (size >= INT_MAX)) {
goto fail;
}
char *str = malloc(size + 1); //+1 for null
if (str == NULL) {
goto fail;
}
int r = vsnprintf(str, size + 1, fmt, ap); //+1 for null
if ((r < 0) || (r > size)) {
free(str);
goto fail;
}
*strp = str;
return r;
fail:
*strp = NULL;
return -1;
}
int asprintf(char** strp, const char* fmt, ...)
{
int r;
va_list ap;
va_start(ap, fmt);
r = vasprintf(strp, fmt, ap);
va_end(ap);
return r;
}
#endif
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