/******************************************************************************
 ******* include guard ********************************************************
 ******************************************************************************/
#ifndef ALX_STDIO_SBPRINTF_H
#define ALX_STDIO_SBPRINTF_H


/******************************************************************************
 ******* headers **************************************************************
 ******************************************************************************/
#include <stdio.h>

#include "libalx/base/assert/assert.h"
#include "libalx/base/compiler/size.h"


/******************************************************************************
 ******* macros ***************************************************************
 ******************************************************************************/
/* int  sbprintf(buff[restrict], const char *restrict format, ...); */
#define sbprintf(buff, format, ...)     (                               \
{                                                                       \
        alx_static_assert_array(buff);                                  \
                                                                        \
        snprintf(buff, sizeof(buff), format, ##__VA_ARGS__) >= SSIZEOF(buff) \
}                                                                       \
)


/******************************************************************************
 ******* include guard ********************************************************
 ******************************************************************************/
#endif      /* libalx/base/stdio/sbprintf.h */

/******************************************************************************
 ******* include guard ********************************************************
 ******************************************************************************/
#ifndef ALX_STDIO_SBPRINTF_H
#define ALX_STDIO_SBPRINTF_H


/******************************************************************************
 ******* headers **************************************************************
 ******************************************************************************/
#include <stdio.h>

#include "libalx/base/assert/assert.h"
#include "libalx/base/compiler/size.h"


/******************************************************************************
 ******* macros ***************************************************************
 ******************************************************************************/
/* int  sbprintf(char buff[restrict], const char *restrict format, ...); */
#define sbprintf(buff, format, ...)     (                               \
{                                                                       \
        alx_static_assert_array(buff);                                  \
                                                                        \
        snprintf(buff, sizeof(buff), format, ##__VA_ARGS__) >= SSIZEOF(buff) \
}                                                                       \
)


/******************************************************************************
 ******* include guard ********************************************************
 ******************************************************************************/
#endif      /* libalx/base/stdio/sbprintf.h */

EDIT:

The actual name of the macro in my library is alx_sbprintf to avoid using a name that may end up being used by a future implementation.