/**

 *----------------------------stdio.h---------------------------------------

 *  int printf(const char *format, ...)

 *  int fprintf(FILE *stream, const char *format, ...)

 *  int sprintf(char *str, const char *format, ...)

 *  int snprintf(char *str, size_t size, const char *format, ...)

 *

 * --------------------------stdarg.h---------------------------------------

 *  int vprintf(const char *format, va_list ap)

 *  int vfprintf(FILE *stream, const char *format, va_list ap)

 *  int vsprintf(char *str, const char *format, va_list ap)

 *  int vsnprintf(char *str, size_t size, const char *format, va_list ap)

 */

#include <stdio.h>

#include <stdarg.h>

int _vprintf(const char *fmt, ...){

        int ret;

        va_list ap;

        va_start(ap, fmt);

        ret = vprintf(fmt, ap);

        va_end(ap);

        return ret;

}

int _vfprintf(const char *fmt, ...){

        int ret;

        va_list ap;

        va_start(ap, fmt);

        ret = vfprintf(stdout, fmt, ap);

        va_end(ap);

        return ret;

}

int _vsprintf(const char *fmt, ...){

        char buf[];

        int ret;

        va_list ap;

        va_start(ap, fmt);

        ret = vsprintf(buf, fmt, ap);

        printf("%s", buf);

        va_end(ap);

        return ret;

}

int _vsnprintf(const char *fmt, ...){

        char buf[];

        int ret;

        va_list ap;

        va_start(ap, fmt);

        ret = vsnprintf(buf, sizeof(buf),fmt, ap);

        printf("%s", buf);

        va_end(ap);

        return ret;

}

int main(){

        int ret;

        char buf[];

        //printf

        ret = printf("%d---%s\n", , "printf");

        printf("ret = %d\n", ret);

        //fprintf

        ret = fprintf(stdout, "%d---%s", , "fprintf");

        printf("ret = %d\n", ret);

        //sprintf

        ret = sprintf(buf, "%d---%s", , "sprintf");

        printf("%s, ret = %d\n", buf, ret);

        //snprintf

        ret = snprintf(buf, sizeof(buf), "%d---%s", , "snprintf");

        printf("%s, ret = %d\n", buf, ret);

        //vprintf

        ret = _vprintf("%d---%s\n", , "vprintf");

        printf("ret = %d\n", ret);

        //vfprintf

        ret = _vfprintf("%d---%s\n", , "vfprintf");

        printf("ret = %d\n", ret);

        //vsprintf

        ret = _vsprintf("%d---%s\n", , "vsprintf");

        printf("ret = %d\n", ret);

        //vsnprintf

        ret = _vsnprintf("%d---%s\n", , "vsnprintf");

        printf("ret = %d\n", ret);

}