Convert a preprocessor token to a string

#define MAX_LEN 16

char val[MAX_LEN+1]; // room for
sscanf(buf, "%"MAX_LEN"s", val);

#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
#define AT __FILE__ ":" TOSTRING(__LINE__)

#define VERSION_MAJOR 4
#define VERSION_MINOR 47

#define VERSION_STRING "v" #VERSION_MAJOR "." #VERSION_MINOR

#define VERSION_MAJOR 4
#define VERSION_MINOR 47

#define STRINGIZE2(s) #s
#define STRINGIZE(s) STRINGIZE2(s)
#define VERSION_STRING "v" STRINGIZE(VERSION_MAJOR)
"." STRINGIZE(VERSION_MINOR)

#include <stdio.h>
int main() {
    printf ("%sn", VERSION_STRING);
    return 0;
}

sscanf(buf, "%" #MAX_LEN "s", val);

#define STR1(x)  #x
 #define STR(x)  STR1(x)
 sscanf(buf, "%" STR(MAX_LEN) "s", val);

#define MAX_LEN    16
#define MAX_LEN_S "16"

char val[MAX_LEN+1];
sscanf(buf, "%"MAX_LEN_S"s", val);

strncpy(val, buf, MAX_LEN);
val[MAX_LEN] = '';

sprintf(buf, "%*s", MAX_LEN, val);