Question

#include <stdio.h>
#include <inttypes.h>

int main(void)
{
    int8_t int8;
    int16_t int16;
    int32_t int32;
    int64_t int64;

    uint8_t uint8;
    uint16_t uint16;
    uint32_t uint32;
    uint64_t uint64;

    scanf("%"SCNd8"%"SCNd16"%"SCNd32"%"SCNd64"%"SCNu8"%"SCNu16"%"SCNu32"%"SCNu64, 
            &int8, &int16, &int32, &int64, &uint8, &uint16, &uint32, &uint64);

    printf("%"PRId8"\n%"PRId16"\n%"PRId32"\n%"PRId64"\n%"PRIu8"\n%"PRIu16"\n%"PRIu32"\n%"PRIu64"\n",
            int8, int16, int32, int64, uint8, uint16, uint32, uint64);

    return 0;
}

I can’t compile this code using latest gcc + MinGW + Netbeans + Windows. Netbeans says “unable to resolve identifier SCNd8 and SCNu8”. I can’t find any reference for SCNd8 and SCNu8 on gcc man page although http://linux.die.net/include/inttypes.h defines them. I don’t receive syntax error for using PRId8 or PRIu8.

MinGW inttypes.h (lacks SCNd8 and SCNu8 ) (sample code)

#define PRIXFAST64 "I64X"

#define PRIXMAX "I64X"
#define PRIXPTR "X"

/*
 *   fscanf macros for signed int types
 *   NOTE: if 32-bit int is used for int_fast8_t and int_fast16_t
 *   (see stdint.h, 7.18.1.3), FAST8 and FAST16 should have
 *   no length identifiers
 */

#define SCNd16 "hd"
#define SCNd32 "d"
#define SCNd64 "I64d"

#define SCNdLEAST16 "hd"
#define SCNdLEAST32 "d"
#define SCNdLEAST64 "I64d"

#define SCNdFAST16 "hd"    

Answer 1

You could add the following after #include <inttypes.h>:

#ifndef SCNd8
  #define SCNd8 "hhd"
#endif
#ifndef SCNu8
  #define SCNu8 "hhu"
#endif

Which should be appropriate for most platforms.

Clarification:
Where “most platforms” refers to platforms with a C99-compliant fscanf/scanf that can handle the hh prefix for char, not just the h prefix for short.