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

mytypedef_t x;

/* ... */

printf("%ju", (uintmax_t) x);

Compliant Solution (Microsoft printf())

Visual Studio 2012 and earlier versions do not support the standard  j length modifier or have a non-standard analogue.  Consequently, you'll need to hard code the knowledge that intmax_t is int64_t and uintmax_t is uint64_t for Microsoft Visual Studio versions.

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

mytypedef_t x;

/* ... */

#ifdef _MSC_VER
  printf("%llu", (uintmax_t) x);
#else
  printf("%ju", (uintmax_t) x);
#endif  

Microsoft has submitted a feature request to add support for the j length modifier to a future release of Microsoft Visual Studio.

Noncompliant Code Example (scanf())

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

mytypedef_t x;
uintmax_t temp;

/* ... */

if (scanf("%ju", &temp) != 1) {
  /* handle error */
}
if (temp > MYTYPEDEF_MAX) {
  /* handle error */
}
else {
  x = temp;
} 

Compliant Solution (Microsoft scanf())

Visual Studio 2012 and earlier versions do not support the standard  j length modifier or have a non-standard analogue.  Consequently, you'll need to hard code the knowledge that intmax_t is int64_t and uintmax_t is uint64_t for Microsoft Visual Studio versions.

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

mytypedef_t x;
uintmax_t temp;

/* ... */
#ifdef _MSC_VER
#  define UINTMAX_CS "%llu"
#else
#  define UINTMAX_CS "%ju"
#endif

if (scanf(UINTMAX_CS, &temp) != 1) {
 /* handle error */
}
if (temp > MYTYPEDEF_MAX) {
  /* handle error */
}
else {
  x = temp;
} 

Microsoft has submitted a feature request to add support for the j length modifier to a future release of Microsoft Visual Studio.

Risk Assessment

Failure to use an appropriate conversion specifier when inputting or outputting programmer-defined integer types can result in buffer overflow and lost or misinterpreted data.

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