Page History

...

• memset()
• memset_s()
• fprintf() and related functions (For the length modifier c, if no l length modifier is present, the int argument is converted to an unsigned char, and the resulting character is written.)
• fputc()
• ungetc()
• memchr()

And and to arguments to the following library functions that are converted to char:

• strchr()
• strrchr()
• All of the functions listed in <ctype.h>

The only integer type conversions that are guaranteed to be safe for all data values and all possible conforming implementations are conversions of an integral value to a wider type of the same signedness. The C Standard, subclause 6.3.1.3 [ISO/IEC 9899:2011], says,

...

#include <string.h>
#include <stddef.h>
#include <limits.h>
 
int *init_memory(int *array, size_t n) {
  return memset(array, 4096, n); 
} 

...

In general, the memset() function should not be used to initialize an integer array unless it is to set or clear all the bits., as in this compliant solution:

#include <string.h>
#include <stddef.h>
#include <limits.h>
int *init_memory(int *array, size_t n) {
  return memset(array, 0, n); 
} 

...

...