int type.
Varies enormously on various platforms, with 32 bits on almost all and 64 bits on some.
See at:
We have a string with more than 4GB, in pointers (64 bits) "const char * conv" and "char * buff"
.
The convlen size is int (32 bits).
int memcmp ( const void * ptr1, const void * ptr2, size_t num )
void * memcpy ( void * destination, const void * source, size_t num );
Both expect size_t, as a length parameter (num).
oplen is declared as int type.
While int addresses all the need for options, correcting convlen,
oplen is compared to convlen and used as the index of a string (size_t),
the appropriate type of which is used is size_t or ptrdiff_t.
return conv + oplen; /* pointer arithmetic with int type */
#include <stdio.h>
int main()
{
printf ("sizeof(size_t)=%llu\n", sizeof(size_t));
printf ("sizeof(int)=%llu\n", sizeof(int));
return 0;
}
sizeof(size_t)=8
sizeof(int)=4
Thus, the code follows good programming practices in C, and becomes 64-bit compatible.
regards,
Ranier Vilela
