Question

Let’s say you have this structure:

struct MMFS_IDENTIFICATION
{
    char *szVendor;
    char *szControllerModel;
    char *szRevision;
    char *szId;
    char *szExecutive;
    char *szKarelRevision;
    char *szProcessName;
    char *szCommRevision;
    char *szRobotModel;
};

Is there any easy way to do something like this?

MMFS_IDENTIFICATION mmfsId;

for( int i = 0; i < 9; i++ )
{
    int len = buf[pos++];
    mmfsId[i] = malloc(len);
    memcpy( mmfsId[i], buf[pos], len );
    pos += len;
}

The only thing I know to do is copy and paste the code nine times. But I really don’t want to do that because in the real program I’m using this concept for, calculating len is not as simple as I made it in this example.

Answer 1

Since all of the structure members are char* pointers, you could do something like this:

#include <pshpack1.h>
struct MMFS_IDENTIFICATION
{
    char *szVendor;
    char *szControllerModel;
    char *szRevision;
    char *szId;
    char *szExecutive;
    char *szKarelRevision;
    char *szProcessName;
    char *szCommRevision;
    char *szRobotModel;
}; 
#include <poppack.h>

MMFS_IDENTIFICATION mmfsId;
char** pmmfsId = (char**) &mmfsId;

for( int i = 0; i < 9; ++i )
{
    int len = buf[pos++];
    pmmfsId[i] = malloc(len+1);
    memcpy( pmmfsId[i], buf[pos], len );
}