Thread: How do you return a value and pointer from a function?

Originally Posted by bobv

Any example? When you know how everything seems easy, but if you don't well... I know it's a u32 and what the values are but getting it there is another story, at leaset for me. The fact that the 4 bytes need to be in little endian format is another matter but I can deal w/that.

Code:

     // IP converter
#include <stdio.h>
#include <string.h>

unsigned long ConvertIP(char *IPString)
  {
    union t_cvt
      { unsigned long ip;
        unsigned char bv[4]; }
    cvt;

    sscanf(IPString,"%hhu.%hhu.%hhu.%hhu",&cvt.bv[0],&cvt.bv[1],&cvt.bv[2],&cvt.bv[3]);

    // for diagnostic only remove in use
    printf("%u %u %u %u\n\n",cvt.bv[0],cvt.bv[1],cvt.bv[2],cvt.bv[3]);

    return cvt.ip; }


int main (void)
  { char ipstr[17];
    unsigned int ipaddr;

    printf("Enter an IP address : ");
    scanf("%s",ipstr);
 
    ipaddr = ConvertIP(ipstr);

    printf("\n %x\n\n",ipaddr);

    return 0; }

To flip between little endian and big endian... simply reverse the assignment order in line 12