2d Array Sorting by Column in C - c

Question

I have the code below that can produce
[p18d541#csci112 program1]$ ./main 17 < inp17.txt
12 25 110 168
35 64 113 134
91 158 183 217
102 129 130 146
26 116 215 223
0 78 81 162
19 25 204 222
124 138 157 245
137 183 201 249
61 67 106 236
60 71 106 236
63 81 106 240
14 27 111 168
17 27 111 168
26 116 215 220
111 137 202 249
111 137 202 246
from an input of
168.12.110.25
64.113.134.35
217.158.91.183
102.130.129.146
215.116.26.223
81.162.78.0
19.204.25.222
245.124.138.157
137.249.183.201
106.61.236.67
106.71.236.60
106.81.240.63
168.14.111.27
168.17.111.27
215.116.26.220
137.249.111.202
137.246.111.202
so my code scans in the input stores the values in network
and then I need to arrange them by the column from least to greatest starting at the first number and working its way to the right. an example of a the first few would be
0 78 81 162
12 25 110 168
14 27 111 168
.
.
.
111 137 202 246
111 137 202 249
.
.
.
.
//declare libraries
#include <stdio.h>
#include <stdlib.h>
//declare other functions/files to be used in the program
void print_fun(void);
int sort_fun(int arg, unsigned char networks[arg][4]);
void read_fun(void);
//read command line input and store the information
int main(int argc, char** argv){
//declar variable
int arg = 0;
//make argv into an int
arg = atoi(argv[1]);
//assign size to networks
unsigned char networks[arg][4];
//assign input to networks
for (int j =0; j<1; ++j){
if(argc == 1)
{
printf("ERROR ERROR, you messed up\n");
}
else
{
// hold network addresses in a 2-d array, with 4 nsigned char
for(int k = 0; k<arg; k++){
for (int i =0; i<4; i++){
scanf("%hhu.", &networks[k][i]);
//checks to see if scanf was working roperly
// printf(" %hhu",networks[k][i]);
}
//printf("\n");
}}}
sort_fun(arg, networks);
//sort array
//count networks
//print info about the array
return(0);
}
int sort_fun(int arg, unsigned char networks[arg][4]){
//declaring variabes
//sorting by comlumn p
for (int k = 0; k < arg; k++){
for( int i = 0; i < 4; i++){
for (int j = i+1; j<4; ++j){
if (networks[k][i] > networks[k][j]) {
int swap = networks[k][i];
networks[k][i] = networks[k][j];
networks[k][j] = swap;
}
}
}
}
for (int i =0; i<arg; i++){
for (int j =0; j < 4; j++){
printf(" %hhu", networks[i][j]);
}
printf("\n");
}
return(0);
}
I have tried switching around the variables in my for loop and messing with the values, but I cannot seem to figure out how to change my code to work in columns instead of rows.
and by the way each value is stored in a separate array element but they need to stick together like in the input, so when one number moves the whole line moves with it. please let me know what you think. thank you.