split unsigned char array

[Suzie999]

I'm trying to split an array which is that of unsigned char where NULL marks the split point
I have written this code, but it just looks clunky, and I would like to ask advice on any other
more efficient methods of doing such a thing there might be.

#include "stdafx.h"
#include <stdlib.h>
#include <iostream>
#include <sstream>
#include <stdio.h>

#define mymaxarray 256

typedef unsigned char uchar;

using namespace std;

void testFunc00(uchar *, int, uchar **);



int _tmain(int argc, _TCHAR* argv[])
{
    char c;
    uchar a1[mymaxarray] = {0};
    uchar a2[mymaxarray] = {0};
    uchar a3[mymaxarray] = {0};
    uchar a4[mymaxarray] = {0};

    uchar * arrayofarray[4] = {a1,a2,a3,a4};

    uchar testarray[30] = {'1','1','1','\0','1','1','1','1','1','1','1','\0','1','1','1','1','1','1','1','1','1','1','1','1','1','\0','1','1','1','\0'};

    testFunc00(testarray, 30, arrayofarray);

    int x = 0;

    while (a1[x]) {
        cout << a1[x] << endl;
        x++;
    }

    cout << endl;
    x = 0;
    while (a2[x]) {
        cout << a2[x] << endl;
        x++;
    }

    cout << endl;
    x = 0;
    while (a3[x]) {
        cout << a3[x] << endl;
        x++;
    }

    cout << endl;
    x = 0;
    while (a4[x]) {
        cout << a4[x] << endl;
        x++;
    }

    cin >> c;
    return 0;
}



void testFunc00(uchar * in, int len, uchar ** out){

    int i = 0;
    int n = 0;
    while (in[i]) {

        out[0][n] = in[i];
        i++;
        n++;
    }

    i++;
    n = 0;
    while (in[i]) {

        out[1][n] = in[i];
        i++;
        n++;
    }

    i++;
    n = 0;
    while (in[i]) {

        out[2][n] = in[i];
        i++;
        n++;
    }

    i++;
    n = 0;
    while (in[i]) {

        out[3][n] = in[i];
        i++;
        n++;
    }

}

Sorry if code is unformatted, cannot seem to preview.

[mike_2000_17]

Whenever you see code being repeated over and over, a light should come up saying: "I could probably use a loop for this!". For starter, you could easily condense your function into a single set of nested for-loops, as so:

void testFunc00(uchar * in, int len, uchar ** out) {
    int i = 0;
    for(int j = 0; j < 4; ++j) {
      for(int n = 0; (i < len) && (in[i] != '\0'); ++i, ++n)
        out[j][n] = in[i];
      ++i;
    }
}

You could probably add the maximum number of splits as a parameter too:

void testFunc00(uchar * in, int len, uchar ** out, int max_splits) {
    int i = 0;
    for(int j = 0; (i < len) && (j < max_splits); ++j) {
      for(int n = 0; (i < len) && (in[i] != '\0'); ++i, ++n)
        out[j][n] = in[i];
      ++i;
    }
}

[littlemisschic]

Thanks for clearing this up as I've been experiancing some problems with the script!
Look forward to your new posts.

[Suzie999]

Hi mike 2000 17.
I'm happy to say that light did flash, and I've been trying to make a loop
which has been failing, by always reporting the amount of arrays as 10 (count)
and printing the garbage after the last '\0'

I will look at your code and try to implement it.
Thank you for time and support.

#include "stdafx.h"
#include <stdlib.h>
#include <iostream>
#include <sstream>
#include <stdio.h>

#define mymaxarray 256

typedef unsigned char uchar;

using namespace std;

int testFunc00(uchar *, int, uchar **);



int _tmain(int argc, _TCHAR* argv[])
{
    int arraycount = 0;
    char c;
    uchar a1[mymaxarray] = {0};
    uchar a2[mymaxarray] = {0};
    uchar a3[mymaxarray] = {0};
    uchar a4[mymaxarray] = {0};
    uchar a5[mymaxarray] = {0};
    uchar a6[mymaxarray] = {0};
    uchar a7[mymaxarray] = {0};
    uchar a8[mymaxarray] = {0};
    uchar a9[mymaxarray] = {0};
    uchar a10[mymaxarray] = {0};

    uchar * arrayofarray[10] = {a1,a2,a3,a4,a5,a6,a7,a8,a9,a10};

    uchar testarray[30] = {'1','1','1','\0','1','1','1','1','1','1','1','\0','1','1','1','1','1','1','1','1','1','1','1','1','1','\0','1','1','1','\0'};

    arraycount = testFunc00(testarray, 30, arrayofarray);

    cout << "Number of arrays filled " << arraycount << endl;

    int x = 0;

        for (int i = 0; i < arraycount; i++) {

        while (arrayofarray[i][x]) {
            cout << arrayofarray[i][x] << endl;
            x++;
        }
        cout << endl;
        x = 0;
    }

    cin >> c;
    return 0;
}



int testFunc00(uchar * in, int len, uchar ** out){

    int count = 1;
    int i = 0;
    int n = 0;

    for (int numarrays = 0; numarrays < 9; numarrays++) {

        if (in[i]) {
            while (in[i]) {

                out[numarrays][n] = in[i];
                i++;
                n++;
            }
            count++;
            i++;
        }
        else {
            return count;
        }
        n = 0;

    }

    return count;
}