How to split a string into pieces of a specified length in C?

Question

C++ / C#

There is a certain string (more precisely, an array of characters) and I want to split it into several even pieces (get an array of character arrays). True, the latter may be shorter. How to do it?

Answer 1

It depends on how you want to get the result, and what you mean by "split".
Here's an example for you:

#include <stdio.h>
int main()
{
    char string[] = "123456789";
    char (*r)[3] = (char (*)[3])string;

    printf("%c%c%c", r[1][0], r[1][1], r[1][2]);
    return 0;
}

Refine your question.

Answer 2

Nafig array of arrays, just make an array of pointers and you will be happy.

Answer 3

Not tested!

/* Declare */
char s[] = "qwerrtrhfdbsgfvasdg";
const int fraglen = 3;

/* Parse */
int slen = strlen(s);
int nfrags = (slen + fraglen - 1 ) /  fraglen;
char *p[] = malloc(nfrags * sizeof(char*));
int i;
for (i = 0; i < nfrags; i++)
        p[i] = strndup(&s[i * fraglen], fraglen);

/* Print */
for (i = 0; i < nfrags; i++)
        printf("%d = \"%s\"\n", i, p[i]);

/* Done */
for (i = 0; i < nfrags; i++)
        free(p[i]);
free(p);