split.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char ** split(char * string, char * delim) {
    int count = 0;
    char * tmp = string;
    while (strstr(tmp, delim))
        tmp = strstr(tmp, delim) + strlen(delim), count++;
    char ** result = malloc(sizeof(char *) * (count + 2));
    tmp = string;
    for (int i = 0; i < count; i++) {
        char * token = strstr(tmp, delim);
        result[i] = malloc(sizeof(char) * (token - tmp + 1));
        strncpy(result[i], tmp, token - tmp);
        result[i][token - tmp] = '\0';
        tmp = token + strlen(delim);
    }
    result[count] = malloc(sizeof(char) * (strlen(tmp) + 1));
    strcpy(result[count], tmp);
    result[count + 1] = NULL;
    return result;
}

void free_split(char ** res) {
    for (int i = 0; res[i]; i++)
        free(res[i]);
    free(res);
}

int main() {
    char * result = "This+-+Is+-+A+-+Message";
    char * delim = "+-+";
    char ** tokens = split(result, delim);
    for (int i = 0; tokens[i] != NULL; i++)
        printf("%s\n", tokens[i]);
    free_split(tokens);
}