because strtok was being evil

strtok.c

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

int stroccurs (const char* src, const char delim) {
    int occurances = 0;
    char c;

    while ((c = *src++)) {
        if (c == delim)
            occurances++;
    }

    return occurances;
}

int strpos (const char* haystack, const char needle, const int start) {
    int pos = -1, i;

    for (i = start; i < strlen(haystack); i++) {
        if (*(haystack+i) == needle) {
            pos = i;
            break;
        }
    }

    return pos;
}

char *substr (const char *src, const int start, const int len) {
    int i, j = 0;
    char *save = (char*)malloc(sizeof(char) * (len + 1));

    for (i = start; i < start+len; i++) {
        *(save+(j++)) = *(src+i);
    }

    *(save+len) = '\0';

    return save;
}

char **strsplit (const char* src, const char delim) {
    int splits = stroccurs(src, delim), i = 0, j = 0, k = 0, len = strlen(src);
    char *match, **matches;

    matches = malloc(sizeof(char) * len);

    j = strpos(src, delim, i);

    while (j != -1 && j < len) {
        matches[k++] = substr(src, i, j - i);
        i = ++j;
        j = strpos(src, delim, i);
    }

    matches[k++] = substr(src, i, len - i);
    matches[k++] = NULL;

    return matches;
}

int main(int argc, char **argv) {
    char *PATH = "/bin:/usr/bin:/sbin:/usr/sbin:/home";
    int count = stroccurs(PATH, ':') + 1, i;
    char **matches = strsplit(PATH, ':');

    printf("Matches: %d\n", count);

    for (i = 0; i < count; i++) {
        printf("Match %d: '%s'\n", i+1, matches[i]);
    }

    free(matches);

    return 0;
}

$ gcc -std=c11 -o strtok strtok.c && ./strtok
Matches: 5
Match 1: '/bin'
Match 2: '/usr/bin'
Match 3: '/sbin'
Match 4: '/usr/sbin'
Match 5: '/home'