strtoknize.c

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

char **strtoknize(const char *str, size_t slen, const char *dlmt, int dlen, int  *n_toks)
{
        char *toks = alloca(slen);
        char *save_ptr = NULL;
        char *ptr = NULL;
        int i;
        char **buffer = NULL;

        strncpy(toks, str, slen);

        if (!strcmp(&toks[slen - dlen], dlmt)) {
                toks[slen - dlen] = '\0';
        }

        i = 0;
        ptr = strtok_r(toks, dlmt, &save_ptr);
        while (ptr) {
                i++;
                buffer = realloc(buffer, sizeof (char **) * i);
                assert(buffer);
                buffer[i - 1] = strdup(ptr);
                assert(buffer[i - 1]);
                ptr = strtok_r(NULL, dlmt, &save_ptr);
        }

        *n_toks = i;
        return buffer;
}

int main(void)
{
        char **buffer;
        int i;
        int n_toks;

#define STR "foo||bar||tar||zar||"
        buffer = strtoknize(STR, strlen(STR),
                            "||", 2, &n_toks);

        for (i = 0; i < n_toks; i++) {
                puts(buffer[i]);
        }

        return 0;
}