sslice.c

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

struct sslice {
	const char *ptr;
	size_t sz;
};

int 
strslice(const char *s , size_t sz, const char * delim, struct sslice * result, int n) {
	int i=0;
	if (sz == 0)
		sz = strlen(s);
	while (i<n && sz>0) {
		size_t j;
		if (strchr(delim, *s)) {
			++s;
			--sz;
			continue;
		}
		result[i].ptr = s++;
		--sz;
		for (j=0;j<sz;j++,s++) {
			if (strchr(delim, *s)) {
				break;
			}
		}
		result[i].sz = j+1;
		sz-=j;
		++i;
	}
	return i;
}

#define MAXSLICE 2

int
main() {
    const char * a = "hello world foobar";
    struct sslice result[MAXSLICE];
    int n = strslice(a, 0, " \t\n\r", result, MAXSLICE);
    int i;
    for (i=0;i<n;i++) {
        printf("%d %.*s\n", i, (int)result[i].sz, result[i].ptr);
    }
    while (n==MAXSLICE) {
        const char * ptr = result[n-1].ptr+result[n-1].sz;
        n = strslice(ptr, 0, " \t\n\r", result, MAXSLICE);
        for (i=0;i<n;i++) {
            printf("%d %.*s\n", i, (int)result[i].sz, result[i].ptr);
        }
    }

    return 0;
}