Parsing a string of numbers in C

main.c

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

int main(int argc, char* argv[]) {
    char str[] = "200, 22, 111 ";
    char* cursor = str;
    long int sum = 0;
    while (cursor != str + strlen(str)) {
        long int x = strtol(cursor, &cursor, 10);
        while (*cursor == ' ' || *cursor == ',') {
            cursor++;
        }
        sum += x;
    }
    printf("Sum is %ld\n", sum);
    return 0;
}