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

char **
buildargv(char *input) {
    static char *arglist[256];
    int numargs = 0;

    while (1) {
        while (*input == ' ')
            input++;
        if (*input == 0)
            break;
        arglist[numargs++] = input;
        while (*input != ' ' && *input != 0)
            input++;
        if (*input == 0)
            break;
        *(input++) = 0;
    }
    arglist[numargs] = NULL;
    return arglist;
}


int main() {
    char **args;
    char input[256];
    int i;

    strcpy(input, " a b");
    args = buildargv(input);

    if (strcmp(args[0], "a"))
        abort();
    if (strcmp(args[1], "b"))
        abort();
    if (args[2] != NULL)
        abort();

    exit(0);
}
