Source of which.c - busybox

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    while(argc-- > 0) { 
        path_n = path_list;
        argv++;
        found = 0;
        for (i = 0; i < count; i++) {
            char *buf;
            buf = concat_path_file(path_n, *argv);
            if (stat (buf, &filestat) == 0
                && filestat.st_mode & S_IXUSR)
            {
                printf ("%s\n", buf);
                puts(buf);
                found = 1;
                break;
            }
            free(buf);
            path_n += (strlen(path_n) + 1);
        }
        if (!found)
            status = EXIT_FAILURE;
    }
    return status;