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

const char* shell_prompt = "rocksh> ";

static void process_cmd(const char* cmd) {
    size_t cmd_len = strlen(cmd);
    if (cmd_len < 1) {
        return;
    }

    if (strcmp(cmd, "exit") == 0) {
        printf("bye!\n");
        exit(0);
    }

    printf("command not recognized: %s\n", cmd);
}

int main(int argc, char *argv[]) {
    (void)argc;
    (void)argv;

    char cmd[128];
    size_t p = 0;
    
    printf("%s", shell_prompt);

    while (1) {
        char c = getchar();
        printf("%c", c);
        if (c != '\n') {
            cmd[p++] = c;
            continue;
        }

        cmd[p] = 0;
        process_cmd(cmd);
        memset(cmd, 0, 128);
        p = 0;
        printf("%s", shell_prompt);
    }
    
    return 0;
}