Print First Word Until Exit

Task

Implement the function prompt_command_loop

• Write a function that repeatedly reads a line from standard input
• For each line, print the first space-separated word (or the whole line if there are no spaces)
• Stop the loop and exit the program if the input line is exactly exit
• If the program receives NULL or EOF in the standard input, this should also exit the program

Function Signature

void prompt_command_loop();

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Example

$ ./prompt_command_loop
hello world
hello
foo bar baz
foo
exit

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Code

void prompt_command_loop(){
    char buffer[100];
    while(fgets(buffer, sizeof(buffer), stdin) != NULL){
        int len = strlen(buffer);
        if (len > 1 && buffer[len - 1] == '\n'){buffer[len - 1] = 0;}
 
        if (strcmp(buffer, "exit") == 0){break;}
 
        int i;
        char word[100];
        for(i = 0; buffer[i] == ' '; i++){
            word[i] = buffer[i];
        }
        while(buffer[i] != ' ' && buffer[i] != 0){
            word[i] = buffer[i];
            i++;
        }
        word[i] = 0;
 
        printf("%s\n", word);
    }
};