build_your_own_lisp/chapter_04/prompt.c

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


/* If we are on Windows compile these functions */
#ifdef _WIN32
#include <string.h>
#include <assert.h>

static char buffer[2048];

/* Fake readline function */
char* readline(char* prompt) {
    fputs(prompt, stdout);
    fgets(buffer, 2048, stdin);
    char* cpy = malloc(strlen(buffer)+1);
    assert(cpy != NULL)
    strcpy(cpy, buffer);
    cpy[strlen(cpy)-1] = '\0';
    return cpy;
}

/* Fake add_history function */
void add_history(char* unused) {}

/* Otherwise include the editline headers
   could use __APPLE__ for detection of OSX */
#else
#include <editline/readline.h>
#endif


int main(int argc, char const *argv[])
{
    /* Print version and exit information */
    puts("Lispy version 0.0.0.0.1");
    puts("Press Ctrl+c to exit\n");

    /* In a never ending loop */
    while (1) {
        /* Output our prompt and get input */
        char* input = readline("lispy> ");

        /* Add input to history */
        add_history(input);

        /* Echo input back to user */
        printf("No you're a %s\n", input);

        /* Free retrieved input */
        free(input);
    }

    return 0;
}