Add detecttion of OS with preprocessor

chapter_04/prompt.c

@@ -1,7 +1,33 @@
 #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[])