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

#define PROMPT "msh> "
#define EXIT_CMD "exit"
#define MAX_BUF 121

void echo(const char*);
void remove_newline(char*);
void exit_branch(const char*);

int main(void) {
	char buffer[MAX_BUF];
	while(1) {
		printf("%s", PROMPT);
		fgets(buffer, MAX_BUF, stdin);
		if(!strlen(buffer)) {
			return 0;
		}
		// process the input
		remove_newline(buffer);
		exit_branch(buffer);
		echo(buffer);
	}
	return 0;
}

void echo(const char* buf) {
	printf("%s\n", buf);
}


void remove_newline(char* buf) {
	char* c = buf;
	while(*c != '\n') { c++; }
	*c='\0';
}

void exit_branch(const char* buf) {
	if(strcmp(buf, EXIT_CMD)) {
		return;
	}
	exit(0);
	return; // just for gcc but exit shouldn't fail
}