main: fixed error handling when we can't read rom file

gui.c

@@ -18,6 +18,8 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <ncurses.h>
+#include <string.h>
+#include "simdata.h"
 
 int terminal_width;
 int terminal_height;
@@ -43,22 +45,74 @@ int gui_ncurses_refresh(){
 	return 0;
 }
 
+char *tab_name[]={"Overview","Memory","Test"};
+
+unsigned int CURRENT_TAB=0;
+
+enum CPU_STATE_t CPU_STATE=STOPPED;
+
+void update_tabs(){
+	wattron(tabs,COLOR_PAIR(2));
+	for(int i=0;i<terminal_width;i++)
+		wprintw(tabs," ");
+
+	int x=1;
+	for(unsigned int i=0;i<sizeof(tab_name)/sizeof(tab_name[0]);i++){
+		if(i==CURRENT_TAB)
+			wattron(tabs,COLOR_PAIR(4));
+		else
+			wattron(tabs,COLOR_PAIR(5));
+		mvwprintw(tabs,0,x," %1d",i);
+		x+=2;
+		if(i==CURRENT_TAB)
+			wattron(tabs,COLOR_PAIR(3));
+		else
+			wattron(tabs,COLOR_PAIR(2));
+		mvwprintw(tabs,0,x," %s ",tab_name[i]);
+		x+=strlen(tab_name[i])+2+3;
+	}
+	switch(CPU_STATE){
+		case RUNNING:
+			wattron(tabs,COLOR_PAIR(6));
+			mvwprintw(tabs,0,terminal_width-13,"[ RUNNING ");
+			break;
+		case SINGLE_STEPPING:
+			wattron(tabs,COLOR_PAIR(7));
+			mvwprintw(tabs,0,terminal_width-21,"[ SINGLE-STEPPING ");
+			break;
+		case STOPPED:
+			wattron(tabs,COLOR_PAIR(8));
+			mvwprintw(tabs,0,terminal_width-13,"[ STOPPED ");
+			break;
+	}
+	mvwprintw(tabs,0,terminal_width-3,"]");
+}
+
 int start_gui(){
 	if(!initscr())
 		return 1;
 	monochrome=( has_colors() == FALSE );
+	init_color(8, 700, 700, 700);
+	init_color(COLOR_WHITE, 100, 1000, 1000);
 	if(!monochrome){
 		start_color();
 		init_pair(1, COLOR_RED, COLOR_BLACK);
+
+		//tab colors
+		init_pair(2, COLOR_BLACK, 8);
+		init_pair(3, 8, COLOR_BLACK);
+		init_pair(4, COLOR_WHITE, COLOR_BLACK);
+		init_pair(5, COLOR_WHITE, 8);
+		init_pair(6, COLOR_BLACK,COLOR_GREEN);
+		init_pair(7, COLOR_BLACK,COLOR_YELLOW);
+		init_pair(8, COLOR_BLACK,COLOR_RED);
 	}
 	noecho();
 	curs_set(0);
 	get_terminal_size();
 	mvprintw((terminal_height-3)/2+3,terminal_width/2-15,"Initialising the simulator...");
-	tabs = newwin(3,terminal_width,0,0);
-	box(tabs, 0 , 0);
-	mvwprintw(tabs,1,2,"[ 0 Overview ]");
-	mvwprintw(tabs,1,17," 1 Memory  ");
+	tabs = newwin(1,terminal_width,0,0);
+	update_tabs();
 	if(gui_ncurses_refresh())
 		return 1;
 	return 0;

main.c

@@ -23,6 +23,7 @@
 #include "simdata.h"
 #include "stdint.h"
 #include <unistd.h>
+#include <errno.h>
 
 void help(char* progname){
 	printf("Usage: %s  -i <file> \n", progname);
@@ -54,6 +55,13 @@ int main(int argc, char* argd[] ){
 
 	/// READ ROM FILE ///
 	FILE* rom=fopen(infile,"r");
+
+	if (rom == NULL) {
+		printf("ERROR: Couldn't open rom file\n");
+		perror(infile);
+		return 1;
+	}
+
 	fseek(rom, 0, SEEK_END);
 	if(ftell(rom)!=16777216){
 		printf("ERROR: ROM file isn't 16MiB\n");
@@ -87,10 +95,6 @@ int main(int argc, char* argd[] ){
 		free(RAM);
 		return 1;
 	}
-	char *temp=malloc(1000);
-	sprintf(temp,"Last byte of ram is 0x%02x",RAM[0xFFFFFF]);
-	gui_error(temp);
-	free(temp);
 
 	if(gui_continue_request()){
 		end_gui();

simdata.h

@@ -4,3 +4,9 @@ struct simdata_t{
 struct simdata_t *init_simdata();
 
 void free_simdata(struct simdata_t *);
+
+enum CPU_STATE_t{
+	RUNNING,
+	SINGLE_STEPPING,
+	STOPPED
+};