Fixed some warnings and possible overflows

Author: Marek

console.c

@@ -85,7 +85,8 @@ my_print(char *str)
 void c_refresh(void)
 {
 #ifdef SCREEN_BUFFERING
-	write(1,screen_buffer,screen_buffer_pos);
+	ssize_t ret = 0;
+	ret = write(1,screen_buffer,screen_buffer_pos);
 	screen_buffer_pos=0;
 #else
 	fflush(stdout);
@@ -206,7 +207,7 @@ void c_sethlt_bg(unsigned char hlt,unsigned char bg)
 void c_setcolor_3b(unsigned char a)
 {
 	char txt[8];
-	snprintf(txt,16,"\033[%dm",30+(a&7));
+	snprintf(txt,sizeof(txt),"\033[%dm",30+(a&7));
 	my_print(txt);
 }
 

kbd.c

@@ -137,7 +137,8 @@ int os2_read_mon(unsigned char *data, int len)
 int my_getchar(void)
 {
 	unsigned char a;
-	read(0,&a,1);
+	ssize_t ret = 0;
+	ret = read(0,&a,1);
 	return a;
 }
 

server.c

@@ -905,8 +905,8 @@ void send_message(struct player* player, char *name, char *msg)
 	int len;
 
 	packet[0]=P_MESSAGE;
-	if (!name){snprintf(packet+1,256,"%s",msg);len=strlen(msg)+1+1;}
-	else {snprintf(packet+1,256,"%s> %s",name,msg);len=strlen(name)+strlen(msg)+1+3;}
+	if (!name){snprintf(packet+1,sizeof(packet)-1,"%s",msg);len=strlen(msg)+1+1;}
+	else {snprintf(packet+1,sizeof(packet)-1,"%s> %s",name,msg);len=strlen(name)+strlen(msg)+1+3;}
 	send_chunk_packet_to_player(packet,len,player);
 }