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cmd.c

+#include "cmd.h"
+#include "mobile.h" /* Mobile type for player management */
+#include "exits.h" /* getDir and DIRECTION type */
+#include "location.h"
+#include <string.h> /* strtok, strlen */
+#include <strings.h> /* strcasecmp */
+#include <stdio.h> /* printf and stdin */
+#include <stdlib.h> /* exit and free */
+
+static const char prompt[]="-->";
+static const char sep[]="     \n";
+
+/* react to command "help": print the help message and return */
+void cmdHelp()
+{
+    printf(
+        "General help\n"
+        "To play, just enter commands after the prompt '-->'\n"
+        "Available commands are:\n"
+        "- help:         to get this help\n"
+        "- quit:         to quit this game\n"
+        "- look <where>: to look at places, objects, etc. Use 'look around' to look at the\n"
+        "                current room, 'look me' to have a look at yourselves, and\n"
+        "                'look <dir>' to look in the given direction (e.g. 'look east' to\n"
+        "                look east from the current room). Allowed directions are north, east,\n"
+        "                south, west, up, and down.\n"
+        "- go <dir>:     to go in the given direction.\n"
+    );
+}
+
+/* react to command "quit": properly shuts the game down using GameShutdown and exit */
+void cmdQuit(Game *game)
+{
+	game=GameShutdown(game);
+    exit(0);
+}
+
+/* 
+    react to command "look". What to look is provided by args. It may be:
+    - me: have a look at yourselves
+    - around: look at the place you're in
+    - <direction>: take a peek in the given direction
+    - else just print "You look at <args>"
+ */
+
+void cmdLook(Game *game, char *args)
+{
+    if (!args || strlen(args)==0) 
+    {
+        printf("You must tell what to look (cf 'Help')\n");
+        return;
+    }
+    Mobile *player=game->player;
+    if (!strcasecmp(args,"me")) MobilePrint(player);
+    else if (!strcasecmp(args,"around"))
+				LocationPrint(game->player->loc);
+		else
+				printf("You look %s. Well nothing there. You (God) should create some locations...\n",args); // default message
+}
+/* react to command "go". The direction to move in is given by args */
+void cmdGo(Game *game,char *args)
+{
+    if (!args || strlen(args)==0) 
+    {
+        printf("You must provide a direction to go to (cf 'Help')\n");
+        return;
+    }
+
+    Direction dir=strtodir(args);
+    if (dir == WRONGDIR) printf("You cannot go %s\n",args);
+    else printf("t");
+}
+
+
+/* 
+    read a line from standard input and return it. 
+    The returned string was allocated using malloc and free must be called for deallocation 
+*/
+char *getInput()
+{
+    char *line=NULL;
+    size_t linecap=0;
+    printf("%s ",prompt); /* print the prompt before reading the line */
+    getline(&line,&linecap,stdin); /* allocates line, which will have to be freed */
+    return line;
+}
+
+/* 
+    parse the input line in two words: the first word is the command and the second is the argument
+    line and game must be non-null pointers for anything to happen 
+*/
+void parseAndExecute(char *line, Game *game)
+{
+    if (line && game) /* check pointers validity */
+    {
+        char *name=strtok(line,sep); /* extract first word = command */
+        if (name) // null pointer if line just contains a return (empty line)
+        {
+            char *args=strtok(NULL,sep); /* extract the second word = argument. The rest of the line is disregarded */
+            /* call the appropriate function, depending on the command */
+            if (!strcasecmp(name,"help")) cmdHelp(); /* cmd=="help" -> call cmdHelp() */
+            else if (!strcasecmp(name,"quit")) cmdQuit(game); /* cmd=="quit" -> call cmdQuit(). Also properly shuts the game down */
+            else if (!strcasecmp(name,"look")) cmdLook(game,args); /* cmd=="look" -> call cmdLook(). args specify where/what to look. game contains the necessary info about stuff to look at */
+            else if (!strcasecmp(name,"go")) cmdGo(game,args); /* cmd="go" -> call cmdGo(). args specify where to go. game contains info about locations and will update the player's location */
+            else printf("Command not found. Try 'help'\n");
+        }
+        else printf("Command not found. Try 'help'\n");
+    }
+}
+
+/* reads a user input command line and process to progress in the game */
+void processCommand(Game *g)
+{
+    char *s=getInput(); /* reads a user input line */
+    parseAndExecute(s,g); /* process it, and move in the game */
+    if (s) free(s); /* deallocate the string from getInput() */
+}