First commit

2 files changed, 225 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..34a8185
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+.PHONY: all clean
+
+CC = clang
+CFLAGS = -std=c99 -Weverything -Wno-padded
+
+all : texad
+
+clean :
+	rm -f texad
diff --git a/texad.c b/texad.c
new file mode 100644
index 0000000..9a09acf
--- /dev/null
+++ b/texad.c
@@ -0,0 +1,216 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define INPUT_LIMIT 256
+#define PROMPT "> "
+
+typedef enum {
+    UNKNOWN,
+    LOOK,
+    GO_NORTH,
+    GO_SOUTH,
+    GO_EAST,
+    GO_WEST,
+    QUIT
+} action;
+
+typedef enum {
+    NORTH,
+    SOUTH,
+    EAST,
+    WEST
+} direction;
+
+typedef struct room {
+    char *title;
+    char *description;
+    struct door **doors;
+} room;
+
+typedef struct door {
+    direction direction;
+    struct room *src;
+    struct room *dst;
+} door;
+
+typedef struct world {
+    struct player *player;
+} world;
+
+typedef struct player {
+    char *name;
+    struct room *room;
+} player;
+
+typedef struct {
+    action action;
+    char *string;
+} command;
+
+world *genesis(void);
+void apocalypse(world*);
+action parse(char*);
+void move(player*, direction);
+void look(room*);
+int loop(world*);
+
+static command commands[] = {
+    {LOOK     , "l" },
+    {GO_NORTH , "n" },
+    {GO_SOUTH , "s" },
+    {GO_EAST  , "e" },
+    {GO_WEST  , "w" },
+    {QUIT     , "q" },
+    {UNKNOWN  , NULL}
+};
+
+world *genesis(void)
+{
+    world *w;
+    player *p;
+    room *r1, *r2, *r3;
+    door *d12, *d21, *d23, *d32;
+
+    w = (world*) malloc(sizeof(world));
+    p = (player*) malloc(sizeof(player));
+    r1 = (room*) malloc(sizeof(room));
+    r2 = (room*) malloc(sizeof(room));
+    r3 = (room*) malloc(sizeof(room));
+
+    r1->title = "The foo room";
+    r1->description = "You are in the foo room. Sunlight streams from the windows.";
+
+    r2->title = "The bar room";
+    r2->description = "You are in the bar room. A vague sense of despair washes over you.";
+
+    r3->title = "The baz room";
+    r3->description = "You are in the baz room. It is richly furnished.";
+
+    d12 = (door*) malloc(sizeof(door));
+    d21 = (door*) malloc(sizeof(door));
+    d23 = (door*) malloc(sizeof(door));
+    d32 = (door*) malloc(sizeof(door));
+
+    d12->direction = EAST;
+    d12->src = r1;
+    d12->dst = r2;
+
+    d21->direction = WEST;
+    d21->src = r2;
+    d21->dst = r1;
+
+    d23->direction = NORTH;
+    d23->src = r2;
+    d23->dst = r3;
+
+    d32->direction = SOUTH;
+    d32->src = r3;
+    d32->dst = r2;
+
+    door *ds1[] = {d12, NULL};
+    door *ds2[] = {d21, d23, NULL};
+    door *ds3[] = {d32, NULL};
+
+    r1->doors = ds1;
+    r2->doors = ds2;
+    r3->doors = ds3;
+
+    p->room = r1;
+
+    w->player = p;
+
+    return w;
+}
+
+void apocalypse(world *w)
+{
+    free(w->player->room);
+    free(w->player);
+    free(w);
+}
+
+int main(void)
+{
+    world *w;
+
+    w = genesis();
+    while (loop(w));
+    apocalypse(w);
+
+    exit(EXIT_SUCCESS);
+}
+
+void look(room *r)
+{
+    printf("%s: %s\n", r->title, r->description);
+    return;
+}
+
+void move(player *p, direction dir)
+{
+    door **ds;
+    for (ds = p->room->doors; *ds; ds++)
+        if ((*ds)->direction == dir) {
+            p->room = (*ds)->dst;
+            look(p->room);
+            return;
+        }
+    puts("You can't go that way.");
+    return;
+}
+
+action parse(char *s)
+{
+    unsigned long i;
+    s[strcspn(s, "\n")] = 0;
+    for (i = 0; i < sizeof(commands) / sizeof(command); i++)
+        if (commands[i].string && !strcmp(commands[i].string, s))
+            return commands[i].action;
+    return UNKNOWN;
+}
+
+int loop(world *w)
+{
+    char input[INPUT_LIMIT];
+    action a;
+
+    printf("%s", PROMPT);
+    if (fgets(input, INPUT_LIMIT, stdin) != NULL) {
+        a = parse(input);
+
+        switch (a) {
+
+            case LOOK:
+                look(w->player->room);
+                return 1;
+
+            case QUIT:
+                return 0;
+
+            case GO_NORTH:
+                move(w->player, NORTH);
+                return 1;
+
+            case GO_SOUTH:
+                move(w->player, SOUTH);
+                return 1;
+
+            case GO_EAST:
+                move(w->player, EAST);
+                return 1;
+
+            case GO_WEST:
+                move(w->player, WEST);
+                return 1;
+
+            case UNKNOWN:
+                printf("What is \"%s\"?\n", input);
+                return 1;
+        }
+
+    } else {
+        puts("");
+        return 0;
+    }
+}