From 4af5ce4dd24d24df0909f75106c06514f565954d Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@raht.cworth.org>
Date: Sat, 23 Sep 2006 01:32:25 -0700
Subject: [PATCH] Add new drill2 game for drilling 2-letter words.

---
 .gitignore |   1 +
 Makefile   |   4 +-
 drill2.c   | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 132 insertions(+), 2 deletions(-)
 create mode 100644 drill2.c

diff --git a/.gitignore b/.gitignore
index 6793c73..0d0835b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 Makefile.dep
+drill2
 grid
 *.o
 *~
diff --git a/Makefile b/Makefile
index 2e1e7e0..dd05ade 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,11 @@
 WGCFLAGS=-Wall -Wextra -Wmissing-prototypes -Wno-unused-parameter
 
-PROGRAMS=grid
+PROGRAMS=grid drill2
 all: $(PROGRAMS)
 
 LIBRARY=dict.o word-game.o
 
-grid: grid.o $(LIBRARY)
+%: %.o $(LIBRARY)
 	$(CC) $(CFLAGS) $(WGCFLAGS) $(LDFLAGS) -lreadline -lm -o $@ $^
 
 %.o: %.c
diff --git a/drill2.c b/drill2.c
new file mode 100644
index 0000000..6f4a26c
--- /dev/null
+++ b/drill2.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright © 2006 Carl Worth
+ *
+ * This program is free software; you can redistribute it and\/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA."
+ */
+
+#include "word-game.h"
+
+#include <string.h>
+#include <ctype.h>
+#include <sys/time.h>
+#include <time.h>
+
+static int
+rand_within (int num_values)
+{
+    return (int) ((double) num_values * (rand() / (RAND_MAX + 1.0)));
+}
+
+static void
+shuffle (int *array, int length)
+{
+    int i, r, tmp;
+
+    for (i = 0; i < length; i++)
+    {
+	r = i + rand_within (length - i);
+	tmp = array[i];
+	array[i] = array[r];
+	array[r] = tmp;
+    }
+}
+
+static char pattern_enumerate_word[WORD_GAME_MAX_WORD_LENGTH];
+static dict_t *pattern_enumerate_answers;
+
+static void
+pattern_enumerate (const char		*pattern_chunk,
+		   dict_cursor_t	 cursor)
+{
+    char c = *pattern_chunk;
+    int last;
+
+    if (cursor == DICT_CURSOR_NIL)
+	return;
+
+    if (c == '\0') {
+	if (DICT_ENTRY_IS_WORD (dict_cursor_resolve (cursor)))
+	    dict_add_word (pattern_enumerate_answers, pattern_enumerate_word);
+	return;
+    }
+
+    last = strlen (pattern_enumerate_word);
+
+    if (c == '?' || c == '_') {
+	for (c = 'a'; c <= 'z'; c++) {
+	    pattern_enumerate_word[last] = c;
+	    pattern_enumerate (pattern_chunk + 1, dict_cursor_next (cursor, c));
+	}
+    } else {
+	pattern_enumerate_word[last] = c;
+	pattern_enumerate (pattern_chunk + 1, dict_cursor_next (cursor, c));
+    }
+
+    pattern_enumerate_word[last] = '\0';
+}
+
+static void
+pattern_expand (const char *pattern, dict_t *dict, dict_t *answers)
+{
+    memset (pattern_enumerate_word, '\0', WORD_GAME_MAX_WORD_LENGTH);
+    pattern_enumerate_answers = answers;
+
+    pattern_enumerate (pattern, dict_root (dict));
+}
+
+int
+main (void)
+{
+    int i, p, puzzle[52];
+    char puzzle_string[3];
+    dict_t dict, solution;
+    struct timeval tv;
+
+    gettimeofday (&tv, NULL);
+    srand (tv.tv_sec ^ tv.tv_usec);
+
+    for (i = 0; i < 52; i++)
+	puzzle[i] = i;
+    shuffle (puzzle, 52);
+
+    dict_init (&dict);
+    dict_add_words_from_file (&dict, "words.txt");
+
+    puzzle_string[2] = '\0';
+
+    for (i = 0; i < 52; i++) {
+	p = puzzle[i];
+	if (p < 26) {
+	    puzzle_string[0] = 'a' + p;
+	    puzzle_string[1] = '?';
+	} else {
+	    puzzle_string[0] = '?';
+	    puzzle_string[1] = 'a' + (p - 26);
+	}
+	dict_init (&solution);
+	pattern_expand (puzzle_string, &dict, &solution);
+
+	word_game_play (puzzle_string, &dict, &solution, 0);
+
+	dict_fini (&solution);
+    }
+
+    dict_fini (&dict);
+
+    return 0;
+}
-- 
2.43.0