Added missing letters mode.

1 files changed, 20 insertions, 7 deletions

diff --git a/codeword.c b/codeword.c
index 38f8c87..fc68f3a 100644
--- a/codeword.c
+++ b/codeword.c
@@ -24,9 +24,16 @@
 #include <errno.h>
 #include <ctype.h>
 
+typedef enum
+{
+    eLetter,
+    eNumber,
+    eMissing
+} CharacterClass;
+
 typedef struct
 {
-    int is_letter;
+    CharacterClass type;
     int number;
     char letter;
 } Character;
@@ -59,7 +66,7 @@ static int ContainsLetter(char c, const Character *chars, int no_chars)
 
     for(f=0; f < no_chars; f++)
     {
-    	if (chars[f].is_letter && chars[f].letter == c)
+    	if (chars[f].type == eLetter && chars[f].letter == c)
 	{
 	    return 1;
 	}
@@ -82,7 +89,7 @@ static int CheckLettersAndLength(const char *buff,
 
     for(f=0; f < no_chars; f++)
     {
-    	if (chars[f].is_letter &&
+    	if (chars[f].type == eLetter &&
 	    (chars[f].letter != buff[f]))
 	{
 	    return 0;
@@ -100,7 +107,7 @@ static int CheckNumbers(const char *buff, const Character *chars, int no_chars)
 
     for(f = 0; f < no_chars; f++)
     {
-    	if (!chars[f].is_letter)
+    	if (chars[f].type == eNumber)
 	{
 	    int i = chars[f].number - 1;
 
@@ -139,7 +146,8 @@ int main(int argc, char *argv[])
 
     if (argc < 3)
     {
-    	fprintf(stderr, "usage: %s wordlist <letter or number> ...\n", argv[0]);
+    	fprintf(stderr, "usage: %s wordlist <letter, number or period> ...\n",
+				argv[0]);
 	exit(EXIT_FAILURE);
     }
 
@@ -159,13 +167,18 @@ int main(int argc, char *argv[])
 
 	if (i < 1 || i > 27)
 	{
-	    chars[f].is_letter = 1;
+	    chars[f].type = eLetter;
 	    chars[f].letter = tolower((unsigned char)argv[f+2][0]);
 	    chars[f].number = 0;
+
+	    if (chars[f].letter == '.')
+	    {
+	    	chars[f].type = eMissing;
+	    }
 	}
 	else
 	{
-	    chars[f].is_letter = 0;
+	    chars[f].type = eNumber;
 	    chars[f].number = i;
 	    chars[f].letter = 0;
 	}