From 50f21014e56920997dcd0c09b8320f9762eebe8f Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Mon, 19 Sep 2016 09:46:34 +0000
Subject: Added new string:number format to help with non-character code
 following mappings.

---
 Makefile    |  2 +-
 README      | 15 ++++++++++-----
 ascii2map.c | 53 +++++++++++++++++++++++++++++++++++++++++++----------
 example     |  3 ++-
 4 files changed, 56 insertions(+), 17 deletions(-)

diff --git a/Makefile b/Makefile
index 490d266..b37e046 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 ascii2map: ascii2map.c
-	$(CC) -o ascii2map ascii2map.c
+	$(CC) -g -o ascii2map ascii2map.c
 
 clean:
 	rm -f ascii2map
diff --git a/README b/README
index 05582aa..a53c089 100644
--- a/README
+++ b/README
@@ -24,11 +24,12 @@ Input files look like the following:
 #:1
 *:128
 !63
+0123456789ABCDEF:2
 ~
 ########
 #      #
 #ABCDEF#
-#1# # *#
+#0#1# *#
 ########
 
 The "#:1" line defines that when a '#' character appears in the map then code
@@ -40,14 +41,18 @@ character code.  In ASCII this would mean 'A' becomes 2, 'B' becomes 3, and so
 on.  Any codes generated that fall outside the range 0 to 255 will be clamped
 to that range.
 
-The line with a tilde (~) on its own indicates the end of the definitions.  By
-default, unless redefined, space is automatically defined to be code zero.
+A line with a long_string:number overrides a line starting with '!' and means
+that each character in the string will be defined as the zero-based index in
+the string added to the trailing number.  This is useful if your tile mappings
+use characters in a non-standard order.
+
+The line with a tilde (~) on its own indicates the end of the definitions.  
 
 Following it is the map to produce the definition for, eg.
 
 $ ascii2map example
 	byte	1, 1, 1, 1, 1, 1, 1, 1
 	byte	1, 0, 0, 0, 0, 0, 0, 1
-	byte	1, 2, 3, 4, 5, 6, 7, 1
-	byte	1, 0, 1, 0, 1, 0, 128, 1
+	byte	1, 12, 13, 14, 15, 16, 17, 1
+	byte	1, 2, 1, 3, 1, 0, 128, 1
 	byte	1, 1, 1, 1, 1, 1, 1, 1
diff --git a/ascii2map.c b/ascii2map.c
index ce6347e..2f6cd97 100644
--- a/ascii2map.c
+++ b/ascii2map.c
@@ -55,6 +55,7 @@ typedef enum
 /* ---------------------------------------- GLOBALS
 */
 static int              code_point = 'A';
+static char             code_string[256] = {0};
 static uchar            point[256];
 static uchar            used[256];
 static const char       *directive = "byte";
@@ -107,7 +108,23 @@ static void EndOutput(FILE *fp)
 
 static unsigned CodePoint(char c)
 {
-    int offset = c - code_point;
+    int offset;
+
+    if (code_string[0])
+    {
+        char *p = strchr(code_string, c);
+
+        if (p)
+        {
+            c = p - code_string;
+        }
+
+        offset = c + code_point;
+    }
+    else
+    {
+        offset = c - code_point;
+    }
 
     if (offset < 0)
     {
@@ -354,19 +371,35 @@ int main(int argc, char *argv[])
             {
                 code_point = atoi(line + 1);
             }
-
-            if (line[0] && line[1] == ':' && line[2])
+            else
             {
-                char c;
-                int i;
+                if (line[0] && line[1] && line[1] != ':')
+                {
+                    char *p = strrchr(line, ':');
 
-                c = line[0];
-                i = atoi(line + 2);
+                    if (p)
+                    {
+                        *p++ = 0;
+                        code_point = atoi(p);
 
-                if (c >= 0 && c <= 255)
+                        strncpy(code_string, line, sizeof code_string);
+                        code_string[(sizeof code_string) - 1] = 0;
+                    }
+                }
+
+                if (line[0] && line[1] == ':' && line[2])
                 {
-                    point[c] = i;
-                    used[c] = 1;
+                    char c;
+                    int i;
+
+                    c = line[0];
+                    i = atoi(line + 2);
+
+                    if (c >= 0 && c <= 255)
+                    {
+                        point[c] = i;
+                        used[c] = 1;
+                    }
                 }
             }
         }
diff --git a/example b/example
index 329c0b6..beefdbd 100644
--- a/example
+++ b/example
@@ -1,9 +1,10 @@
 #:1
 *:128
 !63
+0123456789ABCDEF:2
 ~
 ########
 #      #
 #ABCDEF#
-#1# # *#
+#0#1# *#
 ########
-- 
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