1 files changed, 106 insertions, 0 deletions
diff --git a/src/iterator.c b/src/iterator.c
new file mode 100644
index 000000000000..b5930f089bb2
--- /dev/null
+++ b/src/iterator.c
@@ -0,0 +1,106 @@
+/* Provides an Iterator for keyword characters.
+   Copyright (C) 1989 Free Software Foundation, Inc.
+   written by Douglas C. Schmidt (schmidt@ics.uci.edu)
+
+This file is part of GNU GPERF.
+
+GNU GPERF 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 1, or (at your option)
+any later version.
+
+GNU GPERF 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 GNU GPERF; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <stdio.h>
+#include <ctype.h>
+#include "iterator.h"
+
+/* Locally visible ITERATOR object. */
+
+ITERATOR iterator;
+
+/* Constructor for ITERATOR. */
+
+void
+iterator_init (s, lo, hi, word_end, bad_val, key_end)
+     char *s;
+     int lo;
+     int hi;
+     int word_end;
+     int bad_val;
+     int key_end;
+{
+  iterator.end         = key_end;
+  iterator.error_value = bad_val;
+  iterator.end_word    = word_end;
+  iterator.str         = s;
+  iterator.hi_bound    = hi;
+  iterator.lo_bound    = lo;
+}
+
+/* Define several useful macros to clarify subsequent code. */
+#define ISPOSDIGIT(X) ((X)<='9'&&(X)>'0')
+#define TODIGIT(X) ((X)-'0')
+
+/* Provide an Iterator, returning the ``next'' value from 
+   the list of valid values given in the constructor. */
+
+int 
+next ()
+{ 
+/* Variables to record the Iterator's status when handling ranges, e.g., 3-12. */
+
+  static int size;              
+  static int curr_value;           
+  static int upper_bound;
+
+  if (size) 
+    { 
+      if (++curr_value >= upper_bound) 
+        size = 0;    
+      return curr_value; 
+    }
+  else 
+    {
+      while (*iterator.str) 
+        {
+          if (*iterator.str == ',') 
+            iterator.str++;
+          else if (*iterator.str == '$') 
+            {
+              iterator.str++;
+              return iterator.end_word;
+            }
+          else if (ISPOSDIGIT (*iterator.str))
+            {
+
+              for (curr_value = 0; isdigit (*iterator.str); iterator.str++) 
+                curr_value = curr_value * 10 + *iterator.str - '0';
+
+              if (*iterator.str == '-') 
+                {
+
+                  for (size = 1, upper_bound = 0; 
+                       isdigit (*++iterator.str); 
+                       upper_bound = upper_bound * 10 + *iterator.str - '0');
+
+                  if (upper_bound <= curr_value || upper_bound > iterator.hi_bound) 
+                    return iterator.error_value;
+                }
+              return curr_value >= iterator.lo_bound && curr_value <= iterator.hi_bound 
+                ? curr_value : iterator.error_value;
+            }
+          else
+            return iterator.error_value;               
+        }
+
+      return iterator.end;
+    }
+}