BSD 4_3_Net_2 development

Work on file usr/src/lib/libg++/grot/gperf/src/list-node.cc

Synthesized-from: CSRG/cd2/net.2

diff --git a/usr/src/lib/libg++/grot/gperf/src/list-node.cc b/usr/src/lib/libg++/grot/gperf/src/list-node.cc
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+++ b/usr/src/lib/libg++/grot/gperf/src/list-node.cc
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+/* Creates and initializes a new list node.
+   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 <std.h>
+#include "options.h"
+#include "list-node.h"
+#include "trace.h"
+
+/* Sorts the key set alphabetically to speed up subsequent operations.
+   Uses insertion sort since the set is probably quite small. */
+
+static inline void 
+List_Node::set_sort (char *base, int len)
+{
+  T (Trace t ("List_Node::set_sort");)
+  int i, j;
+
+  for (i = 0, j = len - 1; i < j; i++)
+    {
+      char curr, tmp;
+      
+      for (curr = i + 1, tmp = base[curr]; curr > 0 && tmp < base[curr-1]; curr--)
+        base[curr] = base[curr - 1];
+
+      base[curr] = tmp;
+
+    }
+}
+
+/* Initializes a List_Node.  This requires obtaining memory for the CHAR_SET
+   initializing them using the information stored in the KEY_POSITIONS array in Options,
+   and checking for simple errors.  It's important to note that KEY and REST are
+   both pointers to the different offsets into the same block of dynamic memory pointed 
+   to by parameter K. The data member REST is used to store any additional fields 
+   of the input file (it is set to the "" string if Option[TYPE] is not enabled).
+   This is useful if the user wishes to incorporate a lookup structure,
+   rather than just an array of keys.  Finally, KEY_NUMBER contains a count
+   of the total number of keys seen so far.  This is used to initialize
+   the INDEX field to some useful value. */
+
+List_Node::List_Node (char *k, int len): key (k), next (0), index (0),
+     length (len), link (0), rest (option[TYPE] ? k + len + 1 : "")
+{
+  T (Trace t ("List_Node::List_Node");)
+  char *ptr = new char[(option[ALLCHARS] ? len : option.get_max_keysig_size ()) + 1];
+  char_set  = ptr;
+  k[len]    = '\0';             /* Null terminate KEY to separate it from REST. */
+  
+  if (option[ALLCHARS])         /* Use all the character position in the KEY. */
+    for (; *k; k++, ptr++)
+      ++occurrences[*ptr = *k];
+  else                          /* Only use those character positions specified by the user. */
+    {                           
+      int i;
+      
+      /* Iterate thru the list of key_positions, initializing occurrences table
+        and char_set (via char * pointer ptr). */
+      
+      for (option.reset (); (i = option.get ()) != EOS; )
+        {
+          if (i == WORD_END)            /* Special notation for last KEY position, i.e. '$'. */
+            *ptr = key[len - 1];
+          else if (i <= len)    /* Within range of KEY length, so we'll keep it. */
+            *ptr = key[i - 1];
+          else                  /* Out of range of KEY length, so we'll just skip it. */
+            continue;
+          ++occurrences[*ptr++];
+        }
+      
+      /* Didn't get any hits and user doesn't want to consider the
+        keylength, so there are essentially no usable hash positions! */
+      if (ptr == char_set && option[NOLENGTH])
+        report_error ("Can't hash keyword %s with chosen key positions.\n%a", key, 1);
+    }
+  *ptr = '\0';                  /* Terminate this bastard.... */
+  /* Sort the KEY_SET items alphabetically. */
+  set_sort (char_set, ptr - char_set);
+}