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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@1030 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Tools/WAD/Wad/string.c

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+/* ----------------------------------------------------------------------------- 
+ * string.c
+ *
+ *    This file provides support for string storage in WAD.  Since strings are
+ *    used frequently in WAD, this file implements string interning and
+ *    some lookup functions that can be used to return a previously stored
+ *    string rather than making a new copy.
+ * 
+ * Author(s) : David Beazley (beazley@cs.uchicago.edu)
+ *
+ * Copyright (C) 2000.  The University of Chicago
+ * See the file LICENSE for information on usage and redistribution.	
+ * ----------------------------------------------------------------------------- */
+
+#include "wad.h"
+
+
+/* Hash table containing stab strings and such */
+typedef struct stringtype {
+  char             *str;
+  struct stringtype *next;
+} stringtype;
+
+#define STRING_HASH_SIZE  1013
+
+static stringtype *strings[STRING_HASH_SIZE];
+static int         strings_init = 0;
+
+static int shash(char *name) {
+  unsigned int h = 0;
+  char *c;
+  int i;
+  c = name;
+  for (i = 0; (i < 16) && (*c); i++, c++) {
+    h = ((h^~i) << 6) + *c;
+  }
+  return h % STRING_HASH_SIZE;
+}
+
+char *
+wad_string_lookup(char *s) {
+  int h;
+  int i;
+  stringtype *st;
+
+  if (!strings_init) {
+    for (i = 0; i < STRING_HASH_SIZE; i++) {
+      strings[i] = 0;
+    }
+    strings_init = 1;
+  }
+  
+  h = shash(s);
+  st = strings[h];
+  while (st) {
+    if (strcmp(st->str,s) == 0) return st->str;
+    st = st->next;
+  }
+  
+  /* Not found. Add the string to the hash table */
+  st = (stringtype *) wad_malloc(sizeof(stringtype));
+  st->str = wad_strdup(s);
+  st->next = strings[h];
+  strings[h] = st;
+  return st->str;
+}
+
+void wad_string_debug() {
+  if (wad_debug_mode & DEBUG_STRING) {
+    int maxdepth = 0;
+    int total = 0;
+    int stringlen = 0;
+    int i;
+
+    for (i = 0; i < STRING_HASH_SIZE; i++) {
+      stringtype *s;
+      int c = 0;
+      s = strings[i];
+      while (s) {
+	c++;
+	stringlen += strlen(s->str);
+	s = s->next;
+      }
+      /*      wad_printf("WAD: stringhash[%d] = %d\n", i, c);*/
+      if (c > maxdepth) maxdepth = c;
+      total += c;
+    }
+    wad_printf("WAD: nstrings = %d (%d bytes)\n", total, stringlen + total*sizeof(stringtype));
+    wad_printf("WAD: maxdepth = %d\n", maxdepth);
+    }
+}
+
+