# HG changeset patch
# User tuomov
# Date 1087596283 -7200
# Node ID 401322031c7ee748726e7b2186c4b3b6c439a5aa
# Parent  7e69e5f7a0138c5a495acfbcec05d25f457adcc9
trunk: changeset 1574
Added routines for storing commonly used strings and referring to them
by keys.

diff -r 7e69e5f7a013 -r 401322031c7e Makefile
--- a/Makefile	Sun May 02 17:14:06 2004 +0200
+++ b/Makefile	Sat Jun 19 00:04:43 2004 +0200
@@ -11,7 +11,8 @@
 CFLAGS += $(C89_SOURCE) $(POSIX_SOURCE) 
 
 SOURCES=misc.c output.c util.c optparser.c parser.c tokenizer.c \
-        map.c obj.c objlist.c errorlog.c symlist.c rb.c
+        map.c obj.c objlist.c errorlog.c symlist.c rb.c \
+        stringstore.c
 
 ifdef LIBTU_NO_ERRMSG
 DEFINES += -DLIBTU_NO_ERRMSG
diff -r 7e69e5f7a013 -r 401322031c7e rb.h
--- a/rb.h	Sun May 02 17:14:06 2004 +0200
+++ b/rb.h	Sat Jun 19 00:04:43 2004 +0200
@@ -66,6 +66,7 @@
     struct rb_node *lext;
   } k;
   union {
+    int ival;
     void *val;
     struct rb_node *rext;
   } v;
diff -r 7e69e5f7a013 -r 401322031c7e stringstore.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stringstore.c	Sat Jun 19 00:04:43 2004 +0200
@@ -0,0 +1,92 @@
+/*
+ * libtu/stringstore.c
+ *
+ * Copyright (c) Tuomo Valkonen 2004. 
+ *
+ * You may distribute and modify this library under the terms of either
+ * the Clarified Artistic License or the GNU LGPL, version 2.1 or later.
+ */
+
+#include <stdlib.h>
+
+#include "misc.h"
+#include "output.h"
+#include "rb.h"
+#include "stringstore.h"
+
+
+static Rb_node stringstore=NULL;
+
+    
+StringId stringstore_find(const char *str)
+{
+    Rb_node node;
+    int found=0;
+    
+    if(stringstore==NULL)
+        return STRINGID_NONE;
+    
+    node=rb_find_key_n(stringstore, str, &found);
+    
+    if(!found)
+        return STRINGID_NONE;
+    
+    return (StringId)node;
+}
+
+
+StringId stringstore_alloc(const char *str)
+{
+    Rb_node node=(Rb_node)stringstore_find(str);
+    char *s;
+    
+    if(node!=NULL){
+        node->v.ival++;
+        return node;
+    }
+    
+    if(stringstore==NULL){
+        stringstore=make_rb();
+        if(stringstore==NULL)
+            return STRINGID_NONE;
+    }
+    
+    s=scopy(str);
+    
+    if(s==NULL)
+        return STRINGID_NONE;
+    
+    node=rb_insert(stringstore, s, NULL);
+    
+    if(node==NULL)
+        return STRINGID_NONE;
+    
+    node->v.ival=1;
+        
+    return (StringId)node;
+}
+
+
+void stringstore_free(StringId id)
+{
+    Rb_node node=(Rb_node)id;
+    
+    if(node==NULL){
+        warn("Attempt to free un-allocated string from stringstore.");
+        return;
+    }
+    
+    if(node->v.ival<=0){
+        warn("Stringstore reference count corrupted.");
+        return;
+    }
+    
+    node->v.ival--;
+    
+    if(node->v.ival==0){
+        char *s=(char*)(node->k.key);
+        rb_delete_node(node);
+        free(s);
+    }
+}
+
diff -r 7e69e5f7a013 -r 401322031c7e stringstore.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stringstore.h	Sat Jun 19 00:04:43 2004 +0200
@@ -0,0 +1,21 @@
+/*
+ * libtu/stringstore.h
+ *
+ * Copyright (c) Tuomo Valkonen 2004. 
+ *
+ * You may distribute and modify this library under the terms of either
+ * the Clarified Artistic License or the GNU LGPL, version 2.1 or later.
+ */
+
+#ifndef LIBTU_STRINGSTORE_H
+#define LIBTU_STRINGSTORE_H
+
+typedef void* StringId;
+
+#define STRINGID_NONE ((StringId)0)
+
+extern StringId stringstore_find(const char *str);
+extern StringId stringstore_alloc(const char *str);
+extern void stringstore_free(StringId id);
+
+#endif /* LIBTU_STRINGSTORE_H */