1 files changed, 132 insertions, 0 deletions
diff --git a/amend/symtab.c b/amend/symtab.c
new file mode 100644
index 0000000..835d2fc
--- /dev/null
+++ b/amend/symtab.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "symtab.h"
+
+#define DEFAULT_TABLE_SIZE 16
+
+typedef struct {
+    char *symbol;
+    const void *cookie;
+    unsigned int flags;
+} SymbolTableEntry;
+
+struct SymbolTable {
+    SymbolTableEntry *table;
+    int numEntries;
+    int maxSize;
+};
+
+SymbolTable *
+createSymbolTable()
+{
+    SymbolTable *tab;
+
+    tab = (SymbolTable *)malloc(sizeof(SymbolTable));
+    if (tab != NULL) {
+        tab->numEntries = 0;
+        tab->maxSize = DEFAULT_TABLE_SIZE;
+        tab->table = (SymbolTableEntry *)malloc(
+                            tab->maxSize * sizeof(SymbolTableEntry));
+        if (tab->table == NULL) {
+            free(tab);
+            tab = NULL;
+        }
+    }
+    return tab;
+}
+
+void
+deleteSymbolTable(SymbolTable *tab)
+{
+    if (tab != NULL) {
+        while (tab->numEntries > 0) {
+            free(tab->table[--tab->numEntries].symbol);
+        }
+        free(tab->table);
+    }
+}
+
+void *
+findInSymbolTable(SymbolTable *tab, const char *symbol, unsigned int flags)
+{
+    int i;
+
+    if (tab == NULL || symbol == NULL) {
+        return NULL;
+    }
+
+    // TODO: Sort the table and binary search
+    for (i = 0; i < tab->numEntries; i++) {
+        if (strcmp(tab->table[i].symbol, symbol) == 0 &&
+                tab->table[i].flags == flags)
+        {
+            return (void *)tab->table[i].cookie;
+        }
+    }
+
+    return NULL;
+}
+
+int
+addToSymbolTable(SymbolTable *tab, const char *symbol, unsigned int flags,
+        const void *cookie)
+{
+    if (tab == NULL || symbol == NULL || cookie == NULL) {
+        return -1;
+    }
+
+    /* Make sure that this symbol isn't already in the table.
+     */
+    if (findInSymbolTable(tab, symbol, flags) != NULL) {
+        return -2;
+    }
+
+    /* Make sure there's enough space for the new entry.
+     */
+    if (tab->numEntries == tab->maxSize) {
+        SymbolTableEntry *newTable;
+        int newSize;
+
+        newSize = tab->numEntries * 2;
+        if (newSize < DEFAULT_TABLE_SIZE) {
+            newSize = DEFAULT_TABLE_SIZE;
+        }
+        newTable = (SymbolTableEntry *)realloc(tab->table,
+                            newSize * sizeof(SymbolTableEntry));
+        if (newTable == NULL) {
+            return -1;
+        }
+        tab->maxSize = newSize;
+        tab->table = newTable;
+    }
+
+    /* Insert the new entry.
+     */
+    symbol = strdup(symbol);
+    if (symbol == NULL) {
+        return -1;
+    }
+    // TODO: Sort the table
+    tab->table[tab->numEntries].symbol = (char *)symbol;
+    tab->table[tab->numEntries].cookie = cookie;
+    tab->table[tab->numEntries].flags = flags;
+    tab->numEntries++;
+
+    return 0;
+}