auto import from //depot/cupcake/@135843

tools/apriori/hash.c

@@ -0,0 +1,27 @@
+#include <common.h>
+#include <debug.h>
+#include <libelf.h>
+#include <hash.h>
+#include <string.h>
+
+int hash_lookup(Elf *elf, 
+                Elf_Data *hash,
+                Elf_Data *symtab,
+                Elf_Data *symstr,
+                const char *symname) {
+    Elf32_Word *hash_data = (Elf32_Word *)hash->d_buf;
+    Elf32_Word index;
+    Elf32_Word nbuckets = *hash_data++;
+    Elf32_Word *buckets = ++hash_data;
+    Elf32_Word *chains  = hash_data + nbuckets;
+
+    index = buckets[elf_hash(symname) % nbuckets];
+    while (index != STN_UNDEF &&
+           strcmp((char *)symstr->d_buf + 
+                  ((Elf32_Sym *)symtab->d_buf)[index].st_name,
+                  symname)) {
+        index = chains[index];
+    }
+
+    return index;
+}