Merge a16fde8070 into 6f4b3b7cd8

```
src/libfastcommon.a(hash.o): relocation R_X86_64_32 against `.data' can not be used when making a shared object; recompile with -fPIC
```

env: Ubuntu 14.04, gcc 4.8

src/Makefile.in

@@ -66,7 +66,7 @@ libfastcommon.a: $(FAST_STATIC_OBJS)
 .c:
 	$(COMPILE) -o $@ $<  $(FAST_STATIC_OBJS) $(LIB_PATH) $(INC_PATH)
 .c.o:
-	$(COMPILE) -c -o $@ $<  $(INC_PATH)
+	$(COMPILE) -c -fPIC -o $@ $<  $(INC_PATH)
 .c.lo:
 	$(COMPILE) -c -fPIC -o $@ $<  $(INC_PATH)
 install:

src/array_allocator.c

@@ -47,7 +47,7 @@ int array_allocator_init_ex(ArrayAllocatorContext *ctx,
         start = end;
     }
 
-    fc_combine_two_string(name_prefix, "array", '-', name);
+    fc_combine_two_strings(name_prefix, "array", '-', name);
     return fast_allocator_init_ex(&ctx->allocator, name,
             obj_size, NULL, regions, region - regions, 0,
             0.9999, reclaim_interval, need_lock);

src/fast_task_queue.c

@@ -142,7 +142,7 @@ int free_queue_init_ex2(struct fast_task_queue *queue, const char *name,
         (int64_t)max_data_size);
         */
 
-    fc_combine_two_string(name, "task", '-', aname);
+    fc_combine_two_strings(name, "task", '-', aname);
 	return fast_mblock_init_ex1(&queue->allocator, aname,
             queue->block_size, alloc_once, max_connections,
             (fast_mblock_object_init_func)task_alloc_init,

src/ini_file_reader.c

@@ -912,7 +912,7 @@ static int iniAddAnnotation(char *params)
         return EFAULT;
     }
 
-    fc_combine_two_string(func_name, "init_annotation", '_', symbol);
+    fc_combine_two_strings(func_name, "init_annotation", '_', symbol);
     init_func = dlsym(dlhandle, symbol);
     if (init_func == NULL)
     {

src/logger.c

@@ -385,7 +385,7 @@ static int log_delete_old_file(LogContext *pContext,
     char full_filename[MAX_PATH_SIZE + 128];
     if (NEED_COMPRESS_LOG(pContext->compress_log_flags))
     {
-        fc_concat_two_string(old_filename, GZIP_EXT_NAME_STR, full_filename);
+        fc_concat_two_strings(old_filename, GZIP_EXT_NAME_STR, full_filename);
     }
     else
     {
@@ -652,7 +652,7 @@ static int log_delete_matched_old_files(LogContext *pContext,
     log_get_file_path(pContext, log_filepath);
     for (i=0; i<filename_array.count; i++)
     {
-        fc_concat_two_string(log_filepath, filename_array.
+        fc_concat_two_strings(log_filepath, filename_array.
                 filenames[i], full_filename);
         if (unlink(full_filename) != 0)
         {
@@ -765,9 +765,9 @@ static void *log_gzip_func(void *args)
         }
 
         gzip_cmd_filename = get_gzip_command_filename();
-        fc_concat_two_string(log_filepath, filename_array.
+        fc_concat_two_strings(log_filepath, filename_array.
                 filenames[i], full_filename);
-        fc_combine_two_string(gzip_cmd_filename, full_filename, ' ', cmd);
+        fc_combine_two_strings(gzip_cmd_filename, full_filename, ' ', cmd);
         result = getExecResult(cmd, output, sizeof(output));
         if (result != 0)
         {

src/shared_func.c

@@ -1460,7 +1460,7 @@ int safeWriteToFile(const char *filename, const char *buff,
 	char tmpFilename[PATH_MAX];
 	int result;
 
-    fc_combine_two_string(filename, "tmp", '.', tmpFilename);
+    fc_combine_two_strings(filename, "tmp", '.', tmpFilename);
 	if ((result=writeToFile(tmpFilename, buff, file_size)) != 0)
 	{
 		return result;

src/shared_func.h

@@ -1288,7 +1288,7 @@ static inline int resolve_path(const char *from, const char *filename,
             size, NORMALIZE_FLAGS_URL_ENABLED_AND_APPEND_PARAMS);
 }
 
-static inline int fc_combine_two_string_ex(
+static inline int fc_combine_two_strings_ex(
         const char *first_str, const int first_len,
         const char *second_str, const int second_len,
         const char seperator, char *combined_str, const int size)
@@ -1311,16 +1311,16 @@ static inline int fc_combine_two_string_ex(
     return p - combined_str;
 }
 
-#define fc_combine_two_string_s(first, second, seperator, combined, size)  \
-    fc_combine_two_string_ex(first, strlen(first), second, strlen(second), \
+#define fc_combine_two_strings_s(first, second, seperator, combined, size)  \
+    fc_combine_two_strings_ex(first, strlen(first), second, strlen(second), \
             seperator, combined, size)
 
-#define fc_combine_two_string(first, second, seperator, combined) \
-    fc_combine_two_string_s(first, second, seperator,   \
+#define fc_combine_two_strings(first, second, seperator, combined) \
+    fc_combine_two_strings_s(first, second, seperator,   \
             combined, sizeof(combined))
 
-#define fc_concat_two_string(first, second, combined)   \
-    fc_combine_two_string(first, second, '\0', combined)
+#define fc_concat_two_strings(first, second, combined)   \
+    fc_combine_two_strings(first, second, '\0', combined)
 
 static inline int fc_get_full_filename_ex(
         const char *base_path_str, const int base_path_len,
@@ -1328,7 +1328,7 @@ static inline int fc_get_full_filename_ex(
         char *full_filename, const int size)
 {
     const char seperator = '/';
-    return fc_combine_two_string_ex(base_path_str, base_path_len,
+    return fc_combine_two_strings_ex(base_path_str, base_path_len,
             filename_str, filename_len, seperator, full_filename, size);
 }
 
@@ -1354,6 +1354,30 @@ static inline int fc_get_full_filename_ex(
 #define fc_combine_full_filepath(base_path, filepath, full_filename) \
     fc_combine_full_filename(base_path, filepath, full_filename)
 
+static inline int fc_get_hex_subdir_filepath(const char *base_path,
+        const int base_len, const int subdir_index, char *file_path)
+{
+    const int padding_len = 2;
+    char *p;
+
+    memcpy(file_path, base_path, base_len);
+    p = file_path + base_len;
+    *p++ = '/';
+    if (subdir_index <= UINT8_MAX) {
+        *p++ = g_upper_hex_chars[(subdir_index >> 4) & 0x0F];
+        *p++ = g_upper_hex_chars[subdir_index & 0x0F];
+        *p = '\0';
+    } else {
+        if (subdir_index <= UINT16_MAX) {
+            p += short2HEX(subdir_index, p, padding_len);
+        } else {
+            p += int2HEX(subdir_index, p, padding_len);
+        }
+    }
+
+    return p - file_path;
+}
+
 /** get gzip command full filename
  *  return: the gzip command full filename
 */