LXR uboot/lib/efi_loader/efi

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * String functions
   4 *
   5 * Copyright (c) 2020 AKASHI Takahiro, Linaro Limited
   6 */
   7
   8#include <common.h>
   9#include <charset.h>
  10#include <efi_loader.h>
  11
  12/**
  13 * efi_create_indexed_name - create a string name with an index
  14 * @buffer:     Buffer
  15 * @name:       Name string
  16 * @index:      Index
  17 *
  18 * Create a utf-16 string with @name, appending @index.
  19 * For example, L"Capsule0001"
  20 *
  21 * The caller must ensure that the buffer has enough space for the resulting
  22 * string including the trailing L'\0'.
  23 *
  24 * Return: A pointer to the next position after the created string
  25 *         in @buffer, or NULL otherwise
  26 */
  27u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
  28                             unsigned int index)
  29{
  30        u16 *p = buffer;
  31        char index_buf[5];
  32        size_t size;
  33
  34        size = (utf8_utf16_strlen(name) * sizeof(u16) +
  35                sizeof(index_buf) * sizeof(u16));
  36        if (buffer_size < size)
  37                return NULL;
  38        utf8_utf16_strcpy(&p, name);
  39        snprintf(index_buf, sizeof(index_buf), "%04X", index);
  40        utf8_utf16_strcpy(&p, index_buf);
  41
  42        return p;
  43}
  44