text: /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "w32_buffer.h"
  
  #include "../buffer.h"
  #include "utf-conv.h"
  
  GIT_INLINE(int) handle_wc_error(void)
  {
  	if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
  		errno = ENAMETOOLONG;
  	else
  		errno = EINVAL;
  
  	return -1;
  }
  
  int git_buf_put_w(git_buf *buf, const wchar_t *string_w, size_t len_w)
  {
  	int utf8_len, utf8_write_len;
  	size_t new_size;
  
  	if (!len_w) {
  		return 0;
  	} else if (len_w > INT_MAX) {
  		git_error_set_oom();
  		return -1;
  	}
  
  	assert(string_w);
  
  	/* Measure the string necessary for conversion */
  	if ((utf8_len = WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, string_w, (int)len_w, NULL, 0, NULL, NULL)) == 0)
  		return 0;
  
  	assert(utf8_len > 0);
  
  	GIT_ERROR_CHECK_ALLOC_ADD(&new_size, buf->size, (size_t)utf8_len);
  	GIT_ERROR_CHECK_ALLOC_ADD(&new_size, new_size, 1);
  
  	if (git_buf_grow(buf, new_size) < 0)
  		return -1;
  
  	if ((utf8_write_len = WideCharToMultiByte(
  			CP_UTF8, WC_ERR_INVALID_CHARS, string_w, (int)len_w, &buf->ptr[buf->size], utf8_len, NULL, NULL)) == 0)
  		return handle_wc_error();
  
  	assert(utf8_write_len == utf8_len);
  
  	buf->size += utf8_write_len;
  	buf->ptr[buf->size] = '\0';
  	return 0;
  }
  