kc3-lang/libxkbcommon/src/utils.c

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• Hash : e4bceec8
  Author :
  Date : 2013-03-14T14:33:40
  

  utils: add {un,}map_file to read an entire file This wraps the current mmap call and adds a fallback implementation for systems which do not have mmap (e.g. mingw). Signed-off-by: Ran Benita <ran234@gmail.com>

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• src/utils.c

• /*
   * Copyright © 2013 Ran Benita <ran234@gmail.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  
  #include "utils.h"
  
  #ifdef HAVE_MMAP
  
  #include <fcntl.h>
  #include <unistd.h>
  #include <sys/mman.h>
  #include <sys/stat.h>
  #include <sys/types.h>
  
  bool
  map_file(FILE *file, const char **string_out, size_t *size_out)
  {
      struct stat stat_buf;
      const int fd = fileno(file);
      char *string;
  
      /* Make sure to keep the errno on failure! */
  
      if (fstat(fd, &stat_buf) != 0)
          return false;
  
      string = mmap(NULL, stat_buf.st_size, PROT_READ, MAP_SHARED, fd, 0);
      if (string == MAP_FAILED)
          return false;
  
      *string_out = string;
      *size_out = stat_buf.st_size;
      return true;
  }
  
  void
  unmap_file(const char *str, size_t size)
  {
      munmap(UNCONSTIFY(str), size);
  }
  
  #else
  
  bool
  map_file(FILE *file, const char **string_out, size_t *size_out)
  {
      long ret;
      size_t ret_s;
      char *string;
      size_t size;
  
      /* Make sure to keep the errno on failure! */
  
      ret = fseek(file, 0, SEEK_END);
      if (ret != 0)
          return false;
  
      ret = ftell(file);
      if (ret < 0)
          return false;
      size = (size_t) ret;
  
      ret = fseek(file, 0, SEEK_SET);
      if (ret < 0)
          return false;
  
      string = malloc(size);
      if (!string)
          return false;
  
      ret_s = fread(string, 1, size, file);
      if (ret_s < size) {
          free(string);
          return false;
      }
  
      *string_out = string;
      *size_out = size;
      return true;
  }
  
  void
  unmap_file(const char *str, size_t size)
  {
      free(UNCONSTIFY(str));
  }
  
  #endif
  

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