grealpath.h

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/*
    This file is part of darktable,
    Copyright (C) 2013-2014, 2016 Tobias Ellinghaus.
    Copyright (C) 2014 Roman Lebedev.
    Copyright (C) 2020 Andreas Schneider.
    Copyright (C) 2020 David-Tillmann Schaefer.
    Copyright (C) 2021 Pascal Obry.
    Copyright (C) 2022 Martin Bařinka.
    
    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    darktable is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
/*
 This code is taken from http://git.gnome.org/browse/gobject-introspection/tree/giscanner/grealpath.h .
 According to http://git.gnome.org/browse/gobject-introspection/tree/COPYING it's licensed under the LGPLv2+.
*/
 
#pragma once
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <glib.h>
 
#ifdef _WIN32
#include <fileapi.h>
#endif
 
static inline gchar *g_realpath(const char *path)
{
#ifndef _WIN32
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
  char buffer[PATH_MAX] = { 0 };
 
  char* res = realpath(path, buffer);
 
  if(res)
  {
    return g_strdup(buffer);
  }
  else
  {
    fprintf(stderr, "path lookup '%s' fails with: '%s'\n", path, strerror(errno));
    exit(EXIT_FAILURE);
  }
#else
  char *buffer;
  char dummy;
  int rc, len;
 
  rc = GetFullPathNameA(path, 1, &dummy, NULL);
 
  if(rc == 0)
  {
    /* Weird failure, so just return the input path as such */
    return g_strdup(path);
  }
 
  len = rc + 1;
  buffer = g_malloc(len);
 
  rc = GetFullPathNameA(path, len, buffer, NULL);
 
  if(rc == 0 || rc > len)
  {
    /* Weird failure again */
    g_free(buffer);
    buffer = NULL;
    return g_strdup(path);
  }
 
  return buffer;
#endif
}
 
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