/* Macros for taking apart, interpreting and processing file names.
 *
 * These are here because some non-Posix (a.k.a. DOSish) systems have
 * drive letter brain-damage at the beginning of an absolute file name,
 * use forward- and back-slash in path names interchangeably, and
 * some of them have case-insensitive file names.
 *
 * This was based on filenames.h from BFD, the Binary File Descriptor
 * library, Copyright (C) 2000-2016 Free Software Foundation, Inc.,
 * and changed by O. Sezer <sezero@users.sourceforge.net> for our needs.
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
 */

#ifndef FILENAMES_H
#define FILENAMES_H

#include <cstring>

/* ---------------------- Windows, DOS, OS2: ---------------------- */
#if defined(__MSDOS__) || defined(__DOS__) || defined(__DJGPP__) || \
    defined(_MSDOS) || defined(__OS2__) || defined(__EMX__) ||      \
    defined(_WIN32) || defined(_Windows) || defined(__WINDOWS__) || \
    defined(__NT__) || defined(__CYGWIN__)

#define HAVE_DOS_BASED_FILE_SYSTEM 1
#define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1

#define HAS_DRIVE_SPEC(f) ((f)[0] && ((f)[1] == ':'))
#define STRIP_DRIVE_SPEC(f) ((f) + 2)
#define IS_DIR_SEPARATOR(c) ((c) == '/' || (c) == '\\')
/* both '/' and '\\' work as dir separator.  djgpp likes changing
 * '\\' into '/', so I define DIR_SEPARATOR_CHAR as '/' for djgpp,
 * '\\' otherwise.  */
#ifdef __DJGPP__
#define DIR_SEPARATOR_CHAR '/'
#define DIR_SEPARATOR_STR "/"
#else
#define DIR_SEPARATOR_CHAR '\\'
#define DIR_SEPARATOR_STR "\\"
#endif
/* Note that IS_ABSOLUTE_PATH accepts d:foo as well, although it is
   only semi-absolute.  This is because the users of IS_ABSOLUTE_PATH
   want to know whether to prepend the current working directory to
   a file name, which should not be done with a name like d:foo.  */
#define IS_ABSOLUTE_PATH(f) (IS_DIR_SEPARATOR((f)[0]) || HAS_DRIVE_SPEC((f)))

static inline char* FIND_FIRST_DIRSEP(char* _the_path)
{
    /* FIXME: What about C:FOO ? */
    char* p1 = strchr(_the_path, '/');
    char* p2 = strchr(_the_path, '\\');
    if(p1 == nullptr)
    {
        return p2;
    }
    if(p2 == nullptr)
    {
        return p1;
    }
    return (p1 < p2) ? p1 : p2;
}
static inline char* FIND_LAST_DIRSEP(char* _the_path)
{
    /* FIXME: What about C:FOO ? */
    char* p1 = strrchr(_the_path, '/');
    char* p2 = strrchr(_the_path, '\\');
    if(p1 == nullptr)
    {
        return p2;
    }
    if(p2 == nullptr)
    {
        return p1;
    }
    return (p1 > p2) ? p1 : p2;
}
static inline const char* FIND_FIRST_DIRSEP(const char* _the_path)
{
    /* FIXME: What about C:FOO ? */
    const char* p1 = strchr(_the_path, '/');
    const char* p2 = strchr(_the_path, '\\');
    if(p1 == nullptr)
    {
        return p2;
    }
    if(p2 == nullptr)
    {
        return p1;
    }
    return (p1 < p2) ? p1 : p2;
}
static inline const char* FIND_LAST_DIRSEP(const char* _the_path)
{
    /* FIXME: What about C:FOO ? */
    const char* p1 = strrchr(_the_path, '/');
    const char* p2 = strrchr(_the_path, '\\');
    if(p1 == nullptr)
    {
        return p2;
    }
    if(p2 == nullptr)
    {
        return p1;
    }
    return (p1 > p2) ? p1 : p2;
}

/* ----------------- AmigaOS, MorphOS, AROS, etc: ----------------- */
#elif defined(__MORPHOS__) || defined(__AROS__) || defined(AMIGAOS) ||        \
    defined(__amigaos__) || defined(__amigaos4__) || defined(__amigados__) || \
    defined(AMIGA) || defined(_AMIGA) || defined(__AMIGA__)

#define HAS_DRIVE_SPEC(f) (0)   /* */
#define STRIP_DRIVE_SPEC(f) (f) /* */
#define IS_DIR_SEPARATOR(c) ((c) == '/' || (c) == ':')
#define DIR_SEPARATOR_CHAR '/'
#define DIR_SEPARATOR_STR "/"
#define IS_ABSOLUTE_PATH(f) (IS_DIR_SEPARATOR((f)[0]) || (strchr((f), ':')))
#define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1

static inline char* FIND_FIRST_DIRSEP(char* _the_path)
{
    char* p = strchr(_the_path, ':');
    if(p != nullptr) return p;
    return strchr(_the_path, '/');
}
static inline char* FIND_LAST_DIRSEP(char* _the_path)
{
    char* p = strrchr(_the_path, '/');
    if(p != nullptr) return p;
    return strchr(_the_path, ':');
}
static inline const char* FIND_FIRST_DIRSEP(const char* _the_path)
{
    const char* p = strchr(_the_path, ':');
    if(p != nullptr) return p;
    return strchr(_the_path, '/');
}
static inline const char* FIND_LAST_DIRSEP(const char* _the_path)
{
    const char* p = strrchr(_the_path, '/');
    if(p != nullptr) return p;
    return strchr(_the_path, ':');
}

/* ---------------------- assumed UNIX-ish : ---------------------- */
#else /* */

#define IS_DIR_SEPARATOR(c) ((c) == '/')
#define DIR_SEPARATOR_CHAR '/'
#define DIR_SEPARATOR_STR "/"
#define IS_ABSOLUTE_PATH(f) (IS_DIR_SEPARATOR((f)[0]))
#define HAS_DRIVE_SPEC(f) (0)
#define STRIP_DRIVE_SPEC(f) (f)

static inline char* FIND_FIRST_DIRSEP(char* _the_path)
{
    return strchr(_the_path, '/');
}
static inline char* FIND_LAST_DIRSEP(char* _the_path)
{
    return strrchr(_the_path, '/');
}
static inline const char* FIND_FIRST_DIRSEP(const char* _the_path)
{
    return strchr(_the_path, '/');
}
static inline const char* FIND_LAST_DIRSEP(const char* _the_path)
{
    return strrchr(_the_path, '/');
}

#endif

#endif /* FILENAMES_H */
