/**[txh]********************************************************************

  Description:
  This file contains a replacement for djgpp's _fixpath function. Currently
I have two versions. Both are based in djgpp's code. One is for Linux
(adapted by Robert) and the other is for NT adapted by Anatoli Soltan.

***************************************************************************/

#include <cl/needs.h>

#if defined(TVOS_Win32) && !defined(TVCompf_Cygwin)
/* BC++/Win32, MingW32 and MSVC */
/* Copyright (C) 1997 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
/* Modified for Win32 by Anatoli Soltan */

#include <tv/configtv.h>
#define Uses_string
#define Uses_getcurdir
#ifndef TVComp_BCPP
 #define Uses_direct
#endif
#include <compatlayer.h>

#ifdef TVComp_BCPP

#include <dir.h>

static int __fp_getdisk(void)
{
  return getdisk();
}

#elif defined(TVComp_MSC) || defined(TVCompf_MinGW)

static int __fp_getdisk(void)
{
  return _getdrive() - 1;
}

#else
#error "No support for this compiler"
#endif

// getcurdir is provided by the compatibility layer ;-)
static char* __fp_getcurdir(char* out, int drive)
{
  if (!getcurdir(drive + 1, out))
    out += strlen(out);
  return out;
}

#define is_slash(c) CLY_IsValidDirSep(c)
#define is_term(c)  (CLY_IsValidDirSep(c) || c=='\0')

/* Takes as input an arbitrary path.  Fixes up the path by:
   1. Removing consecutive slashes
   2. Removing trailing slashes
   3. Making the path absolute if it wasn't already
   4. Removing "." in the path
   5. Removing ".." entries in the path (and the directory above them)
   6. Adding a drive specification if one wasn't there
   7. Converting all slashes to '/'
 */
void
_fixpath(const char *in, char *out)
{
  int           drive_number = 0;
  const char    *ip = in;
  char          *op = out;
  int           unc = CLY_IsUNC(in); /* is a UNC pathname */

  /* Add drive specification to output string */
  if (((*ip >= 'a' && *ip <= 'z') ||
       (*ip >= 'A' && *ip <= 'Z'))
      && (*(ip + 1) == ':'))
  {
    if (*ip >= 'a' && *ip <= 'z')
    {
      drive_number = *ip - 'a';
      *op++ = *ip++;
    }
    else
    {
      drive_number = *ip - 'A';
      *op++ = (char)(drive_number + 'a');
      ++ip;
    }
    *op++ = *ip++;
  }
  else if (!unc)
  {
    drive_number = __fp_getdisk();
    *op++ = (char)(drive_number + 'a');
    *op++ = ':';
  }

  /* Convert relative path to absolute */
  if (!is_slash(*ip))
  {
    *op++ = '/';
    op = __fp_getcurdir(op, drive_number);
  }

  /* Handle UNC path */
  if (unc)
  {
    *op++ = *ip++;
  }

  /* Step through the input path */
  while (*ip)
  {
    /* Skip input slashes */
    if (is_slash(*ip))
    {
      ip++;
      continue;
    }

    /* Skip "." and output nothing */
    if (*ip == '.' && is_term(*(ip + 1)))
    {
      ip++;
      continue;
    }

    /* Skip ".." and remove previous output directory */
    if (*ip == '.' && *(ip + 1) == '.' && is_term(*(ip + 2)))
    {
      ip += 2;
      /* Don't back up over drive spec */
      if (op > out + 2)
      {
        /* This requires "/" to follow drive spec */
        --op;
        while (!is_slash(*op)) --op;
      }
      continue;
    }

    /* Copy path component from in to out */
    *op++ = '/';
    while (!is_term(*ip)) *op++ = *ip++;
  }

  /* If root directory, insert trailing slash */
  if (op == out + 2) *op++ = '/';

  /* Null terminate the output */
  *op = '\0';

  /* Convert backslashes to slashes */
  for (op = out; *op; op++)
    if (*op == '\\') *op = '/';
}
/* vi: set ts=8 sw=2 : */
#define FIXPATH_DEFINED
#endif /* BC++/Win32, MingW32 and MSVC */







#if defined(NEEDS_FIXPATH) && !defined(FIXPATH_DEFINED)
/* DJGPP, Linux and CygWin */
/*
   Robert:
   Here now the very usefull function _fixpath() from DJGPP's
   libc 'fixpath.c'
   I have modified it to be used on unix systems (like linux).
*/

/* Copyright (C) 2002 Salvador E. Tropea */
/* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */

#define Uses_unistd
#define Uses_string
#define Uses_limits
#define Uses_getcurdir
#define Uses_stdlib
#include <compatlayer.h>

inline static int
is_slash(int c)
{
  return c == DIRSEPARATOR;
}

inline static int
is_term(int c)
{
  return c == DIRSEPARATOR || c == '\0';
}

/* Takes as input an arbitrary path.  Fixes up the path by:
   1. Removing consecutive slashes
   2. Removing trailing slashes
   3. Making the path absolute if it wasn't already
   4. Removing "." in the path
   5. Removing ".." entries in the path (and the directory above them)
 */
void _fixpath(const char *in, char *out)
{
  const char    *ip = in;
  char          *op = out;


  /* Convert ~ to the HOME environment variable */
  if (*ip == '~' && (is_slash(ip[1]) || !ip[1]))
  {
    const char *home = getenv("HOME");
    if (home)
    {
      strcpy(op,home);
      op += strlen(op);
      ip++;
      if (!*ip) return;
    }
  }

  /* Convert relative path to absolute */
  if (!is_slash(*ip))
  {
    getcurdir(0,op);
    op += strlen(op);
  }

#if defined(TVOSf_QNX4)
    /* Skip the first slashes, which are a node number part */
    /* Full QNX4 pathname is //node/dirpath/filename        */
    if ((ip==in) && (is_slash(*ip)) && (is_slash(*(ip+1))))
    {
      *op=*ip;
      ip++;
      op++;
    }
#endif // TVOSf_QNX4

  /* Step through the input path */
  while (*ip)
  {
    /* Skip input slashes */
    if (is_slash(*ip))
    {
      ip++;
      continue;
    }

    /* Skip "." and output nothing */
    if (*ip == '.' && is_term(*(ip + 1)))
    {
      ip++;
      continue;
    }

    /* Skip ".." and remove previous output directory */
    if (*ip == '.' && *(ip + 1) == '.' && is_term(*(ip + 2)))
    {
      ip += 2;
      /* Don't back up over root '/' */
      if (op > out )
      /* This requires "/" to follow drive spec */
        while (!is_slash(*--op));
      continue;
    }

    /* Copy path component from in to out */
    *op++ = '/';
    while (!is_term(*ip)) *op++ = *ip++;
  }

  /* If root directory, insert trailing slash */
  if (op == out) *op++ = '/';

  /* Null terminate the output */
  *op = '\0';

}

/*
  End of modified code from DJGPP's libc 'fixpath.c'
*/
#endif /* DJGPP, Linux and CygWin */

