/****************************************************************************
 *                                                                          *
 *                         GNAT COMPILER COMPONENTS                         *
 *                                                                          *
 *                           I N I T I A L I Z E                            *
 *                                                                          *
 *                          C Implementation File                           *
 *                                                                          *
 *            Copyright (C) 2014-2021, Free Software Foundation, Inc.       *
 *                                                                          *
 * GNAT is free software;  you can  redistribute it  and/or modify it under *
 * terms of the  GNU General Public License as published  by the Free Soft- *
 * ware  Foundation;  either version 3,  or (at your option) any later ver- *
 * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
 * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
 * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
 *                                                                          *
 * As a special exception under Section 7 of GPL version 3, you are granted *
 * additional permissions described in the GCC Runtime Library Exception,   *
 * version 3.1, as published by the Free Software Foundation.               *
 *                                                                          *
 * You should have received a copy of the GNU General Public License and    *
 * a copy of the GCC Runtime Library Exception along with this program;     *
 * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
 * <http://www.gnu.org/licenses/>.                                          *
 *                                                                          *
 * GNAT was originally developed  by the GNAT team at  New York University. *
 * Extensive contributions were provided by Ada Core Technologies Inc.      *
 *                                                                          *
 ****************************************************************************/

/*  This unit provides implementation for __gnat_runtime_initialize ()
    which is called in adainit() to do special initialization needed by
    the GNAT runtime.  */


/* The following include is here to meet the published VxWorks requirement
   that the __vxworks header appear before any other include.  */
#ifdef __vxworks
#include "vxWorks.h"
#endif

#ifdef IN_RTS
/* We don't have libiberty, so use malloc.  */
#define xmalloc(S) malloc (S)
#define xrealloc(V,S) realloc (V,S)
#else
#include "config.h"
#include "system.h"
#endif

#include "raise.h"
#include <fcntl.h>

#ifdef __cplusplus
extern "C" {
#endif

/**************************************************/
/* __gnat_runtime_initialize (NT-mingw32 Version) */
/**************************************************/

extern void __gnat_install_handler (void);

int __gnat_wide_text_translation_required = 0;
/* wide text translation, 0=none, 1=activated */

int __gnat_rt_init_count = 0;
/* number of references to the GNAT runtime, this is used to initialize
   and finalize properly the run-time. */

#if defined (__MINGW32__)
#include "mingw32.h"
#include <windows.h>

extern void __gnat_init_float (void);

extern int gnat_argc;
extern char **gnat_argv;
extern CRITICAL_SECTION ProcListCS;
extern HANDLE ProcListEvt;

#ifdef GNAT_UNICODE_SUPPORT

#define EXPAND_ARGV_RATE 128

int __gnat_do_argv_expansion = 1;
#pragma weak __gnat_do_argv_expansion

/* Assuming we are pointing to the beginning of a quoted part of an
argument, skip until the end of the quoted part.  */
static void skip_quoted_string (const WCHAR **current_in,
				WCHAR **current_out)
{
  /* Number of backslashes buffered.  */
  int qbs_count = 0;

  /* Pointer to current input character.  */
  const WCHAR *ci = *current_in;

  /* Pointer to next output character.  */
  WCHAR *co = *current_out;

  /* Skip initial quote.  */
  ci++;

  while (*ci)
    {
      if (*ci == '\\')
	{
	  /* Buffer incoming backslashes.  */
	  qbs_count++;
	}
      else if (*ci == '"')
	{
	  /* Append qbs_count / 2 backslahes.  */
	  for (int i=0; i<qbs_count / 2; i++)
	    {
	      *co = '\\';
	      co++;
	    }
	  if ((qbs_count & 1) == 0)
	    {
	      /* 2n backslashes means that the quotation mark is the end of
	         the quoted portion.  */
	      qbs_count = 0;
	      break;
	    }
	  else
	    {
	      /* Otherwise this is a double quote literal.  */
	      qbs_count = 0;
	      *co = '"'; co++;
	    }
	}
      else
	{
	  /* If the character is not a double quote we should append
	     qbs_count backslashes.  */
	  for (int i=0; i<qbs_count; i++)
	    {
	      *co = '\\';
	      co++;
	    }
	  *co = *ci; co++;
	  qbs_count = 0;
	}
      ci++;
    }

  /* Handle the case in which a nul character was found instead of a closing
     double quote. In that case consider all the backslashes as literal
     characters. */
  if (*ci == '\0')
    {
      for (int i=0; i<qbs_count; i++)
        {
          *co='\\';
          co++;
        }
    }

  *current_in = ci;
  *current_out = co;
}

/* Assuming that this is the beginning of an argument. Skip characters
   until we reach the character right after the last argument character.  */
static void skip_argument (const WCHAR **current_in,
			   WCHAR **current_out)
{
  /* Number of backslashes buffered.  */
  int bs_count = 0;

  /* Pointer to current input character.  */
  const WCHAR *ci = *current_in;

  /* Pointer to next output character.  */
  WCHAR *co = *current_out;

  while (*ci && ! (*ci == ' ' || *ci == '\t'))
    {
      if (*ci == '\\')
	{
	  /* Buffer incoming backslashes.  */
	  bs_count++;
	}
      else if (*ci == '"')
	{
	  /* Append qbs_count / 2 backslahes.  */
	  for (int i=0; i< bs_count / 2; i++)
	    {
	      *co = '\\'; co++;
	    }
	  if ((bs_count & 1) == 0)
	    {
	      /* 2n backslashes followed by a quotation mark means that
		 this is a start of a quoted string.  */
	      skip_quoted_string (&ci, &co);
	    }
	  else
	    {
	      /* Otherwise this is quotation mark literal.  */
	      *co = '"';
	      co++;
	    }
	  bs_count = 0;
	}
      else
	{
	  /* This is a regular character. */
	  /* Backslashes are interpreted literally.  */
	  for (int i=0; i<bs_count; i++)
	    {
	      *co = '\\';
	      co++;
	    }
	  bs_count = 0;
	  *co = *ci; co++;
	}
      if (*ci != '\0')
        {
          ci++;
        }
    }

  for (int i=0; i<bs_count; i++)
    {
      *co = '\\';
      co++;
    }

  /* End the argument with a null character. */
  *co = '\0';
  co++;

  *current_in = ci;
  *current_out = co;
}


void __gnat_get_argw (const WCHAR *command_line, WCHAR ***argv, int *argc)
{
  WCHAR *inline_argv;
  WCHAR *co;
  int arg_count = 1;
  const WCHAR *ci;

  inline_argv =
    (WCHAR *) xmalloc ((wcslen (command_line) + 1) * sizeof (WCHAR));
  co = inline_argv;

  /* Start iteration on command line characters. */
  ci = command_line;

  /* Skip command name. Note that if the command line starts with whitechars
     then the command name will be the empty string. */
  skip_argument (&ci, &co);

  /* Count remaining arguments. */
  while (*ci)
    {
      /* skip whitechar */
      while (*ci && (*ci == ' ' || *ci == '\t')) { ci++; }
      if (*ci)
	{
	  skip_argument (&ci, &co);
	  arg_count++;
	}
      else
	break;
    }

  /* Allocate table with pointer to each arguments */
  argv[0] = (WCHAR **) xmalloc (arg_count * sizeof (WCHAR *));

  for (int idx = 0; idx < arg_count; idx++)
    {
      argv[0][idx] = inline_argv;
      while (*inline_argv)
	{
	  inline_argv++;
	}
      inline_argv++;
     }
  *argc = arg_count;
}

static void
append_arg (int *index, LPWSTR dir, LPWSTR value,
	    char ***argv, int *last, int quoted)
{
  int size;
  LPWSTR fullvalue;
  int vallen = _tcslen (value);
  int dirlen;

  if (dir == NULL)
    {
      /* no dir prefix */
      dirlen = 0;
      fullvalue = (LPWSTR) xmalloc ((vallen + 1) * sizeof (TCHAR));
    }
  else
    {
      /* Add dir first */
      dirlen = _tcslen (dir);

      fullvalue = (LPWSTR) xmalloc ((dirlen + vallen + 1) * sizeof (TCHAR));
      _tcscpy (fullvalue, dir);
    }

  /* Append value */

  if (quoted)
    {
      _tcsncpy (fullvalue + dirlen, value + 1, vallen - 1);
      fullvalue [dirlen + vallen - sizeof (TCHAR)] = _T ('\0');
    }
  else
    _tcscpy (fullvalue + dirlen, value);

  if (*last <= *index)
    {
      *last += EXPAND_ARGV_RATE;
      *argv = (char **) xrealloc (*argv, (*last) * sizeof (char *));
    }

  size = WS2SC (NULL, fullvalue, 0);
  (*argv)[*index] = (char *) xmalloc (size + sizeof (TCHAR));
  WS2SC ((*argv)[*index], fullvalue, size);

  free (fullvalue);

  (*index)++;
}
#endif

void
__gnat_runtime_initialize (int install_handler)
{
  /*  increment the reference counter */

  __gnat_rt_init_count++;

  /*  if already initialized return now */
  if (__gnat_rt_init_count > 1)
    return;

   /* Initialize floating-point coprocessor. This call is needed because
      the MS libraries default to 64-bit precision instead of 80-bit
      precision, and we require the full precision for proper operation,
      given that we have set Max_Digits etc with this in mind */

   __gnat_init_float ();

   /* Initialize the critical section and event handle for the win32_wait()
      implementation, see adaint.c */

   InitializeCriticalSection (&ProcListCS);
   ProcListEvt = CreateEvent (NULL, FALSE, FALSE, NULL);

#ifdef GNAT_UNICODE_SUPPORT
   /* Set current code page for filenames handling. */
   {
     char *codepage = getenv ("GNAT_CODE_PAGE");

     /* Default code page is UTF-8.  */
     __gnat_current_codepage = CP_UTF8;

     if (codepage != NULL)
       {
	 if (strcmp (codepage, "CP_ACP") == 0)
	   __gnat_current_codepage = CP_ACP;
	 else if (strcmp (codepage, "CP_UTF8") == 0)
	   __gnat_current_codepage = CP_UTF8;
       }
   }

   /* Set current encoding for the IO.  */
   {
     char *ccsencoding = getenv ("GNAT_CCS_ENCODING");

     /* Default CCS Encoding.  */
     __gnat_current_ccs_encoding = _O_TEXT;
     __gnat_wide_text_translation_required = 0;

     if (ccsencoding != NULL)
       {
	 if (strcmp (ccsencoding, "U16TEXT") == 0)
           {
             __gnat_current_ccs_encoding = _O_U16TEXT;
             __gnat_wide_text_translation_required = 1;
           }
	 else if (strcmp (ccsencoding, "TEXT") == 0)
           {
             __gnat_current_ccs_encoding = _O_TEXT;
             __gnat_wide_text_translation_required = 0;
           }
	 else if (strcmp (ccsencoding, "WTEXT") == 0)
           {
             __gnat_current_ccs_encoding = _O_WTEXT;
             __gnat_wide_text_translation_required = 1;
           }
	 else if (strcmp (ccsencoding, "U8TEXT") == 0)
           {
             __gnat_current_ccs_encoding = _O_U8TEXT;
             __gnat_wide_text_translation_required = 1;
           }
       }
   }

   /* Adjust gnat_argv to support Unicode characters. */
   {
     LPWSTR *wargv;
     int wargc;
     int k;
     int last;
     int argc_expanded = 0;
     TCHAR result [MAX_PATH];
     int quoted;

     __gnat_get_argw (GetCommandLineW (), &wargv, &wargc);

     if (wargv != NULL)
       {
	 /* Set gnat_argv with arguments encoded in UTF-8. */
	 last = wargc + 1;
	 gnat_argv = (char **) xmalloc ((last) * sizeof (char *));

	 /* argv[0] is the executable full path-name. */

	 SearchPath (NULL, wargv[0], _T(".exe"), MAX_PATH, result, NULL);
	 append_arg (&argc_expanded, NULL, result, &gnat_argv, &last, 0);

	 for (k=1; k<wargc; k++)
	   {
	     quoted = (wargv[k][0] == _T('\''));

	     /* Check for wildcard expansion if the argument is not quoted. */
	     if (!quoted && __gnat_do_argv_expansion
		 && (_tcsstr (wargv[k], _T("?")) != 0 ||
		     _tcsstr (wargv[k], _T("*")) != 0))
	       {
		 /* Wilcards are present, append all corresponding matches. */
		 WIN32_FIND_DATA FileData;
		 HANDLE hDir = FindFirstFile (wargv[k], &FileData);
		 LPWSTR dir = NULL;
		 LPWSTR ldir = _tcsrchr (wargv[k], _T('\\'));

		 if (ldir == NULL)
		   ldir = _tcsrchr (wargv[k], _T('/'));

		 if (hDir == INVALID_HANDLE_VALUE)
		   {
		     /* No match, append arg as-is. */
		     append_arg (&argc_expanded, NULL, wargv[k],
				 &gnat_argv, &last, quoted);
		   }
		 else
		   {
		     if (ldir != NULL)
		       {
			 int n = ldir - wargv[k] + 1;
			 dir = (LPWSTR) xmalloc ((n + 1) * sizeof (TCHAR));
			 _tcsncpy (dir, wargv[k], n);
			 dir[n] = _T('\0');
		       }

		     /* Append first match and all remaining ones.  */

		     do {
		       /* Do not add . and .. special entries */

		       if (_tcscmp (FileData.cFileName, _T(".")) != 0
			   && _tcscmp (FileData.cFileName, _T("..")) != 0)
			 append_arg (&argc_expanded, dir, FileData.cFileName,
				     &gnat_argv, &last, 0);
		     } while (FindNextFile (hDir, &FileData));

		     FindClose (hDir);

		     if (dir != NULL)
		       free (dir);
		   }
	       }
	     else
	       {
		 /*  No wildcard. Store parameter as-is. Remove quote if
		     needed. */
		 append_arg (&argc_expanded, NULL, wargv[k],
			     &gnat_argv, &last,
                             quoted && __gnat_do_argv_expansion);
	       }
	   }

	 free (wargv[0]);
	 free (wargv);
	 gnat_argc = argc_expanded;
	 gnat_argv = (char **) xrealloc
	   (gnat_argv, argc_expanded * sizeof (char *));
       }
   }
#endif

  if (install_handler)
    __gnat_install_handler();
}

/**************************************************/
/* __gnat_runtime_initialize (init_float version) */
/**************************************************/

#elif defined (__Lynx__) || defined (__FreeBSD__) || defined(__NetBSD__) \
  || defined (__OpenBSD__)

extern void __gnat_init_float (void);

void
__gnat_runtime_initialize(int install_handler)
{
  /*  increment the reference counter */

  __gnat_rt_init_count++;

  /*  if already initialized return now */
  if (__gnat_rt_init_count > 1)
    return;

   __gnat_init_float ();

  if (install_handler)
    __gnat_install_handler();
}

/***********************************************/
/* __gnat_runtime_initialize (VxWorks Version) */
/***********************************************/

#elif defined(__vxworks)

extern void __gnat_init_float (void);

void
__gnat_runtime_initialize(int install_handler)
{
  /*  increment the reference counter */

  __gnat_rt_init_count++;

  /*  if already initialized return now */
  if (__gnat_rt_init_count > 1)
    return;

  __gnat_init_float ();

  if (install_handler)
    __gnat_install_handler();
}

#else

/***********************************************/
/* __gnat_runtime_initialize (default version) */
/***********************************************/

void
__gnat_runtime_initialize(int install_handler)
{
  /*  increment the reference counter */

  __gnat_rt_init_count++;

  /*  if already initialized return now */
  if (__gnat_rt_init_count > 1)
    return;

  if (install_handler)
    __gnat_install_handler();
}

#endif

#ifdef __cplusplus
}
#endif