/* Open and close files for bison,
   Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.

This file is part of Bison, the GNU Compiler Compiler.

Bison 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, or (at your option)
any later version.

Bison 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 Bison; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#ifdef OS2
#define XPFILE   "bison.simple"
#define XPFILE1  "bison.hairy"
#endif

#ifdef VMS
#include <ssdef.h>
#define unlink delete
#ifndef XPFILE
#define XPFILE "GNU_BISON:[000000]BISON.SIMPLE"
#endif
#ifndef XPFILE1
#define XPFILE1 "GNU_BISON:[000000]BISON.HAIRY"
#endif
#endif

#include <stdio.h>
#include "system.h"
#include "files.h"
#include "new.h"
#include "gram.h"

FILE *finput = NULL;
FILE *foutput = NULL;
FILE *fdefines = NULL;
FILE *ftable = NULL;
FILE *fattrs = NULL;
FILE *fguard = NULL;
FILE *faction = NULL;
FILE *fparser = NULL;

/* File name specified with -o for the output file, or 0 if no -o.  */
char *spec_outfile;

char *infile;
char *outfile;
char *defsfile;
char *tabfile;
char *attrsfile;
char *guardfile;
char *actfile;
char *tmpattrsfile;
char *tmptabfile;
char *tmpdefsfile;

extern char	*mktemp();	/* So the compiler won't complain */
extern char	*getenv();
extern void	perror();
FILE	*tryopen();	/* This might be a good idea */
void done();

extern char *program_name;
extern int verboseflag;
extern int definesflag;
int fixed_outfiles = 0;


char*
stringappend(string1, end1, string2)
char *string1;
int end1;
char *string2;
{
  register char *ostring;
  register char *cp, *cp1;
  register int i;

  cp = string2;  i = 0;
  while (*cp++) i++;

  ostring = NEW2(i+end1+1, char);

  cp = ostring;
  cp1 = string1;
  for (i = 0; i < end1; i++)
    *cp++ = *cp1++;

  cp1 = string2;
  while (*cp++ = *cp1++) ;

  return ostring;
}


#ifdef OS2
char*
makename(string1, end1, string2a, string2b)
char *string1;
int end1;
char *string2a, *string2b;
{
  register char *ostring = stringappend(string1, end1, string2a);

  if (!IsFileNameValid(ostring)) {
    free(ostring);
    ostring = stringappend(string1, end1, string2b);
    if (!IsFileNameValid(ostring))
      ChangeNameForFAT(ostring);
  }

  return ostring;
}

char *
search_template(char *name, char *envvar)
{
  char filename[256], env[1024], *ptr, *last;

  if ( access(name, 0) == 0 )
    return name;

  if ( (ptr = getenv(envvar)) == NULL )
    return NULL;

  strcpy(env, ptr);

  for ( ptr = strtok(env, ";"); ptr != NULL; ptr = strtok(NULL, ";") )
  {
    strcpy(filename, ptr);
    last = strchr(filename, 0) - 1;
    if ( *last != '/' && *last != '\\' && *last != ':' )
      strcat(filename, "/");
    strcat(filename, name);
    
    if (!IsFileNameValid(filename))
      ChangeNameForFAT(filename);

    if ( access(filename, 0) == 0 )
      return strdup(filename);
  }

  return NULL;
}

char *
find_template(char *name)
{
  char *path;

  if ( (path = search_template(name, "INIT")) == NULL )
    if ( (path = search_template(name, "PATH")) == NULL )
      return name;

  return path;
}
#endif


/* JF this has been hacked to death.  Nowaday it sets up the file names for
   the output files, and opens the tmp files and the parser */
void
openfiles()
{
  char *name_base;
  register char *cp;
  char *filename;
  int base_length;
  int short_base_length;

#ifdef VMS
  char *tmp_base = "sys$scratch:b_";
#else
  char *tmp_base = "/tmp/b.";
#endif
  int tmp_len;

#if defined(MSDOS) || defined(OS2)
  tmp_base = getenv ("TMP");
  if (tmp_base == 0)
    tmp_base = "";
  strlwr (infile);
#endif /* MSDOS */

  tmp_len = strlen (tmp_base);

  if (spec_outfile)
    {
      /* -o was specified.  The precise -o name will be used for ftable.
	 For other output files, remove the ".c" or ".tab.c" suffix.  */
      name_base = spec_outfile;
#ifdef MSDOS
      strlwr (name_base);
#endif /* MSDOS */
      /* BASE_LENGTH includes ".tab" but not ".c".  */
      base_length = strlen (name_base);
      if (!strcmp (name_base + base_length - 2, ".c"))
	base_length -= 2;
      /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
      short_base_length = base_length;
      if (!strncmp (name_base + short_base_length - 4, ".tab", 4))
	short_base_length -= 4;
      else if (!strncmp (name_base + short_base_length - 4, "_tab", 4))
	short_base_length -= 4;
    }
  else if (spec_file_prefix)
    {
      /* -b was specified.  Construct names from it.  */
      /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
      short_base_length = strlen (spec_file_prefix);
      /* Count room for `.tab'.  */
      base_length = short_base_length + 4;
      name_base = (char *) xmalloc (base_length + 1);
      /* Append `.tab'.  */
      strcpy (name_base, spec_file_prefix);
#ifdef VMS
      strcat (name_base, "_tab");
#else
      strcat (name_base, ".tab");
#endif
#ifdef MSDOS
      strlwr (name_base);
#endif /* MSDOS */
    }
  else
    {
      /* -o was not specified; compute output file name from input
	 or use y.tab.c, etc., if -y was specified.  */

      name_base = fixed_outfiles ? "y.y" : infile;

      /* BASE_LENGTH gets length of NAME_BASE, sans ".y" suffix if any.  */

      base_length = strlen (name_base);
      if (!strcmp (name_base + base_length - 2, ".y"))
	base_length -= 2;
      short_base_length = base_length;

#ifdef VMS
      name_base = stringappend(name_base, short_base_length, "_tab");
      base_length = short_base_length + 4;
#else
#ifdef OS2
      name_base = makename(name_base, short_base_length, ".tab.c", "_tab.c");
      name_base[strlen(name_base) - 2] = 0;
      base_length = strlen(name_base);
      /* grrr, what a hack */
#else
#ifdef MSDOS
      name_base = stringappend(name_base, short_base_length, "_tab");
      base_length = short_base_length + 4;
#else
      name_base = stringappend(name_base, short_base_length, ".tab");
      base_length = short_base_length + 4;
#endif /* not MSDOS */
#endif
#endif
    }

  finput = tryopen(infile, "r");

  filename = getenv("BISON_SIMPLE");
#ifdef MSDOS
  /* File doesn't exist in current directory; try in INIT directory.  */
  cp = getenv("INIT");
  if (filename == 0 && cp != NULL)
    {
      filename = xmalloc(strlen(cp) + strlen(PFILE) + 2);
      strcpy(filename, cp);
      cp = filename + strlen(filename);
      *cp++ = '/';
      strcpy(cp, PFILE);
    }
#endif /* MSDOS */
#ifdef OS2
  if (filename == 0)
    filename = find_template(PFILE);
#endif /* OS2 */
  fparser = tryopen(filename ? filename : PFILE, "r");

  if (verboseflag)
    {
#ifdef MSDOS
      outfile = stringappend(name_base, short_base_length, ".out");
#else
      /* We used to use just .out if spec_name_prefix (-p) was used,
	 but that conflicts with Posix.  */
#ifdef OS2
      outfile = makename(name_base, short_base_length, ".output", ".out");
#else
      outfile = stringappend(name_base, short_base_length, ".output");
#endif
#endif
      foutput = tryopen(outfile, "w");
    }

#if defined(MSDOS) || defined(OS2)
  actfile = mktemp(stringappend(tmp_base, tmp_len, "/acXXXXXX"));
  tmpattrsfile = mktemp(stringappend(tmp_base, tmp_len, "/atXXXXXX"));
  tmptabfile = mktemp(stringappend(tmp_base, tmp_len, "/taXXXXXX"));
  tmpdefsfile = mktemp(stringappend(tmp_base, tmp_len, "/deXXXXXX"));
#else
  actfile = mktemp(stringappend(tmp_base, tmp_len, "act.XXXXXX"));
  tmpattrsfile = mktemp(stringappend(tmp_base, tmp_len, "attrs.XXXXXX"));
  tmptabfile = mktemp(stringappend(tmp_base, tmp_len, "tab.XXXXXX"));
  tmpdefsfile = mktemp(stringappend(tmp_base, tmp_len, "defs.XXXXXX"));
#endif /* not MSDOS */

  faction = tryopen(actfile, "w+");
  fattrs = tryopen(tmpattrsfile,"w+");
  ftable = tryopen(tmptabfile, "w+");

  if (definesflag)
    {
      defsfile = stringappend(name_base, base_length, ".h");
      fdefines = tryopen(tmpdefsfile, "w+");
    }

#if !defined(MSDOS) && !defined(OS2)
  unlink(actfile);
  unlink(tmpattrsfile);
  unlink(tmptabfile);
  unlink(tmpdefsfile);
#endif

	/* These are opened by `done' or `open_extra_files', if at all */
  if (spec_outfile)
    tabfile = spec_outfile;
  else
    tabfile = stringappend(name_base, base_length, ".c");

#ifdef VMS
  attrsfile = stringappend(name_base, short_base_length, "_stype.h");
  guardfile = stringappend(name_base, short_base_length, "_guard.c");
#else
#ifdef OS2
  attrsfile = makename(name_base, short_base_length, ".stype.h", ".sth");
  guardfile = makename(name_base, short_base_length, ".guard.c", ".guc");
#else
#ifdef MSDOS
  attrsfile = stringappend(name_base, short_base_length, ".sth");
  guardfile = stringappend(name_base, short_base_length, ".guc");
#else
  attrsfile = stringappend(name_base, short_base_length, ".stype.h");
  guardfile = stringappend(name_base, short_base_length, ".guard.c");
#endif /* not MSDOS */
#endif /* not OS2 */
#endif /* not VMS */
}



/* open the output files needed only for the semantic parser.
This is done when %semantic_parser is seen in the declarations section.  */

void
open_extra_files()
{
  FILE *ftmp;
  int c;
  char *filename, *cp;

  fclose(fparser);

  filename = (char *) getenv ("BISON_HAIRY");
#ifdef MSDOS
  /* File doesn't exist in current directory; try in INIT directory.  */
  cp = getenv("INIT");
  if (filename == 0 && cp != NULL)
    {
      filename = xmalloc(strlen(cp) + strlen(PFILE1) + 2);
      strcpy(filename, cp);
      cp = filename + strlen(filename);
      *cp++ = '/';
      strcpy(cp, PFILE1);
    }
#endif
#ifdef OS2
  if (filename == 0)
    filename = find_template(PFILE1);
#endif /* OS2 */
  fparser= tryopen(filename ? filename : PFILE1, "r");

		/* JF change from inline attrs file to separate one */
  ftmp = tryopen(attrsfile, "w");
  rewind(fattrs);
  while((c=getc(fattrs))!=EOF)	/* Thank god for buffering */
    putc(c,ftmp);
  fclose(fattrs);
  fattrs=ftmp;

  fguard = tryopen(guardfile, "w");

}

	/* JF to make file opening easier.  This func tries to open file
	   NAME with mode MODE, and prints an error message if it fails. */
FILE *
tryopen(name, mode)
char *name;
char *mode;
{
  FILE	*ptr;

  ptr = fopen(name, mode);
  if (ptr == NULL)
    {
      fprintf(stderr, "%s: ", program_name);
      perror(name);
      done(2);
    }
  return ptr;
}

void
done(k)
int k;
{
  if (faction)
    fclose(faction);

  if (fattrs)
    fclose(fattrs);

  if (fguard)
    fclose(fguard);

  if (finput)
    fclose(finput);

  if (fparser)
    fclose(fparser);

  if (foutput)
    fclose(foutput);

	/* JF write out the output file */
  if (k == 0 && ftable)
    {
      FILE *ftmp;
      register int c;

      ftmp=tryopen(tabfile, "w");
      rewind(ftable);
      while((c=getc(ftable)) != EOF)
        putc(c,ftmp);
      fclose(ftmp);
      fclose(ftable);

      if (definesflag)
        {
          ftmp = tryopen(defsfile, "w");
          fflush(fdefines);
          rewind(fdefines);
          while((c=getc(fdefines)) != EOF)
            putc(c,ftmp);
          fclose(ftmp);
          fclose(fdefines);
        }
    }

#ifdef VMS
  if (faction)
    delete(actfile);
  if (fattrs)
    delete(tmpattrsfile);
  if (ftable)
    delete(tmptabfile);
  if (k==0) sys$exit(SS$_NORMAL);
  sys$exit(SS$_ABORT);
#else
#if defined(MSDOS) || defined(OS2)
  if (actfile) unlink(actfile);
  if (tmpattrsfile) unlink(tmpattrsfile);
  if (tmptabfile) unlink(tmptabfile);
  if (tmpdefsfile) unlink(tmpdefsfile);
#endif /* MSDOS */
  exit(k);
#endif /* not VMS */
}