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[bison.git] / src / files.c

/* Open and close files for bison,
   Copyright 1984, 1986, 1989, 1992, 2000, 2001 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, Inc., 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */


#include "system.h"
#include "getargs.h"
#include "files.h"
#include "gram.h"
#include "error.h"
#include "complain.h"

FILE *finput = NULL;

struct obstack action_obstack;
struct obstack attrs_obstack;
struct obstack output_obstack;

/* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
   tempting, but don't do that: for the time being our handling of the
   %directive vs --option leaves precedence to the options by deciding
   that if a %directive sets a variable which is really set (i.e., not
   NULL), then the %directive is ignored.  As a result, %name-prefix,
   for instance, will not be honored.  */

char *spec_outfile = NULL;	/* for -o. */
char *spec_file_prefix = NULL;	/* for -b. */
const char *spec_name_prefix = NULL;	/* for -p. */
char *spec_verbose_file = NULL;   /* for --verbose. */
char *spec_graph_file = NULL;   /* for -g. */
char *spec_defines_file = NULL; /* for --defines. */
char *parser_file_name = NULL;

char *infile = NULL;
char *attrsfile = NULL;

static char *base_name = NULL;
char *short_base_name = NULL;

/* C source file extension (the parser source).  */
const char *src_extension = NULL;
/* Header file extension (if option ``-d'' is specified).  */
const char *header_extension = NULL;

/* Should we insert '.tab' in yacc-compatible parsers?  */
int tab_extension = 0;
\f

/*--------------------------.
| Is SUFFIX ending STRING?  |
`--------------------------*/

int
strsuffix (const char *string, const char *suffix)
{
  size_t string_len = strlen (string);
  size_t suffix_len = strlen (suffix);
  if (suffix_len <= string_len)
    return !strcmp (string + string_len - suffix_len, suffix);
  else
    return 0;
}


/*-----------------------------------------------------------------.
| Return a newly allocated string composed of the concatenation of |
| STRING1, and STRING2.                                            |
`-----------------------------------------------------------------*/

char*
stringappend (const char *string1, const char *string2)
{
  size_t len = strlen (string1) + strlen (string2);
  char *res = XMALLOC (char, len + 1);
  char *cp;
  cp = stpcpy (res, string1);
  cp = stpcpy (cp, string2);
  return res;
}


/*-----------------------------------------------------------------.
| Computes the macro name used to avoid double inclusion in the    |
| header of the parser and store it in header_macro_name.  Be sure |
| to produce valid CPP names (don't start with digit, remain       |
| alphanumerical + underscore).                                    |
`-----------------------------------------------------------------*/

char *
compute_header_macro (void)
{
  const char *prefix = "BISON_";
  char *macro_name, *cp;

  if (spec_defines_file)
    {
      macro_name = XMALLOC (char,
			    strlen (prefix) +
			    strlen (spec_defines_file) + 1);
      cp = stpcpy (macro_name, prefix);
      cp = stpcpy (cp, spec_defines_file);
    }
  else
    {
      macro_name = XMALLOC (char,
			    strlen (prefix) +
			    strlen (base_name) +
			    strlen (header_extension) + 1);
      cp = stpcpy (macro_name, prefix);
      cp = stpcpy (cp, base_name);
      cp = stpcpy (cp, header_extension);
    }

  for (cp = macro_name; *cp; ++cp)
    if (islower (*cp))
      *cp = toupper (*cp);
    else if (!isalnum (*cp))
      *cp = '_';

  return macro_name;
}


/*-----------------------------------------------------------------.
| Try to open file NAME with mode MODE, and print an error message |
| if fails.                                                        |
`-----------------------------------------------------------------*/

FILE *
xfopen (const char *name, const char *mode)
{
  FILE *ptr;

  ptr = fopen (name, mode);
  if (!ptr)
    error (2, errno, _("cannot open file `%s'"), name);

  return ptr;
}

/*-------------------------------------------------------------.
| Try to close file PTR, and print an error message if fails.  |
`-------------------------------------------------------------*/

int
xfclose (FILE *ptr)
{
  int result;

  if (ptr == NULL)
    return 0;

  result = fclose (ptr);
  if (result == EOF)
    error (2, errno, _("cannot close file"));

  return result;
}


/*------------------------------------------------------------------.
| Return the path to the skeleton which locaction might be given in |
| ENVVAR, otherwise return SKELETON_NAME.                           |
`------------------------------------------------------------------*/

const char *
skeleton_find (const char *envvar, const char *skeleton_name)
{
  const char *res = getenv (envvar);

#if defined (MSDOS) || defined (_WIN32)
  if (!res)
    {
      /* Skeleton file name without path */
      const char *skel_name = strrchr (skeleton_name, '/');
      if (!skel_name)
        skel_name = strrchr (skeleton_name, '\\');
      if (!skel_name)
        skel_name = skeleton_name;
      else
        ++skel_name;

      /* File doesn't exist in current directory; try in INIT directory.  */
      const char *cp = getenv ("INIT");
      if (cp)
	{
	  res = XMALLOC (char, strlen (cp) + strlen (skel_name) + 2);
	  sprintf (res, "%s%c%s", cp, '\\', skel_name);
	}
      else if (access (skel_name, 4) == 0) /* Look in current dir. */
        res = skel_name;
      else
	{
	  /* Look in program locations dir. */
	  extern char *program_name;
	  cp = strrchr(program_name, '\\');
	  if (!cp)
	    return skeleton_name;
	  else
	    ++cp;
	  res = XMALLOC (char, cp - program_name + strlen (skel_name) + 1);
	  strncpy (res, program_name, cp - program_name);
	  strcpy (res + (cp - program_name), skel_name);
	}
    }
#endif /* defined (MSDOS) || defined (_WIN32) */
  if (!res)
    res = skeleton_name;

  return res;
}
\f

/*----------------------------------------------------------------.
| Compute BASE_NAME, SHORT_BASE_NAME and output files extensions. |
`----------------------------------------------------------------*/

/* Replace all characters FROM by TO in the string IN.
   and returns a new allocated string.  */
static char *
tr (const char *in, char from, char to)
{
  char *temp;
  char *out;

  out = XMALLOC (char, strlen (in) + 1);

  for (temp = out; *in; in++, out++)
    if (*in == from)
      *out = to;
    else
      *out = *in;
  *out = 0;
  return (temp);
}

/* Gets the extension index in FILENAME. Returns 0 if fails to
   find an extension.  */
static int
get_extension_index (const char *filename)
{
  int len;

  len = strlen (filename);

  if (filename[len-- - 1] == '.')
    return (0);

  while ((len > 0) && (filename[len - 1] != '.'))
    if (filename[len - 1] == '/')
      return (0);
    else
      len--;

  return (len - 1);
}

/* Computes extensions from the grammar file extension. */
static void
compute_exts_from_gf (const char *ext)
{
  src_extension = tr (ext, 'y', 'c');
  src_extension = tr (src_extension, 'Y', 'C');
  header_extension = tr (ext, 'y', 'h');
  header_extension = tr (header_extension, 'Y', 'H');
}

/* Computes extensions from the given c source file extension. */
static void
compute_exts_from_src (const char *ext)
{
  /* We use this function when the user specifies `-o' or `--output',
     so the extenions must be computed unconditionally from the file name
     given by this option.  */
  src_extension = xstrdup (ext);
  header_extension = tr (ext, 'c', 'h');
  header_extension = tr (header_extension, 'C', 'H');
}

/* FIXME: Should use xstrndup. */

static void
compute_base_names (void)
{
  size_t base_length;
  size_t short_base_length;
  size_t ext_index;

  /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
     BASE_NAME and SHORT_BASE_NAME are `foo'.

     If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
     SHORT_BASE_NAME is `foo'.

     The precise -o name will be used for FTABLE.  For other output
     files, remove the ".c" or ".tab.c" suffix.  */
  if (spec_outfile)
    {
#ifdef MSDOS
      strlwr (spec_outfile);
#endif /* MSDOS */
      /* BASE_LENGTH includes ".tab" but not ".c".  */
      base_length = strlen (spec_outfile);

      ext_index = get_extension_index (spec_outfile);
      /* If the initial segment of extension contains 'c' or a 'C', I assume
         that it is a C or C++ source file.  */
      if (ext_index)
	ext_index =
	  (strspn (spec_outfile + ext_index + 1, "cC")) ? ext_index : 0;
      if (ext_index)
	{
	  base_length -= strlen (spec_outfile + ext_index);
	  compute_exts_from_src (spec_outfile + ext_index);
	}

      base_name = strndup (spec_outfile, base_length);
      /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
      short_base_length = base_length;
      if (strsuffix (base_name, ".tab") || strsuffix (base_name, "_tab"))
	short_base_length -= 4;
      short_base_name = strndup (spec_outfile, short_base_length);

      /* FIXME: This is a quick and dirty way for me to find out if we
	 should .tab or not, using the computations above.  */
      if (strcmp (base_name, short_base_name))
	tab_extension = 1;

      return;
    }

  /* If --file-prefix=foo was specified, BASE_NAME and SHORT_BASE_NAME
     are `foo'.

     Construct names from it.  */
  if (spec_file_prefix)
    {
#ifdef MSDOS
      strlwr (spec_file_prefix);
#endif /* MSDOS */
      short_base_name = xstrdup (spec_file_prefix);
      base_name = XMALLOC (char,
			   strlen (short_base_name) + strlen (EXT_TAB) + 1);
      stpcpy (stpcpy (base_name, short_base_name), EXT_TAB);

      /* Computes the extensions from the garmmar file name.  */
      ext_index = get_extension_index (infile);
      /* If the initial segment of extension contains a 'y' or a 'Y', I assume
         that it is a yacc or bison grammar file.  */
      if (ext_index)
	ext_index = (strspn (infile + ext_index + 1, "yY")) ? ext_index : 0;
      if (ext_index)
	compute_exts_from_gf (infile + ext_index);

      /* It seems that when only a prefix is given, '.tab' should always be
	 used.  */
      tab_extension = 1;

      return;
    }

  /* If neither -o nor --file-prefix were specified, and the input
     file is foo.y, BASE_NAME is `foo.tab', and SHORT_BASE_NAME is
     `foo'.

     If --yacc is used, do as if the input file was `y.y'.  */
  {
    const char *name_base = yacc_flag ? "y.y" : infile;

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

    base_length = strlen (name_base);

    ext_index = get_extension_index (name_base);
    /* If the initial segment of extension contains a 'y' or a 'Y', I assume
       that it is a yacc or bison grammar file.  */
    if (ext_index)
      ext_index = (strspn (name_base + ext_index + 1, "yY")) ? ext_index : 0;
    if (ext_index)
      {
	base_length -= strlen (name_base + ext_index);
	compute_exts_from_gf (name_base + ext_index);
      }

    short_base_length = base_length;
    short_base_name = strndup (name_base, short_base_length);

    base_name = XMALLOC (char,
			 strlen (short_base_name) + strlen (EXT_TAB) + 1);
    stpcpy (stpcpy (base_name, short_base_name), EXT_TAB);

    /* By default, Bison should insert '.tab' were needed.  */
    tab_extension = 1;

    return;
  }
}

/*-------------------------------------------------------.
| Close the open files, compute the output files names.  |
`-------------------------------------------------------*/

void
compute_output_file_names (void)
{
  compute_base_names ();

  parser_file_name =
    spec_outfile ? spec_outfile : stringappend (base_name, src_extension);

  /* If not yet done. */
  if (!src_extension)
    src_extension = ".c";
  if (!header_extension)
    header_extension = ".h";

  /* It the defines filename if not given, we create it.  */
  if (!spec_defines_file)
    spec_defines_file = stringappend (base_name, header_extension);

  /* It the graph filename if not given, we create it.  */
  if (!spec_graph_file)
    spec_graph_file = stringappend (short_base_name, ".vcg");

  spec_verbose_file = stringappend (short_base_name, EXT_OUTPUT);

  attrsfile = stringappend (short_base_name, EXT_STYPE_H);
#ifndef MSDOS
  attrsfile = stringappend (attrsfile, header_extension);
#endif /* MSDOS */
}