Fix the previous test.

[bison.git] / src / files.c

diff --git a/src/files.c b/src/files.c
index 00342429f4602efb0eddbdd683ba13e9fbdf77ed..22f29c1ed06c3f11a38a532900157a00b0e011ca 100644 (file)
--- a/src/files.c
+++ b/src/files.c
@@ -1,394 +1,440 @@
 /* Open and close files for bison,
 /* Open and close files for bison,

-   Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
+   Copyright 1984, 1986, 1989, 1992, 2000, 2001, 2002
+   Free Software Foundation, Inc.

 
 

-This file is part of Bison, the GNU Compiler Compiler.
+   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 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.
+   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.  */
+   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.  */

 
 
 
 

-#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 "system.h"

+#include "getargs.h"

 #include "files.h"
 #include "files.h"

-#include "new.h"

 #include "gram.h"
 #include "gram.h"

+#include "error.h"
+#include "complain.h"
+
+/* From basename.c.  Almost a lie, as it returns a char *. */
+const char *base_name PARAMS ((char const *name));

 
 FILE *finput = NULL;
 
 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;
-\f

 
 

-char*
-stringappend(string1, end1, string2)
-char *string1;
-int end1;
-char *string2;
-{
-  register char *ostring;
-  register char *cp, *cp1;
-  register int i;
+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 *full_base_name = NULL;
+
+/* Prefix used to generate output file names.  */
+char *short_base_name = NULL;
+
+/* Infix used to generate output file names (i.e., `.tab', or `_tab',
+   or `').  */
+char *output_infix = 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;
+\f

 
 

-  cp = string2;  i = 0;
-  while (*cp++) i++;
+/*--------------------------.
+| Is SUFFIX ending STRING?  |
+`--------------------------*/

 
 

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

 
 

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

 
 

-  cp1 = string2;
-  while (*cp++ = *cp1++) ;
+/*-----------------------------------------------------------------.
+| Return a newly allocated string composed of the concatenation of |
+| STRING1, and STRING2.                                            |
+`-----------------------------------------------------------------*/

 
 

-  return ostring;
+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;

 }
 
 
 }
 
 

-/* 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()
+/*-----------------------------------------------------------------.
+| 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)

 {
 {

-  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;
-
-#ifdef MSDOS
-  tmp_base = getenv ("TMP");
-  if (tmp_base == 0)
-    tmp_base = "";
-  strlwr (infile);
-#endif /* MSDOS */
-
-  tmp_len = strlen (tmp_base);
+  const char *prefix = "BISON_";
+  char *macro_name, *cp;

 
 

-  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)
+  if (spec_defines_file)

     {
     {

-      /* -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 *) mallocate (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 */
+      macro_name = XMALLOC (char,
+                           strlen (prefix) +
+                           strlen (spec_defines_file) + 1);
+      cp = stpcpy (macro_name, prefix);
+      cp = stpcpy (cp, spec_defines_file);

     }
   else
     {
     }
   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");
-#else
-#ifdef MSDOS
-      name_base = stringappend(name_base, short_base_length, "_tab");
-#else
-      name_base = stringappend(name_base, short_base_length, ".tab");
-#endif /* not MSDOS */
-#endif
-      base_length = short_base_length + 4;
+      macro_name = XMALLOC (char,
+                           strlen (prefix) +
+                           strlen (full_base_name) +
+                           strlen (header_extension) + 1);
+      cp = stpcpy (macro_name, prefix);
+      cp = stpcpy (cp, full_base_name);
+      cp = stpcpy (cp, header_extension);

     }
 
     }
 

-  finput = tryopen(infile, "r");
+  for (cp = macro_name; *cp; ++cp)
+    if (islower (*cp))
+      *cp = toupper (*cp);
+    else if (!isalnum (*cp))
+      *cp = '_';

 
 

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

 
 

-  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.  */
-      outfile = stringappend(name_base, short_base_length, ".output");
-#endif
-      foutput = tryopen(outfile, "w");
-    }

 
 

-#ifdef MSDOS
-  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+");
-    }
+/*-----------------------------------------------------------------.
+| 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;

 
 

-#ifndef MSDOS
-  unlink(actfile);
-  unlink(tmpattrsfile);
-  unlink(tmptabfile);
-  unlink(tmpdefsfile);
-#endif
+  ptr = fopen (name, mode);
+  if (!ptr)
+    error (2, errno, _("cannot open file `%s'"), name);

 
 

-       /* 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 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 VMS */
+  return ptr;

 }
 
 }
 

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

 
 

+int
+xfclose (FILE *ptr)
+{
+  int result;

 
 

-/* open the output files needed only for the semantic parser.
-This is done when %semantic_parser is seen in the declarations section.  */
+  if (ptr == NULL)
+    return 0;

 
 

-void
-open_extra_files()
-{
-  FILE *ftmp;
-  int c;
-  char *filename, *cp;
+  result = fclose (ptr);
+  if (result == EOF)
+    error (2, errno, _("cannot close file"));
+
+  return result;
+}

 
 

-  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 != 0)
+/*------------------------------------------------------------------.
+| 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)
+  const char *cp = getenv ("INIT");
+  if (!res)

     {
     {

-      filename = malloc(strlen(cp) + strlen(PFILE1) + 2);
-      strcpy(filename, cp);
-      cp = filename + strlen(filename);
-      *cp++ = '/';
-      strcpy(cp, PFILE1);
+      /* 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.  */
+      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
-  fparser= tryopen(filename ? filename : PFILE1, "r");
+#endif /* defined (MSDOS) || defined (_WIN32) */
+  if (!res)
+    res = skeleton_name;

 
 

-               /* 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;
+  return res;
+}
+\f

 
 

-  fguard = tryopen(guardfile, "w");
+/*----------------------------------------------------------------.
+| 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);

 }
 
 }
 

-       /* 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;
+/* Computes extensions from the grammar file extension. */
+static void
+compute_exts_from_gf (const char *ext)

 {
 {

-  FILE *ptr;
+  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');
+}

 
 

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

 }
 
 }
 

-void
-done(k)
-int k;
+
+/* Decompose FILENAME in four parts: *BASE, *TAB, and *EXT, the fourth
+   part, (the directory) is ranging from FILENAME to the char before
+   *BASE, so we don't need an additional parameter.
+
+   *EXT points to the last period in the basename, or NULL if none.
+
+   If there is no *EXT, *TAB is NULL.  Otherwise, *TAB points to
+   `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
+   cannot be equal to *BASE.
+
+   None are allocated, they are simply pointers to parts of FILENAME.
+   Examples:
+
+   '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
+   '.c'
+
+   'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
+
+   'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
+
+   '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
+
+   'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
+
+   'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
+
+   'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL.  */
+
+static void
+filename_split (const char *filename,
+               const char **base, const char **tab, const char **ext)

 {
 {

-  if (faction)
-    fclose(faction);
+  *base = base_name (filename);
+
+  /* Look for the extension, i.e., look for the last dot. */
+  *ext = strrchr (*base, '.');
+  *tab = NULL;
+
+  /* If there is an exentension, check if there is a `.tab' part right
+     before.  */
+  if (*ext
+      && (*ext - *base) > (int) strlen (".tab")
+      && (!strncmp (*ext - strlen (".tab"), ".tab", strlen (".tab"))
+         || !strncmp (*ext - strlen ("_tab"), "_tab", strlen ("_tab"))))
+    *tab = *ext - strlen (".tab");
+}

 
 

-  if (fattrs)
-    fclose(fattrs);

 
 

-  if (fguard)
-    fclose(fguard);
+/* FIXME: Should use xstrndup. */

 
 

-  if (finput)
-    fclose(finput);
+static void
+compute_base_names (void)
+{
+  const char *base, *tab, *ext;

 
 

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

 
 

-  if (foutput)
-    fclose(foutput);
+     If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
+     SHORT_BASE_NAME is `foo'.

 
 

-       /* JF write out the output file */
-  if (k == 0 && ftable)
+     The precise -o name will be used for FTABLE.  For other output
+     files, remove the ".c" or ".tab.c" suffix.  */
+  if (spec_outfile)

     {
     {

-      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);
-        }
+      filename_split (spec_outfile, &base, &tab, &ext);
+
+      /* The full base name goes up the EXT, excluding it. */
+      full_base_name =
+       xstrndup (spec_outfile,
+                 (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
+
+      /* The short base name goes up to TAB, excluding it.  */
+      short_base_name =
+       xstrndup (spec_outfile,
+                 (strlen (spec_outfile)
+                  - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
+
+      if (tab)
+       output_infix = xstrndup (tab,
+                                (strlen (tab) - (ext ? strlen (ext) : 0)));
+
+      if (ext)
+       compute_exts_from_src (ext);

     }
 
     }
 

-#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
-#ifdef MSDOS
-  if (actfile) unlink(actfile);
-  if (tmpattrsfile) unlink(tmpattrsfile);
-  if (tmptabfile) unlink(tmptabfile);
-  if (tmpdefsfile) unlink(tmpdefsfile);
-#endif /* MSDOS */
-  exit(k);
-#endif /* not VMS */
+  /* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
+     and SHORT_BASE_NAME = `foo'.
+
+     Construct names from it.  */
+  else
+    {
+      if (spec_file_prefix)
+       {
+         /* If --file-prefix=foo was specified, SHORT_BASE_NAME =
+            `foo'.  */
+         short_base_name = xstrdup (spec_file_prefix);
+       }
+      else if (yacc_flag)
+       {
+         /* If --yacc, then the output is `y.tab.c'. */
+         short_base_name = xstrdup ("y");
+       }
+      else
+       {
+         /* Otherwise, the short base name is computed from the input
+            grammar: `foo.yy' => `foo'.  */
+         filename_split (infile, &base, &tab, &ext);
+         short_base_name =
+           xstrndup (infile,
+                     (strlen (infile) - (ext ? strlen (ext) : 0)));
+       }
+
+      /* In these cases, always append `.tab'. */
+      output_infix = xstrdup (EXT_TAB);
+
+      full_base_name = XMALLOC (char,
+                               strlen (short_base_name)
+                               + strlen (EXT_TAB) + 1);
+      stpcpy (stpcpy (full_base_name, short_base_name), EXT_TAB);
+
+      /* Computes the extensions from the grammar file name.  */
+      filename_split (infile, &base, &tab, &ext);
+      if (ext && !yacc_flag)
+       compute_exts_from_gf (ext);
+    }
+}
+
+/*-------------------------------------------------------.
+| Close the open files, compute the output files names.  |
+`-------------------------------------------------------*/
+
+void
+compute_output_file_names (void)
+{
+  compute_base_names ();
+
+  /* If not yet done. */
+  if (!src_extension)
+    src_extension = ".c";
+  if (!header_extension)
+    header_extension = ".h";
+  
+  parser_file_name =
+    spec_outfile ? spec_outfile : stringappend (full_base_name, src_extension);
+  
+  /* It the defines filename if not given, we create it.  */
+  if (!spec_defines_file)
+    spec_defines_file = stringappend (full_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);

 }
 }