src/files.c

   1 /* Open and close files for bison,
   2    Copyright 1984, 1986, 1989, 1992, 2000 Free Software Foundation, Inc.
   3
   4    This file is part of Bison, the GNU Compiler Compiler.
   5
   6    Bison is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    Bison is distributed in the hope that it will be useful, but
  12    WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with Bison; see the file COPYING.  If not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19    02111-1307, USA.  */
  20
  21
  22 #include "system.h"
  23
  24 #if defined (VMS) & !defined (__VMS_POSIX)
  25 # ifndef BISON_SIMPLE
  26 #  define BISON_SIMPLE "GNU_BISON:[000000]BISON.SIMPLE"
  27 # endif
  28 # ifndef BISON_HAIRY
  29 #  define BISON_HARIRY "GNU_BISON:[000000]BISON.HAIRY"
  30 # endif
  31 #endif
  32
  33 #if defined (_MSC_VER)
  34 # ifndef BISON_SIMPLE
  35 #  define BISON_SIMPLE "c:/usr/local/lib/bison.simple"
  36 # endif
  37 # ifndef BISON_HAIRY
  38 #  define BISON_HAIRY "c:/usr/local/lib/bison.hairy"
  39 # endif
  40 #endif
  41
  42 #include "getargs.h"
  43 #include "files.h"
  44 #include "xalloc.h"
  45 #include "gram.h"
  46 #include "complain.h"
  47
  48 FILE *finput = NULL;
  49 FILE *foutput = NULL;
  50 FILE *fguard = NULL;
  51 FILE *fparser = NULL;
  52
  53 struct obstack action_obstack;
  54 struct obstack attrs_obstack;
  55 struct obstack table_obstack;
  56 struct obstack defines_obstack;
  57
  58 /* File name specified with -o for the output file, or 0 if no -o.  */
  59 char *spec_outfile;
  60
  61 char *infile;
  62 char *attrsfile;
  63
  64 static char *outfile;
  65 static char *defsfile;
  66 static char *tabfile;
  67 static char *guardfile;
  68 static char *actfile;
  69 \f
  70 /*-----------------------------------------------------------------.
  71 | Return a newly allocated string composed of the concatenation of |
  72 | the END1 first chars of STRING1, and STRING2.                    |
  73 `-----------------------------------------------------------------*/
  74
  75 static char *
  76 stringappend (const char *string1, int end1, const char *string2)
  77 {
  78   char *res;
  79   char *cp;
  80   const char *cp1;
  81   int i;
  82
  83   cp1 = string2;
  84   i = 0;
  85   while (*cp1++)
  86     i++;
  87
  88   res = XCALLOC (char, i + end1 + 1);
  89
  90   cp = res;
  91   cp1 = string1;
  92   for (i = 0; i < end1; i++)
  93     *cp++ = *cp1++;
  94
  95   cp1 = string2;
  96   while ((*cp++ = *cp1++))
  97     ;
  98
  99   return res;
 100 }
 101
 102 /*-----------------------------------------------------------------.
 103 | Try to open file NAME with mode MODE, and print an error message |
 104 | if fails.                                                        |
 105 `-----------------------------------------------------------------*/
 106
 107 static FILE *
 108 xfopen (const char *name, const char *mode)
 109 {
 110   FILE *ptr;
 111
 112   ptr = fopen (name, mode);
 113   if (!ptr)
 114     error (2, errno, _("cannot open file `%s'"), name);
 115
 116   return ptr;
 117 }
 118
 119 /*-------------------------------------------------------------.
 120 | Try to close file PTR, and print an error message if fails.  |
 121 `-------------------------------------------------------------*/
 122
 123 static int
 124 xfclose (FILE *ptr)
 125 {
 126   int result;
 127
 128   if (ptr == NULL)
 129     return 0;
 130
 131   result = fclose (ptr);
 132   if (result == EOF)
 133     error (2, errno, _("cannot close file"));
 134
 135   return result;
 136 }
 137
 138 /*--------------------------------------------------.
 139 | Save the content of the obstack OBS in FILENAME.  |
 140 `--------------------------------------------------*/
 141
 142 static void
 143 obstack_save (struct obstack *obs, const char *filename)
 144 {
 145   FILE *out = xfopen (filename, "w");
 146   size_t size = obstack_object_size (obs);
 147   fwrite (obstack_finish (obs), 1, size, out);
 148   xfclose (out);
 149 }
 150
 151
 152 static const char *
 153 skeleton_find (const char *envvar, const char *skeleton)
 154 {
 155   const char *res = getenv (envvar);
 156
 157 #ifdef MSDOS
 158   const char *cp;
 159
 160   /* File doesn't exist in current directory; try in INIT directory.  */
 161   if (!res && (cp = getenv ("INIT")))
 162     {
 163       res = XMALLOC (char, strlen (cp) + strlen (skeleton) + 2);
 164       sprintf (res, "%s%c%s", cp, '/', skeleton);
 165     }
 166 #endif /* !MSDOS */
 167
 168   if (!res)
 169     res = skeleton;
 170
 171   return res;
 172 }
 173
 174 \f
 175 /*-----------------------------------------------------------------.
 176 | Open the input file.  Look for the skeletons.  Find the names of |
 177 | the output files.  Prepare the obstacks.                         |
 178 `-----------------------------------------------------------------*/
 179
 180 void
 181 open_files (void)
 182 {
 183   char *name_base;
 184 #ifdef MSDOS
 185   register char *cp;
 186 #endif
 187   int base_length;
 188   int short_base_length;
 189
 190   if (spec_outfile)
 191     {
 192       /* -o was specified.  The precise -o name will be used for FTABLE.
 193          For other output files, remove the ".c" or ".tab.c" suffix.  */
 194       name_base = spec_outfile;
 195 #ifdef MSDOS
 196       strlwr (name_base);
 197 #endif /* MSDOS */
 198       /* BASE_LENGTH includes ".tab" but not ".c".  */
 199       base_length = strlen (name_base);
 200       if (!strcmp (name_base + base_length - 2, ".c"))
 201         base_length -= 2;
 202       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 203       short_base_length = base_length;
 204       if (!strncmp (name_base + short_base_length - 4, ".tab", 4))
 205         short_base_length -= 4;
 206       else if (!strncmp (name_base + short_base_length - 4, "_tab", 4))
 207         short_base_length -= 4;
 208     }
 209   else if (spec_file_prefix)
 210     {
 211       /* -b was specified.  Construct names from it.  */
 212       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 213       short_base_length = strlen (spec_file_prefix);
 214       /* Count room for `.tab'.  */
 215       base_length = short_base_length + 4;
 216       name_base = XMALLOC (char, base_length + 1);
 217       /* Append `.tab'.  */
 218       strcpy (name_base, spec_file_prefix);
 219       strcat (name_base, EXT_TAB);
 220 #ifdef MSDOS
 221       strlwr (name_base);
 222 #endif /* MSDOS */
 223     }
 224   else
 225     {
 226       /* -o was not specified; compute output file name from input
 227          or use y.tab.c, etc., if -y was specified.  */
 228
 229       static char FIXED_NAME_BASE[] = "y.y";
 230
 231       name_base = yacc_flag ? FIXED_NAME_BASE : infile;
 232
 233       /* BASE_LENGTH gets length of NAME_BASE, sans ".y" suffix if any.  */
 234
 235       base_length = strlen (name_base);
 236       if (!strcmp (name_base + base_length - 2, ".y"))
 237         base_length -= 2;
 238       short_base_length = base_length;
 239
 240       name_base = stringappend (name_base, short_base_length, EXT_TAB);
 241       base_length = short_base_length + 4;
 242     }
 243
 244   finput = xfopen (infile, "r");
 245
 246   if (!no_parser_flag)
 247     fparser = xfopen (skeleton_find ("BISON_SIMPLE", BISON_SIMPLE), "r");
 248
 249   if (verbose_flag)
 250     {
 251       /* We used to use just .out if spec_name_prefix (-p) was used,
 252          but that conflicts with Posix.  */
 253       outfile = stringappend (name_base, short_base_length, EXT_OUTPUT);
 254       foutput = xfopen (outfile, "w");
 255     }
 256
 257   if (no_parser_flag)
 258     {
 259       /* use permanent name for actions file */
 260       actfile = stringappend (name_base, short_base_length, ".act");
 261     }
 262
 263   if (defines_flag)
 264     {
 265       defsfile = stringappend (name_base, base_length, ".h");
 266     }
 267
 268   /* These are opened by `done' or `open_extra_files', if at all */
 269   if (spec_outfile)
 270     tabfile = spec_outfile;
 271   else
 272     tabfile = stringappend (name_base, base_length, ".c");
 273
 274   attrsfile = stringappend (name_base, short_base_length, EXT_STYPE_H);
 275   guardfile = stringappend (name_base, short_base_length, EXT_GUARD_C);
 276
 277   /* Initialize the obstacks. */
 278   obstack_init (&action_obstack);
 279   obstack_init (&attrs_obstack);
 280   obstack_init (&table_obstack);
 281   obstack_init (&defines_obstack);
 282 }
 283
 284
 285
 286 /*--------------------------------------------------------------------.
 287 | Open the output files needed only for the semantic parser.  This    |
 288 | is done when %semantic_parser is seen in the declarations section.  |
 289 `--------------------------------------------------------------------*/
 290
 291 void
 292 open_extra_files (void)
 293 {
 294   xfclose (fparser);
 295
 296   if (!no_parser_flag)
 297     fparser = xfopen (skeleton_find ("BISON_HAIRY", BISON_HAIRY), "r");
 298   fguard = xfopen (guardfile, "w");
 299 }
 300
 301
 302 /*-----------------------------------------------------.
 303 | Close the open files, produce all the output files.  |
 304 `-----------------------------------------------------*/
 305
 306 void
 307 output_files (void)
 308 {
 309   xfclose (fguard);
 310   xfclose (finput);
 311   xfclose (fparser);
 312   xfclose (foutput);
 313
 314   /* Output the main file.  */
 315   obstack_save (&table_obstack, tabfile);
 316
 317   /* Output the header file if wanted. */
 318   if (defines_flag)
 319     obstack_save (&defines_obstack, defsfile);
 320
 321   /* If we output only the table, dump the actions in ACTFILE.
 322      */
 323   if (no_parser_flag)
 324     obstack_save (&action_obstack, actfile);
 325
 326   /* If we produced a semantic parser ATTRS_OBSTACK must be dumped
 327      into its own file, ATTTRSFILE.  */
 328   if (semantic_parser)
 329     obstack_save (&attrs_obstack, attrsfile);
 330 }