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 # include <ssdef.h>
  26 # define unlink delete
  27 # ifndef XPFILE
  28 #  define XPFILE "GNU_BISON:[000000]BISON.SIMPLE"
  29 # endif
  30 # ifndef XPFILE1
  31 #  define XPFILE1 "GNU_BISON:[000000]BISON.HAIRY"
  32 # endif
  33 #endif
  34
  35 #if defined (_MSC_VER)
  36 # ifndef XPFILE
  37 #  define XPFILE "c:/usr/local/lib/bison.simple"
  38 # endif
  39 # ifndef XPFILE1
  40 #  define XPFILE1 "c:/usr/local/lib/bison.hairy"
  41 # endif
  42 #endif
  43
  44 #include "getargs.h"
  45 #include "files.h"
  46 #include "xalloc.h"
  47 #include "gram.h"
  48 #include "complain.h"
  49
  50 FILE *finput = NULL;
  51 FILE *foutput = NULL;
  52 FILE *fguard = NULL;
  53 FILE *fparser = NULL;
  54
  55 struct obstack action_obstack;
  56 struct obstack attrs_obstack;
  57 struct obstack table_obstack;
  58 struct obstack defines_obstack;
  59
  60 /* File name specified with -o for the output file, or 0 if no -o.  */
  61 char *spec_outfile;
  62
  63 char *infile;
  64 char *attrsfile;
  65
  66 static char *outfile;
  67 static char *defsfile;
  68 static char *tabfile;
  69 static char *guardfile;
  70 static char *actfile;
  71
  72 extern char *getenv ();
  73
  74 extern char *program_name;
  75 \f
  76
  77 static char *
  78 stringappend (const char *string1, int end1, const char *string2)
  79 {
  80   register char *ostring;
  81   register char *cp;
  82   register const char *cp1;
  83   register int i;
  84
  85   cp1 = string2;
  86   i = 0;
  87   while (*cp1++)
  88     i++;
  89
  90   ostring = XCALLOC (char, i + end1 + 1);
  91
  92   cp = ostring;
  93   cp1 = string1;
  94   for (i = 0; i < end1; i++)
  95     *cp++ = *cp1++;
  96
  97   cp1 = string2;
  98   while ((*cp++ = *cp1++))
  99     ;
 100
 101   return ostring;
 102 }
 103
 104 /*-----------------------------------------------------------------.
 105 | Try to open file NAME with mode MODE, and print an error message |
 106 | if fails.                                                        |
 107 `-----------------------------------------------------------------*/
 108
 109 static FILE *
 110 xfopen (const char *name, const char *mode)
 111 {
 112   FILE *ptr;
 113
 114   ptr = fopen (name, mode);
 115   if (!ptr)
 116     error (2, errno, _("cannot open file `%s'"), name);
 117
 118   return ptr;
 119 }
 120
 121 /*-------------------------------------------------------------.
 122 | Try to close file PTR, and print an error message if fails.  |
 123 `-------------------------------------------------------------*/
 124
 125 static int
 126 xfclose (FILE *ptr)
 127 {
 128   int result;
 129
 130   if (ptr == NULL)
 131     return 0;
 132
 133   result = fclose (ptr);
 134   if (result == EOF)
 135     error (2, errno, _("cannot close file"));
 136
 137   return result;
 138 }
 139
 140 /*--------------------------------------------------.
 141 | Save the content of the obstack OBS in FILENAME.  |
 142 `--------------------------------------------------*/
 143
 144 void
 145 obstack_save (struct obstack *obs, const char *filename)
 146 {
 147   FILE *out = xfopen (filename, "w");
 148   size_t size = obstack_object_size (obs);
 149   fwrite (obstack_finish (obs), 1, size, out);
 150   xfclose (out);
 151 }
 152
 153 \f
 154 /*-----------------------------------------------------------------.
 155 | Open the input file.  Look for the skeletons.  Find the names of |
 156 | the output files.  Prepare the obstacks.                         |
 157 `-----------------------------------------------------------------*/
 158
 159 void
 160 open_files (void)
 161 {
 162   char *name_base;
 163 #ifdef MSDOS
 164   register char *cp;
 165 #endif
 166   char *filename;
 167   int base_length;
 168   int short_base_length;
 169
 170 #if defined (VMS) & !defined (__VMS_POSIX)
 171   const char *tmp_base = "sys$scratch:b_";
 172 #else
 173   const char *tmp_base = "/tmp/b.";
 174 #endif
 175   int tmp_len;
 176
 177 #ifdef MSDOS
 178   tmp_base = getenv ("TMP");
 179   if (tmp_base == 0)
 180     tmp_base = "";
 181   strlwr (infile);
 182 #endif /* MSDOS */
 183
 184 #if (defined(_WIN32) && !defined(__CYGWIN32__))
 185   tmp_base = getenv ("TEMP");   /* Windows95 defines this ... */
 186   if (tmp_base == 0)
 187     tmp_base = getenv ("Temp"); /* ... while NT prefers this */
 188   if (tmp_base == 0)
 189     tmp_base = "";
 190   strlwr (infile);
 191 #endif /* _WIN32 && !__CYGWIN32__ */
 192
 193 #if (defined(unix) || defined(__unix) || defined(__unix__) || defined(__EMX__))
 194   {
 195     char *tmp_ptr = getenv ("TMPDIR");
 196
 197     if (tmp_ptr != 0)
 198       tmp_base = stringappend (tmp_ptr, strlen (tmp_ptr), "/b.");
 199   }
 200 #endif /* unix || __unix || __unix__ */
 201
 202   tmp_len = strlen (tmp_base);
 203
 204   if (spec_outfile)
 205     {
 206       /* -o was specified.  The precise -o name will be used for FTABLE.
 207          For other output files, remove the ".c" or ".tab.c" suffix.  */
 208       name_base = spec_outfile;
 209 #ifdef MSDOS
 210       strlwr (name_base);
 211 #endif /* MSDOS */
 212       /* BASE_LENGTH includes ".tab" but not ".c".  */
 213       base_length = strlen (name_base);
 214       if (!strcmp (name_base + base_length - 2, ".c"))
 215         base_length -= 2;
 216       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 217       short_base_length = base_length;
 218       if (!strncmp (name_base + short_base_length - 4, ".tab", 4))
 219         short_base_length -= 4;
 220       else if (!strncmp (name_base + short_base_length - 4, "_tab", 4))
 221         short_base_length -= 4;
 222     }
 223   else if (spec_file_prefix)
 224     {
 225       /* -b was specified.  Construct names from it.  */
 226       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 227       short_base_length = strlen (spec_file_prefix);
 228       /* Count room for `.tab'.  */
 229       base_length = short_base_length + 4;
 230       name_base = XMALLOC (char, base_length + 1);
 231       /* Append `.tab'.  */
 232       strcpy (name_base, spec_file_prefix);
 233 #ifdef VMS
 234       strcat (name_base, "_tab");
 235 #else
 236       strcat (name_base, ".tab");
 237 #endif
 238 #ifdef MSDOS
 239       strlwr (name_base);
 240 #endif /* MSDOS */
 241     }
 242   else
 243     {
 244       /* -o was not specified; compute output file name from input
 245          or use y.tab.c, etc., if -y was specified.  */
 246
 247       static char FIXED_NAME_BASE[] = "y.y";
 248
 249       name_base = yacc_flag ? FIXED_NAME_BASE : infile;
 250
 251       /* BASE_LENGTH gets length of NAME_BASE, sans ".y" suffix if any.  */
 252
 253       base_length = strlen (name_base);
 254       if (!strcmp (name_base + base_length - 2, ".y"))
 255         base_length -= 2;
 256       short_base_length = base_length;
 257
 258 #ifdef VMS
 259       name_base = stringappend (name_base, short_base_length, "_tab");
 260 #else
 261 #ifdef MSDOS
 262       name_base = stringappend (name_base, short_base_length, "_tab");
 263 #else
 264       name_base = stringappend (name_base, short_base_length, ".tab");
 265 #endif /* not MSDOS */
 266 #endif
 267       base_length = short_base_length + 4;
 268     }
 269
 270   finput = xfopen (infile, "r");
 271
 272   if (!no_parser_flag)
 273     {
 274       filename = getenv ("BISON_SIMPLE");
 275 #ifdef MSDOS
 276       /* File doesn't exist in current directory; try in INIT directory.  */
 277       cp = getenv ("INIT");
 278       if (filename == 0 && cp != NULL)
 279         {
 280           filename = XMALLOC (char, strlen (cp) + strlen (PFILE) + 2);
 281           strcpy (filename, cp);
 282           cp = filename + strlen (filename);
 283           *cp++ = '/';
 284           strcpy (cp, PFILE);
 285         }
 286 #endif /* MSDOS */
 287       fparser = xfopen (filename ? filename : PFILE, "r");
 288     }
 289
 290   if (verbose_flag)
 291     {
 292 #ifdef MSDOS
 293       outfile = stringappend (name_base, short_base_length, ".out");
 294 #else
 295       /* We used to use just .out if spec_name_prefix (-p) was used,
 296          but that conflicts with Posix.  */
 297       outfile = stringappend (name_base, short_base_length, ".output");
 298 #endif
 299       foutput = xfopen (outfile, "w");
 300     }
 301
 302   if (no_parser_flag)
 303     {
 304       /* use permanent name for actions file */
 305       actfile = stringappend (name_base, short_base_length, ".act");
 306     }
 307
 308   if (defines_flag)
 309     {
 310       defsfile = stringappend (name_base, base_length, ".h");
 311     }
 312
 313   /* These are opened by `done' or `open_extra_files', if at all */
 314   if (spec_outfile)
 315     tabfile = spec_outfile;
 316   else
 317     tabfile = stringappend (name_base, base_length, ".c");
 318
 319 #ifdef VMS
 320   attrsfile = stringappend (name_base, short_base_length, "_stype.h");
 321   guardfile = stringappend (name_base, short_base_length, "_guard.c");
 322 #else
 323 #ifdef MSDOS
 324   attrsfile = stringappend (name_base, short_base_length, ".sth");
 325   guardfile = stringappend (name_base, short_base_length, ".guc");
 326 #else
 327   attrsfile = stringappend (name_base, short_base_length, ".stype.h");
 328   guardfile = stringappend (name_base, short_base_length, ".guard.c");
 329 #endif /* not MSDOS */
 330 #endif /* not VMS */
 331
 332   /* Initialize the obstacks. */
 333   obstack_init (&action_obstack);
 334   obstack_init (&attrs_obstack);
 335   obstack_init (&table_obstack);
 336   obstack_init (&defines_obstack);
 337 }
 338
 339
 340
 341 /*--------------------------------------------------------------------.
 342 | Open the output files needed only for the semantic parser.  This    |
 343 | is done when %semantic_parser is seen in the declarations section.  |
 344 `--------------------------------------------------------------------*/
 345
 346 void
 347 open_extra_files (void)
 348 {
 349   int c;
 350   char *filename;
 351
 352   xfclose (fparser);
 353
 354   if (!no_parser_flag)
 355     {
 356       filename = (char *) getenv ("BISON_HAIRY");
 357 #ifdef MSDOS
 358       {
 359         /* File doesn't exist in current directory; try in INIT
 360            directory.  */
 361         char *cp = getenv ("INIT");
 362         if (filename == 0 && cp != NULL)
 363           {
 364             filename = XMALLOC (char, strlen (cp) + strlen (PFILE1) + 2);
 365             strcpy (filename, cp);
 366             cp = filename + strlen (filename);
 367             *cp++ = '/';
 368             strcpy (cp, PFILE1);
 369           }
 370       }
 371 #endif
 372       fparser = xfopen (filename ? filename : PFILE1, "r");
 373     }
 374
 375   fguard = xfopen (guardfile, "w");
 376 }
 377
 378
 379 /*-----------------------------------------------------.
 380 | Close the open files, produce all the output files.  |
 381 `-----------------------------------------------------*/
 382
 383 void
 384 output_files (void)
 385 {
 386   xfclose (fguard);
 387   xfclose (finput);
 388   xfclose (fparser);
 389   xfclose (foutput);
 390
 391   /* Output the main file.  */
 392   obstack_save (&table_obstack, tabfile);
 393
 394   /* Output the header file if wanted. */
 395   if (defines_flag)
 396     obstack_save (&defines_obstack, defsfile);
 397
 398   /* If we output only the table, dump the actions in ACTFILE.
 399      */
 400   if (no_parser_flag)
 401     obstack_save (&action_obstack, actfile);
 402
 403   /* If we produced a semantic parser ATTRS_OBSTACK must be dumped
 404      into its own file, ATTTRSFILE.  */
 405   if (semantic_parser)
 406     obstack_save (&attrs_obstack, attrsfile);
 407 }