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 static 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
 154 static const char *
 155 skeleton_find (const char *envvar, const char *skeleton)
 156 {
 157   const char *res = getenv (envvar);
 158
 159 #ifdef MSDOS
 160   const char *cp;
 161
 162   /* File doesn't exist in current directory; try in INIT directory.  */
 163   if (!res && (cp = getenv ("INIT")))
 164     {
 165       res = XMALLOC (char, strlen (cp) + strlen (skeleton) + 2);
 166       sprintf (res, "%s%c%s", cp, '/', skeleton);
 167     }
 168 #endif /* !MSDOS */
 169
 170   if (!res)
 171     res = skeleton;
 172
 173   return res;
 174 }
 175
 176 \f
 177 /*-----------------------------------------------------------------.
 178 | Open the input file.  Look for the skeletons.  Find the names of |
 179 | the output files.  Prepare the obstacks.                         |
 180 `-----------------------------------------------------------------*/
 181
 182 void
 183 open_files (void)
 184 {
 185   char *name_base;
 186 #ifdef MSDOS
 187   register char *cp;
 188 #endif
 189   int base_length;
 190   int short_base_length;
 191
 192 #if defined (VMS) & !defined (__VMS_POSIX)
 193   const char *tmp_base = "sys$scratch:b_";
 194 #else
 195   const char *tmp_base = "/tmp/b.";
 196 #endif
 197   int tmp_len;
 198
 199 #ifdef MSDOS
 200   tmp_base = getenv ("TMP");
 201   if (tmp_base == 0)
 202     tmp_base = "";
 203   strlwr (infile);
 204 #endif /* MSDOS */
 205
 206 #if (defined(_WIN32) && !defined(__CYGWIN32__))
 207   tmp_base = getenv ("TEMP");   /* Windows95 defines this ... */
 208   if (tmp_base == 0)
 209     tmp_base = getenv ("Temp"); /* ... while NT prefers this */
 210   if (tmp_base == 0)
 211     tmp_base = "";
 212   strlwr (infile);
 213 #endif /* _WIN32 && !__CYGWIN32__ */
 214
 215 #if (defined(unix) || defined(__unix) || defined(__unix__) || defined(__EMX__))
 216   {
 217     char *tmp_ptr = getenv ("TMPDIR");
 218
 219     if (tmp_ptr != 0)
 220       tmp_base = stringappend (tmp_ptr, strlen (tmp_ptr), "/b.");
 221   }
 222 #endif /* unix || __unix || __unix__ */
 223
 224   tmp_len = strlen (tmp_base);
 225
 226   if (spec_outfile)
 227     {
 228       /* -o was specified.  The precise -o name will be used for FTABLE.
 229          For other output files, remove the ".c" or ".tab.c" suffix.  */
 230       name_base = spec_outfile;
 231 #ifdef MSDOS
 232       strlwr (name_base);
 233 #endif /* MSDOS */
 234       /* BASE_LENGTH includes ".tab" but not ".c".  */
 235       base_length = strlen (name_base);
 236       if (!strcmp (name_base + base_length - 2, ".c"))
 237         base_length -= 2;
 238       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 239       short_base_length = base_length;
 240       if (!strncmp (name_base + short_base_length - 4, ".tab", 4))
 241         short_base_length -= 4;
 242       else if (!strncmp (name_base + short_base_length - 4, "_tab", 4))
 243         short_base_length -= 4;
 244     }
 245   else if (spec_file_prefix)
 246     {
 247       /* -b was specified.  Construct names from it.  */
 248       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 249       short_base_length = strlen (spec_file_prefix);
 250       /* Count room for `.tab'.  */
 251       base_length = short_base_length + 4;
 252       name_base = XMALLOC (char, base_length + 1);
 253       /* Append `.tab'.  */
 254       strcpy (name_base, spec_file_prefix);
 255 #ifdef VMS
 256       strcat (name_base, "_tab");
 257 #else
 258       strcat (name_base, ".tab");
 259 #endif
 260 #ifdef MSDOS
 261       strlwr (name_base);
 262 #endif /* MSDOS */
 263     }
 264   else
 265     {
 266       /* -o was not specified; compute output file name from input
 267          or use y.tab.c, etc., if -y was specified.  */
 268
 269       static char FIXED_NAME_BASE[] = "y.y";
 270
 271       name_base = yacc_flag ? FIXED_NAME_BASE : infile;
 272
 273       /* BASE_LENGTH gets length of NAME_BASE, sans ".y" suffix if any.  */
 274
 275       base_length = strlen (name_base);
 276       if (!strcmp (name_base + base_length - 2, ".y"))
 277         base_length -= 2;
 278       short_base_length = base_length;
 279
 280 #ifdef VMS
 281       name_base = stringappend (name_base, short_base_length, "_tab");
 282 #else
 283 #ifdef MSDOS
 284       name_base = stringappend (name_base, short_base_length, "_tab");
 285 #else
 286       name_base = stringappend (name_base, short_base_length, ".tab");
 287 #endif /* not MSDOS */
 288 #endif
 289       base_length = short_base_length + 4;
 290     }
 291
 292   finput = xfopen (infile, "r");
 293
 294   if (!no_parser_flag)
 295     fparser = xfopen (skeleton_find ("BISON_SIMPLE", PFILE), "r");
 296
 297   if (verbose_flag)
 298     {
 299 #ifdef MSDOS
 300       outfile = stringappend (name_base, short_base_length, ".out");
 301 #else
 302       /* We used to use just .out if spec_name_prefix (-p) was used,
 303          but that conflicts with Posix.  */
 304       outfile = stringappend (name_base, short_base_length, ".output");
 305 #endif
 306       foutput = xfopen (outfile, "w");
 307     }
 308
 309   if (no_parser_flag)
 310     {
 311       /* use permanent name for actions file */
 312       actfile = stringappend (name_base, short_base_length, ".act");
 313     }
 314
 315   if (defines_flag)
 316     {
 317       defsfile = stringappend (name_base, base_length, ".h");
 318     }
 319
 320   /* These are opened by `done' or `open_extra_files', if at all */
 321   if (spec_outfile)
 322     tabfile = spec_outfile;
 323   else
 324     tabfile = stringappend (name_base, base_length, ".c");
 325
 326 #ifdef VMS
 327   attrsfile = stringappend (name_base, short_base_length, "_stype.h");
 328   guardfile = stringappend (name_base, short_base_length, "_guard.c");
 329 #else
 330 #ifdef MSDOS
 331   attrsfile = stringappend (name_base, short_base_length, ".sth");
 332   guardfile = stringappend (name_base, short_base_length, ".guc");
 333 #else
 334   attrsfile = stringappend (name_base, short_base_length, ".stype.h");
 335   guardfile = stringappend (name_base, short_base_length, ".guard.c");
 336 #endif /* not MSDOS */
 337 #endif /* not VMS */
 338
 339   /* Initialize the obstacks. */
 340   obstack_init (&action_obstack);
 341   obstack_init (&attrs_obstack);
 342   obstack_init (&table_obstack);
 343   obstack_init (&defines_obstack);
 344 }
 345
 346
 347
 348 /*--------------------------------------------------------------------.
 349 | Open the output files needed only for the semantic parser.  This    |
 350 | is done when %semantic_parser is seen in the declarations section.  |
 351 `--------------------------------------------------------------------*/
 352
 353 void
 354 open_extra_files (void)
 355 {
 356   xfclose (fparser);
 357
 358   if (!no_parser_flag)
 359     fparser = xfopen (skeleton_find ("BISON_HAIRY", PFILE1), "r");
 360   fguard = xfopen (guardfile, "w");
 361 }
 362
 363
 364 /*-----------------------------------------------------.
 365 | Close the open files, produce all the output files.  |
 366 `-----------------------------------------------------*/
 367
 368 void
 369 output_files (void)
 370 {
 371   xfclose (fguard);
 372   xfclose (finput);
 373   xfclose (fparser);
 374   xfclose (foutput);
 375
 376   /* Output the main file.  */
 377   obstack_save (&table_obstack, tabfile);
 378
 379   /* Output the header file if wanted. */
 380   if (defines_flag)
 381     obstack_save (&defines_obstack, defsfile);
 382
 383   /* If we output only the table, dump the actions in ACTFILE.
 384      */
 385   if (no_parser_flag)
 386     obstack_save (&action_obstack, actfile);
 387
 388   /* If we produced a semantic parser ATTRS_OBSTACK must be dumped
 389      into its own file, ATTTRSFILE.  */
 390   if (semantic_parser)
 391     obstack_save (&attrs_obstack, attrsfile);
 392 }