src/files.c

   1 /* Open and close files for bison,
   2    Copyright 1984, 1986, 1989, 1992, 2000, 2001 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 #include "getargs.h"
  24 #include "files.h"
  25 #include "xalloc.h"
  26 #include "gram.h"
  27 #include "complain.h"
  28
  29 FILE *finput = NULL;
  30
  31 struct obstack action_obstack;
  32 struct obstack attrs_obstack;
  33 struct obstack table_obstack;
  34 struct obstack defines_obstack;
  35 struct obstack guard_obstack;
  36 struct obstack output_obstack;
  37 struct obstack graph_obstack;
  38
  39 char *spec_outfile = NULL;      /* for -o. */
  40 char *spec_file_prefix = NULL;  /* for -b. */
  41 char *spec_name_prefix = NULL;  /* for -p. */
  42
  43 char *infile = NULL;
  44 char *attrsfile = NULL;
  45
  46 static char *base_name = NULL;
  47 static char *short_base_name = NULL;
  48
  49 /* C source file extension (the parser source).  */
  50 const char *src_extension = NULL;
  51 /* Header file extension (if option ``-d'' is specified).  */
  52 const char *header_extension = NULL;
  53 \f
  54
  55 /*--------------------------.
  56 | Is SUFFIX ending STRING?  |
  57 `--------------------------*/
  58
  59 static int
  60 strsuffix (const char *string, const char *suffix)
  61 {
  62   size_t string_len = strlen (string);
  63   size_t suffix_len = strlen (suffix);
  64   if (suffix_len <= string_len)
  65     return !strcmp (string + string_len - suffix_len, suffix);
  66   else
  67     return 0;
  68 }
  69
  70
  71 /*-----------------------------------------------------------------.
  72 | Return a newly allocated string composed of the concatenation of |
  73 | STRING1, and STRING2.                                            |
  74 `-----------------------------------------------------------------*/
  75
  76 static char *
  77 stringappend (const char *string1, const char *string2)
  78 {
  79   size_t len = strlen (string1) + strlen (string2);
  80   char *res = XMALLOC (char, len + 1);
  81   char *cp;
  82   cp = stpcpy (res, string1);
  83   cp = stpcpy (cp, string2);
  84   return res;
  85 }
  86
  87 /*-----------------------------------------------------------------.
  88 | Try to open file NAME with mode MODE, and print an error message |
  89 | if fails.                                                        |
  90 `-----------------------------------------------------------------*/
  91
  92 FILE *
  93 xfopen (const char *name, const char *mode)
  94 {
  95   FILE *ptr;
  96
  97   ptr = fopen (name, mode);
  98   if (!ptr)
  99     error (2, errno, _("cannot open file `%s'"), name);
 100
 101   return ptr;
 102 }
 103
 104 /*-------------------------------------------------------------.
 105 | Try to close file PTR, and print an error message if fails.  |
 106 `-------------------------------------------------------------*/
 107
 108 int
 109 xfclose (FILE *ptr)
 110 {
 111   int result;
 112
 113   if (ptr == NULL)
 114     return 0;
 115
 116   result = fclose (ptr);
 117   if (result == EOF)
 118     error (2, errno, _("cannot close file"));
 119
 120   return result;
 121 }
 122
 123 /*--------------------------------------------------.
 124 | Save the content of the obstack OBS in FILENAME.  |
 125 `--------------------------------------------------*/
 126
 127 static void
 128 obstack_save (struct obstack *obs, const char *filename)
 129 {
 130   FILE *out = xfopen (filename, "w");
 131   size_t size = obstack_object_size (obs);
 132   fwrite (obstack_finish (obs), 1, size, out);
 133   xfclose (out);
 134 }
 135
 136
 137 /*------------------------------------------------------------------.
 138 | Return the path to the skeleton which locaction might be given in |
 139 | ENVVAR, otherwise return SKELETON_NAME.                           |
 140 `------------------------------------------------------------------*/
 141
 142 const char *
 143 skeleton_find (const char *envvar, const char *skeleton_name)
 144 {
 145   const char *res = getenv (envvar);
 146
 147 #ifdef MSDOS
 148   const char *cp;
 149
 150   /* File doesn't exist in current directory; try in INIT directory.  */
 151   if (!res && (cp = getenv ("INIT")))
 152     {
 153       res = XMALLOC (char, strlen (cp) + strlen (skeleton_name) + 2);
 154       sprintf (res, "%s%c%s", cp, '/', skeleton_name);
 155     }
 156 #endif /* !MSDOS */
 157
 158   if (!res)
 159     res = skeleton_name;
 160
 161   return res;
 162 }
 163 \f
 164
 165 /*----------------------------------------------------------------.
 166 | Compute BASE_NAME, SHORT_BASE_NAME and output files extensions. |
 167 `----------------------------------------------------------------*/
 168
 169 /* Replace all characters FROM by TO in the string IN.
 170    and returns a new allocated string.  */
 171 static char *
 172 tr (const char *in, char from, char to)
 173 {
 174   char *temp;
 175   char *out;
 176
 177   out = XMALLOC (char, strlen (in) + 1);
 178
 179   for (temp = out; *in; in++, out++)
 180     if (*in == from)
 181       *out = to;
 182     else
 183       *out = *in;
 184   *out = 0;
 185   return (temp);
 186 }
 187
 188 /* Gets the extension index in FILENAME. Returns 0 if fails to
 189    find an extension.  */
 190 static int
 191 get_extension_index (const char *filename)
 192 {
 193   int len;
 194
 195   len = strlen (filename);
 196
 197   if (filename[len-- - 1] == '.')
 198     return (0);
 199
 200   while ((len > 0) && (filename[len - 1] != '.'))
 201     if (filename[len - 1] == '/')
 202       return (0);
 203     else
 204       len--;
 205
 206   return (len - 1);
 207 }
 208
 209 /* Computes extensions from the grammar file extension. */
 210 static void
 211 compute_exts_from_gf (const char *ext)
 212 {
 213   /* Checks if SRC_EXTENSION is NULL. In the other case, %source_extension
 214      was specified in the grammar file.  */
 215   if (src_extension == NULL)
 216     {
 217       src_extension = tr (ext, 'y', 'c');
 218       src_extension = tr (src_extension, 'Y', 'C');
 219     }
 220   /* Checks if HEADER_EXTENSION is NULL. In the other case,
 221      %header_extension was specified in the grammar file.  */
 222   if (header_extension == NULL)
 223     {
 224       header_extension = tr (ext, 'y', 'h');
 225       header_extension = tr (header_extension, 'Y', 'H');
 226     }
 227 }
 228
 229 /* Computes extensions from the given c source file extension. */
 230 static void
 231 compute_exts_from_src (const char *ext)
 232 {
 233   /* We use this function when the user specifies `-o' or `--output',
 234      so the extenions must be computed unconditionally from the file name
 235      given by this option.  */
 236   src_extension = xstrdup (ext);
 237   header_extension = tr (ext, 'c', 'h');
 238   header_extension = tr (header_extension, 'C', 'H');
 239 }
 240
 241 /* FIXME: Should use xstrndup. */
 242
 243 static void
 244 compute_base_names (void)
 245 {
 246   size_t base_length;
 247   size_t short_base_length;
 248   size_t ext_index;
 249
 250   /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
 251      BASE_NAME and SHORT_BASE_NAME are `foo'.
 252
 253      If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
 254      SHORT_BASE_NAME is `foo'.
 255
 256      The precise -o name will be used for FTABLE.  For other output
 257      files, remove the ".c" or ".tab.c" suffix.  */
 258   if (spec_outfile)
 259     {
 260 #ifdef MSDOS
 261       strlwr (spec_outfile);
 262 #endif /* MSDOS */
 263       /* BASE_LENGTH includes ".tab" but not ".c".  */
 264       base_length = strlen (spec_outfile);
 265
 266       ext_index = get_extension_index (spec_outfile);
 267       /* If the initial segment of extension contains 'c' or a 'C', I assume
 268          that it is a C or C++ source file.  */
 269       if (ext_index)
 270         ext_index =
 271           (strspn (spec_outfile + ext_index + 1, "cC")) ? ext_index : 0;
 272       if (ext_index)
 273         {
 274           base_length -= strlen (spec_outfile + ext_index);
 275           compute_exts_from_src (spec_outfile + ext_index);
 276         }
 277
 278       base_name = strndup (spec_outfile, base_length);
 279       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 280       short_base_length = base_length;
 281       if (strsuffix (base_name, ".tab") || strsuffix (base_name, "_tab"))
 282         short_base_length -= 4;
 283       short_base_name = strndup (spec_outfile, short_base_length);
 284
 285       return;
 286     }
 287
 288   /* If --file-prefix=foo was specified, BASE_NAME and SHORT_BASE_NAME
 289      are `foo'.
 290
 291      Construct names from it.  */
 292   if (spec_file_prefix)
 293     {
 294 #ifdef MSDOS
 295       strlwr (spec_file_prefix);
 296 #endif /* MSDOS */
 297       short_base_name = xstrdup (spec_file_prefix);
 298       base_name = XMALLOC (char,
 299                            strlen (short_base_name) + strlen (EXT_TAB) + 1);
 300       stpcpy (stpcpy (base_name, short_base_name), EXT_TAB);
 301
 302       /* Computes the extensions from the garmmar file name.  */
 303       ext_index = get_extension_index (infile);
 304       /* If the initial segment of extension contains a 'y' or a 'Y', I assume
 305          that it is a yacc or bison grammar file.  */
 306       if (ext_index)
 307         ext_index = (strspn (infile + ext_index + 1, "yY")) ? ext_index : 0;
 308       if (ext_index)
 309         compute_exts_from_gf (infile + ext_index);
 310
 311       return;
 312     }
 313
 314   /* If neither -o nor --file-prefix were specified, and the input
 315      file is foo.y, BASE_NAME is `foo.tab', and SHORT_BASE_NAME is
 316      `foo'.
 317
 318      If --yacc is used, do as if the input file was `y.y'.  */
 319   {
 320     const char *name_base = yacc_flag ? "y.y" : infile;
 321
 322     /* BASE_LENGTH gets length of BASE_NAME, sans ".y" suffix if any.  */
 323
 324     base_length = strlen (name_base);
 325
 326     ext_index = get_extension_index (name_base);
 327     /* If the initial segment of extension contains a 'y' or a 'Y', I assume
 328        that it is a yacc or bison grammar file.  */
 329     if (ext_index)
 330       ext_index = (strspn (name_base + ext_index + 1, "yY")) ? ext_index : 0;
 331     if (ext_index)
 332       {
 333         base_length -= strlen (name_base + ext_index);
 334         compute_exts_from_gf (name_base + ext_index);
 335       }
 336
 337     short_base_length = base_length;
 338     short_base_name = strndup (name_base, short_base_length);
 339
 340     base_name = XMALLOC (char,
 341                          strlen (short_base_name) + strlen (EXT_TAB) + 1);
 342     stpcpy (stpcpy (base_name, short_base_name), EXT_TAB);
 343
 344     return;
 345   }
 346 }
 347
 348 /*-----------------------------------------------------------------.
 349 | Open the input file.  Look for the skeletons.  Find the names of |
 350 | the output files.  Prepare the obstacks.                         |
 351 `-----------------------------------------------------------------*/
 352
 353 void
 354 open_files (void)
 355 {
 356   finput = xfopen (infile, "r");
 357
 358   /* Initialize the obstacks. */
 359   obstack_init (&action_obstack);
 360   obstack_init (&attrs_obstack);
 361   obstack_init (&table_obstack);
 362   obstack_init (&defines_obstack);
 363   obstack_init (&guard_obstack);
 364   obstack_init (&output_obstack);
 365   obstack_init (&graph_obstack);
 366 }
 367
 368
 369
 370 /*-----------------------------------------------------.
 371 | Close the open files, produce all the output files.  |
 372 `-----------------------------------------------------*/
 373
 374 void
 375 output_files (void)
 376 {
 377   xfclose (finput);
 378
 379   compute_base_names ();
 380
 381   /* Set default extensions */
 382   if (!src_extension)
 383     src_extension = ".c";
 384   if (!header_extension)
 385     header_extension = ".h";
 386
 387   attrsfile = stringappend (short_base_name, EXT_STYPE_H);
 388 #ifndef MSDOS
 389   stringappend (attrsfile, header_extension);
 390 #endif /* MSDOS */
 391
 392   /* Output the main file.  */
 393   if (spec_outfile)
 394     obstack_save (&table_obstack, spec_outfile);
 395   else
 396     obstack_save (&table_obstack, stringappend (base_name, src_extension));
 397
 398   /* Output the header file if wanted. */
 399   if (defines_flag)
 400     obstack_save (&defines_obstack,
 401                   stringappend (base_name, header_extension));
 402
 403   /* If we output only the table, dump the actions in ACTFILE. */
 404   if (no_parser_flag)
 405     obstack_save (&action_obstack, stringappend (short_base_name, ".act"));
 406
 407   /* If we produced a semantic parser ATTRS_OBSTACK must be dumped
 408      into its own file, ATTTRSFILE.  */
 409   if (semantic_parser)
 410     {
 411       char *temp_name;
 412
 413       obstack_save (&attrs_obstack, attrsfile);
 414       temp_name = stringappend (short_base_name, EXT_GUARD_C);
 415 #ifndef MSDOS
 416       temp_name = stringappend (temp_name, src_extension);
 417 #endif /* MSDOS */
 418       obstack_save (&guard_obstack, temp_name);
 419     }
 420
 421   if (verbose_flag)
 422     /* We used to use just .out if spec_name_prefix (-p) was used, but
 423        that conflicts with Posix.  */
 424     obstack_save (&output_obstack,
 425                   stringappend (short_base_name, EXT_OUTPUT));
 426
 427   if (graph_flag)
 428     obstack_save (&graph_obstack, stringappend (short_base_name, ".vcg"));
 429 }