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 #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 FILE *foutput = NULL;
  31 FILE *fguard = NULL;
  32 FILE *fparser = NULL;
  33
  34 struct obstack action_obstack;
  35 struct obstack attrs_obstack;
  36 struct obstack table_obstack;
  37 struct obstack defines_obstack;
  38
  39 /* File name specified with -o for the output file, or 0 if no -o.  */
  40 char *spec_outfile;
  41
  42 char *infile;
  43 char *attrsfile;
  44
  45 static char *outfile;
  46 static char *defsfile;
  47 static char *tabfile;
  48 static char *guardfile;
  49 static char *actfile;
  50 \f
  51 /*-----------------------------------------------------------------.
  52 | Return a newly allocated string composed of the concatenation of |
  53 | the END1 first chars of STRING1, and STRING2.                    |
  54 `-----------------------------------------------------------------*/
  55
  56 static char *
  57 stringappend (const char *string1, int end1, const char *string2)
  58 {
  59   char *res;
  60   char *cp;
  61   const char *cp1;
  62   int i;
  63
  64   cp1 = string2;
  65   i = 0;
  66   while (*cp1++)
  67     i++;
  68
  69   res = XCALLOC (char, i + end1 + 1);
  70
  71   cp = res;
  72   cp1 = string1;
  73   for (i = 0; i < end1; i++)
  74     *cp++ = *cp1++;
  75
  76   cp1 = string2;
  77   while ((*cp++ = *cp1++))
  78     ;
  79
  80   return res;
  81 }
  82
  83 /*-----------------------------------------------------------------.
  84 | Try to open file NAME with mode MODE, and print an error message |
  85 | if fails.                                                        |
  86 `-----------------------------------------------------------------*/
  87
  88 static FILE *
  89 xfopen (const char *name, const char *mode)
  90 {
  91   FILE *ptr;
  92
  93   ptr = fopen (name, mode);
  94   if (!ptr)
  95     error (2, errno, _("cannot open file `%s'"), name);
  96
  97   return ptr;
  98 }
  99
 100 /*-------------------------------------------------------------.
 101 | Try to close file PTR, and print an error message if fails.  |
 102 `-------------------------------------------------------------*/
 103
 104 static int
 105 xfclose (FILE *ptr)
 106 {
 107   int result;
 108
 109   if (ptr == NULL)
 110     return 0;
 111
 112   result = fclose (ptr);
 113   if (result == EOF)
 114     error (2, errno, _("cannot close file"));
 115
 116   return result;
 117 }
 118
 119 /*--------------------------------------------------.
 120 | Save the content of the obstack OBS in FILENAME.  |
 121 `--------------------------------------------------*/
 122
 123 static void
 124 obstack_save (struct obstack *obs, const char *filename)
 125 {
 126   FILE *out = xfopen (filename, "w");
 127   size_t size = obstack_object_size (obs);
 128   fwrite (obstack_finish (obs), 1, size, out);
 129   xfclose (out);
 130 }
 131
 132
 133 static const char *
 134 skeleton_find (const char *envvar, const char *skeleton)
 135 {
 136   const char *res = getenv (envvar);
 137
 138 #ifdef MSDOS
 139   const char *cp;
 140
 141   /* File doesn't exist in current directory; try in INIT directory.  */
 142   if (!res && (cp = getenv ("INIT")))
 143     {
 144       res = XMALLOC (char, strlen (cp) + strlen (skeleton) + 2);
 145       sprintf (res, "%s%c%s", cp, '/', skeleton);
 146     }
 147 #endif /* !MSDOS */
 148
 149   if (!res)
 150     res = skeleton;
 151
 152   return res;
 153 }
 154
 155 \f
 156 /*-----------------------------------------------------------------.
 157 | Open the input file.  Look for the skeletons.  Find the names of |
 158 | the output files.  Prepare the obstacks.                         |
 159 `-----------------------------------------------------------------*/
 160
 161 void
 162 open_files (void)
 163 {
 164   char *name_base;
 165   int base_length;
 166   int short_base_length;
 167
 168   if (spec_outfile)
 169     {
 170       /* -o was specified.  The precise -o name will be used for FTABLE.
 171          For other output files, remove the ".c" or ".tab.c" suffix.  */
 172       name_base = spec_outfile;
 173 #ifdef MSDOS
 174       strlwr (name_base);
 175 #endif /* MSDOS */
 176       /* BASE_LENGTH includes ".tab" but not ".c".  */
 177       base_length = strlen (name_base);
 178       if (!strcmp (name_base + base_length - 2, ".c"))
 179         base_length -= 2;
 180       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 181       short_base_length = base_length;
 182       if (!strncmp (name_base + short_base_length - 4, ".tab", 4))
 183         short_base_length -= 4;
 184       else if (!strncmp (name_base + short_base_length - 4, "_tab", 4))
 185         short_base_length -= 4;
 186     }
 187   else if (spec_file_prefix)
 188     {
 189       /* -b was specified.  Construct names from it.  */
 190       /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
 191       short_base_length = strlen (spec_file_prefix);
 192       /* Count room for `.tab'.  */
 193       base_length = short_base_length + 4;
 194       name_base = XMALLOC (char, base_length + 1);
 195       /* Append `.tab'.  */
 196       strcpy (name_base, spec_file_prefix);
 197       strcat (name_base, EXT_TAB);
 198 #ifdef MSDOS
 199       strlwr (name_base);
 200 #endif /* MSDOS */
 201     }
 202   else
 203     {
 204       /* -o was not specified; compute output file name from input
 205          or use y.tab.c, etc., if -y was specified.  */
 206
 207       static char FIXED_NAME_BASE[] = "y.y";
 208
 209       name_base = yacc_flag ? FIXED_NAME_BASE : infile;
 210
 211       /* BASE_LENGTH gets length of NAME_BASE, sans ".y" suffix if any.  */
 212
 213       base_length = strlen (name_base);
 214       if (!strcmp (name_base + base_length - 2, ".y"))
 215         base_length -= 2;
 216       short_base_length = base_length;
 217
 218       name_base = stringappend (name_base, short_base_length, EXT_TAB);
 219       base_length = short_base_length + 4;
 220     }
 221
 222   finput = xfopen (infile, "r");
 223
 224   if (!no_parser_flag)
 225     fparser = xfopen (skeleton_find ("BISON_SIMPLE", BISON_SIMPLE), "r");
 226
 227   if (verbose_flag)
 228     {
 229       /* We used to use just .out if spec_name_prefix (-p) was used,
 230          but that conflicts with Posix.  */
 231       outfile = stringappend (name_base, short_base_length, EXT_OUTPUT);
 232       foutput = xfopen (outfile, "w");
 233     }
 234
 235   if (no_parser_flag)
 236     {
 237       /* use permanent name for actions file */
 238       actfile = stringappend (name_base, short_base_length, ".act");
 239     }
 240
 241   if (defines_flag)
 242     {
 243       defsfile = stringappend (name_base, base_length, ".h");
 244     }
 245
 246   /* These are opened by `done' or `open_extra_files', if at all */
 247   if (spec_outfile)
 248     tabfile = spec_outfile;
 249   else
 250     tabfile = stringappend (name_base, base_length, ".c");
 251
 252   attrsfile = stringappend (name_base, short_base_length, EXT_STYPE_H);
 253   guardfile = stringappend (name_base, short_base_length, EXT_GUARD_C);
 254
 255   /* Initialize the obstacks. */
 256   obstack_init (&action_obstack);
 257   obstack_init (&attrs_obstack);
 258   obstack_init (&table_obstack);
 259   obstack_init (&defines_obstack);
 260 }
 261
 262
 263
 264 /*--------------------------------------------------------------------.
 265 | Open the output files needed only for the semantic parser.  This    |
 266 | is done when %semantic_parser is seen in the declarations section.  |
 267 `--------------------------------------------------------------------*/
 268
 269 void
 270 open_extra_files (void)
 271 {
 272   xfclose (fparser);
 273
 274   if (!no_parser_flag)
 275     fparser = xfopen (skeleton_find ("BISON_HAIRY", BISON_HAIRY), "r");
 276   fguard = xfopen (guardfile, "w");
 277 }
 278
 279
 280 /*-----------------------------------------------------.
 281 | Close the open files, produce all the output files.  |
 282 `-----------------------------------------------------*/
 283
 284 void
 285 output_files (void)
 286 {
 287   xfclose (fguard);
 288   xfclose (finput);
 289   xfclose (fparser);
 290   xfclose (foutput);
 291
 292   /* Output the main file.  */
 293   obstack_save (&table_obstack, tabfile);
 294
 295   /* Output the header file if wanted. */
 296   if (defines_flag)
 297     obstack_save (&defines_obstack, defsfile);
 298
 299   /* If we output only the table, dump the actions in ACTFILE.
 300      */
 301   if (no_parser_flag)
 302     obstack_save (&action_obstack, actfile);
 303
 304   /* If we produced a semantic parser ATTRS_OBSTACK must be dumped
 305      into its own file, ATTTRSFILE.  */
 306   if (semantic_parser)
 307     obstack_save (&attrs_obstack, attrsfile);
 308 }