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