src/files.c

   1 /* Open and close files for Bison.
   2
   3    Copyright (C) 1984, 1986, 1989, 1992, 2000-2012 Free Software
   4    Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include <config.h>
  22 #include "system.h"
  23
  24 #include <error.h>
  25 #include <dirname.h>
  26 #include <get-errno.h>
  27 #include <quote.h>
  28 #include <stdio-safer.h>
  29 #include <xstrndup.h>
  30
  31 #include "complain.h"
  32 #include "files.h"
  33 #include "getargs.h"
  34 #include "gram.h"
  35
  36 /* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
  37    tempting, but don't do that: for the time being our handling of the
  38    %directive vs --option leaves precedence to the options by deciding
  39    that if a %directive sets a variable which is really set (i.e., not
  40    NULL), then the %directive is ignored.  As a result, %name-prefix,
  41    for instance, will not be honored.  */
  42
  43 char const *spec_outfile = NULL;       /* for -o. */
  44 char const *spec_file_prefix = NULL;   /* for -b. */
  45 char const *spec_name_prefix = NULL;   /* for -p. */
  46 char *spec_verbose_file = NULL;  /* for --verbose. */
  47 char *spec_graph_file = NULL;    /* for -g. */
  48 char *spec_xml_file = NULL;      /* for -x. */
  49 char *spec_defines_file = NULL;  /* for --defines. */
  50 char *parser_file_name;
  51
  52 /* All computed output file names.  */
  53 static char **file_names = NULL;
  54 static int file_names_count = 0;
  55
  56 uniqstr grammar_file = NULL;
  57 uniqstr current_file = NULL;
  58
  59 /* If --output=dir/foo.c was specified,
  60    DIR_PREFIX is `dir/' and ALL_BUT_EXT and ALL_BUT_TAB_EXT are `dir/foo'.
  61
  62    If --output=dir/foo.tab.c was specified, DIR_PREFIX is `dir/',
  63    ALL_BUT_EXT is `dir/foo.tab', and ALL_BUT_TAB_EXT is `dir/foo'.
  64
  65    If --output was not specified but --file-prefix=dir/foo was specified,
  66    ALL_BUT_EXT = `foo.tab' and ALL_BUT_TAB_EXT = `foo'.
  67
  68    If neither --output nor --file was specified but the input grammar
  69    is name dir/foo.y, ALL_BUT_EXT and ALL_BUT_TAB_EXT are `foo'.
  70
  71    If neither --output nor --file was specified, DIR_PREFIX is the
  72    empty string (meaning the current directory); otherwise it is
  73    `dir/'.  */
  74
  75 char *all_but_ext;
  76 static char *all_but_tab_ext;
  77 char *dir_prefix;
  78
  79 /* C source file extension (the parser source).  */
  80 static char *src_extension = NULL;
  81 /* Header file extension (if option ``-d'' is specified).  */
  82 static char *header_extension = NULL;
  83 \f
  84 /*-----------------------------------------------------------------.
  85 | Return a newly allocated string composed of the concatenation of |
  86 | STR1, and STR2.                                                  |
  87 `-----------------------------------------------------------------*/
  88
  89 static char *
  90 concat2 (char const *str1, char const *str2)
  91 {
  92   size_t len = strlen (str1) + strlen (str2);
  93   char *res = xmalloc (len + 1);
  94   char *cp;
  95   cp = stpcpy (res, str1);
  96   cp = stpcpy (cp, str2);
  97   return res;
  98 }
  99
 100 /*-----------------------------------------------------------------.
 101 | Try to open file NAME with mode MODE, and print an error message |
 102 | if fails.                                                        |
 103 `-----------------------------------------------------------------*/
 104
 105 FILE *
 106 xfopen (const char *name, const char *mode)
 107 {
 108   FILE *ptr;
 109
 110   ptr = fopen_safer (name, mode);
 111   if (!ptr)
 112     error (EXIT_FAILURE, get_errno (), _("cannot open file '%s'"), name);
 113
 114   return ptr;
 115 }
 116
 117 /*-------------------------------------------------------------.
 118 | Try to close file PTR, and print an error message if fails.  |
 119 `-------------------------------------------------------------*/
 120
 121 void
 122 xfclose (FILE *ptr)
 123 {
 124   if (ptr == NULL)
 125     return;
 126
 127   if (ferror (ptr))
 128     error (EXIT_FAILURE, 0, _("I/O error"));
 129
 130   if (fclose (ptr) != 0)
 131     error (EXIT_FAILURE, get_errno (), _("cannot close file"));
 132 }
 133 \f
 134
 135 /*------------------------------------------------------------------.
 136 | Compute ALL_BUT_EXT, ALL_BUT_TAB_EXT and output files extensions. |
 137 `------------------------------------------------------------------*/
 138
 139 /* Compute extensions from the grammar file extension.  */
 140 static void
 141 compute_exts_from_gf (const char *ext)
 142 {
 143   if (strcmp (ext, ".y") == 0)
 144     {
 145       src_extension = xstrdup (language->src_extension);
 146       header_extension = xstrdup (language->header_extension);
 147     }
 148   else
 149     {
 150       src_extension = xstrdup (ext);
 151       header_extension = xstrdup (ext);
 152       tr (src_extension, 'y', 'c');
 153       tr (src_extension, 'Y', 'C');
 154       tr (header_extension, 'y', 'h');
 155       tr (header_extension, 'Y', 'H');
 156     }
 157 }
 158
 159 /* Compute extensions from the given c source file extension.  */
 160 static void
 161 compute_exts_from_src (const char *ext)
 162 {
 163   /* We use this function when the user specifies `-o' or `--output',
 164      so the extenions must be computed unconditionally from the file name
 165      given by this option.  */
 166   src_extension = xstrdup (ext);
 167   header_extension = xstrdup (ext);
 168   tr (header_extension, 'c', 'h');
 169   tr (header_extension, 'C', 'H');
 170 }
 171
 172
 173 /* Decompose FILE_NAME in four parts: *BASE, *TAB, and *EXT, the fourth
 174    part, (the directory) is ranging from FILE_NAME to the char before
 175    *BASE, so we don't need an additional parameter.
 176
 177    *EXT points to the last period in the basename, or NULL if none.
 178
 179    If there is no *EXT, *TAB is NULL.  Otherwise, *TAB points to
 180    `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
 181    cannot be equal to *BASE.
 182
 183    None are allocated, they are simply pointers to parts of FILE_NAME.
 184    Examples:
 185
 186    '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
 187    '.c'
 188
 189    'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
 190
 191    'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
 192
 193    '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
 194
 195    'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
 196
 197    'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
 198
 199    'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL.  */
 200
 201 static void
 202 file_name_split (const char *file_name,
 203                  const char **base, const char **tab, const char **ext)
 204 {
 205   *base = last_component (file_name);
 206
 207   /* Look for the extension, i.e., look for the last dot. */
 208   *ext = mbsrchr (*base, '.');
 209   *tab = NULL;
 210
 211   /* If there is an extension, check if there is a `.tab' part right
 212      before.  */
 213   if (*ext)
 214     {
 215       size_t baselen = *ext - *base;
 216       size_t dottablen = 4;
 217       if (dottablen < baselen
 218           && (strncmp (*ext - dottablen, ".tab", dottablen) == 0
 219               || strncmp (*ext - dottablen, "_tab", dottablen) == 0))
 220         *tab = *ext - dottablen;
 221     }
 222 }
 223
 224
 225 static void
 226 compute_file_name_parts (void)
 227 {
 228   const char *base, *tab, *ext;
 229
 230   /* Compute ALL_BUT_EXT and ALL_BUT_TAB_EXT from SPEC_OUTFILE
 231      or GRAMMAR_FILE.
 232
 233      The precise -o name will be used for FTABLE.  For other output
 234      files, remove the ".c" or ".tab.c" suffix.  */
 235   if (spec_outfile)
 236     {
 237       file_name_split (spec_outfile, &base, &tab, &ext);
 238       dir_prefix = xstrndup (spec_outfile, base - spec_outfile);
 239
 240       /* ALL_BUT_EXT goes up the EXT, excluding it. */
 241       all_but_ext =
 242         xstrndup (spec_outfile,
 243                   (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
 244
 245       /* ALL_BUT_TAB_EXT goes up to TAB, excluding it.  */
 246       all_but_tab_ext =
 247         xstrndup (spec_outfile,
 248                   (strlen (spec_outfile)
 249                    - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
 250
 251       if (ext)
 252         compute_exts_from_src (ext);
 253     }
 254   else
 255     {
 256       file_name_split (grammar_file, &base, &tab, &ext);
 257
 258       if (spec_file_prefix)
 259         {
 260           /* If --file-prefix=foo was specified, ALL_BUT_TAB_EXT = `foo'.  */
 261           dir_prefix =
 262             xstrndup (spec_file_prefix,
 263                       last_component (spec_file_prefix) - spec_file_prefix);
 264           all_but_tab_ext = xstrdup (spec_file_prefix);
 265         }
 266       else if (yacc_flag)
 267         {
 268           /* If --yacc, then the output is `y.tab.c'.  */
 269           dir_prefix = xstrdup ("");
 270           all_but_tab_ext = xstrdup ("y");
 271         }
 272       else
 273         {
 274           /* Otherwise, ALL_BUT_TAB_EXT is computed from the input
 275              grammar: `foo/bar.yy' => `bar'.  */
 276           dir_prefix = xstrdup ("");
 277           all_but_tab_ext =
 278             xstrndup (base, (strlen (base) - (ext ? strlen (ext) : 0)));
 279         }
 280
 281       if (language->add_tab)
 282         all_but_ext = concat2 (all_but_tab_ext, TAB_EXT);
 283       else
 284         all_but_ext = xstrdup (all_but_tab_ext);
 285
 286       /* Compute the extensions from the grammar file name.  */
 287       if (ext && !yacc_flag)
 288         compute_exts_from_gf (ext);
 289     }
 290 }
 291
 292
 293 /* Compute the output file names.  Warn if we detect conflicting
 294    outputs to the same file.  */
 295
 296 void
 297 compute_output_file_names (void)
 298 {
 299   compute_file_name_parts ();
 300
 301   /* If not yet done. */
 302   if (!src_extension)
 303     src_extension = xstrdup (".c");
 304   if (!header_extension)
 305     header_extension = xstrdup (".h");
 306
 307   parser_file_name =
 308     (spec_outfile
 309      ? xstrdup (spec_outfile)
 310      : concat2 (all_but_ext, src_extension));
 311
 312   if (defines_flag)
 313     {
 314       if (! spec_defines_file)
 315         spec_defines_file = concat2 (all_but_ext, header_extension);
 316     }
 317
 318   if (graph_flag)
 319     {
 320       if (! spec_graph_file)
 321         spec_graph_file = concat2 (all_but_tab_ext, ".dot");
 322       output_file_name_check (&spec_graph_file);
 323     }
 324
 325   if (xml_flag)
 326     {
 327       if (! spec_xml_file)
 328         spec_xml_file = concat2 (all_but_tab_ext, ".xml");
 329       output_file_name_check (&spec_xml_file);
 330     }
 331
 332   if (report_flag)
 333     {
 334       if (!spec_verbose_file)
 335         spec_verbose_file = concat2 (all_but_tab_ext, OUTPUT_EXT);
 336       output_file_name_check (&spec_verbose_file);
 337     }
 338
 339   free (all_but_tab_ext);
 340   free (src_extension);
 341   free (header_extension);
 342 }
 343
 344 void
 345 output_file_name_check (char **file_name)
 346 {
 347   bool conflict = false;
 348   if (0 == strcmp (*file_name, grammar_file))
 349     {
 350       complain (_("refusing to overwrite the input file %s"),
 351                 quote (*file_name));
 352       conflict = true;
 353     }
 354   else
 355     {
 356       int i;
 357       for (i = 0; i < file_names_count; i++)
 358         if (0 == strcmp (file_names[i], *file_name))
 359           {
 360             warn (_("conflicting outputs to file %s"),
 361                   quote (*file_name));
 362             conflict = true;
 363           }
 364     }
 365   if (conflict)
 366     {
 367       free (*file_name);
 368       *file_name = strdup ("/dev/null");
 369     }
 370   else
 371     {
 372       file_names = xnrealloc (file_names, ++file_names_count,
 373                               sizeof *file_names);
 374       file_names[file_names_count-1] = xstrdup (*file_name);
 375     }
 376 }
 377
 378 void
 379 output_file_names_free (void)
 380 {
 381   free (all_but_ext);
 382   free (spec_verbose_file);
 383   free (spec_graph_file);
 384   free (spec_xml_file);
 385   free (spec_defines_file);
 386   free (parser_file_name);
 387   free (dir_prefix);
 388   {
 389     int i;
 390     for (i = 0; i < file_names_count; i++)
 391       free (file_names[i]);
 392   }
 393   free (file_names);
 394 }