src/files.c

   1 /* Open and close files for Bison.
   2
   3    Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
   4    2005, 2006 Free Software Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    Bison is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    Bison is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Bison; see the file COPYING.  If not, write to the Free
  20    Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #include <config.h>
  24 #include "system.h"
  25
  26 #include <error.h>
  27 #include <dirname.h>
  28 #include <get-errno.h>
  29 #include <quote.h>
  30 #include <stdio-safer.h>
  31 #include <xstrndup.h>
  32
  33 #include "complain.h"
  34 #include "files.h"
  35 #include "getargs.h"
  36 #include "gram.h"
  37
  38 struct obstack pre_prologue_obstack;
  39 struct obstack post_prologue_obstack;
  40
  41 /* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
  42    tempting, but don't do that: for the time being our handling of the
  43    %directive vs --option leaves precedence to the options by deciding
  44    that if a %directive sets a variable which is really set (i.e., not
  45    NULL), then the %directive is ignored.  As a result, %name-prefix,
  46    for instance, will not be honored.  */
  47
  48 char const *spec_outfile = NULL;       /* for -o. */
  49 char const *spec_file_prefix = NULL;   /* for -b. */
  50 char const *spec_name_prefix = NULL;   /* for -p. */
  51 char *spec_verbose_file = NULL;  /* for --verbose. */
  52 char *spec_graph_file = NULL;    /* for -g. */
  53 char *spec_defines_file = NULL;  /* for --defines. */
  54 char *parser_file_name;
  55
  56 /* All computed output file names.  */
  57 static char **file_names = NULL;
  58 static int file_names_count = 0;
  59
  60 uniqstr grammar_file = NULL;
  61 uniqstr current_file = NULL;
  62
  63 /* If --output=dir/foo.c was specified,
  64    DIR_PREFIX is `dir/' and ALL_BUT_EXT and ALL_BUT_TAB_EXT are `dir/foo'.
  65
  66    If --output=dir/foo.tab.c was specified, DIR_PREFIX is `dir/',
  67    ALL_BUT_EXT is `dir/foo.tab', and ALL_BUT_TAB_EXT is `dir/foo'.
  68
  69    If --output was not specified but --file-prefix=dir/foo was specified,
  70    ALL_BUT_EXT = `foo.tab' and ALL_BUT_TAB_EXT = `foo'.
  71
  72    If neither --output nor --file was specified but the input grammar
  73    is name dir/foo.y, ALL_BUT_EXT and ALL_BUT_TAB_EXT are `foo'.
  74
  75    If neither --output nor --file was specified, DIR_PREFIX is the
  76    empty string (meaning the current directory); otherwise it is
  77    `dir/'.  */
  78
  79 char *all_but_ext;
  80 static char *all_but_tab_ext;
  81 char *dir_prefix;
  82
  83 /* C source file extension (the parser source).  */
  84 static char *src_extension = NULL;
  85 /* Header file extension (if option ``-d'' is specified).  */
  86 static char *header_extension = NULL;
  87 \f
  88 /*-----------------------------------------------------------------.
  89 | Return a newly allocated string composed of the concatenation of |
  90 | STR1, and STR2.                                                  |
  91 `-----------------------------------------------------------------*/
  92
  93 static char *
  94 concat2 (char const *str1, char const *str2)
  95 {
  96   size_t len = strlen (str1) + strlen (str2);
  97   char *res = xmalloc (len + 1);
  98   char *cp;
  99   cp = stpcpy (res, str1);
 100   cp = stpcpy (cp, str2);
 101   return res;
 102 }
 103
 104 /*-----------------------------------------------------------------.
 105 | Try to open file NAME with mode MODE, and print an error message |
 106 | if fails.                                                        |
 107 `-----------------------------------------------------------------*/
 108
 109 FILE *
 110 xfopen (const char *name, const char *mode)
 111 {
 112   FILE *ptr;
 113
 114   ptr = fopen_safer (name, mode);
 115   if (!ptr)
 116     error (EXIT_FAILURE, get_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 void
 126 xfclose (FILE *ptr)
 127 {
 128   if (ptr == NULL)
 129     return;
 130
 131   if (ferror (ptr))
 132     error (EXIT_FAILURE, 0, _("I/O error"));
 133
 134   if (fclose (ptr) != 0)
 135     error (EXIT_FAILURE, get_errno (), _("cannot close file"));
 136 }
 137 \f
 138
 139 /*------------------------------------------------------------------.
 140 | Compute ALL_BUT_EXT, ALL_BUT_TAB_EXT and output files extensions. |
 141 `------------------------------------------------------------------*/
 142
 143 /* In the string S, replace all characters FROM by TO.  */
 144 static void
 145 tr (char *s, char from, char to)
 146 {
 147   for (; *s; s++)
 148     if (*s == from)
 149       *s = to;
 150 }
 151
 152 /* Compute extensions from the grammar file extension.  */
 153 static void
 154 compute_exts_from_gf (const char *ext)
 155 {
 156   src_extension = xstrdup (ext);
 157   header_extension = xstrdup (ext);
 158   tr (src_extension, 'y', 'c');
 159   tr (src_extension, 'Y', 'C');
 160   tr (header_extension, 'y', 'h');
 161   tr (header_extension, 'Y', 'H');
 162 }
 163
 164 /* Compute extensions from the given c source file extension.  */
 165 static void
 166 compute_exts_from_src (const char *ext)
 167 {
 168   /* We use this function when the user specifies `-o' or `--output',
 169      so the extenions must be computed unconditionally from the file name
 170      given by this option.  */
 171   src_extension = xstrdup (ext);
 172   header_extension = xstrdup (ext);
 173   tr (header_extension, 'c', 'h');
 174   tr (header_extension, 'C', 'H');
 175 }
 176
 177
 178 /* Decompose FILE_NAME in four parts: *BASE, *TAB, and *EXT, the fourth
 179    part, (the directory) is ranging from FILE_NAME to the char before
 180    *BASE, so we don't need an additional parameter.
 181
 182    *EXT points to the last period in the basename, or NULL if none.
 183
 184    If there is no *EXT, *TAB is NULL.  Otherwise, *TAB points to
 185    `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
 186    cannot be equal to *BASE.
 187
 188    None are allocated, they are simply pointers to parts of FILE_NAME.
 189    Examples:
 190
 191    '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
 192    '.c'
 193
 194    'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
 195
 196    'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
 197
 198    '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
 199
 200    'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
 201
 202    'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
 203
 204    'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL.  */
 205
 206 static void
 207 file_name_split (const char *file_name,
 208                  const char **base, const char **tab, const char **ext)
 209 {
 210   *base = last_component (file_name);
 211
 212   /* Look for the extension, i.e., look for the last dot. */
 213   *ext = strrchr (*base, '.');
 214   *tab = NULL;
 215
 216   /* If there is an extension, check if there is a `.tab' part right
 217      before.  */
 218   if (*ext)
 219     {
 220       size_t baselen = *ext - *base;
 221       size_t dottablen = 4;
 222       if (dottablen < baselen
 223           && (strncmp (*ext - dottablen, ".tab", dottablen) == 0
 224               || strncmp (*ext - dottablen, "_tab", dottablen) == 0))
 225         *tab = *ext - dottablen;
 226     }
 227 }
 228
 229
 230 static void
 231 compute_file_name_parts (void)
 232 {
 233   const char *base, *tab, *ext;
 234
 235   /* Compute ALL_BUT_EXT and ALL_BUT_TAB_EXT from SPEC_OUTFILE
 236      or GRAMMAR_FILE.
 237
 238      The precise -o name will be used for FTABLE.  For other output
 239      files, remove the ".c" or ".tab.c" suffix.  */
 240   if (spec_outfile)
 241     {
 242       file_name_split (spec_outfile, &base, &tab, &ext);
 243       dir_prefix = xstrndup (spec_outfile, base - spec_outfile);
 244
 245       /* ALL_BUT_EXT goes up the EXT, excluding it. */
 246       all_but_ext =
 247         xstrndup (spec_outfile,
 248                   (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
 249
 250       /* ALL_BUT_TAB_EXT goes up to TAB, excluding it.  */
 251       all_but_tab_ext =
 252         xstrndup (spec_outfile,
 253                   (strlen (spec_outfile)
 254                    - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
 255
 256       if (ext)
 257         compute_exts_from_src (ext);
 258     }
 259   else
 260     {
 261       file_name_split (grammar_file, &base, &tab, &ext);
 262
 263       if (spec_file_prefix)
 264         {
 265           /* If --file-prefix=foo was specified, ALL_BUT_TAB_EXT = `foo'.  */
 266           dir_prefix = xstrndup (grammar_file, base - grammar_file);
 267           all_but_tab_ext = xstrdup (spec_file_prefix);
 268         }
 269       else if (yacc_flag)
 270         {
 271           /* If --yacc, then the output is `y.tab.c'.  */
 272           dir_prefix = xstrdup ("");
 273           all_but_tab_ext = xstrdup ("y");
 274         }
 275       else
 276         {
 277           /* Otherwise, ALL_BUT_TAB_EXT is computed from the input
 278              grammar: `foo/bar.yy' => `bar'.  */
 279           dir_prefix = xstrdup ("");
 280           all_but_tab_ext =
 281             xstrndup (base, (strlen (base) - (ext ? strlen (ext) : 0)));
 282         }
 283
 284       all_but_ext = concat2 (all_but_tab_ext, 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 (report_flag)
 326     {
 327       spec_verbose_file = concat2 (all_but_tab_ext, OUTPUT_EXT);
 328       output_file_name_check (spec_verbose_file);
 329     }
 330
 331   free (all_but_tab_ext);
 332   free (src_extension);
 333   free (header_extension);
 334 }
 335
 336 void
 337 output_file_name_check (char const *file_name)
 338 {
 339   {
 340     int i;
 341     for (i = 0; i < file_names_count; i++)
 342       if (0 == strcmp (file_names[i], file_name))
 343         warn (_("conflicting outputs to file %s"), quote (file_name));
 344   }
 345   file_names = xnrealloc (file_names, ++file_names_count, sizeof *file_names);
 346   file_names[file_names_count-1] = xstrdup (file_name);
 347 }
 348
 349 void
 350 output_file_names_free (void)
 351 {
 352   free (all_but_ext);
 353   free (spec_verbose_file);
 354   free (spec_graph_file);
 355   free (spec_defines_file);
 356   free (parser_file_name);
 357   free (dir_prefix);
 358   {
 359     int i;
 360     for (i = 0; i < file_names_count; i++)
 361       free (file_names[i]);
 362   }
 363   free (file_names);
 364 }