src/files.c

   1 /* Open and close files for bison,
   2    Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    Bison is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    Bison is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bison; see the file COPYING.  If not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22
  23 #include "system.h"
  24 #include "getargs.h"
  25 #include "files.h"
  26 #include "gram.h"
  27 #include "error.h"
  28 #include "complain.h"
  29
  30 /* From basename.c.  Almost a lie, as it returns a char *. */
  31 const char *base_name (char const *name);
  32
  33 FILE *finput = NULL;
  34
  35 struct obstack pre_prologue_obstack;
  36 struct obstack post_prologue_obstack;
  37
  38 /* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
  39    tempting, but don't do that: for the time being our handling of the
  40    %directive vs --option leaves precedence to the options by deciding
  41    that if a %directive sets a variable which is really set (i.e., not
  42    NULL), then the %directive is ignored.  As a result, %name-prefix,
  43    for instance, will not be honored.  */
  44
  45 char *spec_outfile = NULL;      /* for -o. */
  46 char *spec_file_prefix = NULL;  /* for -b. */
  47 const char *spec_name_prefix = NULL;    /* for -p. */
  48 char *spec_verbose_file = NULL;   /* for --verbose. */
  49 char *spec_graph_file = NULL;   /* for -g. */
  50 char *spec_defines_file = NULL; /* for --defines. */
  51 char *parser_file_name = NULL;
  52
  53 char *infile = NULL;
  54
  55 static char *full_base_name = NULL;
  56
  57 /* Prefix used to generate output file names.  */
  58 char *short_base_name = NULL;
  59
  60 /* Infix used to generate output file names (i.e., `.tab', or `_tab',
  61    or `').  */
  62 char *output_infix = NULL;
  63
  64 /* C source file extension (the parser source).  */
  65 const char *src_extension = NULL;
  66 /* Header file extension (if option ``-d'' is specified).  */
  67 const char *header_extension = NULL;
  68 \f
  69
  70 /*--------------------------.
  71 | Is SUFFIX ending STRING?  |
  72 `--------------------------*/
  73
  74 int
  75 strsuffix (const char *string, const char *suffix)
  76 {
  77   size_t string_len = strlen (string);
  78   size_t suffix_len = strlen (suffix);
  79   if (suffix_len <= string_len)
  80     return !strcmp (string + string_len - suffix_len, suffix);
  81   else
  82     return 0;
  83 }
  84
  85
  86 /*-----------------------------------------------------------------.
  87 | Return a newly allocated string composed of the concatenation of |
  88 | STRING1, and STRING2.                                            |
  89 `-----------------------------------------------------------------*/
  90
  91 char*
  92 stringappend (const char *string1, const char *string2)
  93 {
  94   size_t len = strlen (string1) + strlen (string2);
  95   char *res = XMALLOC (char, len + 1);
  96   char *cp;
  97   cp = stpcpy (res, string1);
  98   cp = stpcpy (cp, string2);
  99   return res;
 100 }
 101
 102 /*-----------------------------------------------------------------.
 103 | Try to open file NAME with mode MODE, and print an error message |
 104 | if fails.                                                        |
 105 `-----------------------------------------------------------------*/
 106
 107 FILE *
 108 xfopen (const char *name, const char *mode)
 109 {
 110   FILE *ptr;
 111
 112   ptr = fopen (name, mode);
 113   if (!ptr)
 114     error (EXIT_FAILURE, errno, _("cannot open file `%s'"), name);
 115
 116   return ptr;
 117 }
 118
 119 /*-------------------------------------------------------------.
 120 | Try to close file PTR, and print an error message if fails.  |
 121 `-------------------------------------------------------------*/
 122
 123 void
 124 xfclose (FILE *ptr)
 125 {
 126   if (ptr == NULL)
 127     return;
 128
 129   if (ferror (ptr))
 130     error (EXIT_FAILURE, 0, _("I/O error"));
 131
 132   if (fclose (ptr) != 0)
 133     error (EXIT_FAILURE, errno, _("cannot close file"));
 134 }
 135 \f
 136
 137 /*----------------------------------------------------------------.
 138 | Compute BASE_NAME, SHORT_BASE_NAME and output files extensions. |
 139 `----------------------------------------------------------------*/
 140
 141 /* Replace all characters FROM by TO in the string IN.
 142    and returns a new allocated string.  */
 143 static char *
 144 tr (const char *in, char from, char to)
 145 {
 146   char *temp;
 147   char *out;
 148
 149   out = XMALLOC (char, strlen (in) + 1);
 150
 151   for (temp = out; *in; in++, out++)
 152     if (*in == from)
 153       *out = to;
 154     else
 155       *out = *in;
 156   *out = 0;
 157   return (temp);
 158 }
 159
 160 /* Computes extensions from the grammar file extension. */
 161 static void
 162 compute_exts_from_gf (const char *ext)
 163 {
 164   src_extension = tr (ext, 'y', 'c');
 165   src_extension = tr (src_extension, 'Y', 'C');
 166   header_extension = tr (ext, 'y', 'h');
 167   header_extension = tr (header_extension, 'Y', 'H');
 168 }
 169
 170 /* Computes extensions from the given c source file extension. */
 171 static void
 172 compute_exts_from_src (const char *ext)
 173 {
 174   /* We use this function when the user specifies `-o' or `--output',
 175      so the extenions must be computed unconditionally from the file name
 176      given by this option.  */
 177   src_extension = xstrdup (ext);
 178   header_extension = tr (ext, 'c', 'h');
 179   header_extension = tr (header_extension, 'C', 'H');
 180 }
 181
 182
 183 /* Decompose FILENAME in four parts: *BASE, *TAB, and *EXT, the fourth
 184    part, (the directory) is ranging from FILENAME to the char before
 185    *BASE, so we don't need an additional parameter.
 186
 187    *EXT points to the last period in the basename, or NULL if none.
 188
 189    If there is no *EXT, *TAB is NULL.  Otherwise, *TAB points to
 190    `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
 191    cannot be equal to *BASE.
 192
 193    None are allocated, they are simply pointers to parts of FILENAME.
 194    Examples:
 195
 196    '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
 197    '.c'
 198
 199    'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
 200
 201    'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
 202
 203    '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
 204
 205    'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
 206
 207    'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
 208
 209    'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL.  */
 210
 211 static void
 212 filename_split (const char *filename,
 213                 const char **base, const char **tab, const char **ext)
 214 {
 215   *base = base_name (filename);
 216
 217   /* Look for the extension, i.e., look for the last dot. */
 218   *ext = strrchr (*base, '.');
 219   *tab = NULL;
 220
 221   /* If there is an exentension, check if there is a `.tab' part right
 222      before.  */
 223   if (*ext
 224       && (*ext - *base) > (int) strlen (".tab")
 225       && (!strncmp (*ext - strlen (".tab"), ".tab", strlen (".tab"))
 226           || !strncmp (*ext - strlen ("_tab"), "_tab", strlen ("_tab"))))
 227     *tab = *ext - strlen (".tab");
 228 }
 229
 230
 231 /* FIXME: Should use xstrndup. */
 232
 233 static void
 234 compute_base_names (void)
 235 {
 236   const char *base, *tab, *ext;
 237
 238   /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
 239      BASE_NAME and SHORT_BASE_NAME are `foo'.
 240
 241      If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
 242      SHORT_BASE_NAME is `foo'.
 243
 244      The precise -o name will be used for FTABLE.  For other output
 245      files, remove the ".c" or ".tab.c" suffix.  */
 246   if (spec_outfile)
 247     {
 248       filename_split (spec_outfile, &base, &tab, &ext);
 249
 250       /* The full base name goes up the EXT, excluding it. */
 251       full_base_name =
 252         xstrndup (spec_outfile,
 253                   (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
 254
 255       /* The short base name goes up to TAB, excluding it.  */
 256       short_base_name =
 257         xstrndup (spec_outfile,
 258                   (strlen (spec_outfile)
 259                    - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
 260
 261       if (tab)
 262         output_infix = xstrndup (tab,
 263                                  (strlen (tab) - (ext ? strlen (ext) : 0)));
 264
 265       if (ext)
 266         compute_exts_from_src (ext);
 267     }
 268
 269   /* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
 270      and SHORT_BASE_NAME = `foo'.
 271
 272      Construct names from it.  */
 273   else
 274     {
 275       if (spec_file_prefix)
 276         {
 277           /* If --file-prefix=foo was specified, SHORT_BASE_NAME =
 278              `foo'.  */
 279           short_base_name = xstrdup (spec_file_prefix);
 280         }
 281       else if (yacc_flag)
 282         {
 283           /* If --yacc, then the output is `y.tab.c'. */
 284           short_base_name = xstrdup ("y");
 285         }
 286       else
 287         {
 288           /* Otherwise, the short base name is computed from the input
 289              grammar: `foo/bar.yy' => `bar'.  */
 290           filename_split (infile, &base, &tab, &ext);
 291           short_base_name =
 292             xstrndup (base,
 293                       (strlen (base) - (ext ? strlen (ext) : 0)));
 294         }
 295
 296       /* In these cases, always append `.tab'. */
 297       output_infix = xstrdup (EXT_TAB);
 298
 299       full_base_name = XMALLOC (char,
 300                                 strlen (short_base_name)
 301                                 + strlen (EXT_TAB) + 1);
 302       stpcpy (stpcpy (full_base_name, short_base_name), EXT_TAB);
 303
 304       /* Computes the extensions from the grammar file name.  */
 305       filename_split (infile, &base, &tab, &ext);
 306       if (ext && !yacc_flag)
 307         compute_exts_from_gf (ext);
 308     }
 309 }
 310
 311 /*-------------------------------------------------------.
 312 | Close the open files, compute the output files names.  |
 313 `-------------------------------------------------------*/
 314
 315 void
 316 compute_output_file_names (void)
 317 {
 318   compute_base_names ();
 319
 320   /* If not yet done. */
 321   if (!src_extension)
 322     src_extension = ".c";
 323   if (!header_extension)
 324     header_extension = ".h";
 325
 326   parser_file_name =
 327     spec_outfile ? spec_outfile : stringappend (full_base_name, src_extension);
 328
 329   /* It the defines filename if not given, we create it.  */
 330   if (!spec_defines_file)
 331     spec_defines_file = stringappend (full_base_name, header_extension);
 332
 333   /* It the graph filename if not given, we create it.  */
 334   if (!spec_graph_file)
 335     spec_graph_file = stringappend (short_base_name, ".vcg");
 336
 337   spec_verbose_file = stringappend (short_base_name, EXT_OUTPUT);
 338 }