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 struniq_t grammar_file = NULL;
  54 struniq_t current_file = NULL;
  55
  56 static char *full_base_name = NULL;
  57
  58 /* Prefix used to generate output file names.  */
  59 char *short_base_name = NULL;
  60
  61 /* C source file extension (the parser source).  */
  62 const char *src_extension = NULL;
  63 /* Header file extension (if option ``-d'' is specified).  */
  64 const char *header_extension = NULL;
  65 \f
  66
  67 /*--------------------------.
  68 | Is SUFFIX ending STRING?  |
  69 `--------------------------*/
  70
  71 int
  72 strsuffix (const char *string, const char *suffix)
  73 {
  74   size_t string_len = strlen (string);
  75   size_t suffix_len = strlen (suffix);
  76   if (suffix_len <= string_len)
  77     return !strcmp (string + string_len - suffix_len, suffix);
  78   else
  79     return 0;
  80 }
  81
  82
  83 /*-----------------------------------------------------------------.
  84 | Return a newly allocated string composed of the concatenation of |
  85 | STRING1, and STRING2.                                            |
  86 `-----------------------------------------------------------------*/
  87
  88 char*
  89 stringappend (const char *string1, const char *string2)
  90 {
  91   size_t len = strlen (string1) + strlen (string2);
  92   char *res = XMALLOC (char, len + 1);
  93   char *cp;
  94   cp = stpcpy (res, string1);
  95   cp = stpcpy (cp, string2);
  96   return res;
  97 }
  98
  99 /*-----------------------------------------------------------------.
 100 | Try to open file NAME with mode MODE, and print an error message |
 101 | if fails.                                                        |
 102 `-----------------------------------------------------------------*/
 103
 104 FILE *
 105 xfopen (const char *name, const char *mode)
 106 {
 107   FILE *ptr;
 108
 109   ptr = fopen (name, mode);
 110   if (!ptr)
 111     error (EXIT_FAILURE, errno, _("cannot open file `%s'"), name);
 112
 113   return ptr;
 114 }
 115
 116 /*-------------------------------------------------------------.
 117 | Try to close file PTR, and print an error message if fails.  |
 118 `-------------------------------------------------------------*/
 119
 120 void
 121 xfclose (FILE *ptr)
 122 {
 123   if (ptr == NULL)
 124     return;
 125
 126   if (ferror (ptr))
 127     error (EXIT_FAILURE, 0, _("I/O error"));
 128
 129   if (fclose (ptr) != 0)
 130     error (EXIT_FAILURE, errno, _("cannot close file"));
 131 }
 132 \f
 133
 134 /*----------------------------------------------------------------.
 135 | Compute BASE_NAME, SHORT_BASE_NAME and output files extensions. |
 136 `----------------------------------------------------------------*/
 137
 138 /* Replace all characters FROM by TO in the string IN.
 139    and returns a new allocated string.  */
 140 static char *
 141 tr (const char *in, char from, char to)
 142 {
 143   char *temp;
 144   char *out;
 145
 146   out = XMALLOC (char, strlen (in) + 1);
 147
 148   for (temp = out; *in; in++, out++)
 149     if (*in == from)
 150       *out = to;
 151     else
 152       *out = *in;
 153   *out = 0;
 154   return (temp);
 155 }
 156
 157 /* Computes extensions from the grammar file extension. */
 158 static void
 159 compute_exts_from_gf (const char *ext)
 160 {
 161   src_extension = tr (ext, 'y', 'c');
 162   src_extension = tr (src_extension, 'Y', 'C');
 163   header_extension = tr (ext, 'y', 'h');
 164   header_extension = tr (header_extension, 'Y', 'H');
 165 }
 166
 167 /* Computes extensions from the given c source file extension. */
 168 static void
 169 compute_exts_from_src (const char *ext)
 170 {
 171   /* We use this function when the user specifies `-o' or `--output',
 172      so the extenions must be computed unconditionally from the file name
 173      given by this option.  */
 174   src_extension = xstrdup (ext);
 175   header_extension = tr (ext, 'c', 'h');
 176   header_extension = tr (header_extension, 'C', 'H');
 177 }
 178
 179
 180 /* Decompose FILENAME in four parts: *BASE, *TAB, and *EXT, the fourth
 181    part, (the directory) is ranging from FILENAME to the char before
 182    *BASE, so we don't need an additional parameter.
 183
 184    *EXT points to the last period in the basename, or NULL if none.
 185
 186    If there is no *EXT, *TAB is NULL.  Otherwise, *TAB points to
 187    `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
 188    cannot be equal to *BASE.
 189
 190    None are allocated, they are simply pointers to parts of FILENAME.
 191    Examples:
 192
 193    '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
 194    '.c'
 195
 196    'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
 197
 198    'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
 199
 200    '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
 201
 202    'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
 203
 204    'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
 205
 206    'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL.  */
 207
 208 static void
 209 filename_split (const char *filename,
 210                 const char **base, const char **tab, const char **ext)
 211 {
 212   *base = base_name (filename);
 213
 214   /* Look for the extension, i.e., look for the last dot. */
 215   *ext = strrchr (*base, '.');
 216   *tab = NULL;
 217
 218   /* If there is an exentension, check if there is a `.tab' part right
 219      before.  */
 220   if (*ext
 221       && (*ext - *base) > (int) strlen (".tab")
 222       && (!strncmp (*ext - strlen (".tab"), ".tab", strlen (".tab"))
 223           || !strncmp (*ext - strlen ("_tab"), "_tab", strlen ("_tab"))))
 224     *tab = *ext - strlen (".tab");
 225 }
 226
 227
 228 /* FIXME: Should use xstrndup. */
 229
 230 static void
 231 compute_base_names (void)
 232 {
 233   const char *base, *tab, *ext;
 234
 235   /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
 236      BASE_NAME and SHORT_BASE_NAME are `foo'.
 237
 238      If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
 239      SHORT_BASE_NAME is `foo'.
 240
 241      The precise -o name will be used for FTABLE.  For other output
 242      files, remove the ".c" or ".tab.c" suffix.  */
 243   if (spec_outfile)
 244     {
 245       filename_split (spec_outfile, &base, &tab, &ext);
 246
 247       /* The full base name goes up the EXT, excluding it. */
 248       full_base_name =
 249         xstrndup (spec_outfile,
 250                   (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
 251
 252       /* The short base name goes up to TAB, excluding it.  */
 253       short_base_name =
 254         xstrndup (spec_outfile,
 255                   (strlen (spec_outfile)
 256                    - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
 257
 258       if (ext)
 259         compute_exts_from_src (ext);
 260     }
 261
 262   /* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
 263      and SHORT_BASE_NAME = `foo'.
 264
 265      Construct names from it.  */
 266   else
 267     {
 268       if (spec_file_prefix)
 269         {
 270           /* If --file-prefix=foo was specified, SHORT_BASE_NAME =
 271              `foo'.  */
 272           short_base_name = xstrdup (spec_file_prefix);
 273         }
 274       else if (yacc_flag)
 275         {
 276           /* If --yacc, then the output is `y.tab.c'. */
 277           short_base_name = xstrdup ("y");
 278         }
 279       else
 280         {
 281           /* Otherwise, the short base name is computed from the input
 282              grammar: `foo/bar.yy' => `bar'.  */
 283           filename_split (grammar_file, &base, &tab, &ext);
 284           short_base_name =
 285             xstrndup (base,
 286                       (strlen (base) - (ext ? strlen (ext) : 0)));
 287         }
 288
 289       full_base_name = XMALLOC (char,
 290                                 strlen (short_base_name)
 291                                 + strlen (EXT_TAB) + 1);
 292       stpcpy (stpcpy (full_base_name, short_base_name), EXT_TAB);
 293
 294       /* Computes the extensions from the grammar file name.  */
 295       filename_split (grammar_file, &base, &tab, &ext);
 296       if (ext && !yacc_flag)
 297         compute_exts_from_gf (ext);
 298     }
 299 }
 300
 301 /*-------------------------------------------------------.
 302 | Close the open files, compute the output files names.  |
 303 `-------------------------------------------------------*/
 304
 305 void
 306 compute_output_file_names (void)
 307 {
 308   compute_base_names ();
 309
 310   /* If not yet done. */
 311   if (!src_extension)
 312     src_extension = ".c";
 313   if (!header_extension)
 314     header_extension = ".h";
 315
 316   parser_file_name =
 317     spec_outfile ? spec_outfile : stringappend (full_base_name, src_extension);
 318
 319   /* It the defines filename if not given, we create it.  */
 320   if (!spec_defines_file)
 321     spec_defines_file = stringappend (full_base_name, header_extension);
 322
 323   /* It the graph filename if not given, we create it.  */
 324   if (!spec_graph_file)
 325     spec_graph_file = stringappend (short_base_name, ".vcg");
 326
 327   spec_verbose_file = stringappend (short_base_name, EXT_OUTPUT);
 328 }