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
  25 #include <error.h>
  26 #include <get-errno.h>
  27
  28 #include "complain.h"
  29 #include "files.h"
  30 #include "getargs.h"
  31 #include "gram.h"
  32
  33 /* From basename.c.  Almost a lie, as it returns a char *. */
  34 const char *base_name (char const *name);
  35
  36 FILE *finput = NULL;
  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 *spec_outfile = NULL;      /* for -o. */
  49 char *spec_file_prefix = NULL;  /* for -b. */
  50 const char *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 = NULL;
  55
  56 uniqstr grammar_file = NULL;
  57 uniqstr current_file = NULL;
  58
  59 static char *full_base_name = NULL;
  60
  61 /* Prefix used to generate output file names.  */
  62 char *short_base_name = 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 | Return a newly allocated string composed of the concatenation of |
  71 | STR1, and STR2.                                                  |
  72 `-----------------------------------------------------------------*/
  73
  74 static char *
  75 concat2 (char const *str1, char const *str2)
  76 {
  77   size_t len = strlen (str1) + strlen (str2);
  78   char *res = XMALLOC (char, len + 1);
  79   char *cp;
  80   cp = stpcpy (res, str1);
  81   cp = stpcpy (cp, str2);
  82   return res;
  83 }
  84
  85 /*-----------------------------------------------------------------.
  86 | Try to open file NAME with mode MODE, and print an error message |
  87 | if fails.                                                        |
  88 `-----------------------------------------------------------------*/
  89
  90 FILE *
  91 xfopen (const char *name, const char *mode)
  92 {
  93   FILE *ptr;
  94
  95   ptr = fopen (name, mode);
  96   if (!ptr)
  97     error (EXIT_FAILURE, get_errno (), _("cannot open file `%s'"), name);
  98
  99   return ptr;
 100 }
 101
 102 /*-------------------------------------------------------------.
 103 | Try to close file PTR, and print an error message if fails.  |
 104 `-------------------------------------------------------------*/
 105
 106 void
 107 xfclose (FILE *ptr)
 108 {
 109   if (ptr == NULL)
 110     return;
 111
 112   if (ferror (ptr))
 113     error (EXIT_FAILURE, 0, _("I/O error"));
 114
 115   if (fclose (ptr) != 0)
 116     error (EXIT_FAILURE, get_errno (), _("cannot close file"));
 117 }
 118 \f
 119
 120 /*----------------------------------------------------------------.
 121 | Compute BASE_NAME, SHORT_BASE_NAME and output files extensions. |
 122 `----------------------------------------------------------------*/
 123
 124 /* Replace all characters FROM by TO in the string IN.
 125    and returns a new allocated string.  */
 126 static char *
 127 tr (const char *in, char from, char to)
 128 {
 129   char *temp;
 130   char *out;
 131
 132   out = XMALLOC (char, strlen (in) + 1);
 133
 134   for (temp = out; *in; in++, out++)
 135     if (*in == from)
 136       *out = to;
 137     else
 138       *out = *in;
 139   *out = 0;
 140   return (temp);
 141 }
 142
 143 /* Computes extensions from the grammar file extension. */
 144 static void
 145 compute_exts_from_gf (const char *ext)
 146 {
 147   src_extension = tr (ext, 'y', 'c');
 148   src_extension = tr (src_extension, 'Y', 'C');
 149   header_extension = tr (ext, 'y', 'h');
 150   header_extension = tr (header_extension, 'Y', 'H');
 151 }
 152
 153 /* Computes extensions from the given c source file extension. */
 154 static void
 155 compute_exts_from_src (const char *ext)
 156 {
 157   /* We use this function when the user specifies `-o' or `--output',
 158      so the extenions must be computed unconditionally from the file name
 159      given by this option.  */
 160   src_extension = xstrdup (ext);
 161   header_extension = tr (ext, 'c', 'h');
 162   header_extension = tr (header_extension, 'C', 'H');
 163 }
 164
 165
 166 /* Decompose FILENAME in four parts: *BASE, *TAB, and *EXT, the fourth
 167    part, (the directory) is ranging from FILENAME to the char before
 168    *BASE, so we don't need an additional parameter.
 169
 170    *EXT points to the last period in the basename, or NULL if none.
 171
 172    If there is no *EXT, *TAB is NULL.  Otherwise, *TAB points to
 173    `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
 174    cannot be equal to *BASE.
 175
 176    None are allocated, they are simply pointers to parts of FILENAME.
 177    Examples:
 178
 179    '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
 180    '.c'
 181
 182    'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
 183
 184    'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
 185
 186    '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
 187
 188    'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
 189
 190    'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
 191
 192    'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL.  */
 193
 194 static void
 195 filename_split (const char *filename,
 196                 const char **base, const char **tab, const char **ext)
 197 {
 198   *base = base_name (filename);
 199
 200   /* Look for the extension, i.e., look for the last dot. */
 201   *ext = strrchr (*base, '.');
 202   *tab = NULL;
 203
 204   /* If there is an exentension, check if there is a `.tab' part right
 205      before.  */
 206   if (*ext
 207       && (*ext - *base) > (int) strlen (".tab")
 208       && (!strncmp (*ext - strlen (".tab"), ".tab", strlen (".tab"))
 209           || !strncmp (*ext - strlen ("_tab"), "_tab", strlen ("_tab"))))
 210     *tab = *ext - strlen (".tab");
 211 }
 212
 213
 214 /* FIXME: Should use xstrndup. */
 215
 216 static void
 217 compute_base_names (void)
 218 {
 219   const char *base, *tab, *ext;
 220
 221   /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
 222      BASE_NAME and SHORT_BASE_NAME are `foo'.
 223
 224      If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
 225      SHORT_BASE_NAME is `foo'.
 226
 227      The precise -o name will be used for FTABLE.  For other output
 228      files, remove the ".c" or ".tab.c" suffix.  */
 229   if (spec_outfile)
 230     {
 231       filename_split (spec_outfile, &base, &tab, &ext);
 232
 233       /* The full base name goes up the EXT, excluding it. */
 234       full_base_name =
 235         xstrndup (spec_outfile,
 236                   (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
 237
 238       /* The short base name goes up to TAB, excluding it.  */
 239       short_base_name =
 240         xstrndup (spec_outfile,
 241                   (strlen (spec_outfile)
 242                    - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
 243
 244       if (ext)
 245         compute_exts_from_src (ext);
 246     }
 247
 248   /* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
 249      and SHORT_BASE_NAME = `foo'.
 250
 251      Construct names from it.  */
 252   else
 253     {
 254       if (spec_file_prefix)
 255         {
 256           /* If --file-prefix=foo was specified, SHORT_BASE_NAME =
 257              `foo'.  */
 258           short_base_name = xstrdup (spec_file_prefix);
 259         }
 260       else if (yacc_flag)
 261         {
 262           /* If --yacc, then the output is `y.tab.c'. */
 263           short_base_name = xstrdup ("y");
 264         }
 265       else
 266         {
 267           /* Otherwise, the short base name is computed from the input
 268              grammar: `foo/bar.yy' => `bar'.  */
 269           filename_split (grammar_file, &base, &tab, &ext);
 270           short_base_name =
 271             xstrndup (base,
 272                       (strlen (base) - (ext ? strlen (ext) : 0)));
 273         }
 274
 275       full_base_name = XMALLOC (char,
 276                                 strlen (short_base_name)
 277                                 + strlen (TAB_EXT) + 1);
 278       stpcpy (stpcpy (full_base_name, short_base_name), TAB_EXT);
 279
 280       /* Computes the extensions from the grammar file name.  */
 281       filename_split (grammar_file, &base, &tab, &ext);
 282       if (ext && !yacc_flag)
 283         compute_exts_from_gf (ext);
 284     }
 285 }
 286
 287 /*-------------------------------------------------------.
 288 | Close the open files, compute the output files names.  |
 289 `-------------------------------------------------------*/
 290
 291 void
 292 compute_output_file_names (void)
 293 {
 294   compute_base_names ();
 295
 296   /* If not yet done. */
 297   if (!src_extension)
 298     src_extension = ".c";
 299   if (!header_extension)
 300     header_extension = ".h";
 301
 302   parser_file_name =
 303     spec_outfile ? spec_outfile : concat2 (full_base_name, src_extension);
 304
 305   /* It the defines filename if not given, we create it.  */
 306   if (!spec_defines_file)
 307     spec_defines_file = concat2 (full_base_name, header_extension);
 308
 309   /* It the graph filename if not given, we create it.  */
 310   if (!spec_graph_file)
 311     spec_graph_file = concat2 (short_base_name, ".vcg");
 312
 313   spec_verbose_file = concat2 (short_base_name, OUTPUT_EXT);
 314 }