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