src/files.c

   1 /* Open and close files for Bison.
   2
   3    Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002
   4    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., 59 Temple Place - Suite 330, Boston, MA
  21    02111-1307, USA.  */
  22
  23
  24 #include "system.h"
  25
  26 #include <error.h>
  27 #include <get-errno.h>
  28
  29 #include "complain.h"
  30 #include "files.h"
  31 #include "getargs.h"
  32 #include "gram.h"
  33
  34 /* From basename.c.  Almost a lie, as it returns a char *. */
  35 const char *base_name (char const *name);
  36
  37 FILE *finput = NULL;
  38
  39 struct obstack pre_prologue_obstack;
  40 struct obstack post_prologue_obstack;
  41
  42 /* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
  43    tempting, but don't do that: for the time being our handling of the
  44    %directive vs --option leaves precedence to the options by deciding
  45    that if a %directive sets a variable which is really set (i.e., not
  46    NULL), then the %directive is ignored.  As a result, %name-prefix,
  47    for instance, will not be honored.  */
  48
  49 char *spec_outfile = NULL;      /* for -o. */
  50 char *spec_file_prefix = NULL;  /* for -b. */
  51 const char *spec_name_prefix = NULL;    /* for -p. */
  52 char *spec_verbose_file = NULL;   /* for --verbose. */
  53 char *spec_graph_file = NULL;   /* for -g. */
  54 char *spec_defines_file = NULL; /* for --defines. */
  55 char *parser_file_name = NULL;
  56
  57 uniqstr grammar_file = NULL;
  58 uniqstr current_file = NULL;
  59
  60 static char *full_base_name = NULL;
  61
  62 /* Prefix used to generate output file names.  */
  63 char *short_base_name = NULL;
  64
  65 /* C source file extension (the parser source).  */
  66 const char *src_extension = NULL;
  67 /* Header file extension (if option ``-d'' is specified).  */
  68 const char *header_extension = NULL;
  69 \f
  70 /*-----------------------------------------------------------------.
  71 | Return a newly allocated string composed of the concatenation of |
  72 | STR1, and STR2.                                                  |
  73 `-----------------------------------------------------------------*/
  74
  75 static char *
  76 concat2 (char const *str1, char const *str2)
  77 {
  78   size_t len = strlen (str1) + strlen (str2);
  79   char *res = xmalloc (len + 1);
  80   char *cp;
  81   cp = stpcpy (res, str1);
  82   cp = stpcpy (cp, str2);
  83   return res;
  84 }
  85
  86 /*-----------------------------------------------------------------.
  87 | Try to open file NAME with mode MODE, and print an error message |
  88 | if fails.                                                        |
  89 `-----------------------------------------------------------------*/
  90
  91 FILE *
  92 xfopen (const char *name, const char *mode)
  93 {
  94   FILE *ptr;
  95
  96   ptr = fopen (name, mode);
  97   if (!ptr)
  98     error (EXIT_FAILURE, get_errno (), _("cannot open file `%s'"), name);
  99
 100   return ptr;
 101 }
 102
 103 /*-------------------------------------------------------------.
 104 | Try to close file PTR, and print an error message if fails.  |
 105 `-------------------------------------------------------------*/
 106
 107 void
 108 xfclose (FILE *ptr)
 109 {
 110   if (ptr == NULL)
 111     return;
 112
 113   if (ferror (ptr))
 114     error (EXIT_FAILURE, 0, _("I/O error"));
 115
 116   if (fclose (ptr) != 0)
 117     error (EXIT_FAILURE, get_errno (), _("cannot close file"));
 118 }
 119 \f
 120
 121 /*----------------------------------------------------------------.
 122 | Compute BASE_NAME, SHORT_BASE_NAME and output files extensions. |
 123 `----------------------------------------------------------------*/
 124
 125 /* Replace all characters FROM by TO in the string IN.
 126    and returns a new allocated string.  */
 127 static char *
 128 tr (const char *in, char from, char to)
 129 {
 130   char *temp;
 131   char *out = xmalloc (strlen (in) + 1);
 132
 133   for (temp = out; *in; in++, out++)
 134     if (*in == from)
 135       *out = to;
 136     else
 137       *out = *in;
 138   *out = 0;
 139   return (temp);
 140 }
 141
 142 /* Computes extensions from the grammar file extension. */
 143 static void
 144 compute_exts_from_gf (const char *ext)
 145 {
 146   src_extension = tr (ext, 'y', 'c');
 147   src_extension = tr (src_extension, 'Y', 'C');
 148   header_extension = tr (ext, 'y', 'h');
 149   header_extension = tr (header_extension, 'Y', 'H');
 150 }
 151
 152 /* Computes extensions from the given c source file extension. */
 153 static void
 154 compute_exts_from_src (const char *ext)
 155 {
 156   /* We use this function when the user specifies `-o' or `--output',
 157      so the extenions must be computed unconditionally from the file name
 158      given by this option.  */
 159   src_extension = xstrdup (ext);
 160   header_extension = tr (ext, 'c', 'h');
 161   header_extension = tr (header_extension, 'C', 'H');
 162 }
 163
 164
 165 /* Decompose FILENAME in four parts: *BASE, *TAB, and *EXT, the fourth
 166    part, (the directory) is ranging from FILENAME to the char before
 167    *BASE, so we don't need an additional parameter.
 168
 169    *EXT points to the last period in the basename, or NULL if none.
 170
 171    If there is no *EXT, *TAB is NULL.  Otherwise, *TAB points to
 172    `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
 173    cannot be equal to *BASE.
 174
 175    None are allocated, they are simply pointers to parts of FILENAME.
 176    Examples:
 177
 178    '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
 179    '.c'
 180
 181    'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
 182
 183    'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
 184
 185    '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
 186
 187    'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
 188
 189    'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
 190
 191    'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL.  */
 192
 193 static void
 194 filename_split (const char *filename,
 195                 const char **base, const char **tab, const char **ext)
 196 {
 197   *base = base_name (filename);
 198
 199   /* Look for the extension, i.e., look for the last dot. */
 200   *ext = strrchr (*base, '.');
 201   *tab = NULL;
 202
 203   /* If there is an extension, check if there is a `.tab' part right
 204      before.  */
 205   if (*ext)
 206     {
 207       size_t baselen = *ext - *base;
 208       size_t dottablen = 4;
 209       if (dottablen < baselen
 210           && (strncmp (*ext - dottablen, ".tab", dottablen) == 0
 211               || strncmp (*ext - dottablen, "_tab", dottablen) == 0))
 212         *tab = *ext - dottablen;
 213     }
 214 }
 215
 216
 217 /* FIXME: Should use xstrndup. */
 218
 219 static void
 220 compute_base_names (void)
 221 {
 222   const char *base, *tab, *ext;
 223
 224   /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
 225      BASE_NAME and SHORT_BASE_NAME are `foo'.
 226
 227      If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
 228      SHORT_BASE_NAME is `foo'.
 229
 230      The precise -o name will be used for FTABLE.  For other output
 231      files, remove the ".c" or ".tab.c" suffix.  */
 232   if (spec_outfile)
 233     {
 234       filename_split (spec_outfile, &base, &tab, &ext);
 235
 236       /* The full base name goes up the EXT, excluding it. */
 237       full_base_name =
 238         xstrndup (spec_outfile,
 239                   (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
 240
 241       /* The short base name goes up to TAB, excluding it.  */
 242       short_base_name =
 243         xstrndup (spec_outfile,
 244                   (strlen (spec_outfile)
 245                    - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
 246
 247       if (ext)
 248         compute_exts_from_src (ext);
 249     }
 250
 251   /* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
 252      and SHORT_BASE_NAME = `foo'.
 253
 254      Construct names from it.  */
 255   else
 256     {
 257       if (spec_file_prefix)
 258         {
 259           /* If --file-prefix=foo was specified, SHORT_BASE_NAME =
 260              `foo'.  */
 261           short_base_name = xstrdup (spec_file_prefix);
 262         }
 263       else if (yacc_flag)
 264         {
 265           /* If --yacc, then the output is `y.tab.c'. */
 266           short_base_name = xstrdup ("y");
 267         }
 268       else
 269         {
 270           /* Otherwise, the short base name is computed from the input
 271              grammar: `foo/bar.yy' => `bar'.  */
 272           filename_split (grammar_file, &base, &tab, &ext);
 273           short_base_name =
 274             xstrndup (base,
 275                       (strlen (base) - (ext ? strlen (ext) : 0)));
 276         }
 277
 278       full_base_name = xmalloc (strlen (short_base_name)
 279                                 + strlen (TAB_EXT) + 1);
 280       stpcpy (stpcpy (full_base_name, short_base_name), TAB_EXT);
 281
 282       /* Computes the extensions from the grammar file name.  */
 283       filename_split (grammar_file, &base, &tab, &ext);
 284       if (ext && !yacc_flag)
 285         compute_exts_from_gf (ext);
 286     }
 287 }
 288
 289 /*-------------------------------------------------------.
 290 | Close the open files, compute the output files names.  |
 291 `-------------------------------------------------------*/
 292
 293 void
 294 compute_output_file_names (void)
 295 {
 296   compute_base_names ();
 297
 298   /* If not yet done. */
 299   if (!src_extension)
 300     src_extension = ".c";
 301   if (!header_extension)
 302     header_extension = ".h";
 303
 304   parser_file_name =
 305     spec_outfile ? spec_outfile : concat2 (full_base_name, src_extension);
 306
 307   /* It the defines filename if not given, we create it.  */
 308   if (!spec_defines_file)
 309     spec_defines_file = concat2 (full_base_name, header_extension);
 310
 311   /* It the graph filename if not given, we create it.  */
 312   if (!spec_graph_file)
 313     spec_graph_file = concat2 (short_base_name, ".vcg");
 314
 315   spec_verbose_file = concat2 (short_base_name, OUTPUT_EXT);
 316 }