src/files.c

   1 /* Open and close files for Bison.
   2
   3    Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004, 2005
   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., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23
  24 #include "system.h"
  25
  26 #include <error.h>
  27 #include <get-errno.h>
  28 #include <quote.h>
  29 #include <xstrndup.h>
  30
  31 #include "complain.h"
  32 #include "dirname.h"
  33 #include "files.h"
  34 #include "getargs.h"
  35 #include "gram.h"
  36 #include "stdio-safer.h"
  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 const *spec_outfile = NULL;       /* for -o. */
  49 char const *spec_file_prefix = NULL;   /* for -b. */
  50 char const *spec_name_prefix = NULL;   /* for -p. */
  51 char const *spec_verbose_file = NULL;  /* for --verbose. */
  52 char const *spec_graph_file = NULL;    /* for -g. */
  53 char const *spec_defines_file = NULL;  /* for --defines. */
  54 char const *parser_file_name;
  55
  56 uniqstr grammar_file = NULL;
  57 uniqstr current_file = NULL;
  58
  59 /* If --output=dir/foo.c was specified,
  60    DIR_PREFIX is `dir/' and ALL_BUT_EXT and ALL_BUT_TAB_EXT are `dir/foo'.
  61
  62    If --output=dir/foo.tab.c was specified, DIR_PREFIX is `dir/',
  63    ALL_BUT_EXT is `dir/foo.tab', and ALL_BUT_TAB_EXT is `dir/foo'.
  64
  65    If --output was not specified but --file-prefix=dir/foo was specified,
  66    ALL_BUT_EXT = `foo.tab' and ALL_BUT_TAB_EXT = `foo'.
  67
  68    If neither --output nor --file was specified but the input grammar
  69    is name dir/foo.y, ALL_BUT_EXT and ALL_BUT_TAB_EXT are `foo'.
  70
  71    If neither --output nor --file was specified, DIR_PREFIX is the
  72    empty string (meaning the current directory); otherwise it is
  73    `dir/'.  */
  74
  75 static char const *all_but_ext;
  76 static char const *all_but_tab_ext;
  77 char const *dir_prefix;
  78
  79 /* C source file extension (the parser source).  */
  80 static char const *src_extension = NULL;
  81 /* Header file extension (if option ``-d'' is specified).  */
  82 static char const *header_extension = NULL;
  83 \f
  84 /*-----------------------------------------------------------------.
  85 | Return a newly allocated string composed of the concatenation of |
  86 | STR1, and STR2.                                                  |
  87 `-----------------------------------------------------------------*/
  88
  89 static char *
  90 concat2 (char const *str1, char const *str2)
  91 {
  92   size_t len = strlen (str1) + strlen (str2);
  93   char *res = xmalloc (len + 1);
  94   char *cp;
  95   cp = stpcpy (res, str1);
  96   cp = stpcpy (cp, str2);
  97   return res;
  98 }
  99
 100 /*-----------------------------------------------------------------.
 101 | Try to open file NAME with mode MODE, and print an error message |
 102 | if fails.                                                        |
 103 `-----------------------------------------------------------------*/
 104
 105 FILE *
 106 xfopen (const char *name, const char *mode)
 107 {
 108   FILE *ptr;
 109
 110   ptr = fopen_safer (name, mode);
 111   if (!ptr)
 112     error (EXIT_FAILURE, get_errno (), _("cannot open file `%s'"), name);
 113
 114   return ptr;
 115 }
 116
 117 /*-------------------------------------------------------------.
 118 | Try to close file PTR, and print an error message if fails.  |
 119 `-------------------------------------------------------------*/
 120
 121 void
 122 xfclose (FILE *ptr)
 123 {
 124   if (ptr == NULL)
 125     return;
 126
 127   if (ferror (ptr))
 128     error (EXIT_FAILURE, 0, _("I/O error"));
 129
 130   if (fclose (ptr) != 0)
 131     error (EXIT_FAILURE, get_errno (), _("cannot close file"));
 132 }
 133 \f
 134
 135 /*------------------------------------------------------------------.
 136 | Compute ALL_BUT_EXT, ALL_BUT_TAB_EXT and output files extensions. |
 137 `------------------------------------------------------------------*/
 138
 139 /* Replace all characters FROM by TO in the string IN.
 140    and returns a new allocated string.  */
 141 static char *
 142 tr (const char *in, char from, char to)
 143 {
 144   char *temp;
 145   char *out = xmalloc (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 /* Compute 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 /* Compute 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 FILE_NAME in four parts: *BASE, *TAB, and *EXT, the fourth
 180    part, (the directory) is ranging from FILE_NAME 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 FILE_NAME.
 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 file_name_split (const char *file_name,
 209                  const char **base, const char **tab, const char **ext)
 210 {
 211   *base = base_name (file_name);
 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 extension, check if there is a `.tab' part right
 218      before.  */
 219   if (*ext)
 220     {
 221       size_t baselen = *ext - *base;
 222       size_t dottablen = 4;
 223       if (dottablen < baselen
 224           && (strncmp (*ext - dottablen, ".tab", dottablen) == 0
 225               || strncmp (*ext - dottablen, "_tab", dottablen) == 0))
 226         *tab = *ext - dottablen;
 227     }
 228 }
 229
 230
 231 static void
 232 compute_file_name_parts (void)
 233 {
 234   const char *base, *tab, *ext;
 235
 236   /* Compute ALL_BUT_EXT and ALL_BUT_TAB_EXT from SPEC_OUTFILE
 237      or GRAMMAR_FILE.
 238
 239      The precise -o name will be used for FTABLE.  For other output
 240      files, remove the ".c" or ".tab.c" suffix.  */
 241   if (spec_outfile)
 242     {
 243       file_name_split (spec_outfile, &base, &tab, &ext);
 244       dir_prefix = xstrndup (spec_outfile, base - spec_outfile);
 245
 246       /* ALL_BUT_EXT goes up the EXT, excluding it. */
 247       all_but_ext =
 248         xstrndup (spec_outfile,
 249                   (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
 250
 251       /* ALL_BUT_TAB_EXT goes up to TAB, excluding it.  */
 252       all_but_tab_ext =
 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   else
 261     {
 262       file_name_split (grammar_file, &base, &tab, &ext);
 263
 264       if (spec_file_prefix)
 265         {
 266          /* If --file-prefix=foo was specified, ALL_BUT_TAB_EXT =
 267              `foo'.  */
 268          dir_prefix = xstrndup (grammar_file, base - grammar_file);
 269          all_but_tab_ext = xstrdup (spec_file_prefix);
 270         }
 271       else if (yacc_flag)
 272         {
 273           /* If --yacc, then the output is `y.tab.c'. */
 274          dir_prefix = "";
 275          all_but_tab_ext = "y";
 276         }
 277       else
 278         {
 279          /* Otherwise, ALL_BUT_TAB_EXT is computed from the input
 280              grammar: `foo/bar.yy' => `bar'.  */
 281          dir_prefix = "";
 282          all_but_tab_ext =
 283             xstrndup (base,
 284                       (strlen (base) - (ext ? strlen (ext) : 0)));
 285         }
 286
 287       all_but_ext = concat2 (all_but_tab_ext, TAB_EXT);
 288
 289       /* Compute the extensions from the grammar file name.  */
 290       if (ext && !yacc_flag)
 291         compute_exts_from_gf (ext);
 292     }
 293 }
 294
 295
 296 /* Compute the output file names.  Warn if we detect conflicting
 297    outputs to the same file.  */
 298
 299 void
 300 compute_output_file_names (void)
 301 {
 302   char const *name[4];
 303   int i;
 304   int j;
 305   int names = 0;
 306
 307   compute_file_name_parts ();
 308
 309   /* If not yet done. */
 310   if (!src_extension)
 311     src_extension = ".c";
 312   if (!header_extension)
 313     header_extension = ".h";
 314
 315   name[names++] = parser_file_name =
 316     spec_outfile ? spec_outfile : concat2 (all_but_ext, src_extension);
 317
 318   if (defines_flag)
 319     {
 320       if (! spec_defines_file)
 321        spec_defines_file = concat2 (all_but_ext, header_extension);
 322       name[names++] = spec_defines_file;
 323     }
 324
 325   if (graph_flag)
 326     {
 327       if (! spec_graph_file)
 328        spec_graph_file = concat2 (all_but_tab_ext, ".vcg");
 329       name[names++] = spec_graph_file;
 330     }
 331
 332   if (report_flag)
 333     {
 334       spec_verbose_file = concat2 (all_but_tab_ext, OUTPUT_EXT);
 335       name[names++] = spec_verbose_file;
 336     }
 337
 338   for (j = 0; j < names; j++)
 339     for (i = 0; i < j; i++)
 340       if (strcmp (name[i], name[j]) == 0)
 341         warn (_("conflicting outputs to file %s"), quote (name[i]));
 342 }