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 #include <quote.h>
  29
  30 #include "complain.h"
  31 #include "files.h"
  32 #include "getargs.h"
  33 #include "gram.h"
  34
  35 /* From basename.c.  Almost a lie, as it returns a char *. */
  36 const char *base_name (char const *name);
  37
  38 FILE *finput = NULL;
  39
  40 struct obstack pre_prologue_obstack;
  41 struct obstack post_prologue_obstack;
  42
  43 /* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
  44    tempting, but don't do that: for the time being our handling of the
  45    %directive vs --option leaves precedence to the options by deciding
  46    that if a %directive sets a variable which is really set (i.e., not
  47    NULL), then the %directive is ignored.  As a result, %name-prefix,
  48    for instance, will not be honored.  */
  49
  50 char *spec_outfile = NULL;      /* for -o. */
  51 char *spec_file_prefix = NULL;  /* for -b. */
  52 const char *spec_name_prefix = NULL;    /* for -p. */
  53 char *spec_verbose_file = NULL;   /* for --verbose. */
  54 char *spec_graph_file = NULL;   /* for -g. */
  55 char *spec_defines_file = NULL; /* for --defines. */
  56 char *parser_file_name = NULL;
  57
  58 uniqstr grammar_file = NULL;
  59 uniqstr current_file = NULL;
  60
  61 static char *full_base_name = NULL;
  62
  63 /* Prefix used to generate output file names.  */
  64 char *short_base_name = NULL;
  65
  66 /* C source file extension (the parser source).  */
  67 const char *src_extension = NULL;
  68 /* Header file extension (if option ``-d'' is specified).  */
  69 const char *header_extension = NULL;
  70 \f
  71 /*-----------------------------------------------------------------.
  72 | Return a newly allocated string composed of the concatenation of |
  73 | STR1, and STR2.                                                  |
  74 `-----------------------------------------------------------------*/
  75
  76 static char *
  77 concat2 (char const *str1, char const *str2)
  78 {
  79   size_t len = strlen (str1) + strlen (str2);
  80   char *res = xmalloc (len + 1);
  81   char *cp;
  82   cp = stpcpy (res, str1);
  83   cp = stpcpy (cp, str2);
  84   return res;
  85 }
  86
  87 /*-----------------------------------------------------------------.
  88 | Try to open file NAME with mode MODE, and print an error message |
  89 | if fails.                                                        |
  90 `-----------------------------------------------------------------*/
  91
  92 FILE *
  93 xfopen (const char *name, const char *mode)
  94 {
  95   FILE *ptr;
  96
  97   ptr = fopen (name, mode);
  98   if (!ptr)
  99     error (EXIT_FAILURE, get_errno (), _("cannot open file `%s'"), name);
 100
 101   return ptr;
 102 }
 103
 104 /*-------------------------------------------------------------.
 105 | Try to close file PTR, and print an error message if fails.  |
 106 `-------------------------------------------------------------*/
 107
 108 void
 109 xfclose (FILE *ptr)
 110 {
 111   if (ptr == NULL)
 112     return;
 113
 114   if (ferror (ptr))
 115     error (EXIT_FAILURE, 0, _("I/O error"));
 116
 117   if (fclose (ptr) != 0)
 118     error (EXIT_FAILURE, get_errno (), _("cannot close file"));
 119 }
 120 \f
 121
 122 /*---------------------------------------------------------------------.
 123 | Compute FULL_BASE_NAME, SHORT_BASE_NAME and output files extensions. |
 124 `---------------------------------------------------------------------*/
 125
 126 /* Replace all characters FROM by TO in the string IN.
 127    and returns a new allocated string.  */
 128 static char *
 129 tr (const char *in, char from, char to)
 130 {
 131   char *temp;
 132   char *out = xmalloc (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 extension, check if there is a `.tab' part right
 205      before.  */
 206   if (*ext)
 207     {
 208       size_t baselen = *ext - *base;
 209       size_t dottablen = 4;
 210       if (dottablen < baselen
 211           && (strncmp (*ext - dottablen, ".tab", dottablen) == 0
 212               || strncmp (*ext - dottablen, "_tab", dottablen) == 0))
 213         *tab = *ext - dottablen;
 214     }
 215 }
 216
 217
 218 /* FIXME: Should use xstrndup. */
 219
 220 static void
 221 compute_base_names (void)
 222 {
 223   const char *base, *tab, *ext;
 224
 225   /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
 226      FULL_BASE_NAME and SHORT_BASE_NAME are `foo'.
 227
 228      If --output=foo.tab.c was specified, FULL_BASE_NAME is `foo.tab'
 229      and SHORT_BASE_NAME is `foo'.
 230
 231      The precise -o name will be used for FTABLE.  For other output
 232      files, remove the ".c" or ".tab.c" suffix.  */
 233   if (spec_outfile)
 234     {
 235       filename_split (spec_outfile, &base, &tab, &ext);
 236
 237       /* The full base name goes up the EXT, excluding it. */
 238       full_base_name =
 239         xstrndup (spec_outfile,
 240                   (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
 241
 242       /* The short base name goes up to TAB, excluding it.  */
 243       short_base_name =
 244         xstrndup (spec_outfile,
 245                   (strlen (spec_outfile)
 246                    - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
 247
 248       if (ext)
 249         compute_exts_from_src (ext);
 250     }
 251
 252   /* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
 253      and SHORT_BASE_NAME = `foo'.
 254
 255      Construct names from it.  */
 256   else
 257     {
 258       if (spec_file_prefix)
 259         {
 260           /* If --file-prefix=foo was specified, SHORT_BASE_NAME =
 261              `foo'.  */
 262           short_base_name = xstrdup (spec_file_prefix);
 263         }
 264       else if (yacc_flag)
 265         {
 266           /* If --yacc, then the output is `y.tab.c'. */
 267           short_base_name = xstrdup ("y");
 268         }
 269       else
 270         {
 271           /* Otherwise, the short base name is computed from the input
 272              grammar: `foo/bar.yy' => `bar'.  */
 273           filename_split (grammar_file, &base, &tab, &ext);
 274           short_base_name =
 275             xstrndup (base,
 276                       (strlen (base) - (ext ? strlen (ext) : 0)));
 277         }
 278
 279       full_base_name = xmalloc (strlen (short_base_name)
 280                                 + strlen (TAB_EXT) + 1);
 281       stpcpy (stpcpy (full_base_name, short_base_name), TAB_EXT);
 282
 283       /* Computes the extensions from the grammar file name.  */
 284       filename_split (grammar_file, &base, &tab, &ext);
 285       if (ext && !yacc_flag)
 286         compute_exts_from_gf (ext);
 287     }
 288 }
 289
 290
 291 /* Compute the output file names.  Warn if we detect conflicting
 292    outputs to the same file.  */
 293
 294 void
 295 compute_output_file_names (void)
 296 {
 297   char const *name[4];
 298   int i;
 299   int j;
 300   int names = 0;
 301
 302   compute_base_names ();
 303
 304   /* If not yet done. */
 305   if (!src_extension)
 306     src_extension = ".c";
 307   if (!header_extension)
 308     header_extension = ".h";
 309
 310   name[names++] = parser_file_name =
 311     spec_outfile ? spec_outfile : concat2 (full_base_name, src_extension);
 312
 313   if (defines_flag)
 314     {
 315       if (! spec_defines_file)
 316         spec_defines_file = concat2 (full_base_name, header_extension);
 317       name[names++] = spec_defines_file;
 318     }
 319
 320   if (graph_flag)
 321     {
 322       if (! spec_graph_file)
 323         spec_graph_file = concat2 (short_base_name, ".vcg");
 324       name[names++] = spec_graph_file;
 325     }
 326
 327   if (report_flag)
 328     {
 329       spec_verbose_file = concat2 (short_base_name, OUTPUT_EXT);
 330       name[names++] = spec_verbose_file;
 331     }
 332
 333   for (j = 0; j < names; j++)
 334     for (i = 0; i < j; i++)
 335       if (strcmp (name[i], name[j]) == 0)
 336         warn (_("conflicting outputs to file %s"), quote (name[i]));
 337 }