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https://git.savannah.gnu.org/git/bison.git
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340 lines
9.5 KiB
C
340 lines
9.5 KiB
C
/* Open and close files for Bison.
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Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004, 2005
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Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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Bison is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Bison is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bison; see the file COPYING. If not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "system.h"
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#include <error.h>
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#include <get-errno.h>
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#include <quote.h>
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#include <xstrndup.h>
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#include "complain.h"
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#include "files.h"
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#include "getargs.h"
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#include "gram.h"
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#include "stdio-safer.h"
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/* From basename.c. Almost a lie, as it returns a char *. */
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const char *base_name (char const *name);
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FILE *finput = NULL;
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struct obstack pre_prologue_obstack;
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struct obstack post_prologue_obstack;
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/* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
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tempting, but don't do that: for the time being our handling of the
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%directive vs --option leaves precedence to the options by deciding
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that if a %directive sets a variable which is really set (i.e., not
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NULL), then the %directive is ignored. As a result, %name-prefix,
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for instance, will not be honored. */
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char *spec_outfile = NULL; /* for -o. */
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char *spec_file_prefix = NULL; /* for -b. */
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const char *spec_name_prefix = NULL; /* for -p. */
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char *spec_verbose_file = NULL; /* for --verbose. */
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char *spec_graph_file = NULL; /* for -g. */
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char *spec_defines_file = NULL; /* for --defines. */
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char *parser_file_name = NULL;
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uniqstr grammar_file = NULL;
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uniqstr current_file = NULL;
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static char *full_base_name = NULL;
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/* Prefix used to generate output file names. */
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char *short_base_name = NULL;
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/* C source file extension (the parser source). */
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const char *src_extension = NULL;
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/* Header file extension (if option ``-d'' is specified). */
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const char *header_extension = NULL;
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/*-----------------------------------------------------------------.
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| Return a newly allocated string composed of the concatenation of |
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| STR1, and STR2. |
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`-----------------------------------------------------------------*/
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static char *
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concat2 (char const *str1, char const *str2)
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{
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size_t len = strlen (str1) + strlen (str2);
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char *res = xmalloc (len + 1);
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char *cp;
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cp = stpcpy (res, str1);
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cp = stpcpy (cp, str2);
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return res;
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}
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/*-----------------------------------------------------------------.
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| Try to open file NAME with mode MODE, and print an error message |
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| if fails. |
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`-----------------------------------------------------------------*/
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FILE *
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xfopen (const char *name, const char *mode)
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{
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FILE *ptr;
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ptr = fopen_safer (name, mode);
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if (!ptr)
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error (EXIT_FAILURE, get_errno (), _("cannot open file `%s'"), name);
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return ptr;
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}
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/*-------------------------------------------------------------.
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| Try to close file PTR, and print an error message if fails. |
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`-------------------------------------------------------------*/
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void
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xfclose (FILE *ptr)
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{
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if (ptr == NULL)
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return;
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if (ferror (ptr))
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error (EXIT_FAILURE, 0, _("I/O error"));
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if (fclose (ptr) != 0)
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error (EXIT_FAILURE, get_errno (), _("cannot close file"));
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}
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/*---------------------------------------------------------------------.
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| Compute FULL_BASE_NAME, SHORT_BASE_NAME and output files extensions. |
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`---------------------------------------------------------------------*/
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/* Replace all characters FROM by TO in the string IN.
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and returns a new allocated string. */
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static char *
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tr (const char *in, char from, char to)
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{
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char *temp;
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char *out = xmalloc (strlen (in) + 1);
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for (temp = out; *in; in++, out++)
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if (*in == from)
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*out = to;
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else
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*out = *in;
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*out = 0;
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return (temp);
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}
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/* Compute extensions from the grammar file extension. */
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static void
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compute_exts_from_gf (const char *ext)
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{
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src_extension = tr (ext, 'y', 'c');
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src_extension = tr (src_extension, 'Y', 'C');
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header_extension = tr (ext, 'y', 'h');
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header_extension = tr (header_extension, 'Y', 'H');
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}
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/* Compute extensions from the given c source file extension. */
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static void
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compute_exts_from_src (const char *ext)
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{
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/* We use this function when the user specifies `-o' or `--output',
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so the extenions must be computed unconditionally from the file name
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given by this option. */
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src_extension = xstrdup (ext);
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header_extension = tr (ext, 'c', 'h');
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header_extension = tr (header_extension, 'C', 'H');
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}
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/* Decompose FILENAME in four parts: *BASE, *TAB, and *EXT, the fourth
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part, (the directory) is ranging from FILENAME to the char before
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*BASE, so we don't need an additional parameter.
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*EXT points to the last period in the basename, or NULL if none.
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If there is no *EXT, *TAB is NULL. Otherwise, *TAB points to
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`.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
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cannot be equal to *BASE.
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None are allocated, they are simply pointers to parts of FILENAME.
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Examples:
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'/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
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'.c'
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'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
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'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
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'.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
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'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
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'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
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'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL. */
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static void
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filename_split (const char *filename,
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const char **base, const char **tab, const char **ext)
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{
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*base = base_name (filename);
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/* Look for the extension, i.e., look for the last dot. */
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*ext = strrchr (*base, '.');
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*tab = NULL;
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/* If there is an extension, check if there is a `.tab' part right
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before. */
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if (*ext)
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{
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size_t baselen = *ext - *base;
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size_t dottablen = 4;
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if (dottablen < baselen
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&& (strncmp (*ext - dottablen, ".tab", dottablen) == 0
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|| strncmp (*ext - dottablen, "_tab", dottablen) == 0))
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*tab = *ext - dottablen;
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}
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}
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/* FIXME: Should use xstrndup. */
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static void
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compute_base_names (void)
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{
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const char *base, *tab, *ext;
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/* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
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FULL_BASE_NAME and SHORT_BASE_NAME are `foo'.
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If --output=foo.tab.c was specified, FULL_BASE_NAME is `foo.tab'
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and SHORT_BASE_NAME is `foo'.
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The precise -o name will be used for FTABLE. For other output
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files, remove the ".c" or ".tab.c" suffix. */
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if (spec_outfile)
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{
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filename_split (spec_outfile, &base, &tab, &ext);
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/* The full base name goes up the EXT, excluding it. */
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full_base_name =
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xstrndup (spec_outfile,
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(strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
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/* The short base name goes up to TAB, excluding it. */
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short_base_name =
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xstrndup (spec_outfile,
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(strlen (spec_outfile)
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- (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
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if (ext)
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compute_exts_from_src (ext);
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}
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/* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
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and SHORT_BASE_NAME = `foo'.
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Construct names from it. */
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else
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{
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if (spec_file_prefix)
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{
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/* If --file-prefix=foo was specified, SHORT_BASE_NAME =
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`foo'. */
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short_base_name = xstrdup (spec_file_prefix);
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}
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else if (yacc_flag)
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{
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/* If --yacc, then the output is `y.tab.c'. */
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short_base_name = xstrdup ("y");
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}
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else
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{
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/* Otherwise, the short base name is computed from the input
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grammar: `foo/bar.yy' => `bar'. */
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filename_split (grammar_file, &base, &tab, &ext);
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short_base_name =
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xstrndup (base,
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(strlen (base) - (ext ? strlen (ext) : 0)));
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}
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full_base_name = xmalloc (strlen (short_base_name)
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+ strlen (TAB_EXT) + 1);
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stpcpy (stpcpy (full_base_name, short_base_name), TAB_EXT);
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/* Compute the extensions from the grammar file name. */
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filename_split (grammar_file, &base, &tab, &ext);
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if (ext && !yacc_flag)
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compute_exts_from_gf (ext);
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}
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}
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/* Compute the output file names. Warn if we detect conflicting
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outputs to the same file. */
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void
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compute_output_file_names (void)
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{
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char const *name[4];
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int i;
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int j;
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int names = 0;
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compute_base_names ();
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/* If not yet done. */
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if (!src_extension)
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src_extension = ".c";
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if (!header_extension)
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header_extension = ".h";
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name[names++] = parser_file_name =
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spec_outfile ? spec_outfile : concat2 (full_base_name, src_extension);
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if (defines_flag)
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{
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if (! spec_defines_file)
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spec_defines_file = concat2 (full_base_name, header_extension);
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name[names++] = spec_defines_file;
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}
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if (graph_flag)
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{
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if (! spec_graph_file)
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spec_graph_file = concat2 (short_base_name, ".vcg");
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name[names++] = spec_graph_file;
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}
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if (report_flag)
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{
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spec_verbose_file = concat2 (short_base_name, OUTPUT_EXT);
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name[names++] = spec_verbose_file;
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}
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for (j = 0; j < names; j++)
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for (i = 0; i < j; i++)
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if (strcmp (name[i], name[j]) == 0)
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warn (_("conflicting outputs to file %s"), quote (name[i]));
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}
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