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files.c
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/* Part of CPP library. File handling.
Copyright (C) 1986-2014 Free Software Foundation, Inc.
Written by Per Bothner, 1994.
Based on CCCP program by Paul Rubin, June 1986
Adapted to ANSI C, Richard Stallman, Jan 1987
Split out of cpplib.c, Zack Weinberg, Oct 1998
Reimplemented, Neil Booth, Jul 2003
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "cpplib.h"
#include "internal.h"
#include "mkdeps.h"
#include "obstack.h"
#include "hashtab.h"
#include "md5.h"
#include <dirent.h>
/* Variable length record files on VMS will have a stat size that includes
record control characters that won't be included in the read size. */
#ifdef VMS
# define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */
# define STAT_SIZE_RELIABLE(ST) ((ST).st_fab_rfm != FAB_C_VAR)
#else
# define STAT_SIZE_RELIABLE(ST) true
#endif
#ifdef __DJGPP__
#include <io.h>
/* For DJGPP redirected input is opened in text mode. */
# define set_stdin_to_binary_mode() \
if (! isatty (0)) setmode (0, O_BINARY)
#else
# define set_stdin_to_binary_mode() /* Nothing */
#endif
/* This structure represents a file searched for by CPP, whether it
exists or not. An instance may be pointed to by more than one
file_hash_entry; at present no reference count is kept. */
struct _cpp_file
{
/* Filename as given to #include or command line switch. */
const char *name;
/* The full path used to find the file. */
const char *path;
/* The full path of the pch file. */
const char *pchname;
/* The file's path with the basename stripped. NULL if it hasn't
been calculated yet. */
const char *dir_name;
/* Chain through all files. */
struct _cpp_file *next_file;
/* The contents of NAME after calling read_file(). */
const uchar *buffer;
/* Pointer to the real start of BUFFER. read_file() might increment
BUFFER; when freeing, this this pointer must be used instead. */
const uchar *buffer_start;
/* The macro, if any, preventing re-inclusion. */
const cpp_hashnode *cmacro;
/* The directory in the search path where FILE was found. Used for
#include_next and determining whether a header is a system
header. */
cpp_dir *dir;
/* As filled in by stat(2) for the file. */
struct stat st;
/* File descriptor. Invalid if -1, otherwise open. */
int fd;
/* Zero if this file was successfully opened and stat()-ed,
otherwise errno obtained from failure. */
int err_no;
/* Number of times the file has been stacked for preprocessing. */
unsigned short stack_count;
/* If opened with #import or contains #pragma once. */
bool once_only;
/* If read() failed before. */
bool dont_read;
/* If this file is the main file. */
bool main_file;
/* If BUFFER above contains the true contents of the file. */
bool buffer_valid;
/* If this file is implicitly preincluded. */
bool implicit_preinclude;
};
/* A singly-linked list for all searches for a given file name, with
its head pointed to by a slot in FILE_HASH. The file name is what
appeared between the quotes in a #include directive; it can be
determined implicitly from the hash table location or explicitly
from FILE->name.
FILE is a structure containing details about the file that was
found with that search, or details of how the search failed.
START_DIR is the starting location of the search in the include
chain. The current directories for "" includes are also hashed in
the hash table and therefore unique. Files that are looked up
without using a search path, such as absolute filenames and file
names from the command line share a special starting directory so
they don't cause cache hits with normal include-chain lookups.
If START_DIR is NULL then the entry is for a directory, not a file,
and the directory is in DIR. Since the starting point in a file
lookup chain is never NULL, this means that simple pointer
comparisons against START_DIR can be made to determine cache hits
in file lookups.
If a cache lookup fails because of e.g. an extra "./" in the path,
then nothing will break. It is just less efficient as CPP will
have to do more work re-preprocessing the file, and/or comparing
its contents against earlier once-only files.
*/
struct file_hash_entry
{
struct file_hash_entry *next;
cpp_dir *start_dir;
source_location location;
union
{
_cpp_file *file;
cpp_dir *dir;
} u;
};
/* Number of entries to put in a file_hash_entry pool. */
#define FILE_HASH_POOL_SIZE 127
/* A file hash entry pool. We allocate file_hash_entry object from
one of these. */
struct file_hash_entry_pool
{
/* Number of entries used from this pool. */
unsigned int file_hash_entries_used;
/* Next pool in the chain; used when freeing. */
struct file_hash_entry_pool *next;
/* The memory pool. */
struct file_hash_entry pool[FILE_HASH_POOL_SIZE];
};
static bool open_file (_cpp_file *file);
static bool pch_open_file (cpp_reader *pfile, _cpp_file *file,
bool *invalid_pch);
static bool find_file_in_dir (cpp_reader *pfile, _cpp_file *file,
bool *invalid_pch);
static bool read_file_guts (cpp_reader *pfile, _cpp_file *file);
static bool read_file (cpp_reader *pfile, _cpp_file *file);
static bool should_stack_file (cpp_reader *, _cpp_file *file, bool import);
static struct cpp_dir *search_path_head (cpp_reader *, const char *fname,
int angle_brackets, enum include_type);
static const char *dir_name_of_file (_cpp_file *file);
static void open_file_failed (cpp_reader *pfile, _cpp_file *file, int);
static struct file_hash_entry *search_cache (struct file_hash_entry *head,
const cpp_dir *start_dir);
static _cpp_file *make_cpp_file (cpp_reader *, cpp_dir *, const char *fname);
static void destroy_cpp_file (_cpp_file *);
static cpp_dir *make_cpp_dir (cpp_reader *, const char *dir_name, int sysp);
static void allocate_file_hash_entries (cpp_reader *pfile);
static struct file_hash_entry *new_file_hash_entry (cpp_reader *pfile);
static int report_missing_guard (void **slot, void *b);
static hashval_t file_hash_hash (const void *p);
static int file_hash_eq (const void *p, const void *q);
static char *read_filename_string (int ch, FILE *f);
static void read_name_map (cpp_dir *dir);
static char *remap_filename (cpp_reader *pfile, _cpp_file *file);
static char *append_file_to_dir (const char *fname, cpp_dir *dir);
static bool validate_pch (cpp_reader *, _cpp_file *file, const char *pchname);
static int pchf_save_compare (const void *e1, const void *e2);
static int pchf_compare (const void *d_p, const void *e_p);
static bool check_file_against_entries (cpp_reader *, _cpp_file *, bool);
/* Given a filename in FILE->PATH, with the empty string interpreted
as <stdin>, open it.
On success FILE contains an open file descriptor and stat
information for the file. On failure the file descriptor is -1 and
the appropriate errno is also stored in FILE. Returns TRUE iff
successful.
We used to open files in nonblocking mode, but that caused more
problems than it solved. Do take care not to acquire a controlling
terminal by mistake (this can't happen on sane systems, but
paranoia is a virtue).
Use the three-argument form of open even though we aren't
specifying O_CREAT, to defend against broken system headers.
O_BINARY tells some runtime libraries (notably DJGPP) not to do
newline translation; we can handle DOS line breaks just fine
ourselves. */
static bool
open_file (_cpp_file *file)
{
if (file->path[0] == '\0')
{
file->fd = 0;
set_stdin_to_binary_mode ();
}
else
file->fd = open (file->path, O_RDONLY | O_NOCTTY | O_BINARY, 0666);
if (file->fd != -1)
{
if (fstat (file->fd, &file->st) == 0)
{
if (!S_ISDIR (file->st.st_mode))
{
file->err_no = 0;
return true;
}
/* Ignore a directory and continue the search. The file we're
looking for may be elsewhere in the search path. */
errno = ENOENT;
}
close (file->fd);
file->fd = -1;
}
#if defined(_WIN32) && !defined(__CYGWIN__)
else if (errno == EACCES)
{
/* On most UNIX systems, open succeeds on a directory. Above,
we check if we have opened a directory and if so, set errno
to ENOENT. However, on Windows, opening a directory
fails with EACCES. We want to return ENOENT in that
case too. */
if (stat (file->path, &file->st) == 0
&& S_ISDIR (file->st.st_mode))
errno = ENOENT;
else
/* The call to stat may have reset errno. */
errno = EACCES;
}
#endif
else if (errno == ENOTDIR)
errno = ENOENT;
file->err_no = errno;
return false;
}
/* Temporary PCH intercept of opening a file. Try to find a PCH file
based on FILE->name and FILE->dir, and test those found for
validity using PFILE->cb.valid_pch. Return true iff a valid file is
found. Set *INVALID_PCH if a PCH file is found but wasn't valid. */
static bool
pch_open_file (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch)
{
static const char extension[] = ".gch";
const char *path = file->path;
size_t len, flen;
char *pchname;
struct stat st;
bool valid = false;
/* No PCH on <stdin> or if not requested. */
if (file->name[0] == '\0' || !pfile->cb.valid_pch)
return false;
/* If the file is not included as first include from either the toplevel
file or the command-line it is not a valid use of PCH. */
if (pfile->all_files
&& pfile->all_files->next_file
&& !(pfile->all_files->implicit_preinclude
|| pfile->all_files->next_file->implicit_preinclude))
return false;
flen = strlen (path);
len = flen + sizeof (extension);
pchname = XNEWVEC (char, len);
memcpy (pchname, path, flen);
memcpy (pchname + flen, extension, sizeof (extension));
if (stat (pchname, &st) == 0)
{
DIR *pchdir;
struct dirent *d;
size_t dlen, plen = len;
if (!S_ISDIR (st.st_mode))
valid = validate_pch (pfile, file, pchname);
else if ((pchdir = opendir (pchname)) != NULL)
{
pchname[plen - 1] = '/';
while ((d = readdir (pchdir)) != NULL)
{
dlen = strlen (d->d_name) + 1;
if ((strcmp (d->d_name, ".") == 0)
|| (strcmp (d->d_name, "..") == 0))
continue;
if (dlen + plen > len)
{
len += dlen + 64;
pchname = XRESIZEVEC (char, pchname, len);
}
memcpy (pchname + plen, d->d_name, dlen);
valid = validate_pch (pfile, file, pchname);
if (valid)
break;
}
closedir (pchdir);
}
if (!valid)
*invalid_pch = true;
}
if (valid)
file->pchname = pchname;
else
free (pchname);
return valid;
}
/* Canonicalize the path to FILE. Return the canonical form if it is
shorter, otherwise return NULL. This function does NOT free the
memory pointed by FILE. */
static char *
maybe_shorter_path (const char * file)
{
char * file2 = lrealpath (file);
if (file2 && strlen (file2) < strlen (file))
{
return file2;
}
else
{
free (file2);
return NULL;
}
}
/* Try to open the path FILE->name appended to FILE->dir. This is
where remap and PCH intercept the file lookup process. Return true
if the file was found, whether or not the open was successful.
Set *INVALID_PCH to true if a PCH file is found but wasn't valid. */
static bool
find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch)
{
char *path;
if (CPP_OPTION (pfile, remap) && (path = remap_filename (pfile, file)))
;
else
if (file->dir->construct)
path = file->dir->construct (file->name, file->dir);
else
path = append_file_to_dir (file->name, file->dir);
if (path)
{
hashval_t hv;
char *copy;
void **pp;
/* We try to canonicalize system headers. For DOS based file
* system, we always try to shorten non-system headers, as DOS
* has a tighter constraint on max path length. */
if ((CPP_OPTION (pfile, canonical_system_headers) && file->dir->sysp)
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
|| !file->dir->sysp
#endif
)
{
char * canonical_path = maybe_shorter_path (path);
if (canonical_path)
{
/* The canonical path was newly allocated. Let's free the
non-canonical one. */
free (path);
path = canonical_path;
}
}
hv = htab_hash_string (path);
if (htab_find_with_hash (pfile->nonexistent_file_hash, path, hv) != NULL)
{
file->err_no = ENOENT;
return false;
}
file->path = path;
if (pch_open_file (pfile, file, invalid_pch))
return true;
if (open_file (file))
return true;
if (file->err_no != ENOENT)
{
open_file_failed (pfile, file, 0);
return true;
}
/* We copy the path name onto an obstack partly so that we don't
leak the memory, but mostly so that we don't fragment the
heap. */
copy = (char *) obstack_copy0 (&pfile->nonexistent_file_ob, path,
strlen (path));
free (path);
pp = htab_find_slot_with_hash (pfile->nonexistent_file_hash,
copy, hv, INSERT);
*pp = copy;
file->path = file->name;
}
else
{
file->err_no = ENOENT;
file->path = NULL;
}
return false;
}
/* Return tue iff the missing_header callback found the given HEADER. */
static bool
search_path_exhausted (cpp_reader *pfile, const char *header, _cpp_file *file)
{
missing_header_cb func = pfile->cb.missing_header;
/* When the regular search path doesn't work, try context dependent
headers search paths. */
if (func
&& file->dir == NULL)
{
if ((file->path = func (pfile, header, &file->dir)) != NULL)
{
if (open_file (file))
return true;
free ((void *)file->path);
}
file->path = file->name;
}
return false;
}
bool
_cpp_find_failed (_cpp_file *file)
{
return file->err_no != 0;
}
/* Given a filename FNAME search for such a file in the include path
starting from START_DIR. If FNAME is the empty string it is
interpreted as STDIN if START_DIR is PFILE->no_search_path.
If the file is not found in the file cache fall back to the O/S and
add the result to our cache.
If the file was not found in the filesystem, or there was an error
opening it, then ERR_NO is nonzero and FD is -1. If the file was
found, then ERR_NO is zero and FD could be -1 or an open file
descriptor. FD can be -1 if the file was found in the cache and
had previously been closed. To open it again pass the return value
to open_file().
If IMPLICIT_PREINCLUDE then it is OK for the file to be missing.
If present, it is OK for a precompiled header to be included after
it.
*/
_cpp_file *
_cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir,
bool fake, int angle_brackets, bool implicit_preinclude)
{
struct file_hash_entry *entry;
void **hash_slot;
_cpp_file *file;
bool invalid_pch = false;
bool saw_bracket_include = false;
bool saw_quote_include = false;
struct cpp_dir *found_in_cache = NULL;
/* Ensure we get no confusion between cached files and directories. */
if (start_dir == NULL)
cpp_error (pfile, CPP_DL_ICE, "NULL directory in find_file");
hash_slot
= htab_find_slot_with_hash (pfile->file_hash, fname,
htab_hash_string (fname), INSERT);
/* First check the cache before we resort to memory allocation. */
entry = search_cache ((struct file_hash_entry *) *hash_slot, start_dir);
if (entry)
return entry->u.file;
file = make_cpp_file (pfile, start_dir, fname);
file->implicit_preinclude = implicit_preinclude;
/* Try each path in the include chain. */
for (; !fake ;)
{
if (find_file_in_dir (pfile, file, &invalid_pch))
break;
file->dir = file->dir->next;
if (file->dir == NULL)
{
if (search_path_exhausted (pfile, fname, file))
{
/* Although this file must not go in the cache, because
the file found might depend on things (like the current file)
that aren't represented in the cache, it still has to go in
the list of all files so that #import works. */
file->next_file = pfile->all_files;
pfile->all_files = file;
if (*hash_slot == NULL)
{
/* If *hash_slot is NULL, the above htab_find_slot_with_hash
call just created the slot, but we aren't going to store
there anything, so need to remove the newly created entry.
htab_clear_slot requires that it is non-NULL, so store
there some non-NULL pointer, htab_clear_slot will
overwrite it immediately. */
*hash_slot = file;
htab_clear_slot (pfile->file_hash, hash_slot);
}
return file;
}
if (invalid_pch)
{
cpp_error (pfile, CPP_DL_ERROR,
"one or more PCH files were found, but they were invalid");
if (!cpp_get_options (pfile)->warn_invalid_pch)
cpp_error (pfile, CPP_DL_ERROR,
"use -Winvalid-pch for more information");
}
if (implicit_preinclude)
{
free ((char *) file->name);
free (file);
if (*hash_slot == NULL)
{
/* See comment on the above htab_clear_slot call. */
*hash_slot = file;
htab_clear_slot (pfile->file_hash, hash_slot);
}
return NULL;
}
else
open_file_failed (pfile, file, angle_brackets);
break;
}
/* Only check the cache for the starting location (done above)
and the quote and bracket chain heads because there are no
other possible starting points for searches. */
if (file->dir == pfile->bracket_include)
saw_bracket_include = true;
else if (file->dir == pfile->quote_include)
saw_quote_include = true;
else
continue;
entry = search_cache ((struct file_hash_entry *) *hash_slot, file->dir);
if (entry)
{
found_in_cache = file->dir;
break;
}
}
if (entry)
{
/* Cache for START_DIR too, sharing the _cpp_file structure. */
free ((char *) file->name);
free (file);
file = entry->u.file;
}
else
{
/* This is a new file; put it in the list. */
file->next_file = pfile->all_files;
pfile->all_files = file;
}
/* Store this new result in the hash table. */
entry = new_file_hash_entry (pfile);
entry->next = (struct file_hash_entry *) *hash_slot;
entry->start_dir = start_dir;
entry->location = pfile->line_table->highest_location;
entry->u.file = file;
*hash_slot = (void *) entry;
/* If we passed the quote or bracket chain heads, cache them also.
This speeds up processing if there are lots of -I options. */
if (saw_bracket_include
&& pfile->bracket_include != start_dir
&& found_in_cache != pfile->bracket_include)
{
entry = new_file_hash_entry (pfile);
entry->next = (struct file_hash_entry *) *hash_slot;
entry->start_dir = pfile->bracket_include;
entry->location = pfile->line_table->highest_location;
entry->u.file = file;
*hash_slot = (void *) entry;
}
if (saw_quote_include
&& pfile->quote_include != start_dir
&& found_in_cache != pfile->quote_include)
{
entry = new_file_hash_entry (pfile);
entry->next = (struct file_hash_entry *) *hash_slot;
entry->start_dir = pfile->quote_include;
entry->location = pfile->line_table->highest_location;
entry->u.file = file;
*hash_slot = (void *) entry;
}
return file;
}
/* Read a file into FILE->buffer, returning true on success.
If FILE->fd is something weird, like a block device, we don't want
to read it at all. Don't even try to figure out what something is,
except for plain files and block devices, since there is no
reliable portable way of doing this.
FIXME: Flush file cache and try again if we run out of memory. */
static bool
read_file_guts (cpp_reader *pfile, _cpp_file *file)
{
ssize_t size, total, count;
uchar *buf;
bool regular;
if (S_ISBLK (file->st.st_mode))
{
cpp_error (pfile, CPP_DL_ERROR, "%s is a block device", file->path);
return false;
}
regular = S_ISREG (file->st.st_mode) != 0;
if (regular)
{
/* off_t might have a wider range than ssize_t - in other words,
the max size of a file might be bigger than the address
space. We can't handle a file that large. (Anyone with
a single source file bigger than 2GB needs to rethink
their coding style.) Some systems (e.g. AIX 4.1) define
SSIZE_MAX to be much smaller than the actual range of the
type. Use INTTYPE_MAXIMUM unconditionally to ensure this
does not bite us. */
if (file->st.st_size > INTTYPE_MAXIMUM (ssize_t))
{
cpp_error (pfile, CPP_DL_ERROR, "%s is too large", file->path);
return false;
}
size = file->st.st_size;
}
else
/* 8 kilobytes is a sensible starting size. It ought to be bigger
than the kernel pipe buffer, and it's definitely bigger than
the majority of C source files. */
size = 8 * 1024;
/* The + 16 here is space for the final '\n' and 15 bytes of padding,
used to quiet warnings from valgrind or Address Sanitizer, when the
optimized lexer accesses aligned 16-byte memory chunks, including
the bytes after the malloced, area, and stops lexing on '\n'. */
buf = XNEWVEC (uchar, size + 16);
total = 0;
while ((count = read (file->fd, buf + total, size - total)) > 0)
{
total += count;
if (total == size)
{
if (regular)
break;
size *= 2;
buf = XRESIZEVEC (uchar, buf, size + 16);
}
}
if (count < 0)
{
cpp_errno (pfile, CPP_DL_ERROR, file->path);
free (buf);
return false;
}
if (regular && total != size && STAT_SIZE_RELIABLE (file->st))
cpp_error (pfile, CPP_DL_WARNING,
"%s is shorter than expected", file->path);
file->buffer = _cpp_convert_input (pfile,
CPP_OPTION (pfile, input_charset),
buf, size + 16, total,
&file->buffer_start,
&file->st.st_size);
file->buffer_valid = true;
return true;
}
/* Convenience wrapper around read_file_guts that opens the file if
necessary and closes the file descriptor after reading. FILE must
have been passed through find_file() at some stage. */
static bool
read_file (cpp_reader *pfile, _cpp_file *file)
{
/* If we already have its contents in memory, succeed immediately. */
if (file->buffer_valid)
return true;
/* If an earlier read failed for some reason don't try again. */
if (file->dont_read || file->err_no)
return false;
if (file->fd == -1 && !open_file (file))
{
open_file_failed (pfile, file, 0);
return false;
}
file->dont_read = !read_file_guts (pfile, file);
close (file->fd);
file->fd = -1;
return !file->dont_read;
}
/* Returns TRUE if FILE's contents have been successfully placed in
FILE->buffer and the file should be stacked, otherwise false. */
static bool
should_stack_file (cpp_reader *pfile, _cpp_file *file, bool import)
{
_cpp_file *f;
/* Skip once-only files. */
if (file->once_only)
return false;
/* We must mark the file once-only if #import now, before header
guard checks. Otherwise, undefining the header guard might
cause the file to be re-stacked. */
if (import)
{
_cpp_mark_file_once_only (pfile, file);
/* Don't stack files that have been stacked before. */
if (file->stack_count)
return false;
}
/* Skip if the file had a header guard and the macro is defined.
PCH relies on this appearing before the PCH handler below. */
if (file->cmacro && file->cmacro->type == NT_MACRO)
return false;
/* Handle PCH files immediately; don't stack them. */
if (file->pchname)
{
pfile->cb.read_pch (pfile, file->pchname, file->fd, file->path);
file->fd = -1;
free ((void *) file->pchname);
file->pchname = NULL;
return false;
}
if (!read_file (pfile, file))
return false;
/* Check the file against the PCH file. This is done before
checking against files we've already seen, since it may save on
I/O. */
if (check_file_against_entries (pfile, file, import))
{
/* If this isn't a #import, but yet we can't include the file,
that means that it was #import-ed in the PCH file,
so we can never include it again. */
if (! import)
_cpp_mark_file_once_only (pfile, file);
return false;
}
/* Now we've read the file's contents, we can stack it if there
are no once-only files. */
if (!pfile->seen_once_only)
return true;
/* We may have read the file under a different name. Look
for likely candidates and compare file contents to be sure. */
for (f = pfile->all_files; f; f = f->next_file)
{
if (f == file)
continue;
if ((import || f->once_only)
&& f->err_no == 0
&& f->st.st_mtime == file->st.st_mtime
&& f->st.st_size == file->st.st_size)
{
_cpp_file *ref_file;
bool same_file_p = false;
if (f->buffer && !f->buffer_valid)
{
/* We already have a buffer but it is not valid, because
the file is still stacked. Make a new one. */
ref_file = make_cpp_file (pfile, f->dir, f->name);
ref_file->path = f->path;
}
else
/* The file is not stacked anymore. We can reuse it. */
ref_file = f;
same_file_p = read_file (pfile, ref_file)
/* Size might have changed in read_file(). */
&& ref_file->st.st_size == file->st.st_size
&& !memcmp (ref_file->buffer,
file->buffer,
file->st.st_size);
if (f->buffer && !f->buffer_valid)
{
ref_file->path = 0;
destroy_cpp_file (ref_file);
}
if (same_file_p)
break;
}
}
return f == NULL;
}
/* Place the file referenced by FILE into a new buffer on the buffer
stack if possible. IMPORT is true if this stacking attempt is
because of a #import directive. Returns true if a buffer is
stacked. */
bool
_cpp_stack_file (cpp_reader *pfile, _cpp_file *file, bool import)
{
cpp_buffer *buffer;
int sysp;
if (!should_stack_file (pfile, file, import))
return false;
if (pfile->buffer == NULL || file->dir == NULL)
sysp = 0;
else
sysp = MAX (pfile->buffer->sysp, file->dir->sysp);
/* Add the file to the dependencies on its first inclusion. */
if (CPP_OPTION (pfile, deps.style) > !!sysp && !file->stack_count)
{
if (!file->main_file || !CPP_OPTION (pfile, deps.ignore_main_file))
deps_add_dep (pfile->deps, file->path);
}
/* Clear buffer_valid since _cpp_clean_line messes it up. */
file->buffer_valid = false;
file->stack_count++;
/* Stack the buffer. */
buffer = cpp_push_buffer (pfile, file->buffer, file->st.st_size,
CPP_OPTION (pfile, preprocessed)
&& !CPP_OPTION (pfile, directives_only));
buffer->file = file;
buffer->sysp = sysp;
buffer->to_free = file->buffer_start;
/* Initialize controlling macro state. */
pfile->mi_valid = true;
pfile->mi_cmacro = 0;
/* Generate the call back. */
_cpp_do_file_change (pfile, LC_ENTER, file->path, 1, sysp);
return true;
}
/* Mark FILE to be included once only. */
void
_cpp_mark_file_once_only (cpp_reader *pfile, _cpp_file *file)
{
pfile->seen_once_only = true;
file->once_only = true;
}
/* Return the directory from which searching for FNAME should start,
considering the directive TYPE and ANGLE_BRACKETS. If there is
nothing left in the path, returns NULL. */
static struct cpp_dir *
search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets,
enum include_type type)
{
cpp_dir *dir;
_cpp_file *file;
if (IS_ABSOLUTE_PATH (fname))
return &pfile->no_search_path;
/* pfile->buffer is NULL when processing an -include command-line flag. */
file = pfile->buffer == NULL ? pfile->main_file : pfile->buffer->file;
/* For #include_next, skip in the search path past the dir in which
the current file was found, but if it was found via an absolute
path use the normal search logic. */
if (type == IT_INCLUDE_NEXT && file->dir
&& file->dir != &pfile->no_search_path)
dir = file->dir->next;
else if (angle_brackets)
dir = pfile->bracket_include;
else if (type == IT_CMDLINE)
/* -include and -imacros use the #include "" chain with the
preprocessor's cwd prepended. */
return make_cpp_dir (pfile, "./", false);
else if (pfile->quote_ignores_source_dir)
dir = pfile->quote_include;
else
return make_cpp_dir (pfile, dir_name_of_file (file),
pfile->buffer ? pfile->buffer->sysp : 0);
if (dir == NULL)
cpp_error (pfile, CPP_DL_ERROR,
"no include path in which to search for %s", fname);
return dir;
}
/* Strip the basename from the file's path. It ends with a slash if
of nonzero length. Note that this procedure also works for
<stdin>, which is represented by the empty string. */
static const char *
dir_name_of_file (_cpp_file *file)
{
if (!file->dir_name)
{
size_t len = lbasename (file->path) - file->path;
char *dir_name = XNEWVEC (char, len + 1);
memcpy (dir_name, file->path, len);
dir_name[len] = '\0';
file->dir_name = dir_name;
}
return file->dir_name;
}
/* Handles #include-family directives (distinguished by TYPE),
including HEADER, and the command line -imacros and -include.
Returns true if a buffer was stacked. */
bool
_cpp_stack_include (cpp_reader *pfile, const char *fname, int angle_brackets,
enum include_type type)
{
struct cpp_dir *dir;
_cpp_file *file;
bool stacked;
dir = search_path_head (pfile, fname, angle_brackets, type);
if (!dir)
return false;
file = _cpp_find_file (pfile, fname, dir, false, angle_brackets,
type == IT_DEFAULT);
if (type == IT_DEFAULT && file == NULL)