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source.c
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/* List lines of source files for GDB, the GNU debugger.
Copyright (C) 1986-2015 Free Software Foundation, Inc.
This file is part of GDB.
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 of the License, 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. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "arch-utils.h"
#include "symtab.h"
#include "expression.h"
#include "language.h"
#include "command.h"
#include "source.h"
#include "gdbcmd.h"
#include "frame.h"
#include "value.h"
#include "filestuff.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "gdbcore.h"
#include "gdb_regex.h"
#include "symfile.h"
#include "objfiles.h"
#include "annotate.h"
#include "gdbtypes.h"
#include "linespec.h"
#include "filenames.h" /* for DOSish file names */
#include "completer.h"
#include "ui-out.h"
#include "readline/readline.h"
#define OPEN_MODE (O_RDONLY | O_BINARY)
#define FDOPEN_MODE FOPEN_RB
/* Prototypes for exported functions. */
void _initialize_source (void);
/* Prototypes for local functions. */
static int get_filename_and_charpos (struct symtab *, char **);
static void reverse_search_command (char *, int);
static void forward_search_command (char *, int);
static void line_info (char *, int);
static void source_info (char *, int);
/* Path of directories to search for source files.
Same format as the PATH environment variable's value. */
char *source_path;
/* Support for source path substitution commands. */
struct substitute_path_rule
{
char *from;
char *to;
struct substitute_path_rule *next;
};
static struct substitute_path_rule *substitute_path_rules = NULL;
/* Symtab of default file for listing lines of. */
static struct symtab *current_source_symtab;
/* Default next line to list. */
static int current_source_line;
static struct program_space *current_source_pspace;
/* Default number of lines to print with commands like "list".
This is based on guessing how many long (i.e. more than chars_per_line
characters) lines there will be. To be completely correct, "list"
and friends should be rewritten to count characters and see where
things are wrapping, but that would be a fair amount of work. */
int lines_to_list = 10;
static void
show_lines_to_list (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file,
_("Number of source lines gdb "
"will list by default is %s.\n"),
value);
}
/* Possible values of 'set filename-display'. */
static const char filename_display_basename[] = "basename";
static const char filename_display_relative[] = "relative";
static const char filename_display_absolute[] = "absolute";
static const char *const filename_display_kind_names[] = {
filename_display_basename,
filename_display_relative,
filename_display_absolute,
NULL
};
static const char *filename_display_string = filename_display_relative;
static void
show_filename_display_string (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Filenames are displayed as \"%s\".\n"), value);
}
/* Line number of last line printed. Default for various commands.
current_source_line is usually, but not always, the same as this. */
static int last_line_listed;
/* First line number listed by last listing command. If 0, then no
source lines have yet been listed since the last time the current
source line was changed. */
static int first_line_listed;
/* Saves the name of the last source file visited and a possible error code.
Used to prevent repeating annoying "No such file or directories" msgs. */
static struct symtab *last_source_visited = NULL;
static int last_source_error = 0;
/* Return the first line listed by print_source_lines.
Used by command interpreters to request listing from
a previous point. */
int
get_first_line_listed (void)
{
return first_line_listed;
}
/* Clear line listed range. This makes the next "list" center the
printed source lines around the current source line. */
static void
clear_lines_listed_range (void)
{
first_line_listed = 0;
last_line_listed = 0;
}
/* Return the default number of lines to print with commands like the
cli "list". The caller of print_source_lines must use this to
calculate the end line and use it in the call to print_source_lines
as it does not automatically use this value. */
int
get_lines_to_list (void)
{
return lines_to_list;
}
/* Return the current source file for listing and next line to list.
NOTE: The returned sal pc and end fields are not valid. */
struct symtab_and_line
get_current_source_symtab_and_line (void)
{
struct symtab_and_line cursal = { 0 };
cursal.pspace = current_source_pspace;
cursal.symtab = current_source_symtab;
cursal.line = current_source_line;
cursal.pc = 0;
cursal.end = 0;
return cursal;
}
/* If the current source file for listing is not set, try and get a default.
Usually called before get_current_source_symtab_and_line() is called.
It may err out if a default cannot be determined.
We must be cautious about where it is called, as it can recurse as the
process of determining a new default may call the caller!
Use get_current_source_symtab_and_line only to get whatever
we have without erroring out or trying to get a default. */
void
set_default_source_symtab_and_line (void)
{
if (!have_full_symbols () && !have_partial_symbols ())
error (_("No symbol table is loaded. Use the \"file\" command."));
/* Pull in a current source symtab if necessary. */
if (current_source_symtab == 0)
select_source_symtab (0);
}
/* Return the current default file for listing and next line to list
(the returned sal pc and end fields are not valid.)
and set the current default to whatever is in SAL.
NOTE: The returned sal pc and end fields are not valid. */
struct symtab_and_line
set_current_source_symtab_and_line (const struct symtab_and_line *sal)
{
struct symtab_and_line cursal = { 0 };
cursal.pspace = current_source_pspace;
cursal.symtab = current_source_symtab;
cursal.line = current_source_line;
cursal.pc = 0;
cursal.end = 0;
current_source_pspace = sal->pspace;
current_source_symtab = sal->symtab;
current_source_line = sal->line;
/* Force the next "list" to center around the current line. */
clear_lines_listed_range ();
return cursal;
}
/* Reset any information stored about a default file and line to print. */
void
clear_current_source_symtab_and_line (void)
{
current_source_symtab = 0;
current_source_line = 0;
}
/* Set the source file default for the "list" command to be S.
If S is NULL, and we don't have a default, find one. This
should only be called when the user actually tries to use the
default, since we produce an error if we can't find a reasonable
default. Also, since this can cause symbols to be read, doing it
before we need to would make things slower than necessary. */
void
select_source_symtab (struct symtab *s)
{
struct symtabs_and_lines sals;
struct symtab_and_line sal;
struct objfile *ofp;
struct compunit_symtab *cu;
if (s)
{
current_source_symtab = s;
current_source_line = 1;
current_source_pspace = SYMTAB_PSPACE (s);
return;
}
if (current_source_symtab)
return;
/* Make the default place to list be the function `main'
if one exists. */
if (lookup_symbol (main_name (), 0, VAR_DOMAIN, 0).symbol)
{
sals = decode_line_with_current_source (main_name (),
DECODE_LINE_FUNFIRSTLINE);
sal = sals.sals[0];
xfree (sals.sals);
current_source_pspace = sal.pspace;
current_source_symtab = sal.symtab;
current_source_line = max (sal.line - (lines_to_list - 1), 1);
if (current_source_symtab)
return;
}
/* Alright; find the last file in the symtab list (ignoring .h's
and namespace symtabs). */
current_source_line = 1;
ALL_FILETABS (ofp, cu, s)
{
const char *name = s->filename;
int len = strlen (name);
if (!(len > 2 && (strcmp (&name[len - 2], ".h") == 0
|| strcmp (name, "<<C++-namespaces>>") == 0)))
{
current_source_pspace = current_program_space;
current_source_symtab = s;
}
}
if (current_source_symtab)
return;
ALL_OBJFILES (ofp)
{
if (ofp->sf)
s = ofp->sf->qf->find_last_source_symtab (ofp);
if (s)
current_source_symtab = s;
}
if (current_source_symtab)
return;
error (_("Can't find a default source file"));
}
/* Handler for "set directories path-list" command.
"set dir mumble" doesn't prepend paths, it resets the entire
path list. The theory is that set(show(dir)) should be a no-op. */
static void
set_directories_command (char *args, int from_tty, struct cmd_list_element *c)
{
/* This is the value that was set.
It needs to be processed to maintain $cdir:$cwd and remove dups. */
char *set_path = source_path;
/* We preserve the invariant that $cdir:$cwd begins life at the end of
the list by calling init_source_path. If they appear earlier in
SET_PATH then mod_path will move them appropriately.
mod_path will also remove duplicates. */
init_source_path ();
if (*set_path != '\0')
mod_path (set_path, &source_path);
xfree (set_path);
}
/* Print the list of source directories.
This is used by the "ld" command, so it has the signature of a command
function. */
static void
show_directories_1 (char *ignore, int from_tty)
{
puts_filtered ("Source directories searched: ");
puts_filtered (source_path);
puts_filtered ("\n");
}
/* Handler for "show directories" command. */
static void
show_directories_command (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
show_directories_1 (NULL, from_tty);
}
/* Forget line positions and file names for the symtabs in a
particular objfile. */
void
forget_cached_source_info_for_objfile (struct objfile *objfile)
{
struct compunit_symtab *cu;
struct symtab *s;
ALL_OBJFILE_FILETABS (objfile, cu, s)
{
if (s->line_charpos != NULL)
{
xfree (s->line_charpos);
s->line_charpos = NULL;
}
if (s->fullname != NULL)
{
xfree (s->fullname);
s->fullname = NULL;
}
}
if (objfile->sf)
objfile->sf->qf->forget_cached_source_info (objfile);
}
/* Forget what we learned about line positions in source files, and
which directories contain them; must check again now since files
may be found in a different directory now. */
void
forget_cached_source_info (void)
{
struct program_space *pspace;
struct objfile *objfile;
ALL_PSPACES (pspace)
ALL_PSPACE_OBJFILES (pspace, objfile)
{
forget_cached_source_info_for_objfile (objfile);
}
last_source_visited = NULL;
}
void
init_source_path (void)
{
char buf[20];
xsnprintf (buf, sizeof (buf), "$cdir%c$cwd", DIRNAME_SEPARATOR);
source_path = xstrdup (buf);
forget_cached_source_info ();
}
/* Add zero or more directories to the front of the source path. */
static void
directory_command (char *dirname, int from_tty)
{
dont_repeat ();
/* FIXME, this goes to "delete dir"... */
if (dirname == 0)
{
if (!from_tty || query (_("Reinitialize source path to empty? ")))
{
xfree (source_path);
init_source_path ();
}
}
else
{
mod_path (dirname, &source_path);
forget_cached_source_info ();
}
if (from_tty)
show_directories_1 ((char *) 0, from_tty);
}
/* Add a path given with the -d command line switch.
This will not be quoted so we must not treat spaces as separators. */
void
directory_switch (char *dirname, int from_tty)
{
add_path (dirname, &source_path, 0);
}
/* Add zero or more directories to the front of an arbitrary path. */
void
mod_path (char *dirname, char **which_path)
{
add_path (dirname, which_path, 1);
}
/* Workhorse of mod_path. Takes an extra argument to determine
if dirname should be parsed for separators that indicate multiple
directories. This allows for interfaces that pre-parse the dirname
and allow specification of traditional separator characters such
as space or tab. */
void
add_path (char *dirname, char **which_path, int parse_separators)
{
char *old = *which_path;
int prefix = 0;
VEC (char_ptr) *dir_vec = NULL;
struct cleanup *back_to;
int ix;
char *name;
if (dirname == 0)
return;
if (parse_separators)
{
char **argv, **argvp;
/* This will properly parse the space and tab separators
and any quotes that may exist. */
argv = gdb_buildargv (dirname);
for (argvp = argv; *argvp; argvp++)
dirnames_to_char_ptr_vec_append (&dir_vec, *argvp);
freeargv (argv);
}
else
VEC_safe_push (char_ptr, dir_vec, xstrdup (dirname));
back_to = make_cleanup_free_char_ptr_vec (dir_vec);
for (ix = 0; VEC_iterate (char_ptr, dir_vec, ix, name); ++ix)
{
char *p;
struct stat st;
/* Spaces and tabs will have been removed by buildargv().
NAME is the start of the directory.
P is the '\0' following the end. */
p = name + strlen (name);
while (!(IS_DIR_SEPARATOR (*name) && p <= name + 1) /* "/" */
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
/* On MS-DOS and MS-Windows, h:\ is different from h: */
&& !(p == name + 3 && name[1] == ':') /* "d:/" */
#endif
&& IS_DIR_SEPARATOR (p[-1]))
/* Sigh. "foo/" => "foo" */
--p;
*p = '\0';
while (p > name && p[-1] == '.')
{
if (p - name == 1)
{
/* "." => getwd (). */
name = current_directory;
goto append;
}
else if (p > name + 1 && IS_DIR_SEPARATOR (p[-2]))
{
if (p - name == 2)
{
/* "/." => "/". */
*--p = '\0';
goto append;
}
else
{
/* "...foo/." => "...foo". */
p -= 2;
*p = '\0';
continue;
}
}
else
break;
}
if (name[0] == '~')
name = tilde_expand (name);
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
else if (IS_ABSOLUTE_PATH (name) && p == name + 2) /* "d:" => "d:." */
name = concat (name, ".", (char *)NULL);
#endif
else if (!IS_ABSOLUTE_PATH (name) && name[0] != '$')
name = concat (current_directory, SLASH_STRING, name, (char *)NULL);
else
name = savestring (name, p - name);
make_cleanup (xfree, name);
/* Unless it's a variable, check existence. */
if (name[0] != '$')
{
/* These are warnings, not errors, since we don't want a
non-existent directory in a .gdbinit file to stop processing
of the .gdbinit file.
Whether they get added to the path is more debatable. Current
answer is yes, in case the user wants to go make the directory
or whatever. If the directory continues to not exist/not be
a directory/etc, then having them in the path should be
harmless. */
if (stat (name, &st) < 0)
{
int save_errno = errno;
fprintf_unfiltered (gdb_stderr, "Warning: ");
print_sys_errmsg (name, save_errno);
}
else if ((st.st_mode & S_IFMT) != S_IFDIR)
warning (_("%s is not a directory."), name);
}
append:
{
unsigned int len = strlen (name);
char tinybuf[2];
p = *which_path;
while (1)
{
/* FIXME: we should use realpath() or its work-alike
before comparing. Then all the code above which
removes excess slashes and dots could simply go away. */
if (!filename_ncmp (p, name, len)
&& (p[len] == '\0' || p[len] == DIRNAME_SEPARATOR))
{
/* Found it in the search path, remove old copy. */
if (p > *which_path)
{
/* Back over leading separator. */
p--;
}
if (prefix > p - *which_path)
{
/* Same dir twice in one cmd. */
goto skip_dup;
}
/* Copy from next '\0' or ':'. */
memmove (p, &p[len + 1], strlen (&p[len + 1]) + 1);
}
p = strchr (p, DIRNAME_SEPARATOR);
if (p != 0)
++p;
else
break;
}
tinybuf[0] = DIRNAME_SEPARATOR;
tinybuf[1] = '\0';
/* If we have already tacked on a name(s) in this command,
be sure they stay on the front as we tack on some
more. */
if (prefix)
{
char *temp, c;
c = old[prefix];
old[prefix] = '\0';
temp = concat (old, tinybuf, name, (char *)NULL);
old[prefix] = c;
*which_path = concat (temp, "", &old[prefix], (char *) NULL);
prefix = strlen (temp);
xfree (temp);
}
else
{
*which_path = concat (name, (old[0] ? tinybuf : old),
old, (char *)NULL);
prefix = strlen (name);
}
xfree (old);
old = *which_path;
}
skip_dup:
;
}
do_cleanups (back_to);
}
static void
source_info (char *ignore, int from_tty)
{
struct symtab *s = current_source_symtab;
struct compunit_symtab *cust;
if (!s)
{
printf_filtered (_("No current source file.\n"));
return;
}
cust = SYMTAB_COMPUNIT (s);
printf_filtered (_("Current source file is %s\n"), s->filename);
if (SYMTAB_DIRNAME (s) != NULL)
printf_filtered (_("Compilation directory is %s\n"), SYMTAB_DIRNAME (s));
if (s->fullname)
printf_filtered (_("Located in %s\n"), s->fullname);
if (s->nlines)
printf_filtered (_("Contains %d line%s.\n"), s->nlines,
s->nlines == 1 ? "" : "s");
printf_filtered (_("Source language is %s.\n"), language_str (s->language));
printf_filtered (_("Producer is %s.\n"),
COMPUNIT_PRODUCER (cust) != NULL
? COMPUNIT_PRODUCER (cust) : _("unknown"));
printf_filtered (_("Compiled with %s debugging format.\n"),
COMPUNIT_DEBUGFORMAT (cust));
printf_filtered (_("%s preprocessor macro info.\n"),
COMPUNIT_MACRO_TABLE (cust) != NULL
? "Includes" : "Does not include");
}
/* Return True if the file NAME exists and is a regular file. */
static int
is_regular_file (const char *name)
{
struct stat st;
const int status = stat (name, &st);
/* Stat should never fail except when the file does not exist.
If stat fails, analyze the source of error and return True
unless the file does not exist, to avoid returning false results
on obscure systems where stat does not work as expected. */
if (status != 0)
return (errno != ENOENT);
return S_ISREG (st.st_mode);
}
/* Open a file named STRING, searching path PATH (dir names sep by some char)
using mode MODE in the calls to open. You cannot use this function to
create files (O_CREAT).
OPTS specifies the function behaviour in specific cases.
If OPF_TRY_CWD_FIRST, try to open ./STRING before searching PATH.
(ie pretend the first element of PATH is "."). This also indicates
that, unless OPF_SEARCH_IN_PATH is also specified, a slash in STRING
disables searching of the path (this is so that "exec-file ./foo" or
"symbol-file ./foo" insures that you get that particular version of
foo or an error message).
If OPTS has OPF_SEARCH_IN_PATH set, absolute names will also be
searched in path (we usually want this for source files but not for
executables).
If FILENAME_OPENED is non-null, set it to a newly allocated string naming
the actual file opened (this string will always start with a "/"). We
have to take special pains to avoid doubling the "/" between the directory
and the file, sigh! Emacs gets confuzzed by this when we print the
source file name!!!
If OPTS has OPF_RETURN_REALPATH set return FILENAME_OPENED resolved by
gdb_realpath. Even without OPF_RETURN_REALPATH this function still returns
filename starting with "/". If FILENAME_OPENED is NULL this option has no
effect.
If a file is found, return the descriptor.
Otherwise, return -1, with errno set for the last name we tried to open. */
/* >>>> This should only allow files of certain types,
>>>> eg executable, non-directory. */
int
openp (const char *path, int opts, const char *string,
int mode, char **filename_opened)
{
int fd;
char *filename;
int alloclen;
VEC (char_ptr) *dir_vec;
struct cleanup *back_to;
int ix;
char *dir;
/* The open syscall MODE parameter is not specified. */
gdb_assert ((mode & O_CREAT) == 0);
gdb_assert (string != NULL);
/* A file with an empty name cannot possibly exist. Report a failure
without further checking.
This is an optimization which also defends us against buggy
implementations of the "stat" function. For instance, we have
noticed that a MinGW debugger built on Windows XP 32bits crashes
when the debugger is started with an empty argument. */
if (string[0] == '\0')
{
errno = ENOENT;
return -1;
}
if (!path)
path = ".";
mode |= O_BINARY;
if ((opts & OPF_TRY_CWD_FIRST) || IS_ABSOLUTE_PATH (string))
{
int i;
if (is_regular_file (string))
{
filename = alloca (strlen (string) + 1);
strcpy (filename, string);
fd = gdb_open_cloexec (filename, mode, 0);
if (fd >= 0)
goto done;
}
else
{
filename = NULL;
fd = -1;
}
if (!(opts & OPF_SEARCH_IN_PATH))
for (i = 0; string[i]; i++)
if (IS_DIR_SEPARATOR (string[i]))
goto done;
}
/* For dos paths, d:/foo -> /foo, and d:foo -> foo. */
if (HAS_DRIVE_SPEC (string))
string = STRIP_DRIVE_SPEC (string);
/* /foo => foo, to avoid multiple slashes that Emacs doesn't like. */
while (IS_DIR_SEPARATOR(string[0]))
string++;
/* ./foo => foo */
while (string[0] == '.' && IS_DIR_SEPARATOR (string[1]))
string += 2;
alloclen = strlen (path) + strlen (string) + 2;
filename = alloca (alloclen);
fd = -1;
dir_vec = dirnames_to_char_ptr_vec (path);
back_to = make_cleanup_free_char_ptr_vec (dir_vec);
for (ix = 0; VEC_iterate (char_ptr, dir_vec, ix, dir); ++ix)
{
size_t len = strlen (dir);
if (strcmp (dir, "$cwd") == 0)
{
/* Name is $cwd -- insert current directory name instead. */
int newlen;
/* First, realloc the filename buffer if too short. */
len = strlen (current_directory);
newlen = len + strlen (string) + 2;
if (newlen > alloclen)
{
alloclen = newlen;
filename = alloca (alloclen);
}
strcpy (filename, current_directory);
}
else if (strchr(dir, '~'))
{
/* See whether we need to expand the tilde. */
int newlen;
char *tilde_expanded;
tilde_expanded = tilde_expand (dir);
/* First, realloc the filename buffer if too short. */
len = strlen (tilde_expanded);
newlen = len + strlen (string) + 2;
if (newlen > alloclen)
{
alloclen = newlen;
filename = alloca (alloclen);
}
strcpy (filename, tilde_expanded);
xfree (tilde_expanded);
}
else
{
/* Normal file name in path -- just use it. */
strcpy (filename, dir);
/* Don't search $cdir. It's also a magic path like $cwd, but we
don't have enough information to expand it. The user *could*
have an actual directory named '$cdir' but handling that would
be confusing, it would mean different things in different
contexts. If the user really has '$cdir' one can use './$cdir'.
We can get $cdir when loading scripts. When loading source files
$cdir must have already been expanded to the correct value. */
if (strcmp (dir, "$cdir") == 0)
continue;
}
/* Remove trailing slashes. */
while (len > 0 && IS_DIR_SEPARATOR (filename[len - 1]))
filename[--len] = 0;
strcat (filename + len, SLASH_STRING);
strcat (filename, string);
if (is_regular_file (filename))
{
fd = gdb_open_cloexec (filename, mode, 0);
if (fd >= 0)
break;
}
}
do_cleanups (back_to);
done:
if (filename_opened)
{
/* If a file was opened, canonicalize its filename. */
if (fd < 0)
*filename_opened = NULL;
else if ((opts & OPF_RETURN_REALPATH) != 0)
*filename_opened = gdb_realpath (filename);
else
*filename_opened = gdb_abspath (filename);
}
return fd;
}
/* This is essentially a convenience, for clients that want the behaviour
of openp, using source_path, but that really don't want the file to be
opened but want instead just to know what the full pathname is (as
qualified against source_path).
The current working directory is searched first.
If the file was found, this function returns 1, and FULL_PATHNAME is
set to the fully-qualified pathname.
Else, this functions returns 0, and FULL_PATHNAME is set to NULL. */
int
source_full_path_of (const char *filename, char **full_pathname)
{
int fd;
fd = openp (source_path,
OPF_TRY_CWD_FIRST | OPF_SEARCH_IN_PATH | OPF_RETURN_REALPATH,
filename, O_RDONLY, full_pathname);
if (fd < 0)
{
*full_pathname = NULL;
return 0;
}
close (fd);
return 1;
}
/* Return non-zero if RULE matches PATH, that is if the rule can be
applied to PATH. */
static int
substitute_path_rule_matches (const struct substitute_path_rule *rule,
const char *path)
{
const int from_len = strlen (rule->from);
const int path_len = strlen (path);
if (path_len < from_len)
return 0;
/* The substitution rules are anchored at the start of the path,
so the path should start with rule->from. */
if (filename_ncmp (path, rule->from, from_len) != 0)
return 0;
/* Make sure that the region in the path that matches the substitution
rule is immediately followed by a directory separator (or the end of
string character). */
if (path[from_len] != '\0' && !IS_DIR_SEPARATOR (path[from_len]))
return 0;
return 1;
}
/* Find the substitute-path rule that applies to PATH and return it.
Return NULL if no rule applies. */
static struct substitute_path_rule *
get_substitute_path_rule (const char *path)
{
struct substitute_path_rule *rule = substitute_path_rules;
while (rule != NULL && !substitute_path_rule_matches (rule, path))
rule = rule->next;
return rule;
}
/* If the user specified a source path substitution rule that applies
to PATH, then apply it and return the new path. This new path must
be deallocated afterwards.
Return NULL if no substitution rule was specified by the user,
or if no rule applied to the given PATH. */
char *
rewrite_source_path (const char *path)
{
const struct substitute_path_rule *rule = get_substitute_path_rule (path);
char *new_path;
int from_len;
if (rule == NULL)
return NULL;
from_len = strlen (rule->from);
/* Compute the rewritten path and return it. */
new_path =
(char *) xmalloc (strlen (path) + 1 + strlen (rule->to) - from_len);
strcpy (new_path, rule->to);
strcat (new_path, path + from_len);
return new_path;