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/* RAII wrapper for buildargv
Copyright (C) 2021-2023 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/>. */
#ifndef GDBSUPPORT_BUILDARGV_H
#define GDBSUPPORT_BUILDARGV_H
#include "libiberty.h"
/* A wrapper for an array of char* that was allocated in the way that
'buildargv' does, and should be freed with 'freeargv'. */
class gdb_argv
{
public:
/* A constructor that initializes to NULL. */
gdb_argv ()
: m_argv (NULL)
{
}
/* A constructor that calls buildargv on STR. STR may be NULL, in
which case this object is initialized with a NULL array. */
explicit gdb_argv (const char *str)
: m_argv (NULL)
{
reset (str);
}
/* A constructor that takes ownership of an existing array. */
explicit gdb_argv (char **array)
: m_argv (array)
{
}
gdb_argv (const gdb_argv &) = delete;
gdb_argv &operator= (const gdb_argv &) = delete;
gdb_argv &operator= (gdb_argv &&other)
{
freeargv (m_argv);
m_argv = other.m_argv;
other.m_argv = nullptr;
return *this;
}
gdb_argv (gdb_argv &&other)
{
m_argv = other.m_argv;
other.m_argv = nullptr;
}
~gdb_argv ()
{
freeargv (m_argv);
}
/* Call buildargv on STR, storing the result in this object. Any
previous state is freed. STR may be NULL, in which case this
object is reset with a NULL array. If buildargv fails due to
out-of-memory, call malloc_failure. Therefore, the value is
guaranteed to be non-NULL, unless the parameter itself is
NULL. */
void reset (const char *str)
{
char **argv = buildargv (str);
freeargv (m_argv);
m_argv = argv;
}
/* Return the underlying array. */
char **get ()
{
return m_argv;
}
const char * const * get () const
{
return m_argv;
}
/* Return the underlying array, transferring ownership to the
caller. */
ATTRIBUTE_UNUSED_RESULT char **release ()
{
char **result = m_argv;
m_argv = NULL;
return result;
}
/* Return the number of items in the array. */
int count () const
{
return countargv (m_argv);
}
/* Index into the array. */
char *operator[] (int arg)
{
gdb_assert (m_argv != NULL);
return m_argv[arg];
}
/* Return the arguments array as an array view. */
gdb::array_view<char *> as_array_view ()
{
return gdb::array_view<char *> (this->get (), this->count ());
}
gdb::array_view<const char * const> as_array_view () const
{
return gdb::array_view<const char * const> (this->get (), this->count ());
}
/* Append arguments to this array. */
void append (gdb_argv &&other)
{
int size = count ();
int argc = other.count ();
m_argv = XRESIZEVEC (char *, m_argv, (size + argc + 1));
for (int argi = 0; argi < argc; argi++)
{
/* Transfer ownership of the string. */
m_argv[size++] = other.m_argv[argi];
/* Ensure that destruction of OTHER works correctly. */
other.m_argv[argi] = nullptr;
}
m_argv[size] = nullptr;
}
/* Append arguments to this array. */
void append (const gdb_argv &other)
{
int size = count ();
int argc = other.count ();
m_argv = XRESIZEVEC (char *, m_argv, (size + argc + 1));
for (int argi = 0; argi < argc; argi++)
m_argv[size++] = xstrdup (other.m_argv[argi]);
m_argv[size] = nullptr;
}
/* The iterator type. */
typedef char **iterator;
/* Return an iterator pointing to the start of the array. */
iterator begin ()
{
return m_argv;
}
/* Return an iterator pointing to the end of the array. */
iterator end ()
{
return m_argv + count ();
}
bool operator!= (std::nullptr_t)
{
return m_argv != NULL;
}
bool operator== (std::nullptr_t)
{
return m_argv == NULL;
}
private:
/* The wrapped array. */
char **m_argv;
};
#endif /* GDBSUPPORT_BUILDARGV_H */
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