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/*
* This file is part of ltrace.
* Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef VECT_H
#define VECT_H
#include <stddef.h>
#include <assert.h>
#include "callback.h"
/* Vector is an array that can grow as needed to accommodate the data
* that it needs to hold. ELT_SIZE is also used as an elementary
* sanity check, because the array itself is not typed. */
struct vect
{
void *data;
size_t size; /* In elements. */
size_t allocated; /* In elements. */
size_t elt_size; /* In bytes. */
};
/* Initialize VEC, which will hold elements of size ELT_SIZE. */
void vect_init(struct vect *vec, size_t elt_size);
/* Initialize VECP, which will hold elements of type ELT_TYPE. */
#define VECT_INIT(VECP, ELT_TYPE) \
(vect_init(VECP, sizeof(ELT_TYPE)))
/* Initialize TARGET by copying over contents of vector SOURCE. If
* CLONE is non-NULL, it's evoked on each element, and should clone
* SRC into TGT. It should return 0 on success or negative value on
* failure. DATA is passed to CLONE verbatim. This function returns
* 0 on success or negative value on failure. In case of failure, if
* DTOR is non-NULL, it is invoked on all hitherto created elements
* with the same DATA. If one of CLONE, DTOR is non-NULL, then both
* have to be. */
int vect_clone(struct vect *target, const struct vect *source,
int (*clone)(void *tgt, const void *src, void *data),
void (*dtor)(void *elt, void *data),
void *data);
/* Destroy VEC, which holds elements of type ELT_TYPE, using DTOR. */
#define VECT_CLONE(TGT_VEC, SRC_VEC, ELT_TYPE, CLONE, DTOR, DATA) \
/* xxx GCC-ism necessary to get in the safety latches. */ \
({ \
const struct vect *_source_vec = (SRC_VEC); \
assert(_source_vec->elt_size == sizeof(ELT_TYPE)); \
/* Check that callbacks are typed properly. */ \
void (*_dtor_callback)(ELT_TYPE *, void *) = DTOR; \
int (*_clone_callback)(ELT_TYPE *, const ELT_TYPE *, \
void *) = CLONE; \
vect_clone((TGT_VEC), _source_vec, \
(int (*)(void *, const void *, \
void *))_clone_callback, \
(void (*)(void *, void *))_dtor_callback, \
DATA); \
})
/* Return number of elements in VEC. */
size_t vect_size(const struct vect *vec);
/* Emptiness predicate. */
int vect_empty(const struct vect *vec);
/* Accessor. Fetch ELT_NUM-th argument of type ELT_TYPE from the
* vector referenced by VECP. */
#define VECT_ELEMENT(VECP, ELT_TYPE, ELT_NUM) \
(assert((VECP)->elt_size == sizeof(ELT_TYPE)), \
assert((ELT_NUM) < (VECP)->size), \
((ELT_TYPE *)(VECP)->data) + (ELT_NUM))
#define VECT_BACK(VECP, ELT_TYPE) \
VECT_ELEMENT(VECP, ELT_TYPE, (VECP)->size - 1)
/* Copy element referenced by ELTP to the end of VEC. The object
* referenced by ELTP is now owned by VECT. Returns 0 if the
* operation was successful, or negative value on error. */
int vect_pushback(struct vect *vec, void *eltp);
/* Drop last element of VECP. */
void vect_popback(struct vect *vec);
/* Copy element referenced by ELTP to the end of VEC. See
* vect_pushback for details. In addition, make a check whether VECP
* holds elements of the right size. */
#define VECT_PUSHBACK(VECP, ELTP) \
(assert((VECP)->elt_size == sizeof(*(ELTP))), \
vect_pushback((VECP), (ELTP)))
/* Make sure that VEC can hold at least COUNT elements. Return 0 on
* success, negative value on failure. */
int vect_reserve(struct vect *vec, size_t count);
/* Make sure that VEC can accommodate COUNT additional elements. */
int vect_reserve_additional(struct vect *vec, size_t count);
/* Destroy VEC. If DTOR is non-NULL, then it's called on each element
* of the vector. DATA is passed to DTOR verbatim. The memory
* pointed-to by VEC is not freed. */
void vect_destroy(struct vect *vec,
void (*dtor)(void *emt, void *data), void *data);
/* Destroy VEC, which holds elements of type ELT_TYPE, using DTOR. */
#define VECT_DESTROY(VECP, ELT_TYPE, DTOR, DATA) \
do { \
assert((VECP)->elt_size == sizeof(ELT_TYPE)); \
/* Check that DTOR is typed properly. */ \
void (*_dtor_callback)(ELT_TYPE *, void *) = DTOR; \
vect_destroy((VECP), (void (*)(void *, void *))_dtor_callback, \
DATA); \
} while (0)
/* Iterate through vector VEC. See callback.h for notes on iteration
* interfaces. */
void *vect_each(struct vect *vec, void *start_after,
enum callback_status (*cb)(void *, void *), void *data);
#define VECT_EACH(VECP, ELT_TYPE, START_AFTER, CB, DATA) \
/* xxx GCC-ism necessary to get in the safety latches. */ \
({ \
assert((VECP)->elt_size == sizeof(ELT_TYPE)); \
/* Check that CB is typed properly. */ \
enum callback_status (*_cb)(ELT_TYPE *, void *) = CB; \
ELT_TYPE *start_after = (START_AFTER); \
(ELT_TYPE *)vect_each((VECP), start_after, \
(enum callback_status \
(*)(void *, void *))_cb, \
DATA); \
})
#endif /* VECT_H */
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