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gnuplot-old/src/dynarray.c at branch-4-2-stable · gnuplot/gnuplot-old · GitHub
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dynarray.c
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#ifndef
lint
static
char
*
RCSid
() {
return
RCSid
(
"$Id: dynarray.c,v 1.11 2004/07/01 17:10:04 broeker Exp $"
); }
#endif
/*[
* Copyright 1999, 2004 Hans-Bernhard Broeker
*
* Permission to use, copy, and distribute this software and its
* documentation for any purpose with or without fee is hereby granted,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation.
*
* Permission to modify the software is granted, but not the right to
* distribute the complete modified source code. Modifications are to
* be distributed as patches to the released version. Permission to
* distribute binaries produced by compiling modified sources is granted,
* provided you
* 1. distribute the corresponding source modifications from the
* released version in the form of a patch file along with the binaries,
* 2. add special version identification to distinguish your version
* in addition to the base release version number,
* 3. provide your name and address as the primary contact for the
* support of your modified version, and
* 4. retain our contact information in regard to use of the base
* software.
* Permission to distribute the released version of the source code along
* with corresponding source modifications in the form of a patch file is
* granted with same provisions 2 through 4 for binary distributions.
*
* This software is provided "as is" without express or implied warranty
* to the extent permitted by applicable law.
]*/
/* This module implements a dynamically growing array of arbitrary
* elements parametrized by their sizeof(). There is no 'access
* function', i.e. you'll have to access the elements of the
* dynarray->v memory block by hand. It's implemented in OO-style,
* even though this is C, not C++. In particular, every function
* takes a pointer to a data structure type 'dynarray', which mimics
* the 'this' pointer of an object. */
#include
"dynarray.h"
#include
"alloc.h"
#include
"util.h"
/* for graph_error() */
/* The 'constructor' of a dynarray object: initializes all the
* variables to well-defined startup values */
void
init_dynarray
(
dynarray
*
this
,
size_t
entry_size
,
long
size
,
long
increment
)
{
this
->
v
=
0
;
/* preset value, in case gp_alloc fails */
if
(
size
)
this
->
v
=
gp_alloc
(
entry_size
*
size
,
"init dynarray"
);
this
->
size
=
size
;
this
->
end
=
0
;
this
->
increment
=
increment
;
this
->
entry_size
=
entry_size
;
}
/* The 'destructor'; sets all crucial elements of the structure to
* well-defined values to avoid problems by use of bad pointers... */
void
free_dynarray
(
dynarray
*
this
)
{
free
(
this
->
v
);
/* should work, even if gp_alloc failed */
this
->
v
=
0
;
this
->
end
=
this
->
size
=
0
;
}
/* Set the size of the dynamical array to a new, fixed value */
void
resize_dynarray
(
dynarray
*
this
,
long
newsize
)
{
if
(!
this
->
v
)
graph_error
(
"resize_dynarray: dynarray wasn't initialized!"
);
if
(
newsize
==
0
)
free_dynarray
(
this
);
else
{
this
->
v
=
gp_realloc
(
this
->
v
,
this
->
entry_size
*
newsize
,
"extend dynarray"
);
this
->
size
=
newsize
;
}
}
/* Increase the size of the dynarray by a given amount */
void
extend_dynarray
(
dynarray
*
this
,
long
increment
)
{
resize_dynarray
(
this
,
this
->
size
+
increment
);
}
/* Get pointer to the element one past the current end of the dynamic
* array. Resize it if necessary. Returns a pointer-to-void to that
* element. */
void
GPHUGE
*
nextfrom_dynarray
(
dynarray
*
this
)
{
if
(!
this
->
v
)
graph_error
(
"nextfrom_dynarray: dynarray wan't initialized!"
);
if
(
this
->
end
>=
this
->
size
)
extend_dynarray
(
this
,
this
->
increment
);
return
(
void
*
)((
char
*
)(
this
->
v
)
+
this
->
entry_size
*
(
this
->
end
++
));
}
/* Release the element at the current end of the dynamic array, by
* moving the 'end' index one element backwards */
void
droplast_dynarray
(
dynarray
*
this
)
{
if
(!
this
->
v
)
graph_error
(
"droplast_dynarray: dynarray wasn't initialized!"
);
if
(
this
->
end
)
this
->
end
--
;
}
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