gnuplot/src/external.c at 01ae30ccb8160794f89cf7d924722c3996fefd70 · gnuplot/gnuplot · GitHub

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/* GNUPLOT - external.c */

/*[

* Gnuplot license:

* 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.

* Alternative license:

* As an alternative to distributing code in this file under the gnuplot license,

* you may instead comply with the terms below. In this case, redistribution and

* use in source and binary forms, with or without modification, are permitted

* provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this

* list of conditions and the following disclaimer. Redistributions in binary

* form must reproduce the above copyright notice, this list of conditions and

* the following disclaimer in the documentation and/or other materials provided

* with the distribution.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

* POSSIBILITY OF SUCH DAMAGE.

]*/

#include "external.h"

#ifdef HAVE_EXTERNAL_FUNCTIONS

#include "alloc.h"

#include "command.h" /* for c_token and dummy_func */

#include "util.h" /* for int_warn, int_error */

#include "plot.h" /* for gp_expand_tilde */

#ifdef _WIN32

# include "win/winmain.h"

#endif

#include <string.h>

typedef struct value (*exfn_t)(int, struct value *, void *);

typedef void * (*infn_t)(exfn_t);

typedef void (*fifn_t)(void *);

struct exft_entry {

exfn_t exfn;

fifn_t fifn;

struct udft_entry *args;

void *private;

};

void

f_calle(union argument *x)

{

struct value r = x->exf_arg->exfn (x->exf_arg->args->dummy_num,

x->exf_arg->args->dummy_values,

x->exf_arg->private);

if (r.type == INVALID_VALUE)

r = udv_NaN->udv_value;

push(&r);

}

#ifdef _WIN32

static void *

dll_open_w(const char *f)

{

LPWSTR w = UnicodeText((f), encoding);

void * dl = (void *)LoadLibraryW(w);

free(w);

return dl;

}

#endif

Parse the sring argument for a dll filename and function. Create a

one-item action list that calls a plugin function. Call the _init,

if present. _init may return a pointer to private data that is

handed over to the external function for each call.

struct at_type *

external_at(const char *func_name)

{

char *file = NULL;

char *func;

gp_dll_t dl;

exfn_t exfn;

infn_t infn;

fifn_t fifn;

struct at_type *at = NULL;

if (!isstring(c_token))

int_error(c_token, "expecting external function filename");

/* NB: cannot use try_to_get_string() inside an expression evaluation */

m_quote_capture(&file, c_token, c_token);

if (!file)

int_error(c_token, "expecting external function filename");

gp_expand_tilde(&file);

func = strrchr(file, ':');

if (func) {

func[0] = 0;

func++;

} else {

func = (char *)func_name;

}

/* 1st try: "file" */

dl = DLL_OPEN(file);

if (!dl) {

char *err = DLL_ERROR(dl);

char *s;

#ifdef DLL_PATHSEP

int no_path = !(s=strrchr(file, DLL_PATHSEP[0]));

#else

int no_path = 0;

#endif

#ifdef DLL_EXT

int no_ext = !strrchr(no_path ? file : s, '.');

#else

int no_ext = 0;

#endif

if (no_path || no_ext) {

char *nfile = gp_alloc(strlen(file)+7, "exfn filename");

#ifdef DLL_EXT

if (no_ext) {

strcpy(nfile, file);

strcat(nfile, DLL_EXT);

/* 2nd try: "file.so" */

dl = DLL_OPEN(nfile);

}

#endif

#ifdef DLL_PATHSEP

if (!dl && no_path) {

strcpy(nfile, "." DLL_PATHSEP);

strcat(nfile, file);

/* 3rd try: "./file" */

dl = DLL_OPEN(nfile);

#ifdef DLL_EXT

if (!dl && no_ext) {

strcat(nfile, DLL_EXT);

/* 4th try: "./file.so" */

dl = DLL_OPEN(nfile);

}

#endif

}

#endif

free(nfile);

}

if (!dl) {

if (!err || !*err)

err = "cannot load external function";

int_warn(c_token, err);

goto bailout;

}

exfn = (exfn_t)DLL_SYM(dl, func);

if (!exfn) {

char *err = DLL_ERROR(dl);

if (!err)

err = "external function not found";

int_warn(c_token, err);

goto bailout;

}

infn = (infn_t)DLL_SYM(dl, "gnuplot_init");

fifn = (fifn_t)DLL_SYM(dl, "gnuplot_fini");

if (!(at = gp_alloc(sizeof(struct at_type), "external_at")))

goto bailout;

memset(at, 0, sizeof(*at)); /* reset action table !!! */

at->a_count=1;

at->actions[0].index = CALLE;

at->actions[0].arg.exf_arg = gp_alloc(sizeof (struct exft_entry), "external_at");

if (!at->actions[0].arg.exf_arg) {

free(at);

at = NULL;

goto bailout;

}

at->actions[0].arg.exf_arg->exfn = exfn; /* must be freed later */

at->actions[0].arg.exf_arg->fifn = fifn;

at->actions[0].arg.exf_arg->args = dummy_func;

if (!infn)

at->actions[0].arg.exf_arg->private = 0x0;

else

at->actions[0].arg.exf_arg->private = (*infn)(exfn);

bailout:

c_token++;

free(file);

return at;

}

Called with the at of a UDF about to be redefined. Test if the

function was external, and call its _fini, if any.

void

external_free(struct at_type *at)

{

if (at

&& at->a_count == 1

&& at->actions[0].index == CALLE

&& at->actions[0].arg.exf_arg->fifn)

(*at->actions[0].arg.exf_arg->fifn)(at->actions[0].arg.exf_arg->private);

}

#endif /* HAVE_EXTERNAL_FUNCTIONS */

gnuplot/src/external.c at 01ae30ccb8160794f89cf7d924722c3996fefd70 · gnuplot/gnuplot · GitHub

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