/* GNUPLOT - eval.c */
/*[
* Copyright 1986 - 1993, 1998, 2004 Thomas Williams, Colin Kelley
*
* 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.
]*/
#include "eval.h"
#include "syscfg.h"
#include "alloc.h"
#include "datafile.h"
#include "datablock.h"
#include "external.h" /* for f_calle */
#include "internal.h"
#include "libcerf.h"
#include "specfun.h"
#include "standard.h"
#include "util.h"
#include "version.h"
#include "term_api.h"
#include "voxelgrid.h"
#include
#include
/* Internal prototypes */
static RETSIGTYPE fpe(int an_int);
/* Global variables exported by this module */
struct udvt_entry udv_pi = { NULL, "pi", {INTGR, {0} } };
struct udvt_entry *udv_I;
struct udvt_entry *udv_NaN;
/* first in linked list */
struct udvt_entry *first_udv = &udv_pi;
struct udft_entry *first_udf = NULL;
/* pointer to first udv users can delete */
struct udvt_entry **udv_user_head;
/* Various abnormal conditions during evaluation of an action table
* (the stored form of an expression) are signalled by setting
* undefined = TRUE.
* NB: A test for "if (undefined)" is only valid immediately
* following a call to evaluate_at() or eval_link_function().
*/
TBOOLEAN undefined;
enum int64_overflow overflow_handling = INT64_OVERFLOW_TO_FLOAT;
/* The stack this operates on */
static struct value stack[STACK_DEPTH];
static int s_p = -1; /* stack pointer */
#define top_of_stack stack[s_p]
static int jump_offset; /* to be modified by 'jump' operators */
/* The table of built-in functions */
/* These must strictly parallel enum operators in eval.h */
const struct ft_entry ft[] =
{
/* internal functions: */
{"push", f_push},
{"pushc", f_pushc},
{"pushd1", f_pushd1},
{"pushd2", f_pushd2},
{"pushd", f_pushd},
{"pop", f_pop},
{"call", f_call},
{"calln", f_calln},
{"sum", f_sum},
{"lnot", f_lnot},
{"bnot", f_bnot},
{"uminus", f_uminus},
{"nop", f_nop},
{"lor", f_lor},
{"land", f_land},
{"bor", f_bor},
{"xor", f_xor},
{"band", f_band},
{"eq", f_eq},
{"ne", f_ne},
{"gt", f_gt},
{"lt", f_lt},
{"ge", f_ge},
{"le", f_le},
{"leftshift", f_leftshift},
{"rightshift", f_rightshift},
{"plus", f_plus},
{"minus", f_minus},
{"mult", f_mult},
{"div", f_div},
{"mod", f_mod},
{"power", f_power},
{"factorial", f_factorial},
{"bool", f_bool},
{"dollars", f_dollars}, /* for usespec */
{"concatenate", f_concatenate}, /* for string variables only */
{"eqs", f_eqs}, /* for string variables only */
{"nes", f_nes}, /* for string variables only */
{"[]", f_range}, /* for string variables only */
{"[]", f_index}, /* for array variables only */
{"||", f_cardinality}, /* for array variables only */
{"assign", f_assign}, /* assignment operator '=' */
{"jump", f_jump},
{"jumpz", f_jumpz},
{"jumpnz", f_jumpnz},
{"jtern", f_jtern},
/* Placeholder for SF_START */
{"", NULL},
#ifdef HAVE_EXTERNAL_FUNCTIONS
{"", f_calle},
#endif
/* legal in using spec only */
{"column", f_column},
{"stringcolumn", f_stringcolumn}, /* for using specs */
{"strcol", f_stringcolumn}, /* shorthand form */
{"columnhead", f_columnhead},
{"columnheader", f_columnhead},
{"valid", f_valid},
{"timecolumn", f_timecolumn},
/* standard functions: */
{"real", f_real},
{"imag", f_imag},
{"arg", f_arg},
{"conjg", f_conjg},
{"sin", f_sin},
{"cos", f_cos},
{"tan", f_tan},
{"asin", f_asin},
{"acos", f_acos},
{"atan", f_atan},
{"atan2", f_atan2},
{"sinh", f_sinh},
{"cosh", f_cosh},
{"tanh", f_tanh},
{"EllipticK", f_ellip_first},
{"EllipticE", f_ellip_second},
{"EllipticPi", f_ellip_third},
{"int", f_int},
{"abs", f_abs},
{"sgn", f_sgn},
{"sqrt", f_sqrt},
{"exp", f_exp},
{"log10", f_log10},
{"log", f_log},
{"besi0", f_besi0},
{"besi1", f_besi1},
{"besj0", f_besj0},
{"besj1", f_besj1},
{"besjn", f_besjn},
{"besy0", f_besy0},
{"besy1", f_besy1},
{"besyn", f_besyn},
{"erf", f_erf},
{"erfc", f_erfc},
{"gamma", f_gamma},
{"lgamma", f_lgamma},
{"ibeta", f_ibeta},
{"voigt", f_voigt},
{"igamma", f_igamma},
{"rand", f_rand},
{"floor", f_floor},
{"ceil", f_ceil},
{"norm", f_normal}, /* XXX-JG */
{"inverf", f_inverse_erf}, /* XXX-JG */
{"invnorm", f_inverse_normal}, /* XXX-JG */
{"asinh", f_asinh},
{"acosh", f_acosh},
{"atanh", f_atanh},
{"lambertw", f_lambertw}, /* HBB, from G.Kuhnle 20001107 */
{"airy", f_airy}, /* janert, 20090905 */
{"expint", f_expint}, /* Jim Van Zandt, 20101010 */
{"besin", f_besin},
#ifdef HAVE_LIBCERF
{"cerf", f_cerf}, /* complex error function */
{"cdawson", f_cdawson}, /* complex Dawson's integral */
{"erfi", f_erfi}, /* imaginary error function */
{"VP", f_voigtp}, /* Voigt profile */
{"faddeeva", f_faddeeva}, /* Faddeeva rescaled complex error function "w_of_z" */
#endif
{"tm_sec", f_tmsec}, /* time function */
{"tm_min", f_tmmin}, /* time function */
{"tm_hour", f_tmhour}, /* time function */
{"tm_mday", f_tmmday}, /* time function */
{"tm_mon", f_tmmon}, /* time function */
{"tm_year", f_tmyear}, /* time function */
{"tm_wday", f_tmwday}, /* time function */
{"tm_yday", f_tmyday}, /* time function */
{"tm_week", f_tmweek}, /* time function */
{"weekdate_iso", f_weekdate_iso},
{"weekdate_cdc", f_weekdate_cdc},
{"sprintf", f_sprintf}, /* for string variables only */
{"gprintf", f_gprintf}, /* for string variables only */
{"strlen", f_strlen}, /* for string variables only */
{"strstrt", f_strstrt}, /* for string variables only */
{"substr", f_range}, /* for string variables only */
{"trim", f_trim}, /* for string variables only */
{"word", f_word}, /* for string variables only */
{"words", f_words}, /* implemented as word(s,-1) */
{"strftime", f_strftime}, /* time to string */
{"strptime", f_strptime}, /* string to time */
{"time", f_time}, /* get current time */
{"system", f_system}, /* "dynamic backtics" */
{"exist", f_exists}, /* exists("foo") replaces defined(foo) */
{"exists", f_exists}, /* exists("foo") replaces defined(foo) */
{"value", f_value}, /* retrieve value of variable known by name */
{"hsv2rgb", f_hsv2rgb}, /* color conversion */
{"palette", f_palette}, /* palette color lookup */
#ifdef VOXEL_GRID_SUPPORT
{"voxel", f_voxel}, /* extract value of single voxel */
#endif
{NULL, NULL}
};
/* Module-local variables: */
static JMP_BUF fpe_env;
/* Internal helper functions: */
static RETSIGTYPE
fpe(int an_int)
{
#if defined(MSDOS) && !defined(__EMX__) && !defined(DJGPP)
/* thanks to lotto@wjh12.UUCP for telling us about this */
_fpreset();
#endif
(void) an_int; /* avoid -Wunused warning */
(void) signal(SIGFPE, (sigfunc) fpe);
undefined = TRUE;
LONGJMP(fpe_env, TRUE);
}
/* Exported functions */
/* First, some functions that help other modules use 'struct value' ---
* these might justify a separate module, but I'll stick with this,
* for now */
/* returns the real part of val */
double
real(struct value *val)
{
switch (val->type) {
case INTGR:
return ((double) val->v.int_val);
case CMPLX:
return (val->v.cmplx_val.real);
case STRING: /* FIXME is this ever used? */
return (atof(val->v.string_val));
case NOTDEFINED:
return not_a_number();
default:
int_error(NO_CARET, "unknown type in real()");
}
/* NOTREACHED */
return ((double) 0.0);
}
/* returns the imag part of val */
double
imag(struct value *val)
{
switch (val->type) {
case INTGR:
return (0.0);
case CMPLX:
return (val->v.cmplx_val.imag);
case STRING:
/* This is where we end up if the user tries: */
/* x = 2; plot sprintf(format,x) */
int_warn(NO_CARET, "encountered a string when expecting a number");
int_error(NO_CARET, "Did you try to generate a file name using dummy variable x or y?");
case NOTDEFINED:
return not_a_number();
default:
int_error(NO_CARET, "unknown type in imag()");
}
/* NOTREACHED */
return ((double) 0.0);
}
/* returns the magnitude of val */
double
magnitude(struct value *val)
{
switch (val->type) {
case INTGR:
return (fabs((double)val->v.int_val));
case CMPLX:
{
/* The straightforward implementation sqrt(r*r+i*i)
* over-/underflows if either r or i is very large or very
* small. This implementation avoids over-/underflows from
* squaring large/small numbers whenever possible. It
* only over-/underflows if the correct result would, too.
* CAVEAT: sqrt(1+x*x) can still have accuracy
* problems. */
double abs_r = fabs(val->v.cmplx_val.real);
double abs_i = fabs(val->v.cmplx_val.imag);
double quotient;
if (abs_i == 0)
return abs_r;
if (abs_r > abs_i) {
quotient = abs_i / abs_r;
return abs_r * sqrt(1 + quotient*quotient);
} else {
quotient = abs_r / abs_i;
return abs_i * sqrt(1 + quotient*quotient);
}
}
default:
int_error(NO_CARET, "unknown type in magnitude()");
}
/* NOTREACHED */
return ((double) 0.0);
}
/* returns the angle of val */
double
angle(struct value *val)
{
switch (val->type) {
case INTGR:
return ((val->v.int_val >= 0) ? 0.0 : M_PI);
case CMPLX:
if (val->v.cmplx_val.imag == 0.0) {
if (val->v.cmplx_val.real >= 0.0)
return (0.0);
else
return (M_PI);
}
return (atan2(val->v.cmplx_val.imag,
val->v.cmplx_val.real));
default:
int_error(NO_CARET, "unknown type in angle()");
}
/* NOTREACHED */
return ((double) 0.0);
}
struct value *
Gcomplex(struct value *a, double realpart, double imagpart)
{
a->type = CMPLX;
a->v.cmplx_val.real = realpart;
a->v.cmplx_val.imag = imagpart;
return (a);
}
struct value *
Ginteger(struct value *a, intgr_t i)
{
a->type = INTGR;
a->v.int_val = i;
return (a);
}
struct value *
Gstring(struct value *a, char *s)
{
a->type = STRING;
a->v.string_val = s ? s : strdup("");
return (a);
}
/* Common interface for freeing data structures attached to a struct value.
* Each of the type-specific routines will ignore values of other types.
*/
void
free_value(struct value *a)
{
gpfree_string(a);
/* gpfree_datablock(a); */
gpfree_array(a);
}
/* It is always safe to call gpfree_string with a->type is INTGR or CMPLX.
* However it would be fatal to call it with a->type = STRING if a->string_val
* was not obtained by a previous call to gp_alloc(), or has already been freed.
* Thus 'a->type' is set to NOTDEFINED afterwards to make subsequent calls safe.
*/
void
gpfree_string(struct value *a)
{
if (a->type == STRING) {
free(a->v.string_val);
a->type = NOTDEFINED;
}
}
void
gpfree_array(struct value *a)
{
int i;
int size;
if (a->type == ARRAY) {
size = a->v.value_array[0].v.int_val;
for (i=1; iv.value_array[i]));
free(a->v.value_array);
a->type = NOTDEFINED;
}
}
/* some machines have trouble with exp(-x) for large x
* if E_MINEXP is defined at compile time, use gp_exp(x) instead,
* which returns 0 for exp(x) with x < E_MINEXP
* exp(x) will already have been defined as gp_exp(x) in plot.h
*/
double
gp_exp(double x)
{
#ifdef E_MINEXP
return (x < (E_MINEXP)) ? 0.0 : exp(x);
#else /* E_MINEXP */
int old_errno = errno;
double result = exp(x);
/* exp(-large) quite uselessly raises ERANGE --- stop that */
if (result == 0.0)
errno = old_errno;
return result;
#endif /* E_MINEXP */
}
void
reset_stack()
{
s_p = -1;
}
void
check_stack()
{ /* make sure stack's empty */
if (s_p != -1)
fprintf(stderr, "\n\
warning: internal error--stack not empty!\n\
(function called with too many parameters?)\n");
}
TBOOLEAN
more_on_stack()
{
return (s_p >= 0);
}
struct value *
pop(struct value *x)
{
if (s_p < 0)
int_error(NO_CARET, "stack underflow (function call with missing parameters?)");
*x = stack[s_p--];
return (x);
}
/*
* Allow autoconversion of string variables to floats if they
* are dereferenced in a numeric context.
* Jun 2022: Stricter error checking for non-numeric string.
*/
struct value *
pop_or_convert_from_string(struct value *v)
{
pop(v);
/* FIXME: Test for INVALID_VALUE? Other corner cases? */
if (v->type == INVALID_NAME)
int_error(NO_CARET, "invalid dummy variable name");
if (v->type == STRING) {
char *string = v->v.string_val;
char *eov = string;
char trailing = *eov;
/* If the string contains no decimal point, try to interpret it as an integer.
* We treat a string starting with "0x" as a hexadecimal; everything else
* as decimal. So int("010") promotes to 10, not 8.
*/
if (strcspn(string, ".") == strlen(string)) {
long long li;
if (string[0] == '0' && string[1] == 'x')
li = strtoll( string, &eov, 16 );
else
li = strtoll( string, &eov, 10 );
trailing = *eov;
Ginteger(v, li);
}
/* Successful interpretation as an integer leaves (eov != string).
* Otherwise try again as a floating point, including oddball cases like
* "NaN" or "-Inf" that contain no decimal point.
*/
if (eov == string) {
double d = strtod(string, &eov);
trailing = *eov;
Gcomplex(v, d, 0.);
}
free(string); /* NB: invalidates dereference of eov */
if (eov == string)
int_error(NO_CARET,"Non-numeric string found where a numeric expression was expected");
if (trailing && !isspace(trailing))
int_warn(NO_CARET,"Trailing characters after numeric expression");
}
return(v);
}
void
push(struct value *x)
{
if (s_p == STACK_DEPTH - 1)
int_error(NO_CARET, "stack overflow");
stack[++s_p] = *x;
/* WARNING - This is a memory leak if the string is not later freed */
if (x->type == STRING && x->v.string_val)
stack[s_p].v.string_val = gp_strdup(x->v.string_val);
}
void
int_check(struct value *v)
{
if (v->type != INTGR)
int_error(NO_CARET, "non-integer passed to boolean operator");
}
/* Internal operators of the stack-machine, not directly represented
* by any user-visible operator, or using private status variables
* directly */
/* converts top-of-stack to boolean */
void
f_bool(union argument *x)
{
(void) x; /* avoid -Wunused warning */
int_check(&top_of_stack);
top_of_stack.v.int_val = !!top_of_stack.v.int_val;
}
void
f_jump(union argument *x)
{
(void) x; /* avoid -Wunused warning */
jump_offset = x->j_arg;
}
void
f_jumpz(union argument *x)
{
struct value a;
(void) x; /* avoid -Wunused warning */
int_check(&top_of_stack);
if (top_of_stack.v.int_val) { /* non-zero --> no jump*/
(void) pop(&a);
} else
jump_offset = x->j_arg; /* leave the argument on TOS */
}
void
f_jumpnz(union argument *x)
{
struct value a;
(void) x; /* avoid -Wunused warning */
int_check(&top_of_stack);
if (top_of_stack.v.int_val) /* non-zero */
jump_offset = x->j_arg; /* leave the argument on TOS */
else {
(void) pop(&a);
}
}
void
f_jtern(union argument *x)
{
struct value a;
(void) x; /* avoid -Wunused warning */
int_check(pop(&a));
if (! a.v.int_val)
jump_offset = x->j_arg; /* go jump to FALSE code */
}
/* This is the heart of the expression evaluation module: the stack
program execution loop.
'ft' is a table containing C functions within this program.
An 'action_table' contains pointers to these functions and
arguments to be passed to them.
at_ptr is a pointer to the action table which must be executed
(evaluated).
so the iterated line executes the function indexed by the at_ptr
and passes the address of the argument which is pointed to by the
arg_ptr
*/
void
execute_at(struct at_type *at_ptr)
{
int instruction_index, operator, count;
int saved_jump_offset = jump_offset;
count = at_ptr->a_count;
for (instruction_index = 0; instruction_index < count;) {
operator = (int) at_ptr->actions[instruction_index].index;
jump_offset = 1; /* jump operators can modify this */
(*ft[operator].func) (&(at_ptr->actions[instruction_index].arg));
assert(is_jump(operator) || (jump_offset == 1));
instruction_index += jump_offset;
}
jump_offset = saved_jump_offset;
}
/* As of May 2013 input of Inf/NaN values through evaluation is treated */
/* equivalently to direct input of a formatted value. See imageNaN.dem. */
void
evaluate_at(struct at_type *at_ptr, struct value *val_ptr)
{
/* A test for if (undefined) is allowed only immediately following
* evalute_at() or eval_link_function(). Both must clear it on entry
* so that the value on return reflects what really happened.
*/
undefined = FALSE;
val_ptr->type = NOTDEFINED;
errno = 0;
reset_stack();
if (!evaluate_inside_using || !df_nofpe_trap) {
if (SETJMP(fpe_env, 1))
return;
(void) signal(SIGFPE, (sigfunc) fpe);
}
execute_at(at_ptr);
if (!evaluate_inside_using || !df_nofpe_trap)
(void) signal(SIGFPE, SIG_DFL);
if (errno == EDOM || errno == ERANGE)
undefined = TRUE;
else if (!undefined) {
(void) pop(val_ptr);
check_stack();
}
if (!undefined && val_ptr->type == ARRAY) {
/* Aug 2016: error rather than warning because too many places
* cannot deal with UNDEFINED or NaN where they were expecting a number
* E.g. load_one_range()
*/
val_ptr->type = NOTDEFINED;
if (!string_result_only)
int_error(NO_CARET, "evaluate_at: unsupported array operation");
}
}
void
real_free_at(struct at_type *at_ptr)
{
int i;
/* All string constants belonging to this action table have to be
* freed before destruction. */
if (!at_ptr)
return;
for (i=0; ia_count; i++) {
struct at_entry *a = &(at_ptr->actions[i]);
/* if union a->arg is used as a->arg.v_arg free potential string */
if ( a->index == PUSHC || a->index == DOLLARS )
gpfree_string(&(a->arg.v_arg));
/* a summation contains its own action table wrapped in a private udf */
if (a->index == SUM) {
real_free_at(a->arg.udf_arg->at);
free(a->arg.udf_arg);
}
#ifdef HAVE_EXTERNAL_FUNCTIONS
/* external function calls contain a parameter list */
if (a->index == CALLE)
free(a->arg.exf_arg);
#endif
}
free(at_ptr);
}
/* EAM July 2003 - Return pointer to udv with this name; if the key does not
* match any existing udv names, create a new one and return a pointer to it.
*/
struct udvt_entry *
add_udv_by_name(char *key)
{
struct udvt_entry **udv_ptr = &first_udv;
/* check if it's already in the table... */
while (*udv_ptr) {
if (!strcmp(key, (*udv_ptr)->udv_name))
return (*udv_ptr);
udv_ptr = &((*udv_ptr)->next_udv);
}
*udv_ptr = (struct udvt_entry *)
gp_alloc(sizeof(struct udvt_entry), "value");
(*udv_ptr)->next_udv = NULL;
(*udv_ptr)->udv_name = gp_strdup(key);
(*udv_ptr)->udv_value.type = NOTDEFINED;
return (*udv_ptr);
}
struct udvt_entry *
get_udv_by_name(char *key)
{
struct udvt_entry *udv = first_udv;
while (udv) {
if (!strcmp(key, udv->udv_name))
return udv;
udv = udv->next_udv;
}
return NULL;
}
/* This doesn't really delete, it just marks the udv as undefined */
void
del_udv_by_name(char *key, TBOOLEAN wildcard)
{
struct udvt_entry *udv_ptr = *udv_user_head;
while (udv_ptr) {
/* Forbidden to delete GPVAL_* */
if (!strncmp(udv_ptr->udv_name,"GPVAL",5))
;
else if (!strncmp(udv_ptr->udv_name,"GNUTERM",7))
;
/* exact match */
else if (!wildcard && !strcmp(key, udv_ptr->udv_name)) {
gpfree_vgrid(udv_ptr);
free_value(&(udv_ptr->udv_value));
udv_ptr->udv_value.type = NOTDEFINED;
break;
}
/* wildcard match: prefix matches */
else if ( wildcard && !strncmp(key, udv_ptr->udv_name, strlen(key)) ) {
gpfree_vgrid(udv_ptr);
free_value(&(udv_ptr->udv_value));
udv_ptr->udv_value.type = NOTDEFINED;
/* no break - keep looking! */
}
udv_ptr = udv_ptr->next_udv;
}
}
/* Clear (delete) all user defined functions */
void
clear_udf_list()
{
struct udft_entry *udf_ptr = first_udf;
struct udft_entry *udf_next;
while (udf_ptr) {
free(udf_ptr->udf_name);
free(udf_ptr->definition);
free_at(udf_ptr->at);
udf_next = udf_ptr->next_udf;
free(udf_ptr);
udf_ptr = udf_next;
}
first_udf = NULL;
}
static void update_plot_bounds(void);
static void fill_gpval_axis(AXIS_INDEX axis);
static void fill_gpval_sysinfo(void);
static void set_gpval_axis_sth_double(const char *prefix, AXIS_INDEX axis, const char *suffix, double value);
static void
set_gpval_axis_sth_double(const char *prefix, AXIS_INDEX axis, const char *suffix, double value)
{
struct udvt_entry *v;
char *cc, s[24];
sprintf(s, "%s_%s_%s", prefix, axis_name(axis), suffix);
for (cc=s; *cc; cc++)
*cc = toupper((unsigned char)*cc); /* make the name uppercase */
v = add_udv_by_name(s);
if (!v)
return; /* should not happen */
Gcomplex(&v->udv_value, value, 0);
}
static void
fill_gpval_axis(AXIS_INDEX axis)
{
const char *prefix = "GPVAL";
AXIS *ap = &axis_array[axis];
set_gpval_axis_sth_double(prefix, axis, "MIN", ap->min);
set_gpval_axis_sth_double(prefix, axis, "MAX", ap->max);
set_gpval_axis_sth_double(prefix, axis, "LOG", ap->base);
if (axis < POLAR_AXIS) {
set_gpval_axis_sth_double("GPVAL_DATA", axis, "MIN", ap->data_min);
set_gpval_axis_sth_double("GPVAL_DATA", axis, "MAX", ap->data_max);
}
}
/* Fill variable "var" visible by "show var" or "show var all" ("GPVAL_*")
* by the given value (string, integer, float, complex).
*/
void
fill_gpval_string(char *var, const char *stringvalue)
{
struct udvt_entry *v = add_udv_by_name(var);
if (!v)
return;
if (v->udv_value.type == STRING && !strcmp(v->udv_value.v.string_val, stringvalue))
return;
else
gpfree_string(&v->udv_value);
Gstring(&v->udv_value, gp_strdup(stringvalue));
}
void
fill_gpval_integer(char *var, intgr_t value)
{
struct udvt_entry *v = add_udv_by_name(var);
if (!v)
return;
Ginteger(&v->udv_value, value);
}
void
fill_gpval_float(char *var, double value)
{
struct udvt_entry *v = add_udv_by_name(var);
if (!v)
return;
Gcomplex(&v->udv_value, value, 0);
}
void
fill_gpval_complex(char *var, double areal, double aimag)
{
struct udvt_entry *v = add_udv_by_name(var);
if (!v)
return;
Gcomplex(&v->udv_value, areal, aimag);
}
/*
* Export axis bounds in terminal coordinates from previous plot.
* This allows offline mapping of pixel coordinates onto plot coordinates.
*/
static void
update_plot_bounds(void)
{
fill_gpval_float("GPVAL_TERM_XMIN", (double)axis_array[FIRST_X_AXIS].term_lower / term->tscale);
fill_gpval_float("GPVAL_TERM_XMAX", (double)axis_array[FIRST_X_AXIS].term_upper / term->tscale);
fill_gpval_float("GPVAL_TERM_YMIN", (double)axis_array[FIRST_Y_AXIS].term_lower / term->tscale);
fill_gpval_float("GPVAL_TERM_YMAX", (double)axis_array[FIRST_Y_AXIS].term_upper / term->tscale);
fill_gpval_integer("GPVAL_TERM_XSIZE", canvas.xright+1);
fill_gpval_integer("GPVAL_TERM_YSIZE", canvas.ytop+1);
fill_gpval_integer("GPVAL_TERM_SCALE", term->tscale);
/* May be useful for debugging font problems */
fill_gpval_integer("GPVAL_TERM_HCHAR", term->h_char);
fill_gpval_integer("GPVAL_TERM_VCHAR", term->v_char);
}
/*
* Put all the handling for GPVAL_* variables in this one routine.
* We call it from one of several contexts:
* 0: following a successful set/unset command
* 1: following a successful plot/splot
* 2: following an unsuccessful command (int_error)
* 3: program entry
* 4: explicit reset of error status
* 5: directory changed
* 6: X11 Window ID changed
*/
void
update_gpval_variables(int context)
{
/* These values may change during a plot command due to auto range */
if (context == 1) {
fill_gpval_axis(FIRST_X_AXIS);
fill_gpval_axis(FIRST_Y_AXIS);
fill_gpval_axis(SECOND_X_AXIS);
fill_gpval_axis(SECOND_Y_AXIS);
fill_gpval_axis(FIRST_Z_AXIS);
fill_gpval_axis(COLOR_AXIS);
fill_gpval_axis(T_AXIS);
fill_gpval_axis(U_AXIS);
fill_gpval_axis(V_AXIS);
fill_gpval_float("GPVAL_R_MIN", R_AXIS.min);
fill_gpval_float("GPVAL_R_MAX", R_AXIS.max);
fill_gpval_float("GPVAL_R_LOG", R_AXIS.base);
update_plot_bounds();
fill_gpval_integer("GPVAL_PLOT", is_3d_plot ? 0:1);
fill_gpval_integer("GPVAL_SPLOT", is_3d_plot ? 1:0);
fill_gpval_integer("GPVAL_VIEW_MAP", splot_map ? 1:0);
fill_gpval_float("GPVAL_VIEW_ROT_X", surface_rot_x);
fill_gpval_float("GPVAL_VIEW_ROT_Z", surface_rot_z);
fill_gpval_float("GPVAL_VIEW_SCALE", surface_scale);
fill_gpval_float("GPVAL_VIEW_ZSCALE", surface_zscale);
fill_gpval_float("GPVAL_VIEW_AZIMUTH", azimuth);
/* Screen coordinates of 3D rotational center and radius of the sphere */
/* in which x/y axes are drawn after 'set view equal xy[z]' */
fill_gpval_float("GPVAL_VIEW_XCENT",
(double)(canvas.xright+1 - xmiddle)/(double)(canvas.xright+1));
fill_gpval_float("GPVAL_VIEW_YCENT",
1.0 - (double)(canvas.ytop+1 - ymiddle)/(double)(canvas.ytop+1));
fill_gpval_float("GPVAL_VIEW_RADIUS",
0.5 * surface_scale * xscaler/(double)(canvas.xright+1));
return;
}
/* These are set after every "set" command, which is kind of silly */
/* because they only change after 'set term' 'set output' ... */
if (context == 0 || context == 2 || context == 3) {
/* This prevents a segfault if term==NULL, which can */
/* happen if set_terminal() exits via int_error(). */
if (!term)
fill_gpval_string("GPVAL_TERM", "unknown");
else
fill_gpval_string("GPVAL_TERM", (char *)(term->name));
fill_gpval_string("GPVAL_TERMOPTIONS", term_options);
fill_gpval_string("GPVAL_OUTPUT", (outstr) ? outstr : "");
fill_gpval_string("GPVAL_ENCODING", encoding_names[encoding]);
fill_gpval_string("GPVAL_MINUS_SIGN", minus_sign ? minus_sign : "-");
fill_gpval_string("GPVAL_MICRO", micro ? micro : "u");
fill_gpval_string("GPVAL_DEGREE_SIGN", degree_sign);
}
/* If we are called from int_error() then set the error state */
if (context == 2)
fill_gpval_integer("GPVAL_ERRNO", 1);
/* These initializations need only be done once, on program entry */
if (context == 3) {
struct udvt_entry *v = add_udv_by_name("GPVAL_VERSION");
char *tmp;
if (v && v->udv_value.type == NOTDEFINED)
Gcomplex(&v->udv_value, atof(gnuplot_version), 0);
v = add_udv_by_name("GPVAL_PATCHLEVEL");
if (v && v->udv_value.type == NOTDEFINED)
fill_gpval_string("GPVAL_PATCHLEVEL", gnuplot_patchlevel);
v = add_udv_by_name("GPVAL_COMPILE_OPTIONS");
if (v && v->udv_value.type == NOTDEFINED)
fill_gpval_string("GPVAL_COMPILE_OPTIONS", compile_options);
/* Start-up values */
fill_gpval_integer("GPVAL_MULTIPLOT", 0);
fill_gpval_integer("GPVAL_PLOT", 0);
fill_gpval_integer("GPVAL_SPLOT", 0);
tmp = get_terminals_names();
fill_gpval_string("GPVAL_TERMINALS", tmp);
free(tmp);
fill_gpval_string("GPVAL_ENCODING", encoding_names[encoding]);
/* Permanent copy of user-clobberable variables pi and NaN */
fill_gpval_float("GPVAL_pi", M_PI);
fill_gpval_float("GPVAL_NaN", not_a_number());
/* System information */
fill_gpval_sysinfo();
}
if (context == 3 || context == 4) {
fill_gpval_integer("GPVAL_ERRNO", 0);
fill_gpval_string("GPVAL_ERRMSG","");
fill_gpval_integer("GPVAL_SYSTEM_ERRNO", 0);
fill_gpval_string("GPVAL_SYSTEM_ERRMSG","");
}
/* GPVAL_PWD is unreliable. If the current directory becomes invalid,
* GPVAL_PWD does not reflect this. If this matters, the user can
* instead do something like MY_PWD = "`pwd`"
*/
if (context == 3 || context == 5) {
char *save_file = gp_alloc(PATH_MAX, "GPVAL_PWD");
int ierror = (GP_GETCWD(save_file, PATH_MAX) == NULL);
fill_gpval_string("GPVAL_PWD", ierror ? "" : save_file);
free(save_file);
}
if (context == 6) {
fill_gpval_integer("GPVAL_TERM_WINDOWID", current_x11_windowid);
}
}
/* System information is stored in GPVAL_BITS GPVAL_MACHINE GPVAL_SYSNAME */
#ifdef HAVE_UNAME
# include
#elif defined(_WIN32)
# include
#endif
void
fill_gpval_sysinfo()
{
/* For linux/posix systems with uname */
#ifdef HAVE_UNAME
struct utsname uts;
if (uname(&uts) < 0)
return;
fill_gpval_string("GPVAL_SYSNAME", uts.sysname);
fill_gpval_string("GPVAL_MACHINE", uts.machine);
/* For Windows systems */
#elif defined(_WIN32)
SYSTEM_INFO stInfo;
OSVERSIONINFO osvi;
char s[30];
ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&osvi);
snprintf(s, 30, "Windows_NT-%ld.%ld", osvi.dwMajorVersion, osvi.dwMinorVersion);
fill_gpval_string("GPVAL_SYSNAME", s);
GetSystemInfo(&stInfo);
switch (stInfo.wProcessorArchitecture)
{
case PROCESSOR_ARCHITECTURE_INTEL:
fill_gpval_string("GPVAL_MACHINE", "x86");
break;
case PROCESSOR_ARCHITECTURE_IA64:
fill_gpval_string("GPVAL_MACHINE", "ia64");
break;
case PROCESSOR_ARCHITECTURE_AMD64:
fill_gpval_string("GPVAL_MACHINE", "x86_64");
break;
default:
fill_gpval_string("GPVAL_MACHINE", "unknown");
}
#endif
/* For all systems */
fill_gpval_integer("GPVAL_BITS", 8 * sizeof(void *));
}
/* Callable wrapper for the words() internal function */
int
gp_words(char *string)
{
struct value a;
push(Gstring(&a, string));
f_words((union argument *)NULL);
pop(&a);
return a.v.int_val;
}
/* Callable wrapper for the word() internal function */
char *
gp_word(char *string, int i)
{
struct value a;
push(Gstring(&a, string));
push(Ginteger(&a, (intgr_t)i));
f_word((union argument *)NULL);
pop(&a);
return a.v.string_val;
}