forked from gnuplot/gnuplot-old
/
eval.c
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/
eval.c
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#ifndef lint
static char *RCSid = "$Id: eval.c,v 1.1.1.2 1998/04/15 19:22:21 lhecking Exp $";
#endif
/* GNUPLOT - eval.c */
/*[
* Copyright 1986 - 1993, 1998 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 "plot.h"
struct udvt_entry *
add_udv(t_num) /* find or add value and return pointer */
int t_num;
{
register struct udvt_entry **udv_ptr = &first_udv;
/* check if it's already in the table... */
while (*udv_ptr) {
if (equals(t_num,(*udv_ptr)->udv_name))
return(*udv_ptr);
udv_ptr = &((*udv_ptr)->next_udv);
}
*udv_ptr = (struct udvt_entry *)
gp_alloc((unsigned long)sizeof(struct udvt_entry), "value");
(*udv_ptr)->next_udv = NULL;
copy_str((*udv_ptr)->udv_name,t_num, MAX_ID_LEN);
(*udv_ptr)->udv_value.type = INTGR; /* not necessary, but safe! */
(*udv_ptr)->udv_undef = TRUE;
return(*udv_ptr);
}
struct udft_entry *
add_udf(t_num) /* find or add function and return pointer */
int t_num; /* index to token[] */
{
register struct udft_entry **udf_ptr = &first_udf;
int i;
while (*udf_ptr) {
if (equals(t_num,(*udf_ptr)->udf_name))
return(*udf_ptr);
udf_ptr = &((*udf_ptr)->next_udf);
}
/* get here => not found. udf_ptr points at first_udf or
* next_udf field of last udf
*/
if (standard(t_num))
int_warn("Warning : udf shadowed by built-in function of the same name", t_num);
/* create and return a new udf slot */
*udf_ptr = (struct udft_entry *)
gp_alloc((unsigned long)sizeof(struct udft_entry), "function");
(*udf_ptr)->next_udf = (struct udft_entry *) NULL;
(*udf_ptr)->definition = NULL;
(*udf_ptr)->at = NULL;
copy_str((*udf_ptr)->udf_name,t_num, MAX_ID_LEN);
for(i=0; i<MAX_NUM_VAR; i++)
(void) Ginteger(&((*udf_ptr)->dummy_values[i]), 0);
return(*udf_ptr);
}
int standard(t_num) /* return standard function index or 0 */
int t_num;
{
register int i;
for (i = (int)SF_START; ft[i].f_name != NULL; i++) {
if (equals(t_num,ft[i].f_name))
return(i);
}
return(0);
}
void execute_at(at_ptr)
struct at_type *at_ptr;
{
register int i,index,count,offset;
count = at_ptr->a_count;
for (i = 0; i < count;) {
index = (int)at_ptr->actions[i].index;
offset = (*ft[index].func)(&(at_ptr->actions[i].arg));
if (is_jump(index))
i += offset;
else
i++;
}
}
/*
'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 exectues the function indexed by the at_ptr and
passes the address of the argument which is pointed to by the arg_ptr
*/