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[calc.git] / program.c

#include <malloc.h>
#include <stdio.h>
#include <string.h>

#include "alloc.h"
#include "argument.h"
#include "debug.h"
#include "parser.h"
#include "stack.h"
#include "storage.h"
#include "tabular.h"

#include "program.h"

/* global variables */

workspace_t *programs = NULL;
int nb_programs = 0;

/* program function */

void prog (int id, element_t *root)
{
    int i, n = -1;

    if (programs == NULL) {

        /* initial memory allocation */
        programs = (workspace_t *) callocordie (1, sizeof (workspace_t));
        nb_programs = 1;
        n = 0;

    } else {

        /* look for existing program */
        for (i = 0; i < nb_programs; i++) {
            if ((programs + i)->id == id) {
                n = i;
                break;
            }
        }
        if (n == -1) {

            /* new program */
            n = nb_programs++;
            workspace_t *tmp = (workspace_t *) callocordie (nb_programs, sizeof (workspace_t));
            memcpy (tmp, programs, (nb_programs - 1) * sizeof (workspace_t));
            free (programs);
            programs = tmp;
        } else {

            /* clean old program */
            if ((programs + n)->storage) {
                free_tab ((programs + n)->storage);
            }
            if ((programs + n)->stack) {
                free_tab ((programs + n)->stack);
            }
            if ((programs + n)->root) {
                delelement ((programs + n)->root);
            }
            if ((programs + n)->string) {
                free ((programs + n)->string);
                (programs + n)->string = NULL;
            }
        }
    }

    /* set program */
    (programs + n)->id = id;
    (programs + n)->answer = 0;
    (programs + n)->storage = NULL;
    (programs + n)->stack = NULL;
    (programs + n)->root = dupelement (root);
}

double call (int id, int nbargs, element_t **args)
{
    workspace_t tmp = {0};
    int i, n = -1;
    double ret = 0;

    if (programs) {

        /* look for program */
        for (i = 0; i < nb_programs; i++) {
            if ((programs + i)->id == id) {
                n = i;
                break;
            }
        }
    }
    if (n == -1) {
        VERBOSE (WARNING, fprintf (stdout, "error unknown program (%d)\n", id));
        return 0;
    }

    /* store context */
    tmp.answer = answer;
    tmp.argument = argument;
    tmp.stack = stack;
    tmp.storage = storage;

    /* change context */
    answer = 0;
    argument = NULL;
    if (nbargs > 0) {
        def (nbargs, args);
    }
    stack = (programs + n)->stack;
    storage = (programs + n)->storage;

    /* evaluate program */
    element_t *elements = dupelement ((programs + n)->root);
    ret = evaluate_element (elements, 0);
    delelement (elements);

    /* cleaning context */
    (programs + n)->answer = answer;
    if (argument) {
        free_tab (argument);
    }
    (programs + n)->stack = stack;
    (programs + n)->storage = storage;

    /* restore context */
    answer = tmp.answer;
    argument = tmp.argument;
    storage = tmp.storage;
    stack = tmp.stack;

    return ret;
}

void list ()
{
    int i;
    fprintf (stdout, "programs:");
    for (i = 0; i < nb_programs; i++) {
        fprintf (stdout, " %d", (programs + i)->id);
    }
    fprintf (stdout, "\n");
}

void edit (int id)
{
    int i, n = -1;

    if (programs) {

        /* look for program */
        for (i = 0; i < nb_programs; i++) {
            if ((programs + i)->id == id) {
                n = i;
                break;
            }
        }
    }
    if (n == -1) {
        VERBOSE (WARNING, fprintf (stdout, "error unknown program (%d)\n", id));
        return;
    }

    /* set string program */
    fprintf (stdout, "edit: %s\n", (programs + n)->string);
}

void savestring (int id, char *string)
{
    int i, n = -1;

    if (programs) {

        /* look for program */
        for (i = 0; i < nb_programs; i++) {
            if ((programs + i)->id == id) {
                n = i;
                break;
            }
        }
    }

    /* unnecesary code */
    //if (n == -1) {
    //    VERBOSE (WARNING, fprintf (stdout, "error unknown program (%d)\n", id));
    //    return;
    //}
    //if ((programs + n)->string) {
    //    free ((programs + n)->string);
    //}

    if (string) {
        (programs + n)->string = strdup (string);
    }
}

void del (int id)
{
    int i, j, n = -1;

    if (programs) {

        /* look for program */
        for (i = 0; i < nb_programs; i++) {
            if ((programs + i)->id == id) {
                n = i;
                break;
            }
        }
    }
    if (n == -1) {
        VERBOSE (WARNING, fprintf (stdout, "error unknown program (%d)\n", id));
        return;
    }

    /* clean program */
    if ((programs + n)->storage) {
        free_tab ((programs + n)->storage);
    }
    if ((programs + n)->stack) {
        free_tab ((programs + n)->stack);
    }
    if ((programs + n)->root) {
        delelement ((programs + n)->root);
    }
    if ((programs + n)->string) {
        free ((programs + n)->string);
    }

    /* remove entry */
    workspace_t *tmp = (workspace_t *) callocordie (nb_programs - 1, sizeof (workspace_t));
    for (i = 0, j = 0; i < nb_programs; i++) {
        if (i != n) {
            memcpy (tmp + j, programs + i, sizeof (workspace_t));
            j++;
        }
    }
    free (programs);
    programs = tmp;
    nb_programs--;
}

/* vim: set ts=4 sw=4 et: */