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/* $Header$
*
* Copyright (c) 2009 Rich Burridge
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include "mp-equation.h"
#define MAXLINE 1024
static void
solve(const char *equation)
{
int ret;
MPEquationOptions options;
MPNumber z;
char result_str[MAXLINE];
memset(&options, 0, sizeof(options));
options.base = 10;
options.wordlen = 32;
options.angle_units = MP_DEGREES;
ret = mp_equation_parse(equation, &options, &z, NULL);
if (ret == PARSER_ERR_MP)
fprintf(stderr, "Error %s\n", mp_get_error());
else if (ret)
fprintf(stderr, "Error %d\n", ret);
else {
mp_cast_to_string(&z, 10, 10, 9, 1, result_str, MAXLINE);
printf("%s\n", result_str);
}
}
/* Adjust user input equation string before solving it. */
static void
str_adjust(char *str)
{
int i, j = 0;
str[strlen(str)-1] = '\0'; /* Remove newline at end of string. */
for (i = 0; str[i] != '\0'; i++) { /* Remove whitespace. */
if (str[i] != ' ' && str[i] != '\t')
str[j++] = str[i];
}
str[j] = '\0';
if (j > 0 && str[j-1] == '=') /* Remove trailing '=' (if present). */
str[j-1] = '\0';
}
int
main(int argc, char **argv)
{
char *equation, *line;
size_t nbytes = MAXLINE;
/* Seed random number generator. */
srand48((long) time((time_t *) 0));
equation = (char *) malloc(MAXLINE * sizeof(char));
while (1) {
printf("> ");
line = fgets(equation, nbytes, stdin);
if (line != NULL)
str_adjust(equation);
if (line == NULL || strcmp(equation, "exit") == 0 || strcmp(equation, "quit") == 0 || strlen(equation) == 0)
break;
solve(equation);
}
free(equation);
return 0;
}
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