src/gcalccmd.c

   1 /*  $Header$
   2  *
   3  *  Copyright (c) 2009 Rich Burridge
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2, or (at your option)
   8  *  any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful, but
  11  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  *  General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  *  02111-1307, USA.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/types.h>
  25 #include <time.h>
  26 #include <locale.h>
  27
  28 #include "mp-equation.h"
  29 #include "mp-serializer.h"
  30
  31 #define MAXLINE 1024
  32
  33 static MpSerializer *result_serializer;
  34
  35 static void
  36 solve(const char *equation)
  37 {
  38     int ret;
  39     MPEquationOptions options;
  40     MPNumber z;
  41     gchar *result_str = NULL;
  42
  43     memset(&options, 0, sizeof(options));
  44     options.base = 10;
  45     options.wordlen = 32;
  46     options.angle_units = MP_DEGREES;
  47
  48     ret = mp_equation_parse(equation, &options, &z, NULL);
  49
  50     if (ret == PARSER_ERR_MP)
  51         fprintf(stderr, "Error %s\n", mp_get_error());
  52     else if (ret)
  53         fprintf(stderr, "Error %d\n", ret);
  54     else {
  55         result_str = mp_serializer_to_string(result_serializer, &z);
  56         printf("%s\n", result_str);
  57     }
  58     g_free(result_str);
  59 }
  60
  61
  62 /* Adjust user input equation string before solving it. */
  63 static void
  64 str_adjust(char *str)
  65 {
  66     int i, j = 0;
  67
  68     str[strlen(str)-1] = '\0';        /* Remove newline at end of string. */
  69     for (i = 0; str[i] != '\0'; i++) {        /* Remove whitespace. */
  70         if (str[i] != ' ' && str[i] != '\t')
  71             str[j++] = str[i];
  72     }
  73     str[j] = '\0';
  74     if (j > 0 && str[j-1] == '=')     /* Remove trailing '=' (if present). */
  75         str[j-1] = '\0';
  76 }
  77
  78 int
  79 main(int argc, char **argv)
  80 {
  81     char *equation, *line;
  82     size_t nbytes = MAXLINE;
  83
  84     /* Seed random number generator. */
  85     srand48((long) time((time_t *) 0));
  86
  87     g_type_init ();
  88     setlocale(LC_ALL, "");
  89
  90     result_serializer = mp_serializer_new(MP_DISPLAY_FORMAT_AUTOMATIC, 10, 9);
  91
  92     equation = (char *) malloc(MAXLINE * sizeof(char));
  93     while (1) {
  94         printf("> ");
  95         line = fgets(equation, nbytes, stdin);
  96
  97         if (line != NULL)
  98             str_adjust(equation);
  99
 100         if (line == NULL || strcmp(equation, "exit") == 0 || strcmp(equation, "quit") == 0 || strlen(equation) == 0)
 101             break;
 102
 103         solve(equation);
 104     }
 105     free(equation);
 106
 107     return 0;
 108 }