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14bc006ada
evaluating the 'Variables' section in the config file git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@307 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
104 lines
4.2 KiB
C
104 lines
4.2 KiB
C
/* $Id: evaluator.h,v 1.3 2004/01/12 03:51:01 reinelt Exp $
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*
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* expression evaluation
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*
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* based on EE (Expression Evaluator) which is
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* (c) 1992 Mark Morley <morley@Camosun.BC.CA>
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*
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* heavily modified 2003 by Michael Reinelt <reinelt@eunet.at>
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*
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* FIXME: GPL or not GPL????
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*
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* $Log: evaluator.h,v $
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* Revision 1.3 2004/01/12 03:51:01 reinelt
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* evaluating the 'Variables' section in the config file
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*
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* Revision 1.2 2003/10/11 06:01:53 reinelt
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*
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* renamed expression.{c,h} to client.{c,h}
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* added config file client
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* new functions 'AddNumericVariable()' and 'AddStringVariable()'
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* new parameter '-i' for interactive mode
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*
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* Revision 1.1 2003/10/06 04:34:06 reinelt
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* expression evaluator added
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*
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*/
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/***************************************************************************
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** **
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** EE.C Expression Evaluator **
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** **
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** AUTHOR: Mark Morley **
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** COPYRIGHT: (c) 1992 by Mark Morley **
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** DATE: December 1991 **
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** HISTORY: Jan 1992 - Made it squash all command line arguments **
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** into one big long string. **
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** - It now can set/get VMS symbols as if they **
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** were variables. **
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** - Changed max variable name length from 5 to 15 **
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** Jun 1992 - Updated comments and docs **
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** **
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** You are free to incorporate this code into your own works, even if it **
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** is a commercial application. However, you may not charge anyone else **
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** for the use of this code! If you intend to distribute your code, **
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** I'd appreciate it if you left this message intact. I'd like to **
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** receive credit wherever it is appropriate. Thanks! **
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** **
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** I don't promise that this code does what you think it does... **
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** **
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** Please mail any bug reports/fixes/enhancments to me at: **
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** morley@camosun.bc.ca **
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** or **
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** Mark Morley **
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** 3889 Mildred Street **
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** Victoria, BC Canada **
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** V8Z 7G1 **
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** (604) 479-7861 **
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** **
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***************************************************************************/
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#ifndef _EVALUATOR_H_
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#define _EVALUATOR_H_
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// RESULT bitmask
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#define R_NUMBER 1
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#define R_STRING 2
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typedef struct {
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int type;
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double number;
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char *string;
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} RESULT;
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// error codes
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#define E_OK 0 /* Successful evaluation */
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#define E_SYNTAX 1 /* Syntax error */
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#define E_UNBALAN 2 /* Unbalanced parenthesis */
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#define E_DIVZERO 3 /* Attempted division by zero */
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#define E_UNKNOWN 4 /* Reference to unknown variable */
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#define E_BADFUNC 5 /* Unrecognised function */
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#define E_NUMARGS 6 /* Wrong number of arguments to function */
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#define E_NOARG 7 /* Missing an argument to a function */
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#define E_EMPTY 8 /* Empty expression */
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void DelResult (RESULT *result);
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int SetVariable (char *name, RESULT *value);
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int AddNumericVariable (char *name, double value);
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int AddStringVariable (char *name, char *value);
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int AddFunction (char *name, int args, void (*func)());
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RESULT* SetResult (RESULT **result, int type, void *value);
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double R2N (RESULT *result);
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char* R2S (RESULT *result);
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int Eval (char* expression, RESULT *result);
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#endif
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