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100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/*
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* param.h - Parameters and values
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*
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* Copyright 2012 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef PARAM_H
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#define PARAM_H
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#include "bitset.h"
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/*
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* Parameter types:
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*
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* "name" arbitrary name
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* "set" names from an ordered list
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* "abs" absolute numeric value
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* "rel" numeric value relative to another parameter
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*/
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enum relop {
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rel_lt = 1 << 0,
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rel_le = 1 << 1,
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rel_eq = 1 << 2,
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rel_ge = 1 << 3,
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rel_gt = 1 << 4,
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};
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struct equiv {
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const char *name;
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struct equiv *next;
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};
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struct names {
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struct equiv *equiv; /* equivalent value(s) */
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struct names *next; /* next/greater value */
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};
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struct param_ops;
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struct format {
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const struct param_ops *ops;
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union {
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const struct names *set;
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const char *abs; /* unit name */
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const struct format *rel;
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} u;
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};
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struct value {
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union {
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const char *name;
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struct bitset set;
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double abs;
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struct rel_value {
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double plus, minus;
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int fract; /* 0: abs. offset; 1: fract. offs. */
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} rel;
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} u;
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};
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struct param_ops {
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int (*eval)(const struct format *fmt, const char *s,
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struct value *res);
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int (*comp)(const struct value *a, enum relop relop,
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const struct value *b);
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};
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void register_nameset(const char *name, const struct names *set);
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const struct names *find_nameset(const char *name);
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int eval_name(const struct format *fmt, const char *s, struct value *res);
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int eval_set(const struct format *fmt, const char *s, struct value *res);
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int eval_abs(const struct format *fmt, const char *s, struct value *res);
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int eval_rel(const struct format *fmt, const char *s, struct value *res);
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int evaluate(const struct format *fmt, const char *s, struct value *res);
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int comp_name(const struct value *a, enum relop relop, const struct value *b);
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int comp_set(const struct value *a, enum relop relop, const struct value *b);
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int comp_abs(const struct value *a, enum relop relop, const struct value *b);
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int comp_rel(const struct value *a, enum relop relop, const struct value *b);
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int compare(const struct format *fmt,
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const struct value *a, enum relop relop, const struct value *b);
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extern const struct param_ops param_ops_name;
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extern const struct param_ops param_ops_set;
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extern const struct param_ops param_ops_abs;
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extern const struct param_ops param_ops_rel;
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#endif /* !PARAM_H */
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