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111 lines
2.3 KiB
C
111 lines
2.3 KiB
C
/*
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* comp.c - Parameter comparison
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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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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "bitset.h"
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#include "param.h"
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#define EQUAL(relop) ((relop) & (rel_le | rel_eq | rel_ge))
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#define LESS(relop) ((relop) & (rel_lt | rel_le))
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#define GREATER(relop) ((relop) & (rel_ge | rel_gt))
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static int do_comp_name(const char *a, enum relop relop, const char *b)
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{
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int cmp;
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if (EQUAL(relop))
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return a == b;
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cmp = strcmp(a, b);
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assert(cmp);
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if (cmp < 0)
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return LESS(relop);
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else
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return GREATER(relop);
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}
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int comp_name(const struct value *a, enum relop relop, const struct value *b)
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{
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return do_comp_name(a->u.s, relop, b->u.s);
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}
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static int do_comp_set(const struct bitset *a, enum relop relop,
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const struct bitset *b)
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{
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assert(!bitset_empty(a));
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assert(!bitset_empty(b));
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if (EQUAL(relop) && bitset_common(a, b))
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return 1;
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if (LESS(relop) && bitset_first(a) < bitset_last(b))
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return 1;
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if (GREATER(relop) && bitset_last(a) > bitset_first(b))
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return 1;
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return 0;
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}
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int comp_set(const struct value *a, enum relop relop, const struct value *b)
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{
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return do_comp_set(&a->u.set, relop, &b->u.set);
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}
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static int do_comp_abs(double a, enum relop relop, double b)
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{
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if (a == b)
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return EQUAL(relop);
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if (a < b)
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return LESS(relop);
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else
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return GREATER(relop);
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}
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int comp_abs(const struct value *a, enum relop relop, const struct value *b)
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{
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return do_comp_abs(a->u.abs, relop, b->u.abs);
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}
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static int do_comp_rel(const struct rel_value *a, enum relop relop,
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const struct rel_value *b)
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{
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if (a->fract != b->fract)
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return 0;
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if (a->plus == b->plus && a->minus == b->minus)
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return EQUAL(relop);
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if (a->plus <= b->plus && a->minus <= b->minus)
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return LESS(relop);
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if (a->plus >= b->plus && a->minus >= b->minus)
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return GREATER(relop);
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return 0;
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}
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int comp_rel(const struct value *a, enum relop relop, const struct value *b)
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{
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return do_comp_rel(&a->u.rel, relop, &b->u.rel);
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}
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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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{
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return fmt->ops->comp(a, relop, b);
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}
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