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117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
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* db.h - Parts database
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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 DB_H
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#define DB_H
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#include <stdio.h>
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struct exchange {
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const struct currency *dst;
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double rate; /* dst = rate*src */
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struct exchange *next;
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};
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struct currency {
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const char *name;
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struct exchange *exchange;
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struct currency *next;
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};
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/*
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* If quantity increases, next entry is next higher discount.
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* If quantity decreases, next entries are prices after reaching the large
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* quantity.
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*
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* Examples:
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*
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* An order of 12 units with the prices below
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*
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* a) 1 0.5 10 4.0 100 30.0
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* b) 1 0.5 10 4.0 1 0.4 100 30.0
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*
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* would cost
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*
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* a) 1*4.0+2*0.5 = 5.0
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* b) 1*4.0+2*0.4 = 4.8
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*/
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struct price {
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int qty; /* order quantity */
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double value; /* per quantity cost */
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struct price *next; /* next qty */
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};
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struct provider {
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const char *name;
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const struct currency *curr;
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double shipping; /* S&H cost */
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double minimum; /* value of minimum order, before S&H */
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struct provider *next;
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};
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/*
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* Handling of multiple forms of packaging:
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*
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* - category is a keyword that identifies the packaging type, e.g.,
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* T for tape/tray, MAN for manual feeding, etc.
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* - a query can be constrained to a set of categories
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* - conversion options (e.g., "Digi-Reel") can be expressed as additional
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* entries
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*
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* @@@ To do: shared availability
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*/
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struct stock {
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const struct provider *provider;
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const char *cat; /* category */
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int avail; /* items in stock */
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int package; /* "natural" quantity (reel, tray, bag, etc.) */
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const struct currency *curr;
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double add; /* additive element of cost */
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struct price *price;
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} stock;
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struct part {
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const char *domain;
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const char *name;
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struct param *param; /* NULL if @@@ */
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struct stock *stock; /* NULL if vendor part */
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struct part *next; /* alias loop (cyclic) */
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struct part *prev;
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};
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struct part *part_lookup(const char *domain, const char *name);
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struct part *part_add(const char *domain, const char *name);
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void part_alias(struct part *a, struct part *b);
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void part_finalize(struct part *part, const struct action *act);
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void part_add_stock(struct part *part, struct stock *s);
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void part_dump(FILE *file, const struct part *part);
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void parts_dump(FILE *file);
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const struct currency *currency_lookup(const char *name);
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double currency_convert(const struct currency *from, const struct currency *to,
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double value);
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struct currency *currency_add(const char *name);
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void currency_exchange(struct currency *from, const struct currency *to,
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double rate);
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struct provider *provider_lookup(const char *name);
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struct provider *provider_add(const char *name);
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const struct part **select_parametric(struct param *vars,
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const struct action *act);
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#endif /* !DB_H */
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