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83 lines
1.5 KiB
C
83 lines
1.5 KiB
C
/*
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* db.c - 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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#include <glib.h>
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#include "util.h"
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#include "db.h"
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static GTree *tree = NULL;
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static gint comp(gconstpointer a, gconstpointer b)
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{
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const struct part *pa = a;
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const struct part *pb = b;
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/*
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* Just subtracting the pointers may produce values outside the
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* range of gint values.
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*/
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return pa->domain == pb->domain ?
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pa->name < pb->name ? -1 : pa->name > pb->name ? 1 : 0 :
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pa->domain < pb->domain ? -1 : 1;
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}
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struct part *part_lookup(const char *domain, const char *name)
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{
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struct part part = {
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.domain = domain,
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.name = name,
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};
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if (!tree)
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return NULL;
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return g_tree_lookup(tree, &part);
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}
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struct part *part_add(const char *domain, const char *name)
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{
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struct part part = {
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.domain = domain,
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.name = name,
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};
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struct part *p;
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if (!tree)
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tree = g_tree_new(comp);
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p = g_tree_lookup(tree, &part);
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if (!p) {
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p = alloc_type(struct part);
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p->stock = NULL;
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p->next = p->prev = p;
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g_tree_insert(tree, p, p);
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}
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return p;
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}
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void part_alias(struct part *a, struct part *b)
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{
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struct part *tmp, *tmp2;
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tmp = a->next;
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a->next = b;
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b->prev->next = tmp;
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tmp2 = b->prev;
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b->prev = a;
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tmp->prev = tmp2;
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}
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