mirror of
git://projects.qi-hardware.com/wernermisc.git
synced 2024-12-24 07:15:32 +02:00
dd8bb6eecd
- id.c: added section titles - prereq.c (comp_versions), id.h, id.c: moved comp_versions from prereq.c to id.c, to allow sharing with other code
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*
|
|
* id.h - Registry of unique and alphabetically sorted identifiers
|
|
*
|
|
* Written 2010 by Werner Almesberger
|
|
* Copyright 2010 Werner Almesberger
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef ID_H
|
|
#define ID_H
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include "jrb.h"
|
|
|
|
|
|
/*
|
|
* The role of key and value in jrb nodes:
|
|
*
|
|
* - the key points to a "struct id". This "struct id" is unique for the
|
|
* identifier in question and its location can be used to check for equality
|
|
* with a simple pointer comparison.
|
|
*
|
|
* A caller to find_id may therefore be interested in a pointer to the key,
|
|
* even if the content of the key is known.
|
|
*
|
|
* - for the value, we have to distinguish between packages and versions:
|
|
*
|
|
* - package: pointer to the first package definition. If there are multiple
|
|
* packages with the same name, the rest is linked via pkg->more.
|
|
*
|
|
* The value can be NULL if a reference to the package has been
|
|
* encountered, but
|
|
*
|
|
* - the package definition has not been parsed yet,
|
|
* - no corresponding package definition exist (which would be an error),
|
|
* - the reference is an item listed in Provides: (this will change once
|
|
* we handle Provides: properly)
|
|
*
|
|
* - version: the value is not used
|
|
*/
|
|
|
|
|
|
struct id;
|
|
|
|
struct tree {
|
|
int (*comp)(const void *a, const void *b);
|
|
struct jrb *root;
|
|
};
|
|
|
|
struct id {
|
|
struct jrb *jrb;
|
|
const char *s;
|
|
size_t len;
|
|
};
|
|
|
|
|
|
/*
|
|
* Helper macro for printing identifiers.
|
|
* Use with "... %.*s ..."
|
|
*/
|
|
|
|
#define ID2PF(id) (int) (id)->len, (id)->s
|
|
|
|
|
|
int comp_id(const void *a, const void *b);
|
|
int comp_versions(const struct id *va, const struct id *vb);
|
|
|
|
struct tree *make_tree(int (*comp)(const void *a, const void *b));
|
|
struct jrb *make_id(struct tree *tree, const char *s, size_t len);
|
|
const struct jrb *find_id(const struct tree *tree, const char *s, size_t len);
|
|
|
|
#endif /* !ID_H */
|