shadow/lib/commonio.h

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/* $Id: commonio.h,v 1.7 2001/08/14 21:09:54 malekith Exp $ */
/*
* Linked list entry.
*/
struct commonio_entry {
char *line;
void *eptr; /* struct passwd, struct spwd, ... */
struct commonio_entry *prev, *next;
int changed:1;
};
/*
* Operations depending on database type: passwd, group, shadow etc.
*/
struct commonio_ops {
/*
* Make a copy of the object (for example, struct passwd)
* and all strings pointed by it, in malloced memory.
*/
void *(*dup)(const void *);
/*
* free() the object including any strings pointed by it.
*/
void (*free)(void *);
/*
* Return the name of the object (for example, pw_name
* for struct passwd).
*/
const char *(*getname)(const void *);
/*
* Parse a string, return object (in static area -
* should be copied using the dup operation above).
*/
void *(*parse)(const char *);
/*
* Write the object to the file (this calls putpwent()
* for struct passwd, for example).
*/
int (*put)(const void *, FILE *);
/*
* fgets and fputs (can be replaced by versions that
* understand line continuation conventions).
*/
char *(*fgets)(char *, int, FILE *);
int (*fputs)(const char *, FILE *);
};
/*
* Database structure.
*/
struct commonio_db {
/*
* Name of the data file.
*/
char filename[1024];
/*
* Operations from above.
*/
struct commonio_ops *ops;
/*
* Currently open file stream.
*/
FILE *fp;
/*
* Head, tail, current position in linked list.
*/
struct commonio_entry *head, *tail, *cursor;
/*
* Various flags.
*/
int changed:1;
int isopen:1;
int locked:1;
int readonly:1;
};
extern int commonio_setname(struct commonio_db *, const char *);
extern int commonio_present(const struct commonio_db *);
extern int commonio_lock(struct commonio_db *);
extern int commonio_lock_nowait(struct commonio_db *);
extern int commonio_open(struct commonio_db *, int);
extern const void *commonio_locate(struct commonio_db *, const char *);
extern int commonio_update(struct commonio_db *, const void *);
extern int commonio_remove(struct commonio_db *, const char *);
extern int commonio_rewind(struct commonio_db *);
extern const void *commonio_next(struct commonio_db *);
extern int commonio_close(struct commonio_db *);
extern int commonio_unlock(struct commonio_db *);
extern void commonio_del_entry(struct commonio_db *, const struct commonio_entry *);
extern int commonio_sort_wrt(struct commonio_db *shadow, struct commonio_db *passwd);
extern int commonio_sort(struct commonio_db *db, int (*cmp)(const void *, const void *));