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deb-mbse/unix/commonio.h
2002-01-05 13:57:10 +00:00

113 lines
2.3 KiB
C

#ifndef _COMMONIO_H
#define _COMMONIO_H
/*
* Linked list entry.
*/
struct commonio_entry {
char *line;
void *entry; /* 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;
int use_lckpwdf:1;
};
int commonio_setname (struct commonio_db *, const char *);
int commonio_present (const struct commonio_db *);
int commonio_lock (struct commonio_db *);
int commonio_lock_nowait (struct commonio_db *);
int commonio_open (struct commonio_db *, int);
const void *commonio_locate (struct commonio_db *, const char *);
int commonio_update (struct commonio_db *, const void *);
int commonio_remove (struct commonio_db *, const char *);
int commonio_rewind (struct commonio_db *);
const void *commonio_next (struct commonio_db *);
int commonio_close (struct commonio_db *);
int commonio_unlock (struct commonio_db *);
void commonio_del_entry (struct commonio_db *, const struct commonio_entry *);
#endif