/*      $OpenBSD: rcs.h,v 1.19 2024/05/21 05:00:48 jsg Exp $    */
/*
 * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef RCS_H
#define RCS_H

#include <sys/queue.h>

#include <stdio.h>

#include "buf.h"

#define RCS_DIFF_MAXARG         32
#define RCS_DIFF_DIV \
        "==================================================================="

#define RCSDIR                  "RCS"
#define RCS_FILE_EXT            ",v"

#define RCS_HEAD_BRANCH         "HEAD"
#define RCS_HEAD_INIT           "1.1"
#define RCS_HEAD_REV            ((RCSNUM *)(-1))


#define RCS_STATE_INVALCHAR     "$,:;@"
#define RCS_SYM_INVALCHAR       "$,.:;@"

#define RCS_MAGIC_BRANCH        ".0."
#define RCS_STATE_EXP           "Exp"
#define RCS_STATE_DEAD          "dead"

/* lock types */
#define RCS_LOCK_INVAL          (-1)
#define RCS_LOCK_LOOSE          0
#define RCS_LOCK_STRICT         1

/*
 * Keyword expansion table
 */
#define RCS_KW_AUTHOR           0x1000
#define RCS_KW_DATE             0x2000
#define RCS_KW_LOG              0x4000
#define RCS_KW_NAME             0x8000
#define RCS_KW_RCSFILE          0x0100
#define RCS_KW_REVISION         0x0200
#define RCS_KW_SOURCE           0x0400
#define RCS_KW_STATE            0x0800
#define RCS_KW_FULLPATH         0x0010
#define RCS_KW_MDOCDATE         0x0020
#define RCS_KW_LOCKER           0x10000

#define RCS_KW_ID \
        (RCS_KW_RCSFILE | RCS_KW_REVISION | RCS_KW_DATE \
        | RCS_KW_AUTHOR | RCS_KW_STATE | RCS_KW_LOCKER)

#define RCS_KW_HEADER   (RCS_KW_ID | RCS_KW_FULLPATH)

/* RCS keyword expansion modes (kflags) */
#define RCS_KWEXP_NONE  0x00
#define RCS_KWEXP_NAME  0x01    /* include keyword name */
#define RCS_KWEXP_VAL   0x02    /* include keyword value */
#define RCS_KWEXP_LKR   0x04    /* include name of locker */
#define RCS_KWEXP_OLD   0x08    /* generate old keyword string */
#define RCS_KWEXP_ERR   0x10    /* mode has an error */

#define RCS_KWEXP_DEFAULT       (RCS_KWEXP_NAME | RCS_KWEXP_VAL)
#define RCS_KWEXP_KVL           (RCS_KWEXP_NAME | RCS_KWEXP_VAL | RCS_KWEXP_LKR)

#define RCS_KWEXP_INVAL(k) \
        ((k & RCS_KWEXP_ERR) || \
        ((k & RCS_KWEXP_OLD) && (k & ~RCS_KWEXP_OLD)))

struct rcs_kw {
        char    kw_str[16];
        int     kw_type;
};

#define RCS_NKWORDS     (sizeof(rcs_expkw)/sizeof(rcs_expkw[0]))

#define RCSNUM_MAXNUM   USHRT_MAX
#define RCSNUM_MAXLEN   64

#define RCSNUM_ISBRANCH(n)      ((n)->rn_len % 2)
#define RCSNUM_ISBRANCHREV(n)   (!((n)->rn_len % 2) && ((n)->rn_len >= 4))
#define RCSNUM_NO_MAGIC         (1<<0)

/* file flags */
#define RCS_READ          (1<<0)
#define RCS_WRITE         (1<<1)
#define RCS_RDWR          (RCS_READ|RCS_WRITE)
#define RCS_CREATE        (1<<2)  /* create the file */
#define RCS_PARSE_FULLY   (1<<3)  /* fully parse it on open */

/* internal flags */
#define RCS_PARSED        (1<<4)  /* file has been parsed */
#define RCS_SYNCED        (1<<5)  /* in-mem copy is sync with disk copy */
#define RCS_SLOCK         (1<<6)  /* strict lock */

/* parser flags */
#define PARSED_DELTAS     (1<<7)  /* all deltas are parsed */
#define PARSED_DESC       (1<<8)  /* the description is parsed */
#define PARSED_DELTATEXTS (1<<9)  /* all delta texts are parsed */

/* delta flags */
#define RCS_RD_DEAD     0x01    /* dead */
#define RCS_RD_SELECT   0x02    /* select for operation */

/* RCS error codes */
#define RCS_ERR_NOERR   0
#define RCS_ERR_NOENT   1
#define RCS_ERR_DUPENT  2
#define RCS_ERR_BADNUM  3
#define RCS_ERR_BADSYM  4
#define RCS_ERR_PARSE   5
#define RCS_ERR_ERRNO   255

/* used for rcs_checkout_rev */
#define CHECKOUT_REV_CREATED    1
#define CHECKOUT_REV_MERGED     2
#define CHECKOUT_REV_REMOVED    3
#define CHECKOUT_REV_UPDATED    4

/* commitids in cvs/cvsnt can be up to 64 bytes */
#define RCS_COMMITID_MAXLEN 64

typedef struct rcs_num {
        u_int            rn_len;
        u_int16_t       *rn_id;
} RCSNUM;

struct rcs_access {
        char                    *ra_name;
        TAILQ_ENTRY(rcs_access)  ra_list;
};

struct rcs_sym {
        char                    *rs_name;
        RCSNUM                  *rs_num;
        TAILQ_ENTRY(rcs_sym)     rs_list;
};

struct rcs_lock {
        char    *rl_name;
        RCSNUM  *rl_num;

        TAILQ_ENTRY(rcs_lock)    rl_list;
};

struct rcs_branch {
        RCSNUM                  *rb_num;
        TAILQ_ENTRY(rcs_branch)  rb_list;
};

TAILQ_HEAD(rcs_dlist, rcs_delta);

struct rcs_delta {
        RCSNUM          *rd_num;
        RCSNUM          *rd_next;
        u_int            rd_flags;
        struct tm        rd_date;
        char            *rd_author;
        char            *rd_state;
        char            *rd_commitid;
        char            *rd_log;
        char            *rd_locker;
        u_char          *rd_text;
        size_t           rd_tlen;

        TAILQ_HEAD(, rcs_branch)        rd_branches;
        TAILQ_ENTRY(rcs_delta)          rd_list;
};


typedef struct rcs_file {
        FILE    *rf_file;
        char    *rf_path;
        mode_t   rf_mode;
        u_int    rf_flags;

        RCSNUM  *rf_head;
        RCSNUM  *rf_branch;
        char    *rf_comment;
        char    *rf_expand;
        char    *rf_desc;

        u_int                                   rf_ndelta;
        struct rcs_dlist                        rf_delta;
        TAILQ_HEAD(rcs_alist, rcs_access)       rf_access;
        TAILQ_HEAD(rcs_slist, rcs_sym)          rf_symbols;
        TAILQ_HEAD(rcs_llist, rcs_lock)         rf_locks;

        void    *rf_pdata;
} RCSFILE;

extern int rcs_errno;

RCSFILE                 *rcs_open(const char *, int, int, ...);
void                     rcs_close(RCSFILE *);
int                      rcs_head_set(RCSFILE *, RCSNUM *);
const RCSNUM            *rcs_branch_get(RCSFILE *);
int                      rcs_access_add(RCSFILE *, const char *);
int                      rcs_access_remove(RCSFILE *, const char *);
struct rcs_delta        *rcs_findrev(RCSFILE *, RCSNUM *);
int                      rcs_sym_add(RCSFILE *, const char *, RCSNUM *);
int                      rcs_sym_remove(RCSFILE *, const char *);
RCSNUM                  *rcs_sym_getrev(RCSFILE *, const char *);
int                      rcs_sym_check(const char *);
int                      rcs_lock_getmode(RCSFILE *);
int                      rcs_lock_setmode(RCSFILE *, int);
int                      rcs_lock_add(RCSFILE *, const char *, RCSNUM *);
int                      rcs_lock_remove(RCSFILE *, const char *, RCSNUM *);
BUF                     *rcs_getrev(RCSFILE *, RCSNUM *);
int                      rcs_deltatext_set(RCSFILE *, RCSNUM *, BUF *);
void                     rcs_desc_set(RCSFILE *, const char *);
void                     rcs_comment_set(RCSFILE *, const char *);
BUF                     *rcs_kwexp_buf(BUF *, RCSFILE *, RCSNUM *);
void                     rcs_kwexp_set(RCSFILE *, int);
int                      rcs_kwexp_get(RCSFILE *);
int                      rcs_rev_add(RCSFILE *, RCSNUM *, const char *, time_t,
                             const char *);
time_t                   rcs_rev_getdate(RCSFILE *, RCSNUM *);
int                      rcs_rev_setlog(RCSFILE *, RCSNUM *, const char *);
int                      rcs_rev_remove(RCSFILE *, RCSNUM *);
int                      rcs_state_set(RCSFILE *, RCSNUM *, const char *);
int                      rcs_state_check(const char *);
void                     rcs_write(RCSFILE *);
void                     rcs_delta_stats(struct rcs_delta *, int *, int *);

int     rcs_kflag_get(const char *);

RCSNUM  *rcsnum_alloc(void);
RCSNUM  *rcsnum_parse(const char *);
RCSNUM  *rcsnum_brtorev(const RCSNUM *);
RCSNUM  *rcsnum_revtobr(const RCSNUM *);
RCSNUM  *rcsnum_inc(RCSNUM *);
void     rcsnum_free(RCSNUM *);
int      rcsnum_addmagic(RCSNUM *);
int      rcsnum_aton(const char *, const char **, RCSNUM *);
char    *rcsnum_tostr(const RCSNUM *, char *, size_t);
void     rcsnum_cpy(const RCSNUM *, RCSNUM *, u_int);
int      rcsnum_cmp(const RCSNUM *, const RCSNUM *, u_int);

/* rcstime.c */
void     rcs_set_tz(char *, struct rcs_delta *, struct tm *);
extern char *timezone_flag;
extern int rcsnum_flags;

#endif  /* RCS_H */