common/exf.h

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * %sccs.include.redist.c%
   6  *
   7  *      $Id: exf.h,v 8.20 1993/12/28 16:39:54 bostic Exp $ (Berkeley) $Date: 1993/12/28 16:39:54 $
   8  */
   9                                         /* Undo direction. */
  10 /*
  11  * exf --
  12  *      The file structure.
  13  */
  14 struct _exf {
  15         int      refcnt;                /* Reference count. */
  16
  17                                         /* Underlying database state. */
  18         DB      *db;                    /* File db structure. */
  19         char    *c_lp;                  /* Cached line. */
  20         size_t   c_len;                 /* Cached line length. */
  21         recno_t  c_lno;                 /* Cached line number. */
  22         recno_t  c_nlines;              /* Cached lines in the file. */
  23
  24         DB      *log;                   /* Log db structure. */
  25         char    *l_lp;                  /* Log buffer. */
  26         size_t   l_len;                 /* Log buffer length. */
  27         recno_t  l_high;                /* Log last + 1 record number. */
  28         recno_t  l_cur;                 /* Log current record number. */
  29         MARK     l_cursor;              /* Log cursor position. */
  30         enum direction lundo;           /* Last undo direction. */
  31
  32         LIST_HEAD(_markh, _mark) marks; /* Linked list of file MARK's. */
  33
  34         /*
  35          * Paths for the recovery mail file and the vi recovery file and
  36          * a file descriptor for the former.  We keep a file descriptor
  37          * to the recovery file open and locked, while the file is in use.
  38          * This allows the recovery option to distinguish between files
  39          * that are live, and those that should be recovered.
  40          *
  41          * F_RCV_ON is set as long as we believe that the file is recoverable.
  42          * This doesn't mean that any initialization has been done, however.
  43          * If F_RCV_NORM is not set and rcv_path and rcv_mpath are not NULL,
  44          * they are unlinked on file exit.  If not NULL they are free'd on file
  45          * exit.  On file exit, if rcv_fd is not -1, it is closed.
  46          */
  47 #define RCV_PERIOD      120             /* Sync every two minutes. */
  48         char    *rcv_path;              /* Recover file name. */
  49         char    *rcv_mpath;             /* Recover mail file name. */
  50         int      rcv_fd;                /* Locked mail file descriptor. */
  51
  52 #define F_FIRSTMODIFY   0x001           /* File not yet modified. */
  53 #define F_MODIFIED      0x002           /* File is currently dirty. */
  54 #define F_MULTILOCK     0x004           /* Multiple processes running, lock. */
  55 #define F_NOLOG         0x008           /* Logging turned off. */
  56 #define F_RCV_ALRM      0x010           /* File needs to be synced. */
  57 #define F_RCV_NORM      0x020           /* Don't delete recovery files. */
  58 #define F_RCV_ON        0x040           /* Recovery is possible. */
  59 #define F_UNDO          0x080           /* No change since last undo. */
  60         u_int    flags;
  61 };
  62
  63 /* Flags to file_write(). */
  64 #define FS_ALL          0x01            /* Write the entire file. */
  65 #define FS_APPEND       0x02            /* Append to the file. */
  66 #define FS_FORCE        0x04            /* Force is set. */
  67 #define FS_POSSIBLE     0x08            /* Force could be set. */
  68
  69 #define GETLINE_ERR(sp, lno) {                                          \
  70         msgq((sp), M_ERR,                                               \
  71             "Error: %s/%d: unable to retrieve line %u.",                \
  72             tail(__FILE__), __LINE__, (lno));                           \
  73 }
  74
  75 /* FREF routines. */
  76 FREF    *file_add __P((SCR *, FREF *, CHAR_T *, int));
  77 FREF    *file_first __P((SCR *));
  78 FREF    *file_next __P((SCR *, FREF *));
  79 FREF    *file_prev __P((SCR *, FREF *));
  80 FREF    *file_unedited __P((SCR *));
  81
  82 /* EXF routines. */
  83 int      file_end __P((SCR *, EXF *, int));
  84 int      file_init __P((SCR *, FREF *, char *, int));
  85 int      file_write __P((SCR *, EXF *, MARK *, MARK *, char *, int));
  86
  87 /* Recovery routines. */
  88 void     rcv_hup __P((void));
  89 int      rcv_init __P((SCR *, EXF *));
  90 int      rcv_list __P((SCR *));
  91 int      rcv_read __P((SCR *, char *));
  92 int      rcv_sync __P((SCR *, EXF *));
  93 void     rcv_term __P((void));
  94 int      rcv_tmp __P((SCR *, EXF *, char *));
  95
  96 /* DB interface routines */
  97 int      file_aline __P((SCR *, EXF *, int, recno_t, char *, size_t));
  98 int      file_dline __P((SCR *, EXF *, recno_t));
  99 char    *file_gline __P((SCR *, EXF *, recno_t, size_t *));
 100 int      file_iline __P((SCR *, EXF *, recno_t, char *, size_t));
 101 int      file_lline __P((SCR *, EXF *, recno_t *));
 102 char    *file_rline __P((SCR *, EXF *, recno_t, size_t *));
 103 int      file_sline __P((SCR *, EXF *, recno_t, char *, size_t));