usr/src/sbin/dump/itime.c

/*-
 * Copyright (c) 1980 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)itime.c     5.10 (Berkeley) %G%";
#endif /* not lint */

#ifdef sunos
#include <stdio.h>
#include <ctype.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/dir.h>
#include <sys/vnode.h>
#include <ufs/inode.h>
#include <ufs/fs.h>
#else
#include <sys/param.h>
#include <ufs/ufs/dinode.h>
#endif
#include <fcntl.h>
#include <protocols/dumprestore.h>
#include <errno.h>
#include <stdio.h>
#ifdef __STDC__
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "dump.h"

struct  dumpdates **ddatev = 0;
int     nddates = 0;
int     ddates_in = 0;
struct  dumptime *dthead = 0;

void    readdumptimes();
int     getrecord();
int     makedumpdate();

static void dumprecout();

void
initdumptimes()
{
        FILE *df;

        if ((df = fopen(dumpdates, "r")) == NULL) {
                if (errno != ENOENT) {
                        quit("cannot read %s: %s\n", dumpdates,
                            strerror(errno));
                        /* NOTREACHED */
                }
                /*
                 * Dumpdates does not exist, make an empty one.
                 */
                msg("WARNING: no file `%s', making an empty one\n", dumpdates);
                if ((df = fopen(dumpdates, "w")) == NULL) {
                        quit("cannot create %s: %s\n", dumpdates,
                            strerror(errno));
                        /* NOTREACHED */
                }
                (void) fclose(df);
                if ((df = fopen(dumpdates, "r")) == NULL) {
                        quit("cannot read %s even after creating it: %s\n",
                            dumpdates, strerror(errno));
                        /* NOTREACHED */
                }
        }
        (void) flock(fileno(df), LOCK_SH);
        readdumptimes(df);
        fclose(df);
}

void
readdumptimes(df)
        FILE *df;
{
        register int i;
        register struct dumptime *dtwalk;

        for (;;) {
                dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime));
                if (getrecord(df, &(dtwalk->dt_value)) < 0)
                        break;
                nddates++;
                dtwalk->dt_next = dthead;
                dthead = dtwalk;
        }

        ddates_in = 1;
        /*
         *      arrayify the list, leaving enough room for the additional
         *      record that we may have to add to the ddate structure
         */
        ddatev = (struct dumpdates **)
                calloc(nddates + 1, sizeof (struct dumpdates *));
        dtwalk = dthead;
        for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next)
                ddatev[i] = &dtwalk->dt_value;
}

void
getdumptime()
{
        register struct dumpdates *ddp;
        register int i;
        char *fname;

        fname = disk;
#ifdef FDEBUG
        msg("Looking for name %s in dumpdates = %s for level = %c\n",
                fname, dumpdates, level);
#endif
        spcl.c_ddate = 0;
        lastlevel = '0';

        initdumptimes();
        /*
         *      Go find the entry with the same name for a lower increment
         *      and older date
         */
        ITITERATE(i, ddp) {
                if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0)
                        continue;
                if (ddp->dd_level >= level)
                        continue;
                if (ddp->dd_ddate <= spcl.c_ddate)
                        continue;
                spcl.c_ddate = ddp->dd_ddate;
                lastlevel = ddp->dd_level;
        }
}

void
putdumptime()
{
        FILE *df;
        register struct dumpdates *dtwalk;
        register int i;
        int fd;
        char *fname;

        if(uflag == 0)
                return;
        if ((df = fopen(dumpdates, "r+")) == NULL)
                quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno));
        fd = fileno(df);
        (void) flock(fd, LOCK_EX);
        fname = disk;
        free(ddatev);
        ddatev = 0;
        nddates = 0;
        dthead = 0;
        ddates_in = 0;
        readdumptimes(df);
        if (fseek(df, 0L, 0) < 0)
                quit("fseek: %s\n", strerror(errno));
        spcl.c_ddate = 0;
        ITITERATE(i, dtwalk) {
                if (strncmp(fname, dtwalk->dd_name,
                                sizeof (dtwalk->dd_name)) != 0)
                        continue;
                if (dtwalk->dd_level != level)
                        continue;
                goto found;
        }
        /*
         *      construct the new upper bound;
         *      Enough room has been allocated.
         */
        dtwalk = ddatev[nddates] =
                (struct dumpdates *)calloc(1, sizeof(struct dumpdates));
        nddates += 1;
  found:
        (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name));
        dtwalk->dd_level = level;
        dtwalk->dd_ddate = spcl.c_date;

        ITITERATE(i, dtwalk) {
                dumprecout(df, dtwalk);
        }
        if (fflush(df))
                quit("%s: %s\n", dumpdates, strerror(errno));
        if (ftruncate(fd, ftell(df)))
                quit("ftruncate (%s): %s\n", dumpdates, strerror(errno));
        (void) fclose(df);
        msg("level %c dump on %s", level,
                spcl.c_date == 0 ? "the epoch\n" : ctime(&spcl.c_date));
}

static void
dumprecout(file, what)
        FILE *file;
        struct dumpdates *what;
{

        if (fprintf(file, DUMPOUTFMT,
                    what->dd_name,
                    what->dd_level,
                    ctime(&what->dd_ddate)) < 0)
                quit("%s: %s\n", dumpdates, strerror(errno));
}

int     recno;
int
getrecord(df, ddatep)
        FILE *df;
        struct dumpdates *ddatep;
{
        char buf[BUFSIZ];

        recno = 0;
        if ( (fgets(buf, BUFSIZ, df)) != buf)
                return(-1);
        recno++;
        if (makedumpdate(ddatep, buf) < 0)
                msg("Unknown intermediate format in %s, line %d\n",
                        dumpdates, recno);

#ifdef FDEBUG
        msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level,
            ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate));
#endif
        return(0);
}

time_t  unctime();

int
makedumpdate(ddp, buf)
        struct dumpdates *ddp;
        char *buf;
{
        char un_buf[128];

        sscanf(buf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf);
        ddp->dd_ddate = unctime(un_buf);
        if (ddp->dd_ddate < 0)
                return(-1);
        return(0);
}