/* $NetBSD: itime.c,v 1.20 2013/06/15 01:27:19 christos Exp $ */ /*- * Copyright (c) 1980, 1993 * The Regents of the University of California. 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. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. */ #include #ifndef lint #if 0 static char sccsid[] = "@(#)itime.c 8.1 (Berkeley) 6/5/93"; #else __RCSID("$NetBSD: itime.c,v 1.20 2013/06/15 01:27:19 christos Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include "dump.h" struct dumptime { struct dumpdates dt_value; SLIST_ENTRY(dumptime) dt_list; }; SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead); struct dumpdates **ddatev = 0; int nddates = 0; static void dumprecout(FILE *, struct dumpdates *); static int getrecord(FILE *, struct dumpdates *); static int makedumpdate(struct dumpdates *, const char *); static void readdumptimes(FILE *); void initdumptimes(void) { FILE *df; if ((df = fopen(dumpdates, "r")) == NULL) { if (errno != ENOENT) { msg("WARNING: cannot read %s: %s\n", dumpdates, strerror(errno)); return; } /* * 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) { msg("WARNING: cannot create %s: %s\n", dumpdates, strerror(errno)); return; } (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); (void) fclose(df); } static void readdumptimes(FILE *df) { int i; struct dumptime *dtwalk; for (;;) { dtwalk = (struct dumptime *)xcalloc(1, sizeof(struct dumptime)); if (getrecord(df, &(dtwalk->dt_value)) < 0) { free(dtwalk); break; } nddates++; SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list); } /* * arrayify the list, leaving enough room for the additional * record that we may have to add to the ddate structure */ ddatev = (struct dumpdates **) xcalloc((unsigned) (nddates + 1), sizeof(struct dumpdates *)); dtwalk = SLIST_FIRST(&dthead); for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list)) ddatev[i] = &dtwalk->dt_value; } void getdumptime(void) { struct dumpdates *ddp; 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. If we are doing a true incremental, then * we can use any level as a ref point. */ ITITERATE(i, ddp) { if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0) continue; /* trueinc: ostensibly could omit the second clause * since if trueinc is set, we don't care about the level * at all. */ /* if ((!trueinc && (ddp->dd_level >= level)) || (trueinc && (ddp->dd_level > level))) */ if (!trueinc && (ddp->dd_level >= level)) continue; if (ddp->dd_ddate <= iswap32(spcl.c_ddate)) continue; spcl.c_ddate = iswap32(ddp->dd_ddate); lastlevel = ddp->dd_level; } } void putdumptime(void) { FILE *df; struct dumpdates *dtwalk, *dtfound; 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((char *)ddatev); ddatev = 0; nddates = 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 *)xcalloc(1, sizeof (struct dumpdates)); nddates += 1; found: (void) strlcpy(dtwalk->dd_name, fname, sizeof(dtwalk->dd_name)); dtwalk->dd_level = level; dtwalk->dd_ddate = iswap32(spcl.c_date); dtfound = dtwalk; 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(&dtfound->dd_ddate)); } static void dumprecout(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; static int getrecord(FILE *df, struct dumpdates *ddatep) { char tbuf[BUFSIZ]; recno = 0; if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf) return(-1); recno++; if (makedumpdate(ddatep, tbuf) < 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); } static int makedumpdate(struct dumpdates *ddp, const char *tbuf) { char un_buf[128]; (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf); ddp->dd_ddate = unctime(un_buf); if (ddp->dd_ddate < 0) return(-1); return(0); }