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src/usr.sbin/zic/zic.c

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/* $OpenBSD: zic.c,v 1.26 2020/10/13 00:18:46 deraadt Exp $ */
/*
** This file is in the public domain, so clarified as of
** 2006-07-17 by Arthur David Olson.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <time.h>
#include "tzfile.h"
#define TRUE 1
#define FALSE 0
#define TYPE_SIGNED(type) (((type) -1) < 0)
#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
#define GRANDPARENTED "Local time zone must be set--see zic manual page"
#define ZIC_VERSION '2'
typedef int_fast64_t zic_t;
#ifndef ZIC_MAX_ABBR_LEN_WO_WARN
#define ZIC_MAX_ABBR_LEN_WO_WARN 6
#endif /* !defined ZIC_MAX_ABBR_LEN_WO_WARN */
#define MKDIR_UMASK (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
#define OFFSET_STRLEN_MAXIMUM (7 + INT_STRLEN_MAXIMUM(long))
#define RULE_STRLEN_MAXIMUM 8 /* "Mdd.dd.d" */
#define end(cp, n) (memchr((cp), '\0', (n)))
struct rule {
const char *r_filename;
int r_linenum;
const char *r_name;
int r_loyear; /* for example, 1986 */
int r_hiyear; /* for example, 1986 */
int r_lowasnum;
int r_hiwasnum;
int r_month; /* 0..11 */
int r_dycode; /* see below */
int r_dayofmonth;
int r_wday;
long r_tod; /* time from midnight */
int r_todisstd; /* above is standard time if TRUE */
/* or wall clock time if FALSE */
int r_todisgmt; /* above is GMT if TRUE */
/* or local time if FALSE */
long r_stdoff; /* offset from standard time */
const char *r_abbrvar; /* variable part of abbreviation */
int r_todo; /* a rule to do (used in outzone) */
zic_t r_temp; /* used in outzone */
};
/*
** r_dycode r_dayofmonth r_wday
*/
#define DC_DOM 0 /* 1..31 */ /* unused */
#define DC_DOWGEQ 1 /* 1..31 */ /* 0..6 (Sun..Sat) */
#define DC_DOWLEQ 2 /* 1..31 */ /* 0..6 (Sun..Sat) */
struct zone {
const char *z_filename;
int z_linenum;
const char *z_name;
long z_gmtoff;
const char *z_rule;
const char *z_format;
long z_stdoff;
struct rule *z_rules;
int z_nrules;
struct rule z_untilrule;
zic_t z_untiltime;
};
static void addtt(zic_t starttime, int type);
static int addtype(long gmtoff, const char *abbr, int isdst,
int ttisstd, int ttisgmt);
static void leapadd(zic_t t, int positive, int rolling, int count);
static void adjleap(void);
static void associate(void);
static void convert(long val, char *buf);
static void convert64(zic_t val, char *buf);
static void dolink(const char *fromfield, const char *tofield);
static void doabbr(char *abbr, size_t size, const char *format,
const char *letters, int isdst, int doquotes);
static void eat(const char *name, int num);
static void eats(const char *name, int num, const char *rname, int rnum);
static long eitol(int i);
static void error(const char *message);
static char **getfields(char *buf);
static long gethms(const char *string, const char *errstrng, int signable);
static void infile(const char *filename);
static void inleap(char **fields, int nfields);
static void inlink(char **fields, int nfields);
static void inrule(char **fields, int nfields);
static int inzcont(char **fields, int nfields);
static int inzone(char **fields, int nfields);
static int inzsub(char **fields, int nfields, int iscont);
static int is32(zic_t x);
static int itsabbr(const char *abbr, const char *word);
static int itsdir(const char *name);
static int mkdirs(char *filename);
static void newabbr(const char *abbr);
static long oadd(long t1, long t2);
static void outzone(const struct zone *zp, int ntzones);
static void puttzcode(long code, FILE *fp);
static void puttzcode64(zic_t code, FILE *fp);
static int rcomp(const void *leftp, const void *rightp);
static zic_t rpytime(const struct rule *rp, int wantedy);
static void rulesub(struct rule *rp, const char *loyearp, const char *hiyearp,
const char *typep, const char *monthp,
const char *dayp, const char *timep);
static int stringoffset(char *result, size_t size, long offset);
static int stringrule(char *result, size_t size, const struct rule *rp,
long dstoff, long gmtoff);
static void stringzone(char *result, size_t size,
const struct zone *zp, int ntzones);
static void setboundaries(void);
static zic_t tadd(zic_t t1, long t2);
static void usage(void);
static void writezone(const char *name, const char *string);
extern char *__progname;
static int charcnt;
static int errors;
static const char *filename;
static int leapcnt;
static int leapseen;
static int leapminyear;
static int leapmaxyear;
static int linenum;
static int max_abbrvar_len;
static int max_format_len;
static zic_t max_time;
static int max_year;
static zic_t min_time;
static int min_year;
static int noise;
static const char *rfilename;
static int rlinenum;
static int timecnt;
static int typecnt;
/*
** Line codes.
*/
#define LC_RULE 0
#define LC_ZONE 1
#define LC_LINK 2
#define LC_LEAP 3
/*
** Which fields are which on a Zone line.
*/
#define ZF_NAME 1
#define ZF_GMTOFF 2
#define ZF_RULE 3
#define ZF_FORMAT 4
#define ZF_TILYEAR 5
#define ZF_TILMONTH 6
#define ZF_TILDAY 7
#define ZF_TILTIME 8
#define ZONE_MINFIELDS 5
#define ZONE_MAXFIELDS 9
/*
** Which fields are which on a Zone continuation line.
*/
#define ZFC_GMTOFF 0
#define ZFC_RULE 1
#define ZFC_FORMAT 2
#define ZFC_TILYEAR 3
#define ZFC_TILMONTH 4
#define ZFC_TILDAY 5
#define ZFC_TILTIME 6
#define ZONEC_MINFIELDS 3
#define ZONEC_MAXFIELDS 7
/*
** Which files are which on a Rule line.
*/
#define RF_NAME 1
#define RF_LOYEAR 2
#define RF_HIYEAR 3
#define RF_COMMAND 4
#define RF_MONTH 5
#define RF_DAY 6
#define RF_TOD 7
#define RF_STDOFF 8
#define RF_ABBRVAR 9
#define RULE_FIELDS 10
/*
** Which fields are which on a Link line.
*/
#define LF_FROM 1
#define LF_TO 2
#define LINK_FIELDS 3
/*
** Which fields are which on a Leap line.
*/
#define LP_YEAR 1
#define LP_MONTH 2
#define LP_DAY 3
#define LP_TIME 4
#define LP_CORR 5
#define LP_ROLL 6
#define LEAP_FIELDS 7
/*
** Year synonyms.
*/
#define YR_MINIMUM 0
#define YR_MAXIMUM 1
#define YR_ONLY 2
static struct rule *rules;
static int nrules; /* number of rules */
static struct zone *zones;
static int nzones; /* number of zones */
struct link {
const char *l_filename;
int l_linenum;
const char *l_from;
const char *l_to;
};
static struct link *links;
static int nlinks;
struct lookup {
const char *l_word;
const int l_value;
};
static struct lookup const *byword(const char *string, const struct lookup *lp);
static struct lookup const line_codes[] = {
{ "Rule", LC_RULE },
{ "Zone", LC_ZONE },
{ "Link", LC_LINK },
{ "Leap", LC_LEAP },
{ NULL, 0}
};
static struct lookup const mon_names[] = {
{ "January", TM_JANUARY },
{ "February", TM_FEBRUARY },
{ "March", TM_MARCH },
{ "April", TM_APRIL },
{ "May", TM_MAY },
{ "June", TM_JUNE },
{ "July", TM_JULY },
{ "August", TM_AUGUST },
{ "September", TM_SEPTEMBER },
{ "October", TM_OCTOBER },
{ "November", TM_NOVEMBER },
{ "December", TM_DECEMBER },
{ NULL, 0 }
};
static struct lookup const wday_names[] = {
{ "Sunday", TM_SUNDAY },
{ "Monday", TM_MONDAY },
{ "Tuesday", TM_TUESDAY },
{ "Wednesday", TM_WEDNESDAY },
{ "Thursday", TM_THURSDAY },
{ "Friday", TM_FRIDAY },
{ "Saturday", TM_SATURDAY },
{ NULL, 0 }
};
static struct lookup const lasts[] = {
{ "last-Sunday", TM_SUNDAY },
{ "last-Monday", TM_MONDAY },
{ "last-Tuesday", TM_TUESDAY },
{ "last-Wednesday", TM_WEDNESDAY },
{ "last-Thursday", TM_THURSDAY },
{ "last-Friday", TM_FRIDAY },
{ "last-Saturday", TM_SATURDAY },
{ NULL, 0 }
};
static struct lookup const begin_years[] = {
{ "minimum", YR_MINIMUM },
{ "maximum", YR_MAXIMUM },
{ NULL, 0 }
};
static struct lookup const end_years[] = {
{ "minimum", YR_MINIMUM },
{ "maximum", YR_MAXIMUM },
{ "only", YR_ONLY },
{ NULL, 0 }
};
static struct lookup const leap_types[] = {
{ "Rolling", TRUE },
{ "Stationary", FALSE },
{ NULL, 0 }
};
static const int len_months[2][MONSPERYEAR] = {
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
static const int len_years[2] = {
DAYSPERNYEAR, DAYSPERLYEAR
};
static struct attype {
zic_t at;
unsigned char type;
} attypes[TZ_MAX_TIMES];
static long gmtoffs[TZ_MAX_TYPES];
static char isdsts[TZ_MAX_TYPES];
static unsigned char abbrinds[TZ_MAX_TYPES];
static char ttisstds[TZ_MAX_TYPES];
static char ttisgmts[TZ_MAX_TYPES];
static char chars[TZ_MAX_CHARS];
static zic_t trans[TZ_MAX_LEAPS];
static long corr[TZ_MAX_LEAPS];
static char roll[TZ_MAX_LEAPS];
/*
** Memory allocation.
*/
static void *
memcheck(void *ptr)
{
if (ptr == NULL)
err(1, "Memory exhausted");
return ptr;
}
static char *
ecatalloc(char *start, const char *tail)
{
size_t len;
char *str;
len = strlen(start) + strlen(tail) + 1;
str = memcheck(realloc(start, len));
strlcat(str, tail, len);
return str;
}
#define emalloc(size) memcheck(malloc(size))
#define ereallocarray(ptr, nmemb, size) memcheck(reallocarray(ptr, nmemb, size))
#define erealloc(ptr, size) memcheck(realloc((ptr), (size)))
#define ecpyalloc(ptr) memcheck(strdup(ptr))
/*
** Error handling.
*/
static void
eats(const char *name, int num, const char *rname, int rnum)
{
filename = name;
linenum = num;
rfilename = rname;
rlinenum = rnum;
}
static void
eat(const char *name, int num)
{
eats(name, num, NULL, -1);
}
static void
error(const char *string)
{
/*
** Match the format of "cc" to allow sh users to
** zic ... 2>&1 | error -t "*" -v
** on BSD systems.
*/
fprintf(stderr, "\"%s\", line %d: %s",
filename, linenum, string);
if (rfilename != NULL)
fprintf(stderr, " (rule from \"%s\", line %d)",
rfilename, rlinenum);
fprintf(stderr, "\n");
++errors;
}
static void
warning(const char *string)
{
char *cp;
cp = ecpyalloc("warning: ");
cp = ecatalloc(cp, string);
error(cp);
free(cp);
--errors;
}
static const char *
scheck(const char *string, const char *format)
{
const char *fp, *result;
char *fbuf, *tp, dummy;
int c;
result = "";
if (string == NULL || format == NULL)
return result;
fbuf = reallocarray(NULL, strlen(format) + 2, 2);
if (fbuf == NULL)
return result;
fp = format;
tp = fbuf;
while ((*tp++ = c = *fp++) != '\0') {
if (c != '%')
continue;
if (*fp == '%') {
*tp++ = *fp++;
continue;
}
*tp++ = '*';
if (*fp == '*')
++fp;
while (isdigit((unsigned char)*fp))
*tp++ = *fp++;
if (*fp == 'l' || *fp == 'h')
*tp++ = *fp++;
else if (*fp == '[')
do {
*tp++ = *fp++;
} while (*fp != '\0' && *fp != ']');
if ((*tp++ = *fp++) == '\0')
break;
}
*(tp - 1) = '%';
*tp++ = 'c';
*tp = '\0';
if (sscanf(string, fbuf, &dummy) != 1)
result = format;
free(fbuf);
return result;
}
static void
usage(void)
{
fprintf(stderr,
"usage: %s [-v] [-d directory] [-L leapsecondfilename] [-l timezone]\n"
"\t\t[-p timezone] [filename ...]\n",
__progname);
exit(EXIT_FAILURE);
}
static const char *psxrules;
static const char *lcltime;
static const char *directory;
static const char *leapsec;
int
main(int argc, char **argv)
{
int i, j, c;
if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1)
err(1, "pledge");
umask(umask(S_IWGRP | S_IWOTH) | (S_IWGRP | S_IWOTH));
while ((c = getopt(argc, argv, "d:l:p:L:vy:")) != -1)
switch (c) {
default:
usage();
case 'd':
if (directory == NULL)
directory = optarg;
else
errx(1, "More than one -d option specified");
break;
case 'l':
if (lcltime == NULL)
lcltime = optarg;
else
errx(1, "More than one -l option specified");
break;
case 'p':
if (psxrules == NULL)
psxrules = optarg;
else
errx(1, "More than one -p option specified");
break;
case 'y':
warning("ignoring obsolescent option -y");
break;
case 'L':
if (leapsec == NULL)
leapsec = optarg;
else
errx(1, "More than one -L option specified");
break;
case 'v':
noise = TRUE;
break;
}
if (optind == argc - 1 && strcmp(argv[optind], "=") == 0)
usage(); /* usage message by request */
if (directory == NULL)
directory = TZDIR;
setboundaries();
if (optind < argc && leapsec != NULL) {
infile(leapsec);
adjleap();
}
for (i = optind; i < argc; ++i)
infile(argv[i]);
if (errors)
exit(EXIT_FAILURE);
associate();
for (i = 0; i < nzones; i = j) {
/*
** Find the next non-continuation zone entry.
*/
for (j = i + 1; j < nzones && zones[j].z_name == NULL; ++j)
continue;
outzone(&zones[i], j - i);
}
/*
** Make links.
*/
for (i = 0; i < nlinks; ++i) {
eat(links[i].l_filename, links[i].l_linenum);
dolink(links[i].l_from, links[i].l_to);
if (noise)
for (j = 0; j < nlinks; ++j)
if (strcmp(links[i].l_to,
links[j].l_from) == 0)
warning("link to link");
}
if (lcltime != NULL) {
eat("command line", 1);
dolink(lcltime, TZDEFAULT);
}
if (psxrules != NULL) {
eat("command line", 1);
dolink(psxrules, TZDEFRULES);
}
return (errors == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}
static void
dolink(const char *fromfield, const char *tofield)
{
char *fromname, *toname;
if (fromfield[0] == '/')
fromname = ecpyalloc(fromfield);
else {
fromname = ecpyalloc(directory);
fromname = ecatalloc(fromname, "/");
fromname = ecatalloc(fromname, fromfield);
}
if (tofield[0] == '/')
toname = ecpyalloc(tofield);
else {
toname = ecpyalloc(directory);
toname = ecatalloc(toname, "/");
toname = ecatalloc(toname, tofield);
}
/*
** We get to be careful here since
** there's a fair chance of root running us.
*/
if (!itsdir(toname))
remove(toname);
if (link(fromname, toname) != 0) {
int result;
if (mkdirs(toname) != 0)
exit(EXIT_FAILURE);
result = link(fromname, toname);
if (result != 0 && errno == EXDEV)
result = symlink(fromname, toname);
if (result != 0)
err(1, "Can't link from %s to %s", fromname, toname);
}
free(fromname);
free(toname);
}
#define TIME_T_BITS_IN_FILE 64
static void
setboundaries(void)
{
int i;
min_time = -1;
for (i = 0; i < TIME_T_BITS_IN_FILE - 1; ++i)
min_time *= 2;
max_time = -(min_time + 1);
}
static int
itsdir(const char *name)
{
char *myname;
int accres;
myname = ecpyalloc(name);
myname = ecatalloc(myname, "/.");
accres = access(myname, F_OK);
free(myname);
return accres == 0;
}
/*
** Associate sets of rules with zones.
*/
/*
** Sort by rule name.
*/
static int
rcomp(const void *cp1, const void *cp2)
{
return strcmp(((const struct rule *) cp1)->r_name,
((const struct rule *) cp2)->r_name);
}
static void
associate(void)
{
struct zone *zp;
struct rule *rp;
int base, out, i, j;
if (nrules != 0) {
qsort(rules, nrules, sizeof *rules, rcomp);
for (i = 0; i < nrules - 1; ++i) {
if (strcmp(rules[i].r_name,
rules[i + 1].r_name) != 0)
continue;
if (strcmp(rules[i].r_filename,
rules[i + 1].r_filename) == 0)
continue;
eat(rules[i].r_filename, rules[i].r_linenum);
warning("same rule name in multiple files");
eat(rules[i + 1].r_filename, rules[i + 1].r_linenum);
warning("same rule name in multiple files");
for (j = i + 2; j < nrules; ++j) {
if (strcmp(rules[i].r_name,
rules[j].r_name) != 0)
break;
if (strcmp(rules[i].r_filename,
rules[j].r_filename) == 0)
continue;
if (strcmp(rules[i + 1].r_filename,
rules[j].r_filename) == 0)
continue;
break;
}
i = j - 1;
}
}
for (i = 0; i < nzones; ++i) {
zp = &zones[i];
zp->z_rules = NULL;
zp->z_nrules = 0;
}
for (base = 0; base < nrules; base = out) {
rp = &rules[base];
for (out = base + 1; out < nrules; ++out)
if (strcmp(rp->r_name, rules[out].r_name) != 0)
break;
for (i = 0; i < nzones; ++i) {
zp = &zones[i];
if (strcmp(zp->z_rule, rp->r_name) != 0)
continue;
zp->z_rules = rp;
zp->z_nrules = out - base;
}
}
for (i = 0; i < nzones; ++i) {
zp = &zones[i];
if (zp->z_nrules == 0) {
/*
** Maybe we have a local standard time offset.
*/
eat(zp->z_filename, zp->z_linenum);
zp->z_stdoff = gethms(zp->z_rule, "unruly zone",
TRUE);
/*
** Note, though, that if there's no rule,
** a '%s' in the format is a bad thing.
*/
if (strchr(zp->z_format, '%') != 0)
error("%s in ruleless zone");
}
}
if (errors)
exit(EXIT_FAILURE);
}
static void
infile(const char *name)
{
FILE *fp;
char **fields, *cp;
const struct lookup *lp;
int nfields, wantcont, num;
char buf[BUFSIZ];
if (strcmp(name, "-") == 0) {
name = "standard input";
fp = stdin;
} else if ((fp = fopen(name, "r")) == NULL)
err(1, "Can't open %s", name);
wantcont = FALSE;
for (num = 1; ; ++num) {
eat(name, num);
if (fgets(buf, sizeof buf, fp) != buf)
break;
cp = strchr(buf, '\n');
if (cp == NULL) {
error("line too long");
exit(EXIT_FAILURE);
}
*cp = '\0';
fields = getfields(buf);
nfields = 0;
while (fields[nfields] != NULL) {
static char nada;
if (strcmp(fields[nfields], "-") == 0)
fields[nfields] = &nada;
++nfields;
}
if (nfields == 0) {
/* nothing to do */
} else if (wantcont) {
wantcont = inzcont(fields, nfields);
} else {
lp = byword(fields[0], line_codes);
if (lp == NULL)
error("input line of unknown type");
else switch ((int) (lp->l_value)) {
case LC_RULE:
inrule(fields, nfields);
wantcont = FALSE;
break;
case LC_ZONE:
wantcont = inzone(fields, nfields);
break;
case LC_LINK:
inlink(fields, nfields);
wantcont = FALSE;
break;
case LC_LEAP:
if (name != leapsec)
fprintf(stderr,
"%s: Leap line in non leap seconds file %s\n",
__progname, name);
/* no exit? */
else
inleap(fields, nfields);
wantcont = FALSE;
break;
default: /* "cannot happen" */
errx(1, "panic: Invalid l_value %d", lp->l_value);
}
}
free(fields);
}
if (ferror(fp))
errx(1, "Error reading %s", filename);
if (fp != stdin && fclose(fp))
err(1, "Error closing %s", filename);
if (wantcont)
error("expected continuation line not found");
}
/*
** Convert a string of one of the forms
** h -h hh:mm -hh:mm hh:mm:ss -hh:mm:ss
** into a number of seconds.
** A null string maps to zero.
** Call error with errstring and return zero on errors.
*/
static long
gethms(const char *string, const char *errstring, int signable)
{
long hh;
int mm, ss, sign;
if (string == NULL || *string == '\0')
return 0;
if (!signable)
sign = 1;
else if (*string == '-') {
sign = -1;
++string;
} else
sign = 1;
if (sscanf(string, scheck(string, "%ld"), &hh) == 1)
mm = ss = 0;
else if (sscanf(string, scheck(string, "%ld:%d"), &hh, &mm) == 2)
ss = 0;
else if (sscanf(string, scheck(string, "%ld:%d:%d"),
&hh, &mm, &ss) != 3) {
error(errstring);
return 0;
}
if (hh < 0 ||
mm < 0 || mm >= MINSPERHOUR ||
ss < 0 || ss > SECSPERMIN) {
error(errstring);
return 0;
}
if (LONG_MAX / SECSPERHOUR < hh) {
error("time overflow");
return 0;
}
return oadd(eitol(sign) * hh * eitol(SECSPERHOUR),
eitol(sign) * (eitol(mm) * eitol(SECSPERMIN) + eitol(ss)));
}
static void
inrule(char **fields, int nfields)
{
static struct rule r;
if (nfields != RULE_FIELDS) {
error("wrong number of fields on Rule line");
return;
}
if (*fields[RF_NAME] == '\0') {
error("nameless rule");
return;
}
r.r_filename = filename;
r.r_linenum = linenum;
r.r_stdoff = gethms(fields[RF_STDOFF], "invalid saved time", TRUE);
rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
r.r_name = ecpyalloc(fields[RF_NAME]);
r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
if (max_abbrvar_len < strlen(r.r_abbrvar))
max_abbrvar_len = strlen(r.r_abbrvar);
rules = ereallocarray(rules, nrules + 1, sizeof *rules);
rules[nrules++] = r;
}
static int
inzone(char **fields, int nfields)
{
int i;
static char *buf;
size_t len;
if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
error("wrong number of fields on Zone line");
return FALSE;
}
if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
len = 132 + strlen(TZDEFAULT);
buf = erealloc(buf, len);
snprintf(buf, len,
"\"Zone %s\" line and -l option are mutually exclusive",
TZDEFAULT);
error(buf);
return FALSE;
}
if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
len = 132 + strlen(TZDEFRULES);
buf = erealloc(buf, len);
snprintf(buf, len,
"\"Zone %s\" line and -p option are mutually exclusive",
TZDEFRULES);
error(buf);
return FALSE;
}
for (i = 0; i < nzones; ++i)
if (zones[i].z_name != NULL &&
strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
len = 132 + strlen(fields[ZF_NAME]) +
strlen(zones[i].z_filename);
buf = erealloc(buf, len);
snprintf(buf, len,
"duplicate zone name %s (file \"%s\", line %d)",
fields[ZF_NAME],
zones[i].z_filename,
zones[i].z_linenum);
error(buf);
return FALSE;
}
return inzsub(fields, nfields, FALSE);
}
static int
inzcont(char **fields, int nfields)
{
if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
error("wrong number of fields on Zone continuation line");
return FALSE;
}
return inzsub(fields, nfields, TRUE);
}
static int
inzsub(char **fields, int nfields, int iscont)
{
char *cp;
static struct zone z;
int i_gmtoff, i_rule, i_format;
int i_untilyear, i_untilmonth;
int i_untilday, i_untiltime;
int hasuntil;
if (iscont) {
i_gmtoff = ZFC_GMTOFF;
i_rule = ZFC_RULE;
i_format = ZFC_FORMAT;
i_untilyear = ZFC_TILYEAR;
i_untilmonth = ZFC_TILMONTH;
i_untilday = ZFC_TILDAY;
i_untiltime = ZFC_TILTIME;
z.z_name = NULL;
} else {
i_gmtoff = ZF_GMTOFF;
i_rule = ZF_RULE;
i_format = ZF_FORMAT;
i_untilyear = ZF_TILYEAR;
i_untilmonth = ZF_TILMONTH;
i_untilday = ZF_TILDAY;
i_untiltime = ZF_TILTIME;
z.z_name = ecpyalloc(fields[ZF_NAME]);
}
z.z_filename = filename;
z.z_linenum = linenum;
z.z_gmtoff = gethms(fields[i_gmtoff], "invalid UTC offset", TRUE);
if ((cp = strchr(fields[i_format], '%')) != 0) {
if (*++cp != 's' || strchr(cp, '%') != 0) {
error("invalid abbreviation format");
return FALSE;
}
}
z.z_rule = ecpyalloc(fields[i_rule]);
z.z_format = ecpyalloc(fields[i_format]);
if (max_format_len < strlen(z.z_format))
max_format_len = strlen(z.z_format);
hasuntil = nfields > i_untilyear;
if (hasuntil) {
z.z_untilrule.r_filename = filename;
z.z_untilrule.r_linenum = linenum;
rulesub(&z.z_untilrule,
fields[i_untilyear],
"only",
"",
(nfields > i_untilmonth) ?
fields[i_untilmonth] : "Jan",
(nfields > i_untilday) ? fields[i_untilday] : "1",
(nfields > i_untiltime) ? fields[i_untiltime] : "0");
z.z_untiltime = rpytime(&z.z_untilrule,
z.z_untilrule.r_loyear);
if (iscont && nzones > 0 &&
z.z_untiltime > min_time &&
z.z_untiltime < max_time &&
zones[nzones - 1].z_untiltime > min_time &&
zones[nzones - 1].z_untiltime < max_time &&
zones[nzones - 1].z_untiltime >= z.z_untiltime) {
error("Zone continuation line end time is not after end time of previous line");
return FALSE;
}
}
zones = ereallocarray(zones, nzones + 1, sizeof *zones);
zones[nzones++] = z;
/*
** If there was an UNTIL field on this line,
** there's more information about the zone on the next line.
*/
return hasuntil;
}
static void
inleap(char **fields, int nfields)
{
const char *cp;
const struct lookup *lp;
int i, j;
int year, month, day;
long dayoff, tod;
zic_t t;
if (nfields != LEAP_FIELDS) {
error("wrong number of fields on Leap line");
return;
}
dayoff = 0;
cp = fields[LP_YEAR];
if (sscanf(cp, scheck(cp, "%d"), &year) != 1) {
/*
** Leapin' Lizards!
*/
error("invalid leaping year");
return;
}
if (!leapseen || leapmaxyear < year)
leapmaxyear = year;
if (!leapseen || leapminyear > year)
leapminyear = year;
leapseen = TRUE;
j = EPOCH_YEAR;
while (j != year) {
if (year > j) {
i = len_years[isleap(j)];
++j;
} else {
--j;
i = -len_years[isleap(j)];
}
dayoff = oadd(dayoff, eitol(i));
}
if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
error("invalid month name");
return;
}
month = lp->l_value;
j = TM_JANUARY;
while (j != month) {
i = len_months[isleap(year)][j];
dayoff = oadd(dayoff, eitol(i));
++j;
}
cp = fields[LP_DAY];
if (sscanf(cp, scheck(cp, "%d"), &day) != 1 ||
day <= 0 || day > len_months[isleap(year)][month]) {
error("invalid day of month");
return;
}
dayoff = oadd(dayoff, eitol(day - 1));
if (dayoff < 0 && !TYPE_SIGNED(zic_t)) {
error("time before zero");
return;
}
if (dayoff < min_time / SECSPERDAY) {
error("time too small");
return;
}
if (dayoff > max_time / SECSPERDAY) {
error("time too large");
return;
}
t = (zic_t) dayoff * SECSPERDAY;
tod = gethms(fields[LP_TIME], "invalid time of day", FALSE);
cp = fields[LP_CORR];
{
int positive;
int count;
if (strcmp(cp, "") == 0) { /* infile() turns "-" into "" */
positive = FALSE;
count = 1;
} else if (strcmp(cp, "--") == 0) {
positive = FALSE;
count = 2;
} else if (strcmp(cp, "+") == 0) {
positive = TRUE;
count = 1;
} else if (strcmp(cp, "++") == 0) {
positive = TRUE;
count = 2;
} else {
error("illegal CORRECTION field on Leap line");
return;
}
if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
error("illegal Rolling/Stationary field on Leap line");
return;
}
leapadd(tadd(t, tod), positive, lp->l_value, count);
}
}
static void
inlink(char **fields, int nfields)
{
struct link l;
if (nfields != LINK_FIELDS) {
error("wrong number of fields on Link line");
return;
}
if (*fields[LF_FROM] == '\0') {
error("blank FROM field on Link line");
return;
}
if (*fields[LF_TO] == '\0') {
error("blank TO field on Link line");
return;
}
l.l_filename = filename;
l.l_linenum = linenum;
l.l_from = ecpyalloc(fields[LF_FROM]);
l.l_to = ecpyalloc(fields[LF_TO]);
links = ereallocarray(links, nlinks + 1, sizeof *links);
links[nlinks++] = l;
}
static void
rulesub(struct rule * const rp, const char * const loyearp,
const char * const hiyearp, const char * const typep,
const char * const monthp, const char * const dayp,
const char * const timep)
{
const struct lookup *lp;
const char *cp;
char *dp, *ep;
if ((lp = byword(monthp, mon_names)) == NULL) {
error("invalid month name");
return;
}
rp->r_month = lp->l_value;
rp->r_todisstd = FALSE;
rp->r_todisgmt = FALSE;
dp = ecpyalloc(timep);
if (*dp != '\0') {
ep = dp + strlen(dp) - 1;
switch (tolower((unsigned char)*ep)) {
case 's': /* Standard */
rp->r_todisstd = TRUE;
rp->r_todisgmt = FALSE;
*ep = '\0';
break;
case 'w': /* Wall */
rp->r_todisstd = FALSE;
rp->r_todisgmt = FALSE;
*ep = '\0';
break;
case 'g': /* Greenwich */
case 'u': /* Universal */
case 'z': /* Zulu */
rp->r_todisstd = TRUE;
rp->r_todisgmt = TRUE;
*ep = '\0';
break;
}
}
rp->r_tod = gethms(dp, "invalid time of day", FALSE);
free(dp);
/*
** Year work.
*/
cp = loyearp;
lp = byword(cp, begin_years);
rp->r_lowasnum = lp == NULL;
if (!rp->r_lowasnum) switch ((int) lp->l_value) {
case YR_MINIMUM:
rp->r_loyear = INT_MIN;
break;
case YR_MAXIMUM:
rp->r_loyear = INT_MAX;
break;
default: /* "cannot happen" */
errx(1, "panic: Invalid l_value %d", lp->l_value);
} else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1) {
error("invalid starting year");
return;
}
cp = hiyearp;
lp = byword(cp, end_years);
rp->r_hiwasnum = lp == NULL;
if (!rp->r_hiwasnum) switch ((int) lp->l_value) {
case YR_MINIMUM:
rp->r_hiyear = INT_MIN;
break;
case YR_MAXIMUM:
rp->r_hiyear = INT_MAX;
break;
case YR_ONLY:
rp->r_hiyear = rp->r_loyear;
break;
default: /* "cannot happen" */
errx(1, "panic: Invalid l_value %d", lp->l_value);
} else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1) {
error("invalid ending year");
return;
}
if (rp->r_loyear > rp->r_hiyear) {
error("starting year greater than ending year");
return;
}
if (*typep != '\0') {
if (rp->r_loyear == rp->r_hiyear) {
error("typed single year");
return;
}
warning("year type is obsolete; use \"-\" instead");
}
/*
** Day work.
** Accept things such as:
** 1
** last-Sunday
** Sun<=20
** Sun>=7
*/
dp = ecpyalloc(dayp);
if ((lp = byword(dp, lasts)) != NULL) {
rp->r_dycode = DC_DOWLEQ;
rp->r_wday = lp->l_value;
rp->r_dayofmonth = len_months[1][rp->r_month];
} else {
if ((ep = strchr(dp, '<')) != 0)
rp->r_dycode = DC_DOWLEQ;
else if ((ep = strchr(dp, '>')) != 0)
rp->r_dycode = DC_DOWGEQ;
else {
ep = dp;
rp->r_dycode = DC_DOM;
}
if (rp->r_dycode != DC_DOM) {
*ep++ = 0;
if (*ep++ != '=') {
error("invalid day of month");
free(dp);
return;
}
if ((lp = byword(dp, wday_names)) == NULL) {
error("invalid weekday name");
free(dp);
return;
}
rp->r_wday = lp->l_value;
}
if (sscanf(ep, scheck(ep, "%d"), &rp->r_dayofmonth) != 1 ||
rp->r_dayofmonth <= 0 ||
(rp->r_dayofmonth > len_months[1][rp->r_month])) {
error("invalid day of month");
free(dp);
return;
}
}
free(dp);
}
static void
convert(long val, char *buf)
{
int i;
int shift;
for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
buf[i] = val >> shift;
}
static void
convert64(zic_t val, char *buf)
{
int i;
int shift;
for (i = 0, shift = 56; i < 8; ++i, shift -= 8)
buf[i] = val >> shift;
}
static void
puttzcode(long val, FILE *fp)
{
char buf[4];
convert(val, buf);
fwrite(buf, sizeof buf, 1, fp);
}
static void
puttzcode64(zic_t val, FILE *fp)
{
char buf[8];
convert64(val, buf);
fwrite(buf, sizeof buf, 1, fp);
}
static int
atcomp(const void *avp, const void *bvp)
{
const zic_t a = ((const struct attype *) avp)->at;
const zic_t b = ((const struct attype *) bvp)->at;
return (a < b) ? -1 : (a > b);
}
static int
is32(zic_t x)
{
return INT32_MIN <= x && x <= INT32_MAX;
}
static void
writezone(const char *name, const char *string)
{
FILE *fp;
int i, j;
int leapcnt32, leapi32;
int timecnt32, timei32;
int pass;
static char *fullname;
static const struct tzhead tzh0;
static struct tzhead tzh;
zic_t ats[TZ_MAX_TIMES];
unsigned char types[TZ_MAX_TIMES];
size_t len;
/*
** Sort.
*/
if (timecnt > 1)
qsort(attypes, timecnt, sizeof *attypes, atcomp);
/*
** Optimize.
*/
{
int fromi;
int toi;
toi = 0;
fromi = 0;
while (fromi < timecnt && attypes[fromi].at < min_time)
++fromi;
if (isdsts[0] == 0)
while (fromi < timecnt && attypes[fromi].type == 0)
++fromi; /* handled by default rule */
for ( ; fromi < timecnt; ++fromi) {
if (toi != 0 && ((attypes[fromi].at +
gmtoffs[attypes[toi - 1].type]) <=
(attypes[toi - 1].at + gmtoffs[toi == 1 ? 0 :
attypes[toi - 2].type]))) {
attypes[toi - 1].type = attypes[fromi].type;
continue;
}
if (toi == 0 ||
attypes[toi - 1].type != attypes[fromi].type)
attypes[toi++] = attypes[fromi];
}
timecnt = toi;
}
/*
** Transfer.
*/
for (i = 0; i < timecnt; ++i) {
ats[i] = attypes[i].at;
types[i] = attypes[i].type;
}
/*
** Correct for leap seconds.
*/
for (i = 0; i < timecnt; ++i) {
j = leapcnt;
while (--j >= 0)
if (ats[i] > trans[j] - corr[j]) {
ats[i] = tadd(ats[i], corr[j]);
break;
}
}
/*
** Figure out 32-bit-limited starts and counts.
*/
timecnt32 = timecnt;
timei32 = 0;
leapcnt32 = leapcnt;
leapi32 = 0;
while (timecnt32 > 0 && !is32(ats[timecnt32 - 1]))
--timecnt32;
while (timecnt32 > 0 && !is32(ats[timei32])) {
--timecnt32;
++timei32;
}
while (leapcnt32 > 0 && !is32(trans[leapcnt32 - 1]))
--leapcnt32;
while (leapcnt32 > 0 && !is32(trans[leapi32])) {
--leapcnt32;
++leapi32;
}
len = strlen(directory) + 1 + strlen(name) + 1;
fullname = erealloc(fullname, len);
snprintf(fullname, len, "%s/%s", directory, name);
/*
** Remove old file, if any, to snap links.
*/
if (!itsdir(fullname) && remove(fullname) != 0 && errno != ENOENT)
err(1, "Can't remove %s", fullname);
if ((fp = fopen(fullname, "wb")) == NULL) {
if (mkdirs(fullname) != 0)
exit(EXIT_FAILURE);
if ((fp = fopen(fullname, "wb")) == NULL)
err(1, "Can't create %s", fullname);
}
for (pass = 1; pass <= 2; ++pass) {
int thistimei, thistimecnt;
int thisleapi, thisleapcnt;
int thistimelim, thisleaplim;
int writetype[TZ_MAX_TIMES];
int typemap[TZ_MAX_TYPES];
int thistypecnt;
char thischars[TZ_MAX_CHARS];
char thischarcnt;
int indmap[TZ_MAX_CHARS];
if (pass == 1) {
thistimei = timei32;
thistimecnt = timecnt32;
thisleapi = leapi32;
thisleapcnt = leapcnt32;
} else {
thistimei = 0;
thistimecnt = timecnt;
thisleapi = 0;
thisleapcnt = leapcnt;
}
thistimelim = thistimei + thistimecnt;
thisleaplim = thisleapi + thisleapcnt;
for (i = 0; i < typecnt; ++i)
writetype[i] = thistimecnt == timecnt;
if (thistimecnt == 0) {
/*
** No transition times fall in the current
** (32- or 64-bit) window.
*/
if (typecnt != 0)
writetype[typecnt - 1] = TRUE;
} else {
for (i = thistimei - 1; i < thistimelim; ++i)
if (i >= 0)
writetype[types[i]] = TRUE;
/*
** For America/Godthab and Antarctica/Palmer
*/
if (thistimei == 0)
writetype[0] = TRUE;
}
#ifndef LEAVE_SOME_PRE_2011_SYSTEMS_IN_THE_LURCH
/*
** For some pre-2011 systems: if the last-to-be-written
** standard (or daylight) type has an offset different from the
** most recently used offset,
** append an (unused) copy of the most recently used type
** (to help get global "altzone" and "timezone" variables
** set correctly).
*/
{
int mrudst, mrustd, hidst, histd, type;
hidst = histd = mrudst = mrustd = -1;
for (i = thistimei; i < thistimelim; ++i)
if (isdsts[types[i]])
mrudst = types[i];
else
mrustd = types[i];
for (i = 0; i < typecnt; ++i)
if (writetype[i]) {
if (isdsts[i])
hidst = i;
else
histd = i;
}
if (hidst >= 0 && mrudst >= 0 && hidst != mrudst &&
gmtoffs[hidst] != gmtoffs[mrudst]) {
isdsts[mrudst] = -1;
type = addtype(gmtoffs[mrudst],
&chars[abbrinds[mrudst]],
TRUE, ttisstds[mrudst],
ttisgmts[mrudst]);
isdsts[mrudst] = TRUE;
writetype[type] = TRUE;
}
if (histd >= 0 && mrustd >= 0 && histd != mrustd &&
gmtoffs[histd] != gmtoffs[mrustd]) {
isdsts[mrustd] = -1;
type = addtype(gmtoffs[mrustd],
&chars[abbrinds[mrustd]],
FALSE, ttisstds[mrustd],
ttisgmts[mrustd]);
isdsts[mrustd] = FALSE;
writetype[type] = TRUE;
}
}
#endif /* !defined LEAVE_SOME_PRE_2011_SYSTEMS_IN_THE_LURCH */
thistypecnt = 0;
for (i = 0; i < typecnt; ++i)
typemap[i] = writetype[i] ? thistypecnt++ : -1;
for (i = 0; i < sizeof indmap / sizeof indmap[0]; ++i)
indmap[i] = -1;
thischarcnt = 0;
for (i = 0; i < typecnt; ++i) {
char *thisabbr;
if (!writetype[i])
continue;
if (indmap[abbrinds[i]] >= 0)
continue;
thisabbr = &chars[abbrinds[i]];
for (j = 0; j < thischarcnt; ++j)
if (strcmp(&thischars[j], thisabbr) == 0)
break;
if (j == thischarcnt) {
strlcpy(&thischars[(int) thischarcnt],
thisabbr, sizeof(thischars) - thischarcnt);
thischarcnt += strlen(thisabbr) + 1;
}
indmap[abbrinds[i]] = j;
}
#define DO(field) fwrite(tzh.field, sizeof tzh.field, 1, fp)
tzh = tzh0;
strncpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic);
tzh.tzh_version[0] = ZIC_VERSION;
convert(eitol(thistypecnt), tzh.tzh_ttisgmtcnt);
convert(eitol(thistypecnt), tzh.tzh_ttisstdcnt);
convert(eitol(thisleapcnt), tzh.tzh_leapcnt);
convert(eitol(thistimecnt), tzh.tzh_timecnt);
convert(eitol(thistypecnt), tzh.tzh_typecnt);
convert(eitol(thischarcnt), tzh.tzh_charcnt);
DO(tzh_magic);
DO(tzh_version);
DO(tzh_reserved);
DO(tzh_ttisgmtcnt);
DO(tzh_ttisstdcnt);
DO(tzh_leapcnt);
DO(tzh_timecnt);
DO(tzh_typecnt);
DO(tzh_charcnt);
#undef DO
for (i = thistimei; i < thistimelim; ++i)
if (pass == 1)
puttzcode((long) ats[i], fp);
else
puttzcode64(ats[i], fp);
for (i = thistimei; i < thistimelim; ++i) {
unsigned char uc;
uc = typemap[types[i]];
fwrite(&uc, sizeof uc, 1, fp);
}
for (i = 0; i < typecnt; ++i)
if (writetype[i]) {
puttzcode(gmtoffs[i], fp);
putc(isdsts[i], fp);
putc((unsigned char)indmap[abbrinds[i]], fp);
}
if (thischarcnt != 0)
fwrite(thischars, sizeof thischars[0], thischarcnt, fp);
for (i = thisleapi; i < thisleaplim; ++i) {
zic_t todo;
if (roll[i]) {
if (timecnt == 0 || trans[i] < ats[0]) {
j = 0;
while (isdsts[j])
if (++j >= typecnt) {
j = 0;
break;
}
} else {
j = 1;
while (j < timecnt &&
trans[i] >= ats[j])
++j;
j = types[j - 1];
}
todo = tadd(trans[i], -gmtoffs[j]);
} else
todo = trans[i];
if (pass == 1)
puttzcode((long) todo, fp);
else
puttzcode64(todo, fp);
puttzcode(corr[i], fp);
}
for (i = 0; i < typecnt; ++i)
if (writetype[i])
putc(ttisstds[i], fp);
for (i = 0; i < typecnt; ++i)
if (writetype[i])
putc(ttisgmts[i], fp);
}
fprintf(fp, "\n%s\n", string);
if (ferror(fp) || fclose(fp))
errx(1, "Error writing %s", fullname);
}
static void
doabbr(char *abbr, size_t size, const char *format, const char *letters,
int isdst, int doquotes)
{
char *cp, *slashp;
int len;
slashp = strchr(format, '/');
if (slashp == NULL) {
if (letters == NULL)
strlcpy(abbr, format, size);
else
snprintf(abbr, size, format, letters);
} else if (isdst) {
strlcpy(abbr, slashp + 1, size);
} else {
if (slashp - format + 1 < size)
size = slashp - format + 1;
strlcpy(abbr, format, size);
}
if (!doquotes)
return;
for (cp = abbr; *cp != '\0'; ++cp)
if (strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZ", *cp) == NULL &&
strchr("abcdefghijklmnopqrstuvwxyz", *cp) == NULL)
break;
len = strlen(abbr);
if (len > 0 && *cp == '\0')
return;
abbr[len + 2] = '\0';
abbr[len + 1] = '>';
for ( ; len > 0; --len)
abbr[len] = abbr[len - 1];
abbr[0] = '<';
}
static void
updateminmax(int x)
{
if (min_year > x)
min_year = x;
if (max_year < x)
max_year = x;
}
static int
stringoffset(char *result, size_t size, long offset)
{
int hours, minutes, seconds;
char *ep;
result[0] = '\0';
if (offset < 0) {
strlcpy(result, "-", size);
offset = -offset;
}
seconds = offset % SECSPERMIN;
offset /= SECSPERMIN;
minutes = offset % MINSPERHOUR;
offset /= MINSPERHOUR;
hours = offset;
if (hours >= HOURSPERDAY) {
result[0] = '\0';
return -1;
}
ep = end(result, size);
snprintf(ep, size - (ep - result), "%d", hours);
if (minutes != 0 || seconds != 0) {
ep = end(result, size);
snprintf(ep, size - (ep - result), ":%02d", minutes);
if (seconds != 0) {
ep = end(result, size);
snprintf(ep, size - (ep - result), ":%02d", seconds);
}
}
return 0;
}
static int
stringrule(char *result, size_t size, const struct rule *rp, long dstoff, long gmtoff)
{
long tod;
char *ep;
ep = end(result, size);
size -= ep - result;
result = ep;
if (rp->r_dycode == DC_DOM) {
int month, total;
if (rp->r_dayofmonth == 29 && rp->r_month == TM_FEBRUARY)
return -1;
total = 0;
for (month = 0; month < rp->r_month; ++month)
total += len_months[0][month];
snprintf(result, size, "J%d", total + rp->r_dayofmonth);
} else {
int week;
if (rp->r_dycode == DC_DOWGEQ) {
if ((rp->r_dayofmonth % DAYSPERWEEK) != 1)
return -1;
week = 1 + rp->r_dayofmonth / DAYSPERWEEK;
} else if (rp->r_dycode == DC_DOWLEQ) {
if (rp->r_dayofmonth == len_months[1][rp->r_month])
week = 5;
else {
if ((rp->r_dayofmonth % DAYSPERWEEK) != 0)
return -1;
week = rp->r_dayofmonth / DAYSPERWEEK;
}
} else
return -1; /* "cannot happen" */
snprintf(result, size, "M%d.%d.%d",
rp->r_month + 1, week, rp->r_wday);
}
tod = rp->r_tod;
if (rp->r_todisgmt)
tod += gmtoff;
if (rp->r_todisstd && rp->r_stdoff == 0)
tod += dstoff;
if (tod < 0) {
result[0] = '\0';
return -1;
}
if (tod != 2 * SECSPERMIN * MINSPERHOUR) {
strlcat(result, "/", size);
ep = end(result, size);
if (stringoffset(ep, size - (ep - result), tod) != 0)
return -1;
}
return 0;
}
static void
stringzone(char *result, size_t size, const struct zone *zpfirst, int zonecount)
{
const struct zone *zp;
struct rule *rp, *stdrp, *dstrp;
int i;
const char *abbrvar;
char *ep;
result[0] = '\0';
zp = zpfirst + zonecount - 1;
stdrp = dstrp = NULL;
for (i = 0; i < zp->z_nrules; ++i) {
rp = &zp->z_rules[i];
if (rp->r_hiwasnum || rp->r_hiyear != INT_MAX)
continue;
if (rp->r_stdoff == 0) {
if (stdrp == NULL)
stdrp = rp;
else
return;
} else {
if (dstrp == NULL)
dstrp = rp;
else
return;
}
}
if (stdrp == NULL && dstrp == NULL) {
/*
** There are no rules running through "max".
** Let's find the latest rule.
*/
for (i = 0; i < zp->z_nrules; ++i) {
rp = &zp->z_rules[i];
if (stdrp == NULL || rp->r_hiyear > stdrp->r_hiyear ||
(rp->r_hiyear == stdrp->r_hiyear &&
rp->r_month > stdrp->r_month))
stdrp = rp;
}
if (stdrp != NULL && stdrp->r_stdoff != 0)
return; /* We end up in DST (a POSIX no-no). */
/*
** Horrid special case: if year is 2037,
** presume this is a zone handled on a year-by-year basis;
** do not try to apply a rule to the zone.
*/
if (stdrp != NULL && stdrp->r_hiyear == 2037)
return;
}
if (stdrp == NULL && (zp->z_nrules != 0 || zp->z_stdoff != 0))
return;
abbrvar = (stdrp == NULL) ? "" : stdrp->r_abbrvar;
doabbr(result, size, zp->z_format, abbrvar, FALSE, TRUE);
ep = end(result, size);
if (stringoffset(ep, size - (ep - result), -zp->z_gmtoff) != 0) {
result[0] = '\0';
return;
}
if (dstrp == NULL)
return;
ep = end(result, size);
doabbr(ep, size - (ep - result), zp->z_format, dstrp->r_abbrvar, TRUE, TRUE);
if (dstrp->r_stdoff != SECSPERMIN * MINSPERHOUR) {
ep = end(result, size);
if (stringoffset(ep, size - (ep - result),
-(zp->z_gmtoff + dstrp->r_stdoff)) != 0) {
result[0] = '\0';
return;
}
}
strlcat(result, ",", size);
if (stringrule(result, size, dstrp, dstrp->r_stdoff, zp->z_gmtoff) != 0) {
result[0] = '\0';
return;
}
strlcat(result, ",", size);
if (stringrule(result, size, stdrp, dstrp->r_stdoff, zp->z_gmtoff) != 0) {
result[0] = '\0';
return;
}
}
static void
outzone(const struct zone *zpfirst, int zonecount)
{
const struct zone *zp;
struct rule *rp;
int i, j, usestart, useuntil, type;
zic_t starttime = 0, untiltime = 0;
long gmtoff, stdoff, startoff;
int year, startttisstd = FALSE, startttisgmt = FALSE;
char *startbuf, *ab, *envvar;
int max_abbr_len, max_envvar_len;
int prodstic; /* all rules are min to max */
max_abbr_len = 2 + max_format_len + max_abbrvar_len;
max_envvar_len = 2 * max_abbr_len + 5 * 9;
startbuf = emalloc(max_abbr_len + 1);
ab = emalloc(max_abbr_len + 1);
envvar = emalloc(max_envvar_len + 1);
/*
** Now. . .finally. . .generate some useful data!
*/
timecnt = 0;
typecnt = 0;
charcnt = 0;
prodstic = zonecount == 1;
/*
** Thanks to Earl Chew
** for noting the need to unconditionally initialize startttisstd.
*/
min_year = max_year = EPOCH_YEAR;
if (leapseen) {
updateminmax(leapminyear);
updateminmax(leapmaxyear + (leapmaxyear < INT_MAX));
}
for (i = 0; i < zonecount; ++i) {
zp = &zpfirst[i];
if (i < zonecount - 1)
updateminmax(zp->z_untilrule.r_loyear);
for (j = 0; j < zp->z_nrules; ++j) {
rp = &zp->z_rules[j];
if (rp->r_lowasnum)
updateminmax(rp->r_loyear);
if (rp->r_hiwasnum)
updateminmax(rp->r_hiyear);
if (rp->r_lowasnum || rp->r_hiwasnum)
prodstic = FALSE;
}
}
/*
** Generate lots of data if a rule can't cover all future times.
*/
stringzone(envvar, max_envvar_len + 1, zpfirst, zonecount);
if (noise && envvar[0] == '\0') {
char * wp;
wp = ecpyalloc("no POSIX environment variable for zone");
wp = ecatalloc(wp, " ");
wp = ecatalloc(wp, zpfirst->z_name);
warning(wp);
free(wp);
}
if (envvar[0] == '\0') {
if (min_year >= INT_MIN + YEARSPERREPEAT)
min_year -= YEARSPERREPEAT;
else
min_year = INT_MIN;
if (max_year <= INT_MAX - YEARSPERREPEAT)
max_year += YEARSPERREPEAT;
else
max_year = INT_MAX;
/*
** Regardless of any of the above,
** for a "proDSTic" zone which specifies that its rules
** always have and always will be in effect,
** we only need one cycle to define the zone.
*/
if (prodstic) {
min_year = 1900;
max_year = min_year + YEARSPERREPEAT;
}
}
/*
** For the benefit of older systems,
** generate data from 1900 through 2037.
*/
if (min_year > 1900)
min_year = 1900;
if (max_year < 2037)
max_year = 2037;
for (i = 0; i < zonecount; ++i) {
/*
** A guess that may well be corrected later.
*/
stdoff = 0;
zp = &zpfirst[i];
usestart = i > 0 && (zp - 1)->z_untiltime > min_time;
useuntil = i < (zonecount - 1);
if (useuntil && zp->z_untiltime <= min_time)
continue;
gmtoff = zp->z_gmtoff;
eat(zp->z_filename, zp->z_linenum);
*startbuf = '\0';
startoff = zp->z_gmtoff;
if (zp->z_nrules == 0) {
stdoff = zp->z_stdoff;
doabbr(startbuf, max_abbr_len + 1, zp->z_format,
NULL, stdoff != 0, FALSE);
type = addtype(oadd(zp->z_gmtoff, stdoff),
startbuf, stdoff != 0, startttisstd,
startttisgmt);
if (usestart) {
addtt(starttime, type);
usestart = FALSE;
} else if (stdoff != 0)
addtt(min_time, type);
} else for (year = min_year; year <= max_year; ++year) {
if (useuntil && year > zp->z_untilrule.r_hiyear)
break;
/*
** Mark which rules to do in the current year.
** For those to do, calculate rpytime(rp, year);
*/
for (j = 0; j < zp->z_nrules; ++j) {
rp = &zp->z_rules[j];
eats(zp->z_filename, zp->z_linenum,
rp->r_filename, rp->r_linenum);
rp->r_todo = year >= rp->r_loyear &&
year <= rp->r_hiyear;
if (rp->r_todo)
rp->r_temp = rpytime(rp, year);
}
for ( ; ; ) {
int k;
zic_t jtime, ktime = 0;
long offset;
if (useuntil) {
/*
** Turn untiltime into UTC
** assuming the current gmtoff and
** stdoff values.
*/
untiltime = zp->z_untiltime;
if (!zp->z_untilrule.r_todisgmt)
untiltime = tadd(untiltime,
-gmtoff);
if (!zp->z_untilrule.r_todisstd)
untiltime = tadd(untiltime,
-stdoff);
}
/*
** Find the rule (of those to do, if any)
** that takes effect earliest in the year.
*/
k = -1;
for (j = 0; j < zp->z_nrules; ++j) {
rp = &zp->z_rules[j];
if (!rp->r_todo)
continue;
eats(zp->z_filename, zp->z_linenum,
rp->r_filename, rp->r_linenum);
offset = rp->r_todisgmt ? 0 : gmtoff;
if (!rp->r_todisstd)
offset = oadd(offset, stdoff);
jtime = rp->r_temp;
if (jtime == min_time ||
jtime == max_time)
continue;
jtime = tadd(jtime, -offset);
if (k < 0 || jtime < ktime) {
k = j;
ktime = jtime;
}
}
if (k < 0)
break; /* go on to next year */
rp = &zp->z_rules[k];
rp->r_todo = FALSE;
if (useuntil && ktime >= untiltime)
break;
stdoff = rp->r_stdoff;
if (usestart && ktime == starttime)
usestart = FALSE;
if (usestart) {
if (ktime < starttime) {
startoff = oadd(zp->z_gmtoff,
stdoff);
doabbr(startbuf,
max_abbr_len + 1,
zp->z_format,
rp->r_abbrvar,
rp->r_stdoff != 0,
FALSE);
continue;
}
if (*startbuf == '\0' &&
startoff == oadd(zp->z_gmtoff,
stdoff)) {
doabbr(startbuf,
max_abbr_len + 1,
zp->z_format,
rp->r_abbrvar,
rp->r_stdoff != 0,
FALSE);
}
}
eats(zp->z_filename, zp->z_linenum,
rp->r_filename, rp->r_linenum);
doabbr(ab, max_abbr_len + 1, zp->z_format,
rp->r_abbrvar, rp->r_stdoff != 0, FALSE);
offset = oadd(zp->z_gmtoff, rp->r_stdoff);
type = addtype(offset, ab, rp->r_stdoff != 0,
rp->r_todisstd, rp->r_todisgmt);
addtt(ktime, type);
}
}
if (usestart) {
if (*startbuf == '\0' &&
zp->z_format != NULL &&
strchr(zp->z_format, '%') == NULL &&
strchr(zp->z_format, '/') == NULL)
strlcpy(startbuf, zp->z_format, max_abbr_len + 1);
eat(zp->z_filename, zp->z_linenum);
if (*startbuf == '\0')
error("can't determine time zone abbreviation to use just after until time");
else
addtt(starttime,
addtype(startoff, startbuf,
startoff != zp->z_gmtoff,
startttisstd, startttisgmt));
}
/*
** Now we may get to set starttime for the next zone line.
*/
if (useuntil) {
startttisstd = zp->z_untilrule.r_todisstd;
startttisgmt = zp->z_untilrule.r_todisgmt;
starttime = zp->z_untiltime;
if (!startttisstd)
starttime = tadd(starttime, -stdoff);
if (!startttisgmt)
starttime = tadd(starttime, -gmtoff);
}
}
writezone(zpfirst->z_name, envvar);
free(startbuf);
free(ab);
free(envvar);
}
static void
addtt(const zic_t starttime, int type)
{
size_t len;
if (starttime <= min_time ||
(timecnt == 1 && attypes[0].at < min_time)) {
gmtoffs[0] = gmtoffs[type];
isdsts[0] = isdsts[type];
ttisstds[0] = ttisstds[type];
ttisgmts[0] = ttisgmts[type];
if (abbrinds[type] != 0) {
len = strlen(&chars[abbrinds[type]]) + 1;
memmove(chars, &chars[abbrinds[type]], len);
}
abbrinds[0] = 0;
charcnt = strlen(chars) + 1;
typecnt = 1;
timecnt = 0;
type = 0;
}
if (timecnt >= TZ_MAX_TIMES) {
error("too many transitions?!");
exit(EXIT_FAILURE);
}
attypes[timecnt].at = starttime;
attypes[timecnt].type = type;
++timecnt;
}
static int
addtype(long gmtoff, const char *abbr, int isdst, int ttisstd, int ttisgmt)
{
int i, j;
if (isdst != TRUE && isdst != FALSE) {
error("internal error - addtype called with bad isdst");
exit(EXIT_FAILURE);
}
if (ttisstd != TRUE && ttisstd != FALSE) {
error("internal error - addtype called with bad ttisstd");
exit(EXIT_FAILURE);
}
if (ttisgmt != TRUE && ttisgmt != FALSE) {
error("internal error - addtype called with bad ttisgmt");
exit(EXIT_FAILURE);
}
/*
** See if there's already an entry for this zone type.
** If so, just return its index.
*/
for (i = 0; i < typecnt; ++i) {
if (gmtoff == gmtoffs[i] && isdst == isdsts[i] &&
strcmp(abbr, &chars[abbrinds[i]]) == 0 &&
ttisstd == ttisstds[i] &&
ttisgmt == ttisgmts[i])
return i;
}
/*
** There isn't one; add a new one, unless there are already too
** many.
*/
if (typecnt >= TZ_MAX_TYPES) {
error("too many local time types");
exit(EXIT_FAILURE);
}
if (! (-1L - 2147483647L <= gmtoff && gmtoff <= 2147483647L)) {
error("UTC offset out of range");
exit(EXIT_FAILURE);
}
gmtoffs[i] = gmtoff;
isdsts[i] = isdst;
ttisstds[i] = ttisstd;
ttisgmts[i] = ttisgmt;
for (j = 0; j < charcnt; ++j)
if (strcmp(&chars[j], abbr) == 0)
break;
if (j == charcnt)
newabbr(abbr);
abbrinds[i] = j;
++typecnt;
return i;
}
static void
leapadd(zic_t t, int positive, int rolling, int count)
{
int i, j;
if (leapcnt + (positive ? count : 1) > TZ_MAX_LEAPS) {
error("too many leap seconds");
exit(EXIT_FAILURE);
}
for (i = 0; i < leapcnt; ++i)
if (t <= trans[i]) {
if (t == trans[i]) {
error("repeated leap second moment");
exit(EXIT_FAILURE);
}
break;
}
do {
for (j = leapcnt; j > i; --j) {
trans[j] = trans[j - 1];
corr[j] = corr[j - 1];
roll[j] = roll[j - 1];
}
trans[i] = t;
corr[i] = positive ? 1L : eitol(-count);
roll[i] = rolling;
++leapcnt;
} while (positive && --count != 0);
}
static void
adjleap(void)
{
int i;
long last = 0;
/*
** propagate leap seconds forward
*/
for (i = 0; i < leapcnt; ++i) {
trans[i] = tadd(trans[i], last);
last = corr[i] += last;
}
}
/* this function is not strncasecmp */
static int
itsabbr(const char *sabbr, const char *sword)
{
const unsigned char *abbr = sabbr;
const unsigned char *word = sword;
if (tolower(*abbr) != tolower(*word))
return FALSE;
while (*++abbr != '\0')
do {
++word;
if (*word == '\0')
return FALSE;
} while (tolower(*word) != tolower(*abbr));
return TRUE;
}
static const struct lookup *
byword(const char *word, const struct lookup *table)
{
const struct lookup *foundlp;
const struct lookup *lp;
if (word == NULL || table == NULL)
return NULL;
/*
** Look for exact match.
*/
for (lp = table; lp->l_word != NULL; ++lp)
if (strcasecmp(word, lp->l_word) == 0)
return lp;
/*
** Look for inexact match.
*/
foundlp = NULL;
for (lp = table; lp->l_word != NULL; ++lp)
if (itsabbr(word, lp->l_word)) {
if (foundlp == NULL)
foundlp = lp;
else
return NULL; /* multiple inexact matches */
}
return foundlp;
}
static char **
getfields(char *cp)
{
char *dp;
char **array;
int nsubs;
if (cp == NULL)
return NULL;
array = ereallocarray(NULL, strlen(cp) + 1, sizeof *array);
nsubs = 0;
for ( ; ; ) {
while (isascii((unsigned char)*cp) &&
isspace((unsigned char)*cp))
++cp;
if (*cp == '\0' || *cp == '#')
break;
array[nsubs++] = dp = cp;
do {
if ((*dp = *cp++) != '"') {
++dp;
} else {
while ((*dp = *cp++) != '"') {
if (*dp != '\0')
++dp;
else {
error("Odd number of quotation marks");
exit(EXIT_FAILURE);
}
}
}
} while (*cp != '\0' && *cp != '#' &&
(!isascii((unsigned char)*cp) || !isspace((unsigned char)*cp)));
if (isascii((unsigned char)*cp) && isspace((unsigned char)*cp))
++cp;
*dp = '\0';
}
array[nsubs] = NULL;
return array;
}
static long
oadd(long t1, long t2)
{
long t = t1 + t2;
if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
error("time overflow");
exit(EXIT_FAILURE);
}
return t;
}
static zic_t
tadd(zic_t t1, long t2)
{
zic_t t;
if (t1 == max_time && t2 > 0)
return max_time;
if (t1 == min_time && t2 < 0)
return min_time;
t = t1 + t2;
if ((t2 > 0 && t <= t1) || (t2 < 0 && t >= t1)) {
error("time overflow");
exit(EXIT_FAILURE);
}
return t;
}
/*
** Given a rule, and a year, compute the date - in seconds since January 1,
** 1970, 00:00 LOCAL time - in that year that the rule refers to.
*/
static zic_t
rpytime(const struct rule *rp, int wantedy)
{
int y, m, i;
long dayoff; /* with a nod to Margaret O. */
zic_t t;
if (wantedy == INT_MIN)
return min_time;
if (wantedy == INT_MAX)
return max_time;
dayoff = 0;
m = TM_JANUARY;
y = EPOCH_YEAR;
while (wantedy != y) {
if (wantedy > y) {
i = len_years[isleap(y)];
++y;
} else {
--y;
i = -len_years[isleap(y)];
}
dayoff = oadd(dayoff, eitol(i));
}
while (m != rp->r_month) {
i = len_months[isleap(y)][m];
dayoff = oadd(dayoff, eitol(i));
++m;
}
i = rp->r_dayofmonth;
if (m == TM_FEBRUARY && i == 29 && !isleap(y)) {
if (rp->r_dycode == DC_DOWLEQ)
--i;
else {
error("use of 2/29 in non leap-year");
exit(EXIT_FAILURE);
}
}
--i;
dayoff = oadd(dayoff, eitol(i));
if (rp->r_dycode == DC_DOWGEQ || rp->r_dycode == DC_DOWLEQ) {
long wday;
#define LDAYSPERWEEK ((long) DAYSPERWEEK)
wday = eitol(EPOCH_WDAY);
/*
** Don't trust mod of negative numbers.
*/
if (dayoff >= 0)
wday = (wday + dayoff) % LDAYSPERWEEK;
else {
wday -= ((-dayoff) % LDAYSPERWEEK);
if (wday < 0)
wday += LDAYSPERWEEK;
}
while (wday != eitol(rp->r_wday))
if (rp->r_dycode == DC_DOWGEQ) {
dayoff = oadd(dayoff, 1);
if (++wday >= LDAYSPERWEEK)
wday = 0;
++i;
} else {
dayoff = oadd(dayoff, -1);
if (--wday < 0)
wday = LDAYSPERWEEK - 1;
--i;
}
}
if (dayoff < min_time / SECSPERDAY)
return min_time;
if (dayoff > max_time / SECSPERDAY)
return max_time;
t = (zic_t) dayoff * SECSPERDAY;
return tadd(t, rp->r_tod);
}
static void
newabbr(const char *string)
{
int i;
if (strcmp(string, GRANDPARENTED) != 0) {
const char * cp;
char * wp;
cp = string;
wp = NULL;
while (isascii((unsigned char)*cp) &&
(isalnum((unsigned char)*cp) || *cp == '-' || *cp == '+'))
++cp;
if (noise && cp - string > 3)
wp = "time zone abbreviation has more than 3 characters";
if (cp - string > ZIC_MAX_ABBR_LEN_WO_WARN)
wp = "time zone abbreviation has too many characters";
if (*cp != '\0')
wp = "time zone abbreviation differs from POSIX standard";
if (wp != NULL) {
wp = ecpyalloc(wp);
wp = ecatalloc(wp, " (");
wp = ecatalloc(wp, string);
wp = ecatalloc(wp, ")");
warning(wp);
free(wp);
}
}
i = strlen(string) + 1;
if (charcnt + i > TZ_MAX_CHARS) {
error("too many, or too long, time zone abbreviations");
exit(EXIT_FAILURE);
}
strlcpy(&chars[charcnt], string, sizeof(chars) - charcnt);
charcnt += eitol(i);
}
static int
mkdirs(char *argname)
{
char * name;
char * cp;
if (argname == NULL || *argname == '\0')
return 0;
cp = name = ecpyalloc(argname);
while ((cp = strchr(cp + 1, '/')) != 0) {
*cp = '\0';
if (!itsdir(name)) {
/*
** It doesn't seem to exist, so we try to create it.
** Creation may fail because of the directory being
** created by some other multiprocessor, so we get
** to do extra checking.
*/
if (mkdir(name, MKDIR_UMASK) != 0) {
const char *e = strerror(errno);
if (errno != EEXIST || !itsdir(name)) {
fprintf(stderr,
"%s: Can't create directory %s: %s\n",
__progname, name, e);
free(name);
return -1;
}
}
}
*cp = '/';
}
free(name);
return 0;
}
static long
eitol(int i)
{
long l = i;
if ((i < 0 && l >= 0) || (i == 0 && l != 0) || (i > 0 && l <= 0))
errx(1, "%d did not sign extend correctly", i);
return l;
}
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